Deploy to a different place

.forgejo/workflows/aur.yml

@@ -0,0 +1,80 @@
+name: Release to AUR
+on:
+  workflow_call:
+    inputs:
+      package-name:
+        required: true
+        type: string
+      description:
+        required: true
+        type: string
+      depends:
+        required: true
+        type: string
+      flags:
+        required: true
+        type: string
+  workflow_dispatch:
+    inputs:
+      package-name:
+        description: "The name under which the package is going to be packaged to AUR"
+        type: string
+        default: "lmdbal"
+      description:
+        description: "The description of the package"
+        type: string
+        default: "LMDB Abstraction Layer"
+      depends:
+        description: "Additional dependencies"
+        type: string
+        default: ""
+      flags:
+        description: "Additional CMake flags"
+        type: string
+        default: ""
+
+jobs:
+  aur:
+    name: Releasing ${{ inputs.package-name }} to AUR
+    runs-on: archlinux
+    steps:
+      - name: Download the release tarball
+        run: curl -sL ${{ gitea.server_url }}/${{ gitea.repository }}/archive/${{ gitea.event.release.tag_name }}.tar.gz --output tarball.tar.gz
+
+      - name: Calculate SHA256 for the tarball
+        run: echo "tbSum=$(sha256sum tarball.tar.gz | cut -d ' ' -f 1)" >> $GITHUB_ENV
+
+      - name: Unarchive tarball
+        run: tar -xvzf tarball.tar.gz
+
+      - name: Clone the AUR repository
+        run: |
+          echo "${{ secrets.DEPLOY_TO_AUR_PRIVATE_KEY }}" > key
+          chmod 600 key
+          GIT_SSH_COMMAND="ssh -i key -o 'IdentitiesOnly yes' -o 'StrictHostKeyChecking no'" git clone ssh://aur@aur.archlinux.org/${{ inputs.package-name }}.git aur
+          chmod 777 -R aur
+          cd aur
+          git config user.name ${{ secrets.DEPLOY_TO_AUR_USER_NAME }}
+          git config user.email ${{ secrets.DEPLOY_TO_AUR_EMAIL }}
+          git checkout -b master || git checkout master
+
+      - name: Copy PKGBUILD to the directory
+        run: cp lmdbal/packaging/Archlinux/PKGBUILD aur/
+
+      - name: Patch PKGBUILD file, and generate .SRCINFO
+        working-directory: aur
+        run: |
+          sed -i "/sha256sums=/c\sha256sums=('${{ env.tbSum }}')" PKGBUILD
+          sed -i "/pkgname=lmdbal/c\pkgname=${{ inputs.package-name }}" PKGBUILD
+          sed -i "/pkgver=1.0.0/c\pkgver=${{ gitea.event.release.tag_name }}" PKGBUILD
+          sed -i "/pkgdesc=\"LMDB Abstraction Layer\"/c\pkgdesc=\"${{ inputs.description }}\"" PKGBUILD
+          sed -i "/depends=( 'lmdb' )/c\depends=( 'lmdb' ${{ inputs.depends }} )" PKGBUILD
+          sed -i '/cmake . -D/s/$/ ${{ inputs.flags }}/' PKGBUILD
+          sudo -u build makepkg --printsrcinfo > .SRCINFO
+
+      - name: Commit package to aur
+        working-directory: aur
+        run: |
+          git add PKGBUILD .SRCINFO
+          git commit -m "${{ gitea.event.release.body }}"
+          GIT_SSH_COMMAND="ssh -i ../key -o 'IdentitiesOnly yes' -o 'StrictHostKeyChecking no'" git push origin master

.forgejo/workflows/main.yml

@@ -0,0 +1,66 @@
+name: Main LMDBAL workflow
+run-name: ${{ gitea.actor }} is running LMDBAL main workflow
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  test-qt5:
+    name: Test LMDBAL with qt5
+    uses: ./.forgejo/workflows/test.yml
+    runs-on: archlinux
+    with:
+      flags: -D QT_VERSION_MAJOR=5 -D LMDBAL_NAME=LMDBAL-QT5
+
+  test-qt6:
+    name: Test LMDBAL with qt6
+    uses: ./.forgejo/workflows/test.yml
+    runs-on: archlinux
+    with:
+      flags: -D QT_VERSION_MAJOR=6 -D LMDBAL_NAME=LMDBAL-QT6
+
+  build-documentation:
+    name: Builds documentation
+    runs-on: archlinux
+    needs: [test-qt5, test-qt6]
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+
+      - name: Make a build directory
+        run: mkdir build
+
+      - name: Configure
+        working-directory: ./build
+        run: cmake .. LMDBAL_BUILD_DOC_HTML=True -D LMDBAL_BUILD_DOC_XML=True -D LMDBAL_BUILD_DOC_MAN=True -D LMDBAL_BUILD_DOXYGEN_AWESOME=True
+
+      - name: Build
+        working-directory: ./build
+        run: cmake --build .
+
+      - name: Upload docs
+        uses: actions/upload-artifact@v3
+        with:
+          name: lmdbal-doc
+          path: build/doc
+          retention-days: 1
+
+  deploy-doc:
+    name: Deploys documentation
+    runs-on: bm_site
+    needs: [build-documentation]
+    steps:
+      - name: Download docs
+        uses: actions/download-artifact@v3
+        with:
+          name: lmdbal-doc
+          path: build/doc
+
+      - name: Make sure deploy folder exists
+        run: mkdir -p /srv/http/doc/lmdbal
+
+      - name: Deploy docs
+        run: |
+          rm -rf /srv/http/doc/lmdbal/*
+          cp -r build/doc/html/* /srv/http/doc/lmdbal/

.forgejo/workflows/release.yml

@@ -0,0 +1,33 @@
+name: LMDBAL Release workflow
+run-name: ${{ gitea.actor }} is running LMDBAL Release workflow on release ${{ gitea.event.release.tag_name }}
+on:
+  release:
+    types: [published]
+
+jobs:
+  qt5:
+    name: Release qt5 build to AUR
+    uses: ./.forgejo/workflows/aur.yml
+    with:
+      package-name: lmdbal-qt5
+      description: LMDB Abstraction Layer, qt5 version
+      depends: 'qt5-base'
+      flags: -D QT_VERSION_MAJOR=5 -D LMDBAL_NAME=LMDBALQT5
+    secrets:
+      DEPLOY_TO_AUR_PRIVATE_KEY: ${{ secrets.DEPLOY_TO_AUR_PRIVATE_KEY }}
+      DEPLOY_TO_AUR_USER_NAME: ${{ secrets.DEPLOY_TO_AUR_USER_NAME }}
+      DEPLOY_TO_AUR_EMAIL: ${{ secrets.DEPLOY_TO_AUR_EMAIL }}
+
+  qt6:
+    name: Release qt6 build to AUR
+    uses: ./.forgejo/workflows/aur.yml
+    with:
+      package-name: lmdbal-qt6
+      description: LMDB Abstraction Layer, qt6 version
+      depends: 'qt6-base'
+      flags: -D QT_VERSION_MAJOR=6 -D LMDBAL_NAME=LMDBALQT6
+    secrets:
+      DEPLOY_TO_AUR_PRIVATE_KEY: ${{ secrets.DEPLOY_TO_AUR_PRIVATE_KEY }}
+      DEPLOY_TO_AUR_USER_NAME: ${{ secrets.DEPLOY_TO_AUR_USER_NAME }}
+      DEPLOY_TO_AUR_EMAIL: ${{ secrets.DEPLOY_TO_AUR_EMAIL }}
+

.forgejo/workflows/test.yml

@@ -0,0 +1,39 @@
+name: Build and run unit tests for LMDBAL
+on:
+  workflow_call:
+    inputs:
+      flags:
+        required: true
+        type: string
+
+    secrets:
+
+  workflow_dispatch:
+    inputs:
+      flags:
+        description: "Flags for CMake configure stage"
+        type: string
+        default: "lmdbal"
+
+jobs:
+  test:
+    name: Building and running unit tests
+    runs-on: archlinux
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+
+      - name: Make a build directory
+        run: mkdir build
+
+      - name: Configure
+        working-directory: ./build
+        run: cmake .. -D LMDBAL_STRICT=True -D LMDBAL_BUILD_TESTS=True ${{ inputs.flags }}
+
+      - name: Build
+        working-directory: ./build
+        run: cmake --build .
+
+      - name: Run tests
+        working-directory: ./build/test
+        run: ./runUnitTests

.gitea/workflows/main.yml

@@ -1,39 +0,0 @@
-name: Main LMDBAL workfow
-run-name: ${{ gitea.actor }} is running LMDBAL main workflow
-on:
-  push:
-    branches:
-      - master
-
-jobs:
-  Archlinux:
-    runs-on: archlinux
-    steps:
-      - name: Check out repository code
-        uses: actions/checkout@v3
-
-      - name: Make a build directory
-        run: mkdir build
-
-      - name: Configure
-        working-directory: ./build
-        run: cmake .. -D BUILD_TESTS=True -D BUILD_DOC_HTML=True -D BUILD_DOC_XML=True -D BUILD_DOC_MAN=True -D BUILD_DOXYGEN_AWESOME=True -D QT_VERSION_MAJOR=5
-
-      - name: Build
-        working-directory: ./build
-        run: cmake --build .
-
-      - name: Run tests
-        working-directory: ./build/test
-        run: ./runUnitTests
-
-      - name: Copy docs via scp
-        uses: appleboy/scp-action@master
-        # working-directory: ./build/doc    //doesn't work
-        with:
-          host: ${{ secrets.DOMAIN_ROOT }}
-          username: ${{ secrets.DEPLOY_USER_NAME }}
-          key: ${{ secrets.DEPLOY_PRIVATE_KEY }}
-          source: "build/doc/html/*,build/doc/xml/*,build/doc/man/*"
-          target: "/srv/lmdbal/doc"
-          strip_components: 2

.gitea/workflows/release.yml

@@ -1,46 +0,0 @@
-name: LMDBAL Release workflow
-run-name: ${{ gitea.actor }} is running LMDBAL Release workflow on release ${{ gitea.event.release.tag_name }}
-on:
-  release:
-    types: [published]
-
-jobs:
-  Archlinux:
-    runs-on: archlinux
-    steps:
-      - name: Download the release tarball
-        run: curl -sL ${{ gitea.server_url }}/${{ gitea.repository }}/archive/${{ gitea.event.release.tag_name }}.tar.gz --output tarball.tar.gz
-
-      - name: Calculate SHA256 for the tarball
-        run: echo "tbSum=$(sha256sum tarball.tar.gz | cut -d ' ' -f 1)" >> $GITHUB_ENV
-
-      - name: Unarchive tarball
-        run: tar -xvzf tarball.tar.gz
-
-      - name: Clone the AUR repository
-        run: |
-          echo "${{ secrets.DEPLOY_TO_AUR_PRIVATE_KEY }}" > key
-          chmod 600 key
-          GIT_SSH_COMMAND="ssh -i key -o 'IdentitiesOnly yes' -o 'StrictHostKeyChecking no'" git clone ssh://aur@aur.archlinux.org/lmdbal.git aur
-          chmod 777 -R aur
-          cd aur
-          git config user.name ${{ secrets.DEPLOY_TO_AUR_USER_NAME }}
-          git config user.email ${{ secrets.DEPLOY_TO_AUR_EMAIL }}
-
-
-      - name: Copy PKGBUILD to the directory
-        run: cp lmdbal/packaging/Archlinux/PKGBUILD aur/
-
-      - name: Put SHA256 sum to PKGBUILD file, and generate .SRCINFO
-        working-directory: aur
-        run: |
-          sed -i "/sha256sums=/c\sha256sums=('${{ env.tbSum }}')" PKGBUILD
-          sudo -u build makepkg --printsrcinfo > .SRCINFO
-
-      - name: Commit package to aur
-        working-directory: aur
-        run: |
-          git add PKGBUILD .SRCINFO
-          git commit -m "${{ gitea.event.release.body }}"
-          GIT_SSH_COMMAND="ssh -i ../key -o 'IdentitiesOnly yes' -o 'StrictHostKeyChecking no'" git push
-

CHANGELOG.md

@@ -1,5 +1,22 @@
 # Changelog
 
+# LMDBAL 0.6.0 (UNRELEASED)
+### Improvements
+- Less dereferencing
+- Transactions are now closed with the database
+- Cursors are now closed if the public transaction that opened them got closed
+- New primitive to manage database state - session
+- Stricter warnings
+- Sanitizer builds
+
+### Bug fixes
+- SIGSEGV on closing database with opened transactions
+
+# LMDBAL 0.5.4 (November 30, 2024)
+### Improvements
+- Technical release just to resolve build issues
+- Now different flavours of the package can coexist in the system
+
 # LMDBAL 0.5.3 (November 14, 2023)
 ### Improvements
 - Now you don't need to link agains lmdb, just linking against LMDBAL is enough

CMakeLists.txt

@@ -1,21 +1,26 @@
 cmake_minimum_required(VERSION 3.16)
 
 project(LMDBAL
-  VERSION 0.5.4
-  DESCRIPTION "LMDB (Lightning Memory-Mapped Database Manager) Abstraction Layer"
-  LANGUAGES CXX
+        VERSION 0.6.0
+        DESCRIPTION "LMDB (Lightning Memory-Mapped Database Manager) Abstraction Layer"
+        LANGUAGES CXX
 )
-string(TOLOWER ${PROJECT_NAME} PROJECT_LOW)
 
 cmake_policy(SET CMP0076 NEW)
 cmake_policy(SET CMP0079 NEW)
 
-option(BUILD_STATIC "Builds library as static library" OFF)
-option(BUILD_TESTS "Builds tests" OFF)
-option(BUILD_DOC_MAN "Builds man page documentation" OFF)
-option(BUILD_DOC_HTML "Builds html documentation" OFF)
-option(BUILD_DOC_XML "Builds xml documentation" OFF)
-option(BUILD_DOXYGEN_AWESOME "Builds documentation alternative style" OFF)
+set(LMDBAL_NAME ${PROJECT_NAME} CACHE STRING "Override for library name and install path")
+
+option(LMDBAL_BUILD_STATIC "Builds library as static library" OFF)
+option(LMDBAL_BUILD_TESTS "Builds tests" OFF)
+option(LMDBAL_BUILD_DOC_MAN "Builds man page documentation" OFF)
+option(LMDBAL_BUILD_DOC_HTML "Builds html documentation" OFF)
+option(LMDBAL_BUILD_DOC_XML "Builds xml documentation" OFF)
+option(LMDBAL_BUILD_DOXYGEN_AWESOME "Builds documentation alternative style" OFF)
+option(LMDBAL_STRICT "Builds with extra compiler warnings" OFF)
+option(LMDBAL_ASAN "Enables Address Sanitizer" OFF)
+option(LMDBAL_UBSAN "Enables Undefined Behavior Sanitizer" OFF)
+option(LMDBAL_TSAN "Enables Thread Sanitizer" OFF)
 
 include(GNUInstallDirs)
 include(CMakePackageConfigHelpers)
@@ -25,106 +30,148 @@ set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 
+string(TOLOWER ${LMDBAL_NAME} LMDBAL_NAME_LOW)
+
 if (NOT DEFINED QT_VERSION_MAJOR)
-  find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Core)
-endif()
+    find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Core)
+endif ()
 find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Core)
 
 find_package(LMDB REQUIRED)
 
 # Build type
 if (NOT CMAKE_BUILD_TYPE)
-  set(CMAKE_BUILD_TYPE Debug)
+    set(CMAKE_BUILD_TYPE Debug)
 endif ()
 
-if (BUILD_STATIC)
-  add_library(${PROJECT_NAME} STATIC)
+if (LMDBAL_BUILD_STATIC)
+    add_library(${LMDBAL_NAME} STATIC)
 else ()
-  add_library(${PROJECT_NAME} SHARED)
+    add_library(${LMDBAL_NAME} SHARED)
 endif()
 
-if (CMAKE_BUILD_TYPE STREQUAL "Release")
-  list(APPEND COMPILE_OPTIONS -O3)
-elseif (CMAKE_BUILD_TYPE STREQUAL "Debug")
-  list(APPEND COMPILE_OPTIONS -g)
-  list(APPEND COMPILE_OPTIONS -Wall)
-  list(APPEND COMPILE_OPTIONS -Wextra)
-endif()
+
+if (CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
+    list(APPEND COMPILE_OPTIONS -Wall)
+    list(APPEND COMPILE_OPTIONS -Wextra)
+    list(APPEND COMPILE_OPTIONS -Wpedantic)
+
+    if (CMAKE_BUILD_TYPE STREQUAL "Release")
+        list(APPEND COMPILE_OPTIONS -O3)
+        list(APPEND COMPILE_OPTIONS -DNDEBUG)
+    elseif (CMAKE_BUILD_TYPE STREQUAL "Debug")
+        list(APPEND COMPILE_OPTIONS -O0)
+        list(APPEND COMPILE_OPTIONS -g3)
+        list(APPEND COMPILE_OPTIONS -ggdb)
+    endif ()
+
+    if (LMDBAL_STRICT)
+        list(APPEND COMPILE_OPTIONS -Wall)
+        list(APPEND COMPILE_OPTIONS -Werror)
+        list(APPEND COMPILE_OPTIONS -Wconversion)
+        list(APPEND COMPILE_OPTIONS -Wnon-virtual-dtor)
+        list(APPEND COMPILE_OPTIONS -Wold-style-cast)
+        list(APPEND COMPILE_OPTIONS -Wcast-align)
+        list(APPEND COMPILE_OPTIONS -Wunused)
+        list(APPEND COMPILE_OPTIONS -Woverloaded-virtual)
+        list(APPEND COMPILE_OPTIONS -Wsign-conversion)
+        list(APPEND COMPILE_OPTIONS -Wnull-dereference)
+    endif ()
+
+    if(JAY_ENABLE_ASAN)
+        list(APPEND COMPILE_OPTIONS -fsanitize=address)
+        list(APPEND COMPILE_OPTIONS -fno-omit-frame-pointer)
+        list(APPEND LINK_OPTIONS -fsanitize=address)
+        add_link_options()
+    endif()
+
+    if(JAY_ENABLE_UBSAN)
+        list(APPEND COMPILE_OPTIONS -fsanitize=undefined)
+        list(APPEND LINK_OPTIONS -fsanitize=undefined)
+    endif()
+
+    if(JAY_ENABLE_TSAN)
+        list(APPEND COMPILE_OPTIONS -fsanitize=thread)
+        list(APPEND LINK_OPTIONS -fsanitize=thread)
+    endif()
+endif ()
 
 message("Compilation options: " ${COMPILE_OPTIONS})
-target_compile_options(${PROJECT_NAME} PRIVATE ${COMPILE_OPTIONS})
+message("Linking options: " ${LINK_OPTIONS})
+target_compile_options(${LMDBAL_NAME} PRIVATE ${COMPILE_OPTIONS})
+target_link_options(${LMDBAL_NAME} PRIVATE ${LINK_OPTIONS})
 
-set_property(TARGET ${PROJECT_NAME} PROPERTY VERSION ${version})
-set_property(TARGET ${PROJECT_NAME} PROPERTY SOVERSION 1)
-set_property(TARGET ${PROJECT_NAME} PROPERTY EXPORT_NAME ${PROJECT_NAME})
-set_property(TARGET ${PROJECT_NAME} PROPERTY INTERFACE_${PROJECT_NAME}_MAJOR_VERSION 1)
-set_property(TARGET ${PROJECT_NAME} APPEND PROPERTY
-  COMPATIBLE_INTERFACE_STRING ${PROJECT_NAME}_MAJOR_VERSION
+set_property(TARGET ${LMDBAL_NAME} PROPERTY VERSION ${version})
+set_property(TARGET ${LMDBAL_NAME} PROPERTY SOVERSION 1)
+set_property(TARGET ${LMDBAL_NAME} PROPERTY EXPORT_NAME ${LMDBAL_NAME})
+set_property(TARGET ${LMDBAL_NAME} PROPERTY INTERFACE_${LMDBAL_NAME}_MAJOR_VERSION 1)
+set_property(TARGET ${LMDBAL_NAME} APPEND PROPERTY
+    COMPATIBLE_INTERFACE_STRING ${LMDBAL_NAME}_MAJOR_VERSION
 )
 
 if (UNIX)
-    set_property(TARGET ${PROJECT_NAME} PROPERTY INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}/${PROJECT_LOW}")
-    set_property(TARGET ${PROJECT_NAME} PROPERTY INSTALL_RPATH_USE_LINK_PATH TRUE)
-    set_property(TARGET ${PROJECT_NAME} PROPERTY SKIP_BUILD_RPATH FALSE)
-    set_property(TARGET ${PROJECT_NAME} PROPERTY BUILD_WITH_INSTALL_RPATH FALSE)
-endif()
+    set_property(TARGET ${LMDBAL_NAME} PROPERTY INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}/${LMDBAL_NAME_LOW}")
+    set_property(TARGET ${LMDBAL_NAME} PROPERTY INSTALL_RPATH_USE_LINK_PATH TRUE)
+    set_property(TARGET ${LMDBAL_NAME} PROPERTY SKIP_BUILD_RPATH FALSE)
+    set_property(TARGET ${LMDBAL_NAME} PROPERTY BUILD_WITH_INSTALL_RPATH FALSE)
+endif ()
 
 add_subdirectory(src)
-if (BUILD_DOC_MAN OR BUILD_DOC_HTML OR BUILD_DOC_XML)
-  find_package(Doxygen)
-  if (DOXYGEN_FOUND)
-    add_subdirectory(doc)
-  else()
-    message("Was trying to build documentation, but Doxygen was not found, skipping documentation")
-  endif()
-endif()
+if (LMDBAL_BUILD_DOC_MAN OR LMDBAL_BUILD_DOC_HTML OR LMDBAL_BUILD_DOC_XML)
+    find_package(Doxygen)
+    if (DOXYGEN_FOUND)
+        add_subdirectory(doc)
+    else ()
+        message("Was trying to build documentation, but Doxygen was not found, skipping documentation")
+    endif ()
+endif ()
 
-if (BUILD_TESTS)
-  add_subdirectory(test)
+if (LMDBAL_BUILD_TESTS)
+    add_subdirectory(test)
 endif ()
 
 target_include_directories(
-  ${PROJECT_NAME}
-  PUBLIC
-  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/${PROJECT_LOW}>
-  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>
-  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src/serializer>
+    ${LMDBAL_NAME}
+    PUBLIC
+    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/${LMDBAL_NAME_LOW}>
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src/serializer>
 )
-target_include_directories(${PROJECT_NAME} PRIVATE ${Qt${QT_VERSION_MAJOR}_INCLUDE_DIRS})
-target_include_directories(${PROJECT_NAME} PRIVATE ${Qt${QT_VERSION_MAJOR}Core_INCLUDE_DIRS})
+target_include_directories(${LMDBAL_NAME} PRIVATE ${Qt${QT_VERSION_MAJOR}_INCLUDE_DIRS})
+target_include_directories(${LMDBAL_NAME} PRIVATE ${Qt${QT_VERSION_MAJOR}Core_INCLUDE_DIRS})
 
 target_link_libraries(
-  ${PROJECT_NAME}
-  Qt${QT_VERSION_MAJOR}::Core
-  lmdb
+    ${LMDBAL_NAME}
+    Qt${QT_VERSION_MAJOR}::Core
+    lmdb
 )
 
 configure_package_config_file(
     ${CMAKE_CURRENT_SOURCE_DIR}/cmake/Config.cmake.in
-    "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_LOW}Config.cmake"
-    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_LOW}
+    "${CMAKE_CURRENT_BINARY_DIR}/${LMDBAL_NAME_LOW}Config.cmake"
+    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${LMDBAL_NAME_LOW}
 )
 
 write_basic_package_version_file(
-    "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_LOW}ConfigVersion.cmake"
+    "${CMAKE_CURRENT_BINARY_DIR}/${LMDBAL_NAME_LOW}ConfigVersion.cmake"
     VERSION "${version}"
     COMPATIBILITY AnyNewerVersion
 )
 
-install(TARGETS ${PROJECT_NAME}
-        EXPORT ${PROJECT_LOW}Targets
+install(TARGETS ${LMDBAL_NAME}
+        EXPORT ${LMDBAL_NAME_LOW}Targets
         LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-        INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${PROJECT_LOW}
+        INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${LMDBAL_NAME_LOW}
 )
 
-install(EXPORT ${PROJECT_LOW}Targets
-        FILE ${PROJECT_LOW}Targets.cmake
-        NAMESPACE ${PROJECT_NAME}::
-        DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_LOW}
+install(EXPORT ${LMDBAL_NAME_LOW}Targets
+        FILE ${LMDBAL_NAME_LOW}Targets.cmake
+        NAMESPACE ${LMDBAL_NAME}::
+        DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${LMDBAL_NAME_LOW}
 )
 
 install(FILES
-          "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_LOW}Config.cmake"
-          "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_LOW}ConfigVersion.cmake"
-        DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_LOW}
+        "${CMAKE_CURRENT_BINARY_DIR}/${LMDBAL_NAME_LOW}Config.cmake"
+        "${CMAKE_CURRENT_BINARY_DIR}/${LMDBAL_NAME_LOW}ConfigVersion.cmake"
+        DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${LMDBAL_NAME_LOW}
 )

README.md

@@ -1,14 +1,15 @@
 # LMDBAL - Lightning Memory Data Base Abstraction Level
 
 [![AUR license](https://img.shields.io/aur/license/lmdbal?style=flat-square)](https://git.macaw.me/blue/lmdbal/raw/branch/master/LICENSE.md)
-[![AUR version](https://img.shields.io/aur/version/lmdbal?style=flat-square)](https://aur.archlinux.org/packages/lmdbal/)
+[![AUR qt5 version](https://img.shields.io/aur/version/lmdbal-qt5?style=flat-square&label=lmdbal-qt5)](https://aur.archlinux.org/packages/lmdbal-qt5/)
+[![AUR qt6 version](https://img.shields.io/aur/version/lmdbal-qt6?style=flat-square&label=lmdbal-qt6)](https://aur.archlinux.org/packages/lmdbal-qt6/)
 [![Liberapay patrons](https://img.shields.io/liberapay/patrons/macaw.me?logo=liberapay&style=flat-square)](https://liberapay.com/macaw.me)
 [![Documentation](https://img.shields.io/badge/Documentation-HTML-green)](https://macaw.me/lmdbal/doc/html)
 
 ### Prerequisites
 
-- a compiler (c++ would do)
-- Qt 5 or higher (qt5-base would do)
+- a c++ compiler (g++ would do)
+- Qt 5 or 6 or higher (qt5-base or qt6-base would do)
 - lmdb
 - CMake 3.16 or higher
 - Doxygen (optional, for documentation)
@@ -18,7 +19,8 @@
 
 #### As a system library
 
-If you're using LMDBAL as a system library you probably have no control over it's build options. The easiest way to include the project is to add following
+If you're using LMDBAL as a system library, you probably have no control over its build options. 
+The easiest way to include the project is to add the following
 
 ```
 find_package(lmdbal)
@@ -28,14 +30,14 @@ if (LMDBAL_FOUND)
 endif()
 ```
 
-#### As an embeded subproject
+#### As an embedded subproject
 
-If you're using LMDBAL as a embeded library you might want to control it's build options, for example you can run
+If you're using LMDBAL as a embedded library, you might want to control its build options, for example, you can run
 ```
-set(BUILD_STATIC ON)
+set(LMDBAL_BUILD_STATIC ON)
 ```
 
-before including the library in your project. This will set the library to be build in a static mode.
+... before including the library in your project. This will set the library to be build in a static mode.
 
 Then you want to run something like this
 ```
@@ -66,9 +68,11 @@ $ cmake --build .
 $ cmake --install . --prefix install
 ```
 
-This way will create you a `lmdbal/build` directory with temporary files, and `lmdbal/build/install` with all the export files for installation to the system.
+This way will create you a `lmdbal/build` directory with temporary files, and `lmdbal/build/install` 
+with all the export files for installation to the system.
 
-After `cmake ..` you can specify keys to alter the building process. In this context building keys are transfered like so
+After `cmake ..` you can specify keys to alter the building process. 
+In this context building keys are transferred like so
 
 ```
 cmake .. -D KEY1=VALUE1 -D KEY2=VALUE2 ...
@@ -79,21 +83,26 @@ cmake .. -D KEY1=VALUE1 -D KEY2=VALUE2 ...
 Here is the list of keys you can pass to configuration phase of `cmake ..`:
 
 - `CMAKE_BUILD_TYPE` - `Debug` just builds showing all warnings, `Release` builds with no warnings and applies optimizations (default is `Debug`);
-- `BUILD_STATIC` - `True` builds project as a static library, `False` builds as dynamic (default is `False`);
-- `BUILD_TESTS` - `True` build unit tests, `False` does not (default is `False`);
+- `LMDBAL_BUILD_STATIC` - `True` builds project as a static library, `False` builds as dynamic (default is `False`);
+- `LMDBAL_BUILD_TESTS` - `True` build unit tests, `False` does not (default is `False`);
 - `BUILD_DOC` - `True` build doxygen documentation, `False` does not (default is `False`);
-- `BUILD_DOXYGEN_AWESOME` - `True` build doxygen awesome theme if `BUILD_DOC` is also `True` (default is `False`);
-- `QT_VERSION_MAJOR` - `5` links against Qt5, `6` links agains Qt6, there is no default, so, if you didn't specify it the project will chose automatically;
+- `LMDBAL_BUILD_DOXYGEN_AWESOME` - `True` build doxygen awesome theme if `BUILD_DOC` is also `True` (default is `False`);
+- `QT_VERSION_MAJOR` - `5` links against Qt5, `6` links against Qt6, there is no default, so, if you didn't specify it, the project will choose automatically;
+- `LMDBAL_NAME` - `LMDBAL` builds the main target with this name, also the installation path will be this name lowercase, useful if you want to build `LMDBAL-QT6` not to conflict with `LMDBAL-QT5`;
+- `LMDBAL_STRICT` - `True` builds with extra warnings and considers them errors (default is `False`);
+- `LMDBAL_ASAN` - `True` builds with address sanitizer (default is `False`);
+- `LMDBAL_TSAN` - `True` builds with thread sanitizer (default is `False`);
+- `LMDBAL_UBSAN` - `True` builds with undefined behavior sanitizer (default is `False`);
 
 #### Running tests
 
-If you built the library with `-D BUILD_TESTS=True`, then there will be `lmdbal/build/tests/runUnitTests` executable file. You can simply run it as
+If you built the library with `-D LMDBAL_BUILD_TESTS=True`, then there will be `lmdbal/build/tests/runUnitTests` executable file. You can run it as
 
 ```
 ./runUnitTests
 ```
 
-if you're in the same directory with it
+... if you're in the same directory with it
 
 ## License
 

cmake/Config.cmake.in

@@ -1,5 +1,5 @@
 @PACKAGE_INIT@
 
-include("${CMAKE_CURRENT_LIST_DIR}/lmdbalTargets.cmake")
+include("${CMAKE_CURRENT_LIST_DIR}/@LMDBAL_NAME_LOW@Targets.cmake")
 
-check_required_components(lmdbal)
+check_required_components(@LMDBAL_NAME_LOW@)

doc/CMakeLists.txt

@@ -1,14 +1,14 @@
-if (BUILD_DOC_HTML)
+if (LMDBAL_BUILD_DOC_HTML)
     set(DOXYGEN_GENERATE_HTML YES)
 endif()
-if (BUILD_DOC_MAN)
+if (LMDBAL_BUILD_DOC_MAN)
     set(DOXYGEN_GENERATE_MAN YES)
 endif()
-if (BUILD_DOC_XML)
+if (LMDBAL_BUILD_DOC_XML)
     set(DOXYGEN_GENERATE_XML YES)
 endif()
 
-if (BUILD_DOXYGEN_AWESOME)
+if (LMDBAL_BUILD_DOXYGEN_AWESOME)
     include(ExternalProject)
     ExternalProject_Add(doxygen-awesome-css
     GIT_REPOSITORY https://github.com/jothepro/doxygen-awesome-css.git
@@ -42,25 +42,25 @@ doxygen_add_docs(
     ALL
     COMMENT "Generate man and html pages"
 )
-if (BUILD_DOC_MAN)
+if (LMDBAL_BUILD_DOC_MAN)
     install(DIRECTORY
     ${CMAKE_CURRENT_BINARY_DIR}/man
     TYPE DOC
 )
 endif()
-if (BUILD_DOC_HTML)
+if (LMDBAL_BUILD_DOC_HTML)
 install(DIRECTORY
     ${CMAKE_CURRENT_BINARY_DIR}/html
     TYPE DOC
 )
 endif()
-if (BUILD_DOC_XML)
+if (LMDBAL_BUILD_DOC_XML)
 install(DIRECTORY
     ${CMAKE_CURRENT_BINARY_DIR}/xml
     TYPE DOC
 )
 endif()
 
-if (BUILD_DOXYGEN_AWESOME)
+if (LMDBAL_BUILD_DOXYGEN_AWESOME)
     add_dependencies(documentation doxygen-awesome-css)
 endif()

packaging/Archlinux/PKGBUILD

@@ -1,23 +1,23 @@
 # Maintainer: Yury Gubich <blue@macaw.me>
 pkgname=lmdbal
-pkgver=0.5.4
-pkgrel=1
-pkgdesc="LMDB Abstraction Layer, qt5 version"
+pkgver=1.0.0
+pkgrel=4
+pkgdesc="LMDB Abstraction Layer"
 arch=('i686' 'x86_64')
 url="https://git.macaw.me/blue/lmdbal"
 license=('GPL3')
-depends=( 'lmdb' 'qt5-base')
+depends=( 'lmdb' )
 makedepends=('cmake>=3.16' 'gcc')
 optdepends=()
 
-source=("$pkgname-$pkgver.tar.gz::https://git.macaw.me/blue/$pkgname/archive/$pkgver.tar.gz")
+source=("lmdbal-$pkgver-$pkgrel.tar.gz::https://git.macaw.me/blue/lmdbal/archive/$pkgver.tar.gz")
 sha256sums=('SKIP')
 build() {
-        cd "$srcdir/$pkgname"
-        cmake . -D CMAKE_INSTALL_PREFIX=/usr -D CMAKE_BUILD_TYPE=Release -D QT_VERSION_MAJOR=5
+        cd "$srcdir/lmdbal"
+        cmake . -D CMAKE_INSTALL_PREFIX=/usr -D CMAKE_BUILD_TYPE=Release
         cmake --build .
 }
 package() {
-        cd "$srcdir/$pkgname"
+        cd "$srcdir/lmdbal"
         DESTDIR="$pkgdir/" cmake --install .
 }

src/CMakeLists.txt

@@ -1,8 +1,10 @@
 set(SOURCES
     exceptions.cpp
-    storage.cpp
+    storagecommon.cpp
     base.cpp
     transaction.cpp
+    cursorcommon.cpp
+    session.cpp
 )
 
 set(HEADERS
@@ -10,16 +12,20 @@ set(HEADERS
   exceptions.h
   storage.h
   storage.hpp
+  storagecommon.h
+  storagecommon.hpp
   cursor.h
   cursor.hpp
+  cursorcommon.h
   cache.h
   cache.hpp
   operators.hpp
   transaction.h
+  session.h
 )
 
-target_sources(${PROJECT_NAME} PRIVATE ${SOURCES})
+target_sources(${LMDBAL_NAME} PRIVATE ${SOURCES})
 
 add_subdirectory(serializer)
 
-install(FILES ${HEADERS} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${PROJECT_LOW})
+install(FILES ${HEADERS} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${LMDBAL_NAME_LOW})

src/base.cpp

@@ -18,8 +18,10 @@
 
 #include "base.h"
 #include "exceptions.h"
+#include "session.h"
 #include "storage.h"
 #include "transaction.h"
+#include "session.h"
 
 #define UNUSED(x) (void)(x)
 
@@ -28,97 +30,55 @@
  * \brief Database abstraction
  *
  * This is a basic class that represents the database as a collection of storages.
- * Storages is something key-value database has instead of tables in classic SQL databases.
+ * Storages are something that key-value databases have instead of tables in classic SQL databases.
  */
 
 /**
  * \brief Creates the database
  *
- * \param[in] _name      -   name of the database, it is going to affect folder name that is created to store data
+ * \param[in] _name      -   name of the database, it is going to affect the folder name that is created to store data
  * \param[in] _mapSize   -   LMDB map size (MiB), multiplied by 1024^2 and passed to <a class="el" href="http://www.lmdb.tech/doc/group__mdb.html#gaa2506ec8dab3d969b0e609cd82e619e5">mdb_env_set_mapsize</a> during the call of LMDBAL::Base::open()
  */
 LMDBAL::Base::Base(const QString& _name, uint16_t _mapSize):
     name(_name.toStdString()),
-    opened(false),
+    sessions(),
     size(_mapSize),
     environment(),
     storages(),
-    transactions(new Transactions())
+    transactions(),
+    mutex()
 {}
 
 /**
  * \brief Destroys the database
  */
 LMDBAL::Base::~Base() {
-    close();
+    std::lock_guard lock(mutex);
 
-    delete transactions;
+    for (Session* session : sessions)
+        session->terminate();
 
-    for (const std::pair<const std::string, iStorage*>& pair : storages)
+    if (opened())
+        deactivate();
+
+    for (const std::pair<const std::string, StorageCommon*>& pair : storages)
         delete pair.second;
 }
 
-/**
- * \brief Closes the database
- *
- * Closes all lmdb handles, aborts all public transactions.
- * This function will do nothing on closed database
- *
- * \exception LMDBAL::Unknown   - thrown if something went wrong aborting transactions
- */
-void LMDBAL::Base::close() {
-    if (opened) {
-        for (const LMDBAL::TransactionID id : *transactions)
-            abortTransaction(id, emptyName);
-
-        for (const std::pair<const std::string, iStorage*>& pair : storages)
-            pair.second->close();
-
-        mdb_env_close(environment);
-        transactions->clear();
-        opened = false;
-    }
+LMDBAL::Session LMDBAL::Base::open() {
+    return {this};
 }
 
-/**
- * \brief Opens the database
- *
- * Almost every LMDBAL::Base require it to be opened, this function does it.
- * It laso creates the directory for the database if it was an initial launch.
- * This function will do nothing on opened database
- *
- * \exception LMDBAL::Unknown - thrown if something went wrong opening storages and caches
- */
-void LMDBAL::Base::open() {
-    if (!opened) {
-        mdb_env_create(&environment);
-        QString path = createDirectory();
-
-        mdb_env_set_maxdbs(environment, storages.size());
-        mdb_env_set_mapsize(environment, size * 1024UL * 1024UL);
-        mdb_env_open(environment, path.toStdString().c_str(), 0, 0664);
-
-        TransactionID txn = beginPrivateTransaction(emptyName);
-        for (const std::pair<const std::string, iStorage*>& pair : storages) {
-            iStorage* storage = pair.second;
-            int rc = storage->open(txn);
-            if (rc)
-                throw Unknown(name, mdb_strerror(rc));
-        }
-        commitPrivateTransaction(txn, emptyName);
-        opened = true;
-    }
-}
 
 /**
  * \brief Removes database directory
  *
- * \returns true if removal was successfull of if no directory was created where it's expected to be, false otherwise
+ * \returns true if removal was successful of if no directory was created where it's expected to be, false otherwise
  *
- * \exception LMDBAL::Opened   - thrown if this function was called on opened database
+ * \exception LMDBAL::Opened   - thrown if this function was called on an opened database
  */
 bool LMDBAL::Base::removeDirectory() {
-    if (opened)
+    if (opened())
         throw Opened(name, "remove database directory");
 
     QString path = getPath();
@@ -141,11 +101,11 @@ bool LMDBAL::Base::removeDirectory() {
  *
  * \returns the path of the created directory
  *
- * \exception LMDBAL::Opened    - thrown if called on opened database
+ * \exception LMDBAL::Opened    - thrown if called on an opened database
  * \exception LMDBAL::Directory - if the database couldn't create the folder
  */
 QString LMDBAL::Base::createDirectory() {
-    if (opened)
+    if (opened())
         throw Opened(name, "create database directory");
 
     QString path = getPath();
@@ -184,8 +144,9 @@ QString LMDBAL::Base::getPath() const {
  *
  * \returns true if the database is opened and ready for work, false otherwise
  */
-bool LMDBAL::Base::ready() const {
-    return opened;}
+bool LMDBAL::Base::opened() const {
+    return !sessions.empty();
+}
 
 /**
  * \brief Drops the database
@@ -196,11 +157,11 @@ bool LMDBAL::Base::ready() const {
  * \exception LMDBAL::Unknown   - thrown if something unexpected happend
  */
 void LMDBAL::Base::drop() {
-    if (!opened)
+    if (!opened())
         throw Closed("drop", name);
 
     TransactionID txn = beginPrivateTransaction(emptyName);
-    for (const std::pair<const std::string, iStorage*>& pair : storages) {
+    for (const std::pair<const std::string, StorageCommon*>& pair : storages) {
         int rc = pair.second->drop(txn);
         if (rc != MDB_SUCCESS) {
             abortPrivateTransaction(txn, emptyName);
@@ -209,7 +170,7 @@ void LMDBAL::Base::drop() {
     }
 
     commitPrivateTransaction(txn, emptyName);
-    for (const std::pair<const std::string, iStorage*>& pair : storages)
+    for (const std::pair<const std::string, StorageCommon*>& pair : storages)
         pair.second->handleDrop();
 }
 
@@ -261,12 +222,13 @@ LMDBAL::WriteTransaction LMDBAL::Base::beginTransaction() {
  * \brief Aborts transaction
  *
  * Terminates transaction cancelling changes.
- * This is an optimal way to terminate read-only transactions
+ * Every storage receives notification about this transaction being aborted.
+ * This is an optimal way to abort public transactions
  *
  * \param[in] id    - transaction ID you want to abort
  *
  * \exception LMDBAL::Closed    - thrown if the database is closed
- * \exception LMDBAL::Unknown   - thrown if transaction with given ID was not found or if something unexpected happened
+ * \exception LMDBAL::Unknown   - thrown if something unexpected happened
  */
 void LMDBAL::Base::abortTransaction(LMDBAL::TransactionID id) const {
     return abortTransaction(id, emptyName);}
@@ -275,11 +237,13 @@ void LMDBAL::Base::abortTransaction(LMDBAL::TransactionID id) const {
  * \brief Commits transaction
  *
  * Terminates transaction applying changes.
+ * Every storage receives notification about this transaction being committed.
+ * This is an optimal way to commit public transactions
  *
  * \param[in] id    - transaction ID you want to commit
  *
  * \exception LMDBAL::Closed    - thrown if the database is closed
- * \exception LMDBAL::Unknown   - thrown if transaction with given ID was not found or if something unexpected happened
+ * \exception LMDBAL::Unknown   - thrown if something unexpected happened
  */
 void LMDBAL::Base::commitTransaction(LMDBAL::TransactionID id) {
     return commitTransaction(id, emptyName);}
@@ -287,7 +251,9 @@ void LMDBAL::Base::commitTransaction(LMDBAL::TransactionID id) {
 /**
  * \brief Begins read-only transaction
  *
- * This function is intended to be called from subordinate storage or cache
+ * This function is intended to be called from subordinate storage, cache, transaction or cursor.
+ * Every storage receives notification about this transaction being started.
+ * This is an optimal way to begin read-only public transactions.
  *
  * \param[in] storageName   - name of the storage/cache that you begin transaction from, needed just to inform if something went wrong
  *
@@ -297,12 +263,11 @@ void LMDBAL::Base::commitTransaction(LMDBAL::TransactionID id) {
  * \exception LMDBAL::Unknown   - thrown if something unexpected happened
  */
 LMDBAL::TransactionID LMDBAL::Base::beginReadOnlyTransaction(const std::string& storageName) const {
-    if (!opened)
+    if (!opened())
         throw Closed("beginReadOnlyTransaction", name, storageName);
 
     TransactionID txn = beginPrivateReadOnlyTransaction(storageName);
-    transactions->emplace(txn);
-    for (const std::pair<const std::string, LMDBAL::iStorage*>& pair : storages)
+    for (const std::pair<const std::string, LMDBAL::StorageCommon*>& pair : storages)
         pair.second->transactionStarted(txn, true);
 
     return txn;
@@ -311,7 +276,9 @@ LMDBAL::TransactionID LMDBAL::Base::beginReadOnlyTransaction(const std::string&
 /**
  * \brief Begins writable transaction
  *
- * This function is intended to be called from subordinate storage or cache
+ * This function is intended to be called from subordinate storage, cache, transaction or cursor.
+ * Every storage receives notification about this transaction being started.
+ * This is an optimal way to begin public transactions.
  *
  * \param[in] storageName   - name of the storage/cache that you begin transaction from, needed just to inform if something went wrong
  *
@@ -321,12 +288,11 @@ LMDBAL::TransactionID LMDBAL::Base::beginReadOnlyTransaction(const std::string&
  * \exception LMDBAL::Unknown   - thrown if something unexpected happened
  */
 LMDBAL::TransactionID LMDBAL::Base::beginTransaction(const std::string& storageName) const {
-    if (!opened)
+    if (!opened())
         throw Closed("beginTransaction", name, storageName);
 
     TransactionID txn = beginPrivateTransaction(storageName);
-    transactions->emplace(txn);
-    for (const std::pair<const std::string, LMDBAL::iStorage*>& pair : storages)
+    for (const std::pair<const std::string, LMDBAL::StorageCommon*>& pair : storages)
         pair.second->transactionStarted(txn, false);
 
     return txn;
@@ -336,55 +302,46 @@ LMDBAL::TransactionID LMDBAL::Base::beginTransaction(const std::string& storageN
  * \brief Aborts transaction
  *
  * Terminates transaction cancelling changes.
- * This is an optimal way to terminate read-only transactions.
- * This function is intended to be called from subordinate storage or cache
+ * Every storage receives notification about this transaction being aborted.
+ * This is an optimal way to abort public transactions.
+ * This function is intended to be called from subordinate storage, cache, transaction or cursor
  *
  * \param[in] id            - transaction ID you want to abort
  * \param[in] storageName   - name of the storage/cache that you begin transaction from, needed just to inform if something went wrong
  *
  * \exception LMDBAL::Closed    - thrown if the database is closed
- * \exception LMDBAL::Unknown   - thrown if transaction with given ID was not found or if something unexpected happened
+ * \exception LMDBAL::Unknown   - thrown if something unexpected happened
  */
 void LMDBAL::Base::abortTransaction(LMDBAL::TransactionID id, const std::string& storageName) const {
-    if (!opened)
+    if (!opened())
         throw Closed("abortTransaction", name, storageName);
 
-    Transactions::iterator itr = transactions->find(id);
-    if (itr == transactions->end())     //TODO may be it's a good idea to make an exception class for this
-        throw Unknown(name, "unable to abort transaction: transaction was not found", storageName);
-
     abortPrivateTransaction(id, storageName);
-    for (const std::pair<const std::string, LMDBAL::iStorage*>& pair : storages)
+    for (const std::pair<const std::string, LMDBAL::StorageCommon*>& pair : storages)
         pair.second->transactionAborted(id);
-
-    transactions->erase(itr);
 }
 
 /**
  * \brief Commits transaction
  *
  * Terminates transaction applying changes.
- * This function is intended to be called from subordinate storage or cache
+ * Every storage receives notification about this transaction being committed.
+ * This is an optimal way to commit public transactions
+ * This function is intended to be called from subordinate storage, cache, transaction or cursor
  *
  * \param[in] id            - transaction ID you want to commit
  * \param[in] storageName   - name of the storage/cache that you begin transaction from, needed just to inform if something went wrong
  *
  * \exception LMDBAL::Closed    - thrown if the database is closed
- * \exception LMDBAL::Unknown   - thrown if transaction with given ID was not found or if something unexpected happened
+ * \exception LMDBAL::Unknown   - thrown if something unexpected happened
  */
 void LMDBAL::Base::commitTransaction(LMDBAL::TransactionID id, const std::string& storageName) {
-    if (!opened)
+    if (!opened())
         throw Closed("abortTransaction", name, storageName);
 
-    Transactions::iterator itr = transactions->find(id);
-    if (itr == transactions->end())     //TODO may be it's a good idea to make an exception class for this
-        throw Unknown(name, "unable to commit transaction: transaction was not found", storageName);
-
     commitPrivateTransaction(id, storageName);
-    for (const std::pair<const std::string, LMDBAL::iStorage*>& pair : storages)
+    for (const std::pair<const std::string, LMDBAL::StorageCommon*>& pair : storages)
         pair.second->transactionCommited(id);
-
-    transactions->erase(itr);
 }
 
 /**
@@ -412,7 +369,7 @@ LMDBAL::TransactionID LMDBAL::Base::beginPrivateReadOnlyTransaction(const std::s
  * \brief Begins writable transaction
  *
  * This function is intended to be called from subordinate storage or cache,
- * it's not accounted in transaction collection, other storages and caches are not notified about this kind of transaction
+ * it's not accounted in the transaction collection, other storages and caches are not notified about this kind of transaction
  *
  * \param[in] storageName   - name of the storage/cache that you begin transaction from, needed just to inform if something went wrong
  *
@@ -433,10 +390,10 @@ LMDBAL::TransactionID LMDBAL::Base::beginPrivateTransaction(const std::string& s
 /**
  * \brief Aborts transaction
  *
- * Terminates transaction cancelling changes.
+ * Terminates transaction, cancelling changes.
  * This is an optimal way to terminate read-only transactions.
  * This function is intended to be called from subordinate storage or cache,
- * it's not accounted in transaction collection, other storages and caches are not notified about this kind of transaction
+ * it's not accounted in the transaction collection, other storages and caches are not notified about this kind of transaction
  *
  * \param[in] id            - transaction ID you want to abort
  * \param[in] storageName   - name of the storage/cache that you begin transaction from, unused here
@@ -463,3 +420,104 @@ void LMDBAL::Base::commitPrivateTransaction(LMDBAL::TransactionID id, const std:
     if (rc != MDB_SUCCESS)
         throw Unknown(name, mdb_strerror(rc), storageName);
 }
+
+/**
+ * \brief Registers session
+ *
+ * Registers the session in the session collection.
+ * If it was the first accounted session, it activates the database
+ *
+ * \exception LMDBAL::Unknown   - thrown if this session was already registered
+ */
+void LMDBAL::Base::registerSession(Session* session) {
+    std::lock_guard lock(mutex);
+
+    if (sessions.empty())
+        activate();
+
+    if (!sessions.insert(session).second)
+        throw Unknown(name, "session already registered");
+}
+
+/**
+ * \brief Unregisters session
+ *
+ * Unregisters the session from the session collection.
+ * If it was the last accounted session, it deactivates the database
+ *
+ * \exception LMDBAL::Unknown   - thrown if this session was not registered
+ */
+void LMDBAL::Base::unregisterSession(Session* session) {
+    std::lock_guard lock(mutex);
+
+    if (sessions.size() == 1)
+        deactivate();
+
+    if (sessions.erase(session) != 1)
+        throw Unknown(name, "session was not registered");
+}
+
+/**
+ * \brief Swaps sessions
+ *
+ * Replaces one session by another in the session collection.
+ *
+ * \exception LMDBAL::Unknown   - thrown if there is some unexpected state with sessions, it means the database is in the wrong state
+ */
+void LMDBAL::Base::replaceSession(Session* closing, Session* opening) {
+    std::lock_guard lock(mutex);
+
+    if (sessions.erase(closing) != 1)
+        throw Unknown(name, "session was not registered");
+
+    if (!sessions.insert(opening).second)
+        throw Unknown(name, "session already registered");
+}
+
+/**
+ * \brief Deactivates the database,
+ *
+ * Closes all lmdb handles, aborts all public transactions.
+ * This function will emit SIGSEGV on a deactivated database
+ *
+ * \exception LMDBAL::Unknown   - thrown if something went wrong aborting transactions
+ */
+void LMDBAL::Base::deactivate() {
+    for (const std::pair<TransactionID, Transaction*> pair : transactions) {
+        abortTransaction(pair.first, emptyName);
+        pair.second->reset();
+    }
+
+    for (const std::pair<const std::string, StorageCommon*>& pair : storages)
+        pair.second->close();
+
+    mdb_env_close(environment);
+    transactions.clear();
+}
+
+/**
+ * \brief Activates the database
+ *
+ * Almost every LMDBAL::Base require it to be opened, this function does it.
+ * It also creates the directory for the database if it was an initial launch.
+ * This function will behave unpredictably on an activated database, possible data corruption.
+ *
+ * \exception LMDBAL::Unknown - thrown if something went wrong opening storages and caches
+ */
+void LMDBAL::Base::activate() {
+    mdb_env_create(&environment);
+    QString path = createDirectory();
+
+    mdb_env_set_maxdbs(environment, static_cast<MDB_dbi>(storages.size()));
+    mdb_env_set_mapsize(environment, size * 1024UL * 1024UL);
+    mdb_env_open(environment, path.toStdString().c_str(), 0, 0664);
+
+    TransactionID txn = beginPrivateTransaction(emptyName);
+    for (const std::pair<const std::string, StorageCommon*>& pair : storages) {
+        StorageCommon* storage = pair.second;
+        if (const int rc = storage->open(txn))
+            throw Unknown(name, mdb_strerror(rc));
+    }
+
+    commitPrivateTransaction(txn, emptyName);
+}

src/base.h

@@ -16,14 +16,15 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_BASE_H
-#define LMDBAL_BASE_H
+#pragma once
 
 #include <map>
 #include <set>
 #include <string>
 #include <optional>
 #include <limits>
+#include <cstdint>
+#include <mutex>
 
 #include <QString>
 #include <QStandardPaths>
@@ -35,9 +36,10 @@
 
 namespace LMDBAL {
 
-class iStorage;
+class StorageCommon;
 class Transaction;
 class WriteTransaction;
+class Session;
 
 template<class T>
 class Serializer;
@@ -49,20 +51,20 @@ template <class K, class V>
 class Cache;
 
 typedef MDB_txn* TransactionID;                         /**<\brief I'm going to use transaction pointers as transaction IDs*/
-typedef uint32_t SizeType;                              /**<\brief All LMDBAL sizes are uint32_t*/
+typedef uint32_t SizeType;                              /**<\brief All LMDBAL sizes are uint32*/
 
 class Base {
-    friend class iStorage;
+    friend class StorageCommon;
     friend class Transaction;
     friend class WriteTransaction;
-public:
+    friend class Session;
 
+public:
     Base(const QString& name, uint16_t mapSize = 10);
     ~Base();
 
-    void open();
-    void close();
-    bool ready() const;
+    Session open();
+    bool opened() const;
     bool removeDirectory();
     QString createDirectory();
     QString getName() const;
@@ -85,8 +87,9 @@ public:
     LMDBAL::Cache<K, V>* getCache(const std::string& storageName);
 
 private:
-    typedef std::map<std::string, LMDBAL::iStorage*> Storages;  /**<\brief Storage and Cache pointers are saved in the std::map*/
-    typedef std::set<TransactionID> Transactions;               /**<\brief Piblic transaction IDs are saved in the std::set*/
+    typedef std::map<std::string, LMDBAL::StorageCommon *> Storages;    /**<\brief Storage and Cache pointers are saved in the std::map*/
+    typedef std::map<TransactionID, Transaction*> Transactions;         /**<\brief Public transaction IDs are saved in the std::map*/
+    typedef std::set<Session*> Sessions;                                /**<\brief Sessions are saved in the std::set*/
 
     void commitTransaction(TransactionID id);
     void abortTransaction(TransactionID id) const;
@@ -100,13 +103,21 @@ private:
     void commitPrivateTransaction(TransactionID id, const std::string& storageName);
     void abortPrivateTransaction(TransactionID id, const std::string& storageName) const;
 
+    void registerSession(Session* session);
+    void unregisterSession(Session* session);
+    void replaceSession(Session* closing, Session* opening);
+
+    void activate();
+    void deactivate();
+
 private:
     std::string name;                                           /**<\brief Name of this database*/
-    bool opened;                                                /**<\brief State of this database*/
+    Sessions sessions;                                          /**<\brief Opened session pointers*/
     uint16_t size;                                              /**<\brief lmdb map size in MiB*/
     MDB_env* environment;                                       /**<\brief lmdb environment handle*/
     Storages storages;                                          /**<\brief Registered storages and caches*/
-    Transactions* transactions;                                 /**<\brief Active public transactions*/
+    mutable Transactions transactions;                          /**<\brief Active public transactions*/
+    std::mutex mutex;                                           /**<\brief Mutex for thread safety*/
 
     inline static const std::string emptyName = "";             /**<\brief Empty string for general fallback purposes*/
 };
@@ -133,11 +144,11 @@ private:
  */
 template <class K, class V>
 LMDBAL::Storage<K, V>* LMDBAL::Base::addStorage(const std::string& storageName, bool duplicates) {
-    if (opened)
+    if (opened())
         throw Opened(name, "add storage " + storageName);
 
-    Storage<K, V>* storage = new Storage<K, V>(this, storageName, duplicates);
-    std::pair<Storages::const_iterator, bool> pair = storages.insert(std::make_pair(storageName, (iStorage*)storage));
+    auto storage = new Storage<K, V>(this, storageName, duplicates);
+    std::pair<Storages::const_iterator, bool> pair = storages.emplace(storageName, static_cast<StorageCommon *>(storage));
     if (!pair.second)
         throw StorageDuplicate(name, storageName);
 
@@ -161,11 +172,11 @@ LMDBAL::Storage<K, V>* LMDBAL::Base::addStorage(const std::string& storageName,
  */
 template<class K, class V>
 LMDBAL::Cache<K, V> * LMDBAL::Base::addCache(const std::string& storageName) {
-    if (opened)
+    if (opened())
         throw Opened(name, "add cache " + storageName);
 
-    Cache<K, V>* cache = new Cache<K, V>(this, storageName, false);
-    std::pair<Storages::const_iterator, bool> pair = storages.insert(std::make_pair(storageName, (iStorage*)cache));
+    auto cache = new Cache<K, V>(this, storageName, false);
+    std::pair<Storages::const_iterator, bool> pair = storages.emplace(storageName, static_cast<StorageCommon *>(cache));
     if (!pair.second)
         throw StorageDuplicate(name, storageName);
 
@@ -215,5 +226,3 @@ template <class K, class V>
 LMDBAL::Cache<K, V>* LMDBAL::Base::getCache(const std::string& storageName) {
     return static_cast<Cache<K, V>*>(storages.at(storageName));
 }
-
-#endif //LMDBAL_BASE_H

src/cache.h

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_CACHE_H
-#define LMDBAL_CACHE_H
+#pragma once
 
 #include <map>
 #include <set>
@@ -134,5 +133,3 @@ protected:
 }
 
 #include "cache.hpp"
-
-#endif // LMDBAL_CACHE_H

src/cache.hpp

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_CACHE_HPP
-#define LMDBAL_CACHE_HPP
+#pragma once
 
 #include "cache.h"
 #include "exceptions.h"
@@ -64,10 +63,10 @@ LMDBAL::Cache<K, V>::~Cache() {
 
 template<class K, class V>
 void LMDBAL::Cache<K, V>::addRecord(const K& key, const V& value) {
-    iStorage::ensureOpened(iStorage::addRecordMethodName);
+    StorageCommon::ensureOpened(StorageCommon::addRecordMethodName);
 
     if (cache->count(key) > 0)
-        iStorage::throwDuplicate(iStorage::toString(key));
+        StorageCommon::throwDuplicate(StorageCommon::toString(key));
 
     Storage<K, V>::addRecord(key, value);
     handleAddRecord(key, value);
@@ -76,7 +75,7 @@ void LMDBAL::Cache<K, V>::addRecord(const K& key, const V& value) {
 template<class K, class V>
 void LMDBAL::Cache<K, V>::addRecord(const K& key, const V& value, TransactionID txn) {
     if (cache->count(key) > 0)
-        iStorage::throwDuplicate(iStorage::toString(key));
+        StorageCommon::throwDuplicate(StorageCommon::toString(key));
 
     Storage<K, V>::addRecord(key, value, txn);
 
@@ -97,7 +96,7 @@ void LMDBAL::Cache<K, V>::handleAddRecord(const K& key, const V& value) {
 
 template<class K, class V>
 bool LMDBAL::Cache<K, V>::forceRecord(const K& key, const V& value) {
-    iStorage::ensureOpened(iStorage::forceRecordMethodName);
+    StorageCommon::ensureOpened(StorageCommon::forceRecordMethodName);
 
     bool added = Storage<K, V>::forceRecord(key, value);
     handleForceRecord(key, value, added);
@@ -137,18 +136,18 @@ void LMDBAL::Cache<K, V>::handleForceRecord(const K& key, const V& value, bool a
 
 template<class K, class V>
 void LMDBAL::Cache<K, V>::changeRecord(const K& key, const V& value) {
-    iStorage::ensureOpened(iStorage::changeRecordMethodName);
+    StorageCommon::ensureOpened(StorageCommon::changeRecordMethodName);
 
     if (mode == Mode::full) {
         typename std::map<K, V>::iterator itr = cache->find(key);
         if (itr == cache->end())
-            iStorage::throwNotFound(iStorage::toString(key));
+            StorageCommon::throwNotFound(StorageCommon::toString(key));
 
         Storage<K, V>::changeRecord(key, value);
         itr->second = value;
     } else {
         if (abscent->count(key) > 0)
-            iStorage::throwNotFound(iStorage::toString(key));
+            StorageCommon::throwNotFound(StorageCommon::toString(key));
 
         try {
             Storage<K, V>::changeRecord(key, value);
@@ -170,12 +169,12 @@ void LMDBAL::Cache<K, V>::changeRecord(const K& key, const V& value, Transaction
     if (mode == Mode::full) {
         typename std::map<K, V>::iterator itr = cache->find(key);
         if (itr == cache->end())
-            iStorage::throwNotFound(iStorage::toString(key));
+            StorageCommon::throwNotFound(StorageCommon::toString(key));
 
         Storage<K, V>::changeRecord(key, value, txn);
     } else {
         if (abscent->count(key) > 0)
-            iStorage::throwNotFound(iStorage::toString(key));
+            StorageCommon::throwNotFound(StorageCommon::toString(key));
 
         try {
             Storage<K, V>::changeRecord(key, value, txn);
@@ -208,7 +207,7 @@ void LMDBAL::Cache<K, V>::handleChangeRecord(const K& key, const V& value) {
 
 template<class K, class V>
 V LMDBAL::Cache<K, V>::getRecord(const K& key) const {
-    iStorage::ensureOpened(iStorage::getRecordMethodName);
+    StorageCommon::ensureOpened(StorageCommon::getRecordMethodName);
 
     V value;
     Cache<K, V>::getRecord(key, value);
@@ -217,7 +216,7 @@ V LMDBAL::Cache<K, V>::getRecord(const K& key) const {
 
 template<class K, class V>
 void LMDBAL::Cache<K, V>::getRecord(const K& key, V& out) const {
-    iStorage::ensureOpened(iStorage::getRecordMethodName);
+    StorageCommon::ensureOpened(StorageCommon::getRecordMethodName);
 
     typename std::map<K, V>::const_iterator itr = cache->find(key);
     if (itr != cache->end()) {
@@ -226,7 +225,7 @@ void LMDBAL::Cache<K, V>::getRecord(const K& key, V& out) const {
     }
 
     if (mode == Mode::full || abscent->count(key) != 0)
-        iStorage::throwNotFound(iStorage::toString(key));
+        StorageCommon::throwNotFound(StorageCommon::toString(key));
 
     try {
         Storage<K, V>::getRecord(key, out);
@@ -270,7 +269,7 @@ void LMDBAL::Cache<K, V>::getRecord(const K& key, V& out, TransactionID txn) con
                     }
                     break;
                 case Operation::remove:
-                        iStorage::throwNotFound(iStorage::toString(key));
+                        StorageCommon::throwNotFound(StorageCommon::toString(key));
                     break;
                 case Operation::change:
                     if (static_cast<std::pair<K, V>*>(entry.second)->first == key) {
@@ -286,7 +285,7 @@ void LMDBAL::Cache<K, V>::getRecord(const K& key, V& out, TransactionID txn) con
                     }
                     break;
                 case Operation::drop:
-                    iStorage::throwNotFound(iStorage::toString(key));
+                    StorageCommon::throwNotFound(StorageCommon::toString(key));
                     break;
                 case Operation::replace: {
                     std::map<K, V>* newMap = static_cast<std::map<K, V>*>(entry.second);
@@ -295,7 +294,7 @@ void LMDBAL::Cache<K, V>::getRecord(const K& key, V& out, TransactionID txn) con
                         out = vitr->second;
                         return;
                     } else {
-                        iStorage::throwNotFound(iStorage::toString(key));
+                        StorageCommon::throwNotFound(StorageCommon::toString(key));
                     }
                 }
                     break;
@@ -323,7 +322,7 @@ void LMDBAL::Cache<K, V>::getRecord(const K& key, V& out, TransactionID txn) con
     }
 
     if (mode == Mode::full || abscent->count(key) != 0)
-        iStorage::throwNotFound(iStorage::toString(key));
+        StorageCommon::throwNotFound(StorageCommon::toString(key));
 
     try {
         Storage<K, V>::getRecord(key, out, txn);
@@ -353,7 +352,7 @@ void LMDBAL::Cache<K, V>::discoveredRecord(const K& key, const V& value, Transac
 
 template<class K, class V>
 bool LMDBAL::Cache<K, V>::checkRecord(const K& key) const {
-    iStorage::ensureOpened(iStorage::checkRecordMethodName);
+    StorageCommon::ensureOpened(StorageCommon::checkRecordMethodName);
 
     typename std::map<K, V>::const_iterator itr = cache->find(key);
     if (itr != cache->end())
@@ -458,7 +457,7 @@ void LMDBAL::Cache<K, V>::appendToCache(const K& key, const V& value) const {
 
 template<class K, class V>
 std::map<K, V> LMDBAL::Cache<K, V>::readAll() const {
-    iStorage::ensureOpened(iStorage::readAllMethodName);
+    StorageCommon::ensureOpened(StorageCommon::readAllMethodName);
 
     if (mode != Mode::full) {               //there is a room for optimization
         mode = Mode::full;                  //I can read and deserialize only those values
@@ -472,7 +471,7 @@ std::map<K, V> LMDBAL::Cache<K, V>::readAll() const {
 
 template<class K, class V>
 void LMDBAL::Cache<K, V>::readAll(std::map<K, V>& out) const {
-    iStorage::ensureOpened(iStorage::readAllMethodName);
+    StorageCommon::ensureOpened(StorageCommon::readAllMethodName);
 
     if (mode != Mode::full) {               //there is a room for optimization
         mode = Mode::full;                  //I can read and deserialize only those values
@@ -643,7 +642,7 @@ void LMDBAL::Cache<K, V>::handleAddRecords(const std::map<K, V>& data, bool over
 
 template<class K, class V>
 void LMDBAL::Cache<K, V>::removeRecord(const K& key) {
-    iStorage::ensureOpened(iStorage::removeRecordMethodName);
+    StorageCommon::ensureOpened(StorageCommon::removeRecordMethodName);
 
     bool noKey = false;
     if (mode != Mode::full)
@@ -652,7 +651,7 @@ void LMDBAL::Cache<K, V>::removeRecord(const K& key) {
         noKey = abscent->count(key) > 0;
 
     if (noKey)
-        iStorage::throwNotFound(iStorage::toString(key));
+        StorageCommon::throwNotFound(StorageCommon::toString(key));
 
     Storage<K, V>::removeRecord(key);
     handleRemoveRecord(key);
@@ -667,7 +666,7 @@ void LMDBAL::Cache<K, V>::removeRecord(const K& key, TransactionID txn) {
         noKey = abscent->count(key) > 0;
 
     if (noKey)
-        iStorage::throwNotFound(iStorage::toString(key));
+        StorageCommon::throwNotFound(StorageCommon::toString(key));
 
     Storage<K, V>::removeRecord(key, txn);
 
@@ -782,8 +781,8 @@ void LMDBAL::Cache<K, V>::handleMode() const {
 
 template<class K, class V>
 int LMDBAL::Cache<K, V>::drop(const WriteTransaction& transaction) {
-    iStorage::ensureOpened(iStorage::dropMethodName);
-    TransactionID txn = iStorage::extractTransactionId(transaction, iStorage::dropMethodName);
+    StorageCommon::ensureOpened(StorageCommon::dropMethodName);
+    TransactionID txn = StorageCommon::extractTransactionId(transaction, StorageCommon::dropMethodName);
     int res = Storage<K, V>::drop(txn);
 
     if (res != MDB_SUCCESS)
@@ -898,5 +897,3 @@ void LMDBAL::Cache<K, V>::destroyTransactionEntry(const Entry& entry) const {
             break;
     }
 }
-
-#endif //LMDBAL_CACHE_HPP

src/cursor.h

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_CURSOR_H
-#define LMDBAL_CURSOR_H
+#pragma once
 
 #include <string>
 
@@ -25,19 +24,13 @@
 #include "base.h"
 #include "storage.h"
 #include "transaction.h"
+#include "cursorcommon.h"
 
 namespace LMDBAL {
 
 template <class K, class V>
-class Cursor {
+class Cursor : public CursorCommon {
     friend class Storage<K, V>;
-private:
-    enum State {            /**<Cursor state:*/
-        closed,             /**<    - closed*/
-        openedPublic,       /**<    - opened with public transaction, all storages will be notified about it after it's done*/
-        openedPrivate       /**<    - opened with private transaction, only current storage will be notified when cursor is closed*/
-    };
-
 public:
     Cursor();
     Cursor(Storage<K, V>* parent);
@@ -48,14 +41,6 @@ public:
     Cursor& operator = (const Cursor& other) = delete;
     Cursor& operator = (Cursor&& other);
 
-    void open();
-    void open(const Transaction& transaction);
-    void renew();
-    void renew(const Transaction& transaction);
-    void close();
-    bool opened() const;
-    bool empty() const;
-
     void drop();
 
     std::pair<K, V> first();
@@ -72,38 +57,10 @@ public:
     void current(K& key, V& value) const;
 
 private:
-    void dropped();
-    void freed();
-    void terminated();
     void operateCursorRead(K& key, V& value, MDB_cursor_op operation, const std::string& methodName, const std::string& operationName) const;
-
-private:
-    Storage<K, V>* storage;
-    MDB_cursor* cursor;
-    State state;
-    uint32_t id;
-
-    inline static const std::string openCursorMethodName = "Cursor::open";      /**<\brief member function name, just for exceptions*/
-    inline static const std::string closeCursorMethodName = "Cursor::close";    /**<\brief member function name, just for exceptions*/
-    inline static const std::string renewCursorMethodName = "Cursor::renew";    /**<\brief member function name, just for exceptions*/
-
-    inline static const std::string firstMethodName = "first";                  /**<\brief member function name, just for exceptions*/
-    inline static const std::string lastMethodName = "last";                    /**<\brief member function name, just for exceptions*/
-    inline static const std::string nextMethodName = "next";                    /**<\brief member function name, just for exceptions*/
-    inline static const std::string prevMethodName = "prev";                    /**<\brief member function name, just for exceptions*/
-    inline static const std::string currentMethodName = "current";              /**<\brief member function name, just for exceptions*/
-    inline static const std::string setMethodName = "set";                      /**<\brief member function name, just for exceptions*/
-
-    inline static const std::string firstOperationName = "Cursor::first";       /**<\brief member function name, just for exceptions*/
-    inline static const std::string lastOperationName = "Cursor::last";         /**<\brief member function name, just for exceptions*/
-    inline static const std::string nextOperationName = "Cursor::next";         /**<\brief member function name, just for exceptions*/
-    inline static const std::string prevOperationName = "Cursor::prev";         /**<\brief member function name, just for exceptions*/
-    inline static const std::string currentOperationName = "Cursor::current";   /**<\brief member function name, just for exceptions*/
 };
 
 };
 
 
 #include "cursor.hpp"
-
-#endif //LMDBAL_CURSOR_H

src/cursor.hpp

@@ -16,10 +16,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_CURSOR_HPP
-#define LMDBAL_CURSOR_HPP
+#pragma once
 
 #include "cursor.h"
+
 #include <iostream>
 
 /**
@@ -41,8 +41,6 @@
  * You are not supposed to instantiate or destory instances of this class yourself!
  */
 
-static uint32_t idCounter = 0;
-
 /**
  * \brief Creates a cursor
  *
@@ -50,12 +48,9 @@ static uint32_t idCounter = 0;
  */
 template<class K, class V>
 LMDBAL::Cursor<K, V>::Cursor(Storage<K, V>* parent):
-    storage(parent),
-    cursor(nullptr),
-    state(closed),
-    id(++idCounter)
+    CursorCommon(parent)
 {
-    storage->cursors[id] = this;
+    parent->cursors[id] = this;
 }
 
 /**
@@ -65,10 +60,7 @@ LMDBAL::Cursor<K, V>::Cursor(Storage<K, V>* parent):
  */
 template<class K, class V>
 LMDBAL::Cursor<K, V>::Cursor():
-    storage(nullptr),
-    cursor(nullptr),
-    state(closed),
-    id(0)
+    CursorCommon()
 {}
 
 /**
@@ -76,57 +68,39 @@ LMDBAL::Cursor<K, V>::Cursor():
  */
 template<class K, class V>
 LMDBAL::Cursor<K, V>::Cursor(Cursor&& other):
-    storage(other.storage),
-    cursor(other.cursor),
-    state(other.state),
-    id(other.id)
+    CursorCommon(std::move(other))
 {
-    other.terminated();
-    if (id != 0)
-        storage->cursors[id] = this;
-
-    other.freed();
+    if (!empty())
+        static_cast<Storage<K, V>*>(storage)->cursors[id] = this;
 }
 
 /**
- * \brief A private function that turns cursor into an empty one
+ * \brief Move assignment operator
  *
- * This function is called from LMDBAL::Storage, when it gets destroyed, but still has some valid.
- * Those cursors will become empty, and can't be used anymore
+ * Transfers other cursor into this one
  */
 template<class K, class V>
 LMDBAL::Cursor<K, V>& LMDBAL::Cursor<K, V>::operator = (Cursor&& other) {
-    terminated();
+    if (!empty() && other.empty())
+        static_cast<Storage<K, V>*>(storage)->cursors.erase(id);
 
-    if (id != 0)
-        storage->cursors.erase(id);
+    CursorCommon::operator=(std::move(other));
 
-    storage = other.storage;
-    cursor = other.cursor;
-    state = other.state;
-    id = other.id;
-
-    if (id != 0) {
-        other.freed();
-        other.state = closed;
-
-        storage->cursors[id] = this;
-    }
+    if (!empty())
+        static_cast<Storage<K, V>*>(storage)->cursors[id] = this;
 
     return *this;
 }
 
 /**
- * \brief Destroys a cursor
+ * \brief Destroys this cursor
  *
  * If the cursor wasn't properly closed - it's going to be upon destruction
  */
 template<class K, class V>
 LMDBAL::Cursor<K, V>::~Cursor () {
-    close();
-
     if (id != 0)
-        storage->cursors.erase(id);
+        static_cast<Storage<K, V>*>(storage)->cursors.erase(id);
 }
 
 /**
@@ -140,251 +114,9 @@ void LMDBAL::Cursor<K, V>::drop () {
     close();
 
     if (id != 0)
-        storage->cursors.erase(id);
+        static_cast<Storage<K, V>*>(storage)->cursors.erase(id);
 
-    freed();
-}
-
-/**
- * \brief A private method that turns cursor into an empty one
- *
- * This function is called from LMDBAL::Storage, when it gets destroyed, but still has some valid cursors.
- * Those cursors will become empty, and can't be used anymore
- */
-template<class K, class V>
-void LMDBAL::Cursor<K, V>::dropped () {
-    terminated();
-    freed();
-}
-
-/**
- * \brief A private method that turns cursor into an empty one (submethod)
- *
- * This function is called from LMDBAL::Storage, when the cursor is getting destoryed.
- * Those cursors will become empty, and can't be used anymore
- */
-template<class K, class V>
-void LMDBAL::Cursor<K, V>::freed () {
-    cursor = nullptr;
-    storage = nullptr;
-    id = 0;
-}
-
-/**
- * \brief Returns true if the cursor is empty
- *
- * Empty cursors can't be used, they can be only targets of move operations
- */
-template<class K, class V>
-bool LMDBAL::Cursor<K, V>::empty () const {
-    return id == 0;
-}
-
-/**
- * \brief A private function the storage owning this cursor will call to inform this cursor that the thansaction needs to be aborted
- */
-template<class K, class V>
-void LMDBAL::Cursor<K, V>::terminated () {
-    close();        //for now it's the same, but if I ever going to make writable cursor - here is where it's gonna be different
-}
-
-/**
- * \brief Opens the cursor for operations.
- *
- * This is a normal way to start the sequence of operations with the cursor.
- * This variant of the function creates a read only transaction just for this cursor
- *
- * This function should be called when the LMDBAL::Storage is already opened and before any query with this cursor!
- * It will do nothing to a cursor that was already opened (no matter what way).
- *
- * \exception LMDBAL::Closed        thrown if you try to open the cursor on a closed database
- * \exception LMDBAL::Unknown       thrown if there was a problem opening the cursor by the lmdb, or to begin a transaction
- * \exception LMDBAL::CursorEmpty   thrown if the cursor was empty
- */
-template<class K, class V>
-void LMDBAL::Cursor<K, V>::open () {
-    if (empty())
-        throw CursorEmpty(openCursorMethodName);
-
-    storage->ensureOpened(openCursorMethodName);
-    switch (state) {
-        case closed: {
-            TransactionID txn = storage->beginReadOnlyTransaction();
-            int result = storage->_mdbCursorOpen(txn, &cursor);
-            if (result != MDB_SUCCESS)
-                storage->throwUnknown(result, txn);
-
-            storage->transactionStarted(txn, true);
-            state = openedPrivate;
-        } break;
-        default:
-            break;
-    }
-}
-
-/**
- * \brief Opens the cursor for operations.
- *
- * This is a normal way to start the sequence of operations with the cursor.
- * This variant of the function uses for queries a transaction you have obtained somewhere else.
- *
- * This function should be called when the LMDBAL::Storage is already opened and before any query with this cursor!
- * It will do nothing to a cursor that was already opened (no matter what way).
- *
- * \param[in] transaction   - a transaction, can be read only
- *
- * \exception LMDBAL::Closed                thrown if you try to open the cursor on a closed database
- * \exception LMDBAL::Unknown               thrown if there was a problem opening the cursor by the lmdb
- * \exception LMDBAL::TransactionTerminated thrown if the passed transaction not active, any action with it's inner ID is an error
- * \exception LMDBAL::CursorEmpty           thrown if the cursor was empty
- */
-template<class K, class V>
-void LMDBAL::Cursor<K, V>::open (const Transaction& transaction) {
-    if (empty())
-        throw CursorEmpty(openCursorMethodName);
-
-    storage->ensureOpened(openCursorMethodName);
-    TransactionID txn = storage->extractTransactionId(transaction, openCursorMethodName);
-    switch (state) {
-        case closed: {
-            int result = storage->_mdbCursorOpen(txn, &cursor);
-            if (result != MDB_SUCCESS)
-                storage->throwUnknown(result);
-
-            state = openedPublic;
-        } break;
-        default:
-            break;
-    }
-}
-
-/**
- * \brief Renews a cursor
- *
- * This function aborts current transaction if the cursor was opened with it's own transaction
- * (does not mess up if the transaction was public),
- * creates new private transaction and rebinds this cursor to it.
- *
- * Theoretically you could call this method if your public transaction was aborted (or commited)
- * but you wish to continue to keep working with your cursor.
- * Or if you just want to rebind your cursor to a new private transaction.
- *
- * This function does nothing if the cursor is closed
- *
- * \exception LMDBAL::Closed        thrown if you try to renew the cursor on a closed database
- * \exception LMDBAL::Unknown       thrown if there was a problem beginning new transaction or if there was a problem renewing the cursor by lmdb
- * \exception LMDBAL::CursorEmpty   thrown if the cursor was empty
- */
-template<class K, class V>
-void LMDBAL::Cursor<K, V>::renew () {
-    if (empty())
-        throw CursorEmpty(openCursorMethodName);
-
-    storage->ensureOpened(renewCursorMethodName);
-    switch (state) {
-        case openedPrivate: {
-            TransactionID txn = storage->_mdbCursorTxn(cursor);
-            storage->abortTransaction(txn);
-            storage->transactionAborted(txn);
-            [[fallthrough]];
-        }
-        case openedPublic: {
-            TransactionID txn = storage->beginReadOnlyTransaction();
-            int result = storage->_mdbCursorRenew(txn, cursor);
-            if (result != MDB_SUCCESS)
-                storage->throwUnknown(result, txn);
-
-            storage->transactionStarted(txn, true);
-            state = openedPrivate;
-        } break;
-        default:
-            break;
-    }
-}
-
-/**
- * \brief Renews a cursor
- *
- * This function aborts current transaction if the cursor was opened with it's own transaction
- * (does not mess up if the transaction was public),
- *  and rebinds this cursor to a passed new transaction.
- *
- * Theoretically you could call this method if your previous public transaction was aborted (or commited)
- * but you wish to continue to keep working with your cursor.
- * Or if you just want to rebind your cursor to another public transaction.
- *
- * This function does nothing if the cursor is closed
- *
- * \param[in]   transaction     - a transaction you wish this cursor to be bound to
- *
- * \exception LMDBAL::Closed                thrown if you try to renew the cursor on a closed database
- * \exception LMDBAL::Unknown               thrown if there was a problem renewing the cursor by lmdb
- * \exception LMDBAL::TransactionTerminated thrown if the passed transaction not active, any action with it's inner ID is an error
- * \exception LMDBAL::CursorEmpty           thrown if the cursor was empty
- */
-template<class K, class V>
-void LMDBAL::Cursor<K, V>::renew (const Transaction& transaction) {
-    if (empty())
-        throw CursorEmpty(openCursorMethodName);
-
-    storage->ensureOpened(renewCursorMethodName);
-    TransactionID txn = storage->extractTransactionId(transaction, renewCursorMethodName);
-    switch (state) {
-        case openedPrivate: {
-            TransactionID txn = storage->_mdbCursorTxn(cursor);
-            storage->abortTransaction(txn);
-            storage->transactionAborted(txn);
-            [[fallthrough]];
-        }
-        case openedPublic: {
-            int result = storage->_mdbCursorRenew(txn, cursor);
-            if (result != MDB_SUCCESS)
-                storage->throwUnknown(result);
-
-            state = openedPublic;
-        } break;
-        default:
-            break;
-    }
-}
-
-/**
- * \brief Termiates a sequence of operations with the cursor
- *
- * This is a normal way to tell that you're done with the cursor and don't want to continue the sequence of queries.
- * The state of the cursor is lost after calling this method, some inner resorce is freed.
- *
- * If the cursor was opened with the private transaction - the owner storage will be notified of the aborted transaction.
- *
- * This function does nothing on a closed cursor.
- */
-template<class K, class V>
-void LMDBAL::Cursor<K, V>::close () {
-    switch (state) {
-        case openedPublic: {
-            storage->_mdbCursorClose(cursor);
-
-            state = closed;
-        } break;
-        case openedPrivate: {
-            TransactionID txn = storage->_mdbCursorTxn(cursor);
-            storage->_mdbCursorClose(cursor);
-            storage->abortTransaction(txn);
-            storage->transactionAborted(txn);
-
-            state = closed;
-        } break;
-        default:
-            break;
-    }
-}
-
-/**
- * \brief Tells if the cursor is open
- */
-template<class K, class V>
-bool LMDBAL::Cursor<K, V>::opened () const {
-    return state != closed;
+    reset();
 }
 
 /**
@@ -482,7 +214,7 @@ void LMDBAL::Cursor<K, V>::prev (K& key, V& value) {
  * \exception LMDBAL::Unknown          thrown if there was some unexpected problem with lmdb
  */
 template<class K, class V>
-void LMDBAL::Cursor<K, V>::current (K& key, V& value) const  {
+void LMDBAL::Cursor<K, V>::current (K& key, V& value) const {
     operateCursorRead(key, value, MDB_GET_CURRENT, currentMethodName, currentOperationName);
 }
 
@@ -605,16 +337,16 @@ std::pair<K, V> LMDBAL::Cursor<K, V>::current () const {
 template<class K, class V>
 bool LMDBAL::Cursor<K, V>::set (const K& key) {
     if (state == closed)
-        storage->throwCursorNotReady(setMethodName);
+        static_cast<Storage<K, V>*>(storage)->throwCursorNotReady(setMethodName);
 
-    MDB_val mdbKey = storage->keySerializer.setData(key);
-    int result = storage->_mdbCursorSet(cursor, mdbKey);
+    MDB_val mdbKey = static_cast<Storage<K, V>*>(storage)->keySerializer.setData(key);
+    int result = static_cast<Storage<K, V>*>(storage)->_mdbCursorSet(handle, mdbKey);
     if (result == MDB_SUCCESS)
         return true;
     else if (result == MDB_NOTFOUND)
         return false;
 
-    storage->throwUnknown(result);
+    static_cast<Storage<K, V>*>(storage)->throwUnknown(result);
     return false;   //unreachable, just to suppress the warning
 }
 
@@ -642,20 +374,18 @@ void LMDBAL::Cursor<K, V>::operateCursorRead(
     const std::string& operationName
 ) const {
     if (state == closed)
-        storage->throwCursorNotReady(methodName);
+        static_cast<Storage<K, V>*>(storage)->throwCursorNotReady(methodName);
 
     MDB_val mdbKey, mdbValue;
-    int result = storage->_mdbCursorGet(cursor, mdbKey, mdbValue, operation);
+    int result = static_cast<Storage<K, V>*>(storage)->_mdbCursorGet(handle, mdbKey, mdbValue, operation);
     if (result != MDB_SUCCESS)
-        storage->throwNotFoundOrUnknown(result, operationName);
+        static_cast<Storage<K, V>*>(storage)->throwNotFoundOrUnknown(result, operationName);
 
-    storage->keySerializer.deserialize(mdbKey, key);
-    storage->valueSerializer.deserialize(mdbValue, value);
+    static_cast<Storage<K, V>*>(storage)->keySerializer.deserialize(mdbKey, key);
+    static_cast<Storage<K, V>*>(storage)->valueSerializer.deserialize(mdbValue, value);
 
     if (state == openedPrivate)
-        storage->discoveredRecord(key, value);
+        static_cast<Storage<K, V>*>(storage)->discoveredRecord(key, value);
     else
-        storage->discoveredRecord(key, value, storage->_mdbCursorTxn(cursor));
+        static_cast<Storage<K, V>*>(storage)->discoveredRecord(key, value, static_cast<Storage<K, V>*>(storage)->_mdbCursorTxn(handle));
 }
-
-#endif //LMDBAL_CURSOR_HPP

src/cursorcommon.cpp

@@ -0,0 +1,366 @@
+/*
+ * LMDB Abstraction Layer.
+ * Copyright (C) 2023  Yury Gubich <blue@macaw.me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cursorcommon.h"
+
+/**
+ * \class LMDBAL::CursorCommon
+ * \brief An object to manage cursor internals and state.
+ *
+ * Cursors are owned by the storage, they die with the storage.
+ * They also get closed if the storage is closed (if you close by the database for example)
+ *
+ * You can obtain an instance of this class calling LMDBAL::Storage::createCursor()
+ * and destory it calling LMDBAL::Storage::destoryCursor() at any time, LMDBAL::Base doesn't necessarily need to be opened.
+ *
+ * You are not supposed to instantiate or destory instances of this class yourself!
+ */
+
+#include "storagecommon.h"
+
+static uint32_t idCounter = 0;
+
+/**
+ * \brief Creates a empty class
+ */
+LMDBAL::CursorCommon::CursorCommon ():
+    id(0),
+    state(closed),
+    handle(nullptr),
+    storage(nullptr)
+{}
+
+/**
+ * \brief Creates a cursor
+ *
+ * \param[in] _storage    a storage that created this cursor
+ */
+LMDBAL::CursorCommon::CursorCommon (StorageCommon* _storage):
+    id(++idCounter),
+    state(closed),
+    handle(nullptr),
+    storage(_storage)
+{}
+
+/**
+ * \brief Moves other cursor into this class
+ *
+ * \param[in] other     other instance that is being moved
+ */
+LMDBAL::CursorCommon::CursorCommon (CursorCommon&& other):
+    id(other.id),
+    state(other.state),
+    handle(other.handle),
+    storage(other.storage)
+{
+    other.dropped();
+
+    if (state == openedPublic)
+        attachToTransaction();
+}
+
+/**
+ * \brief Destroys this cursor
+ *
+ * If the cursor wasn't properly closed - it's going to be upon destruction
+ */
+LMDBAL::CursorCommon::~CursorCommon () noexcept {
+    close();
+}
+
+/**
+ * \brief Move assignment operator
+ *
+ * Transfers other cursor into this one
+ */
+LMDBAL::CursorCommon& LMDBAL::CursorCommon::operator = (CursorCommon&& other) {
+    terminated();
+
+    id = other.id;
+    state = other.state;
+    handle = other.handle;
+    storage = other.storage;
+
+    other.reset();
+
+    if (state == openedPublic)
+        attachToTransaction();
+
+    return *this;
+}
+
+/**
+ * \brief A private method that turns cursor into an empty one
+ *
+ * This method is called from LMDBAL::Storage, when the cursor is getting destoryed.
+ * After this method cursors will become empty, and can't be used anymore
+ */
+void LMDBAL::CursorCommon::reset () {
+    id = 0;
+    state = closed;
+    handle = nullptr;
+    storage = nullptr;
+}
+
+/**
+ * \brief A private method that turns cursor into an empty one
+ *
+ * This function is called from LMDBAL::Storage, when it gets destroyed, but still has some valid cursors.
+ * Those cursors will become empty, and can't be used anymore
+ */
+void LMDBAL::CursorCommon::dropped () {
+    terminated();
+    reset();
+}
+
+/**
+ * \brief A private function called to inform the cursor he has been terminated
+ *
+ * Is expected to be called from transaction, database, storage or move constructor
+ */
+void LMDBAL::CursorCommon::terminated () {
+    switch (state) {
+        case openedPublic:
+            storage->_mdbCursorClose(handle);
+            state = closed;
+            break;
+        case openedPrivate:
+            storage->closeCursorTransaction(handle, true);
+            state = closed;
+            break;
+        default:
+            break;
+    }
+}
+
+/**
+ * \brief Termiates a sequence of operations with the cursor
+ *
+ * This is a normal way to tell that you're done with the cursor and don't want to continue the sequence of queries.
+ * The state of the cursor is lost after calling this method, some inner resorce is freed.
+ *
+ * If the cursor was opened with the private transaction - the owner storage will be notified of the aborted transaction.
+ *
+ * This function does nothing on a closed cursor.
+ */
+void LMDBAL::CursorCommon::close () {
+    switch (state) {
+        case openedPublic:
+            disconnectFromTransaction();
+            storage->_mdbCursorClose(handle);
+
+            state = closed;
+        break;
+        case openedPrivate:
+            storage->closeCursorTransaction(handle, true);
+
+            state = closed;
+        break;
+        default:
+            break;
+    }
+}
+
+/**
+ * \brief Opens the cursor for operations.
+ *
+ * This is a normal way to start the sequence of operations with the cursor.
+ * This variant of the function creates a read only transaction just for this cursor
+ *
+ * This function should be called when the LMDBAL::Storage is already opened and before any query with this cursor!
+ * It will do nothing to a cursor that was already opened (no matter what way).
+ *
+ * \exception LMDBAL::Closed        thrown if you try to open the cursor on a closed database
+ * \exception LMDBAL::Unknown       thrown if there was a problem opening the cursor by the lmdb, or to begin a transaction
+ * \exception LMDBAL::CursorEmpty   thrown if the cursor was empty
+ */
+void LMDBAL::CursorCommon::open () {
+    if (empty())
+        throw CursorEmpty(openCursorMethodName);
+
+    switch (state) {
+        case closed:
+            storage->openCursorTransaction(&handle, false);
+            state = openedPrivate;
+        break;
+        default:
+            break;
+    }
+}
+
+/**
+ * \brief Opens the cursor for operations.
+ *
+ * This is a normal way to start the sequence of operations with the cursor.
+ * This variant of the function uses for queries a transaction you have obtained somewhere else.
+ *
+ * This function should be called when the LMDBAL::Storage is already opened and before any query with this cursor!
+ * It will do nothing to a cursor that was already opened (no matter what way).
+ *
+ * \param[in] transaction   - a transaction, can be read only
+ *
+ * \exception LMDBAL::Closed                thrown if you try to open the cursor on a closed database
+ * \exception LMDBAL::Unknown               thrown if there was a problem opening the cursor by the lmdb
+ * \exception LMDBAL::TransactionTerminated thrown if the passed transaction not active, any action with it's inner ID is an error
+ * \exception LMDBAL::CursorEmpty           thrown if the cursor was empty
+ */
+void LMDBAL::CursorCommon::open (const Transaction& transaction) {
+    if (empty())
+        throw CursorEmpty(openCursorMethodName);
+
+    storage->ensureOpened(openCursorMethodName);
+    TransactionID txn = storage->extractTransactionId(transaction, openCursorMethodName);
+    switch (state) {
+        case closed: {
+            int result = storage->_mdbCursorOpen(txn, &handle);
+            if (result != MDB_SUCCESS)
+                storage->throwUnknown(result);
+
+            transaction.cursors[id] = this;
+            state = openedPublic;
+        } break;
+        default:
+            break;
+    }
+}
+
+/**
+ * \brief Renews a cursor
+ *
+ * This function aborts current transaction if the cursor was opened with it's own transaction
+ * (does not mess up if the transaction was public),
+ * creates new private transaction and rebinds this cursor to it.
+ *
+ * Theoretically you could call this method if your public transaction was aborted (or commited)
+ * but you wish to continue to keep working with your cursor.
+ * Or if you just want to rebind your cursor to a new private transaction.
+ *
+ * This function does nothing if the cursor is closed
+ *
+ * \exception LMDBAL::Closed        thrown if you try to renew the cursor on a closed database
+ * \exception LMDBAL::Unknown       thrown if there was a problem beginning new transaction or if there was a problem renewing the cursor by lmdb
+ * \exception LMDBAL::CursorEmpty   thrown if the cursor was empty
+ */
+void LMDBAL::CursorCommon::renew () {
+    if (empty())
+        throw CursorEmpty(openCursorMethodName);
+
+    storage->ensureOpened(renewCursorMethodName);
+    switch (state) {
+        case openedPrivate:
+            storage->closeCursorTransaction(handle, false);
+            storage->openCursorTransaction(&handle, true);
+            break;
+        case openedPublic:
+            disconnectFromTransaction();
+            storage->openCursorTransaction(&handle, true);
+            state = openedPrivate;
+            break;
+        default:
+            break;
+    }
+}
+
+/**
+ * \brief Renews a cursor
+ *
+ * This function aborts current transaction if the cursor was opened with it's own transaction
+ * (does not mess up if the transaction was public),
+ *  and rebinds this cursor to a passed new transaction.
+ *
+ * Theoretically you could call this method if your previous public transaction was aborted (or commited)
+ * but you wish to continue to keep working with your cursor.
+ * Or if you just want to rebind your cursor to another public transaction.
+ *
+ * This function does nothing if the cursor is closed
+ *
+ * \param[in]   transaction     - a transaction you wish this cursor to be bound to
+ *
+ * \exception LMDBAL::Closed                thrown if you try to renew the cursor on a closed database
+ * \exception LMDBAL::Unknown               thrown if there was a problem renewing the cursor by lmdb
+ * \exception LMDBAL::TransactionTerminated thrown if the passed transaction not active, any action with it's inner ID is an error
+ * \exception LMDBAL::CursorEmpty           thrown if the cursor was empty
+ */
+void LMDBAL::CursorCommon::renew (const Transaction& transaction) {
+    if (empty())
+        throw CursorEmpty(openCursorMethodName);
+
+    storage->ensureOpened(renewCursorMethodName);
+    TransactionID txn = storage->extractTransactionId(transaction, renewCursorMethodName);
+    switch (state) {
+        case openedPrivate: {
+            storage->closeCursorTransaction(handle, false);
+            int result = storage->_mdbCursorRenew(txn, handle);
+            if (result != MDB_SUCCESS)
+                storage->throwUnknown(result);
+
+            transaction.cursors[id] = this;
+            state = openedPublic;
+        } break;
+        case openedPublic: {
+            disconnectFromTransaction();
+            int result = storage->_mdbCursorRenew(txn, handle);
+            if (result != MDB_SUCCESS)
+                storage->throwUnknown(result);
+
+            transaction.cursors[id] = this;
+        } break;
+        default:
+            break;
+    }
+}
+
+/**
+ * \brief Returns true if the cursor is empty
+ *
+ * Empty cursors can't be used, they can be only targets of move operations
+ */
+bool LMDBAL::CursorCommon::empty () const {
+    return id == 0;
+}
+
+/**
+ * \brief Tells if the cursor is open
+ */
+bool LMDBAL::CursorCommon::opened () const {
+    return state != closed;
+}
+
+/**
+ * \brief Links cursor to the transaction it has been opened with
+ *
+ * Cursor must be opened by a public transaction
+ *
+ * \exception std::out_of_range     thrown if LMDBAL::Transaction pointer wasn't found in the LMDBAL::Base
+ */
+void LMDBAL::CursorCommon::attachToTransaction () {
+    Transaction* txn = storage->getTransactionForCursor(handle);
+    txn->cursors[id] = this;
+}
+
+/**
+ * \brief Disconnects cursor from the transaction it has been opened with
+ *
+ * Cursor must be still opened by a public transaction
+ *
+ * \exception std::out_of_range     thrown if LMDBAL::Transaction pointer wasn't found in the LMDBAL::Base
+ */
+void LMDBAL::CursorCommon::disconnectFromTransaction () {
+    Transaction* txn = storage->getTransactionForCursor(handle);
+    txn->cursors.erase(id);
+}

src/cursorcommon.h

@@ -0,0 +1,94 @@
+/*
+ * LMDB Abstraction Layer.
+ * Copyright (C) 2023  Yury Gubich <blue@macaw.me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <string>
+
+#include <lmdb.h>
+
+namespace LMDBAL {
+
+class Transaction;
+class StorageCommon;
+
+class CursorCommon {
+    friend class Transaction;
+protected:
+    enum State {            /**<Cursor state:*/
+        closed,             /**<    - closed*/
+        openedPublic,       /**<    - opened with public transaction, all storages will be notified about it after it's done*/
+        openedPrivate       /**<    - opened with private transaction, only current storage will be notified when cursor is closed*/
+    };
+
+protected:
+    CursorCommon();
+    CursorCommon(StorageCommon* storage);
+    CursorCommon(const CursorCommon& other) = delete;
+    CursorCommon(CursorCommon&& other);
+    virtual ~CursorCommon() noexcept;
+
+    CursorCommon& operator = (const CursorCommon& other) = delete;
+    CursorCommon& operator = (CursorCommon&& other);
+
+public:
+    void open();
+    void open(const Transaction& transaction);
+    void renew();
+    void renew(const Transaction& transaction);
+    bool opened() const;
+    bool empty() const;
+    void close();
+
+protected:
+    void terminated();
+    void dropped();
+    void reset();
+
+private:
+    void attachToTransaction();
+    void disconnectFromTransaction();
+
+protected:
+    uint32_t id;
+    State state;
+    MDB_cursor* handle;
+    StorageCommon* storage;
+
+private:
+    inline static const std::string openCursorMethodName = "Cursor::open";      /**<\brief member function name, just for exceptions*/
+    inline static const std::string closeCursorMethodName = "Cursor::close";    /**<\brief member function name, just for exceptions*/
+    inline static const std::string renewCursorMethodName = "Cursor::renew";    /**<\brief member function name, just for exceptions*/
+
+protected:
+    inline static const std::string firstMethodName = "first";                  /**<\brief member function name, just for exceptions in heir*/
+    inline static const std::string lastMethodName = "last";                    /**<\brief member function name, just for exceptions in heir*/
+    inline static const std::string nextMethodName = "next";                    /**<\brief member function name, just for exceptions in heir*/
+    inline static const std::string prevMethodName = "prev";                    /**<\brief member function name, just for exceptions in heir*/
+    inline static const std::string currentMethodName = "current";              /**<\brief member function name, just for exceptions in heir*/
+    inline static const std::string setMethodName = "set";                      /**<\brief member function name, just for exceptions in heir*/
+
+    inline static const std::string firstOperationName = "Cursor::first";       /**<\brief member function name, just for exceptions in heir*/
+    inline static const std::string lastOperationName = "Cursor::last";         /**<\brief member function name, just for exceptions in heir*/
+    inline static const std::string nextOperationName = "Cursor::next";         /**<\brief member function name, just for exceptions in heir*/
+    inline static const std::string prevOperationName = "Cursor::prev";         /**<\brief member function name, just for exceptions in heir*/
+    inline static const std::string currentOperationName = "Cursor::current";   /**<\brief member function name, just for exceptions in heir*/
+};
+
+}

src/exceptions.h

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_EXCEPTIONS_H
-#define LMDBAL_EXCEPTIONS_H
+#pragma once
 
 #include <stdexcept>
 #include <string>
@@ -41,7 +40,7 @@ public:
 /**
  * \brief Thrown if LMDBAL had issues creating or opening database directory
  */
-class Directory: public Exception {
+class Directory : public Exception {
 public:
     /**
      * \brief Creates exception
@@ -237,5 +236,3 @@ private:
 };
 
 }
-
-#endif //LMDBAL_EXCEPTIONS_H

src/operators.hpp

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_OPERATORS_HPP
-#define LMDBAL_OPERATORS_HPP
+#pragma once
 
 #include <map>
 #include <set>
@@ -209,5 +208,3 @@ QDataStream& operator >> (QDataStream &in, std::list<K>& container) {
 
     return in;
 }
-
-#endif //LMDBAL_OPERATORS_HPP

src/serializer/CMakeLists.txt

@@ -16,4 +16,4 @@ set(HEADERS
   serializer_qbytearray.hpp
 )
 
-install(FILES ${HEADERS} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${PROJECT_LOW})
+install(FILES ${HEADERS} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${LMDBAL_NAME_LOW})

src/serializer/serializer.h

@@ -16,8 +16,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_SERIALIZER_H
-#define LMDBAL_SERIALIZER_H
+#pragma once
+
 
 #include <cstring>
 
@@ -68,5 +68,3 @@ private:
 #include "serializer_stdstring.hpp"
 #include "serializer_qstring.hpp"
 #include "serializer_qbytearray.hpp"
-
-#endif // LMDBAL_SERIALIZER_H

src/serializer/serializer.hpp

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_SERIALIZER_HPP
-#define LMDBAL_SERIALIZER_HPP
+#pragma once
 
 #include "serializer.h"
 
@@ -115,7 +114,7 @@ T LMDBAL::Serializer<T>::deserialize(const MDB_val& value) {
 template<class T>
 void LMDBAL::Serializer<T>::deserialize(const MDB_val& value, T& result) {
     clear();
-    bytes.setRawData((char*)value.mv_data, value.mv_size);
+    bytes.setRawData(static_cast<char *>(value.mv_data), value.mv_size);
     stream >> result;
 }
 
@@ -155,9 +154,7 @@ MDB_val LMDBAL::Serializer<T>::getData() {
     MDB_val val;
 
     val.mv_size = buffer.pos();
-    val.mv_data = (char*)bytes.data();
+    val.mv_data = bytes.data();
 
     return val;
 }
-
-#endif //LMDBAL_SERIALIZER_HPP

src/serializer/serializer_double.hpp

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_SERIALIZER_DOUBLE_HPP
-#define LMDBAL_SERIALIZER_DOUBLE_HPP
+#pragma once
 
 namespace LMDBAL {
 
@@ -53,7 +52,5 @@ private:
 
 }
 
-#endif //LMDBAL_SERIALIZER_DOUBLE_HPP
-
 
 

src/serializer/serializer_float.hpp

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_SERIALIZER_FLOAT_HPP
-#define LMDBAL_SERIALIZER_FLOAT_HPP
+#pragma once
 
 namespace LMDBAL {
 
@@ -52,8 +51,3 @@ private:
 };
 
 }
-
-#endif //LMDBAL_SERIALIZER_FLOAT_HPP
-
-
-

src/serializer/serializer_int16.hpp

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_SERIALIZER_INT16_HPP
-#define LMDBAL_SERIALIZER_INT16_HPP
+#pragma once
 
 #include <stdint.h>
 
@@ -54,5 +53,3 @@ private:
 };
 
 }
-
-#endif //LMDBAL_SERIALIZER_INT16_HPP

src/serializer/serializer_int32.hpp

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_SERIALIZER_INT32_HPP
-#define LMDBAL_SERIALIZER_INT32_HPP
+#pragma once
 
 #include <stdint.h>
 
@@ -54,8 +53,3 @@ private:
 };
 
 }
-
-#endif //LMDBAL_SERIALIZER_INT32_HPP
-
-
-

src/serializer/serializer_int64.hpp

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_SERIALIZER_INT64_HPP
-#define LMDBAL_SERIALIZER_INT64_HPP
+#pragma once
 
 #include <stdint.h>
 
@@ -54,8 +53,3 @@ private:
 };
 
 }
-
-#endif //LMDBAL_SERIALIZER_INT64_HPP
-
-
-

src/serializer/serializer_int8.hpp

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_SERIALIZER_INT8_HPP
-#define LMDBAL_SERIALIZER_INT8_HPP
+#pragma once
 
 #include <stdint.h>
 
@@ -54,8 +53,3 @@ private:
 };
 
 }
-
-#endif //LMDBAL_SERIALIZER_INT8_HPP
-
-
-

src/serializer/serializer_qbytearray.hpp

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_SERIALIZER_QBYTEARRAY_HPP
-#define LMDBAL_SERIALIZER_QBYTEARRAY_HPP
+#pragma once
 
 #include <QByteArray>
 
@@ -35,7 +34,17 @@ public:
         return value;
     };
     void deserialize(const MDB_val& data, QByteArray& result) {
-        result.setRawData((char*)data.mv_data, data.mv_size);
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+        if (data.mv_size > static_cast<size_t>(std::numeric_limits<qsizetype>::max()))
+            throw std::runtime_error("Data size exceeds QByteArray capacity");
+
+        result.setRawData(static_cast<char *>(data.mv_data), static_cast<qsizetype>(data.mv_size));
+#else
+        if (data.mv_size > static_cast<size_t>(std::numeric_limits<uint>::max()))
+            throw std::runtime_error("Data size exceeds QByteArray capacity");
+
+        result.setRawData(static_cast<char *>(data.mv_data), static_cast<uint>(data.mv_size));
+#endif
     }
     MDB_val setData(const QByteArray& data) {
         value = data;
@@ -44,7 +53,7 @@ public:
     MDB_val getData() {
         MDB_val result;
         result.mv_data = value.data();
-        result.mv_size = value.size();
+        result.mv_size = static_cast<size_t>(value.size());
         return result;
     };
     void clear() {
@@ -56,9 +65,3 @@ private:
 };
 
 }
-
-#endif //LMDBAL_SERIALIZER_QBYTEARRAY_HPP
-
-
-
-

src/serializer/serializer_qstring.hpp

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_SERIALIZER_QSTRING_HPP
-#define LMDBAL_SERIALIZER_QSTRING_HPP
+#pragma once
 
 #include <QString>
 #include <QByteArray>
@@ -32,11 +31,33 @@ public:
     ~Serializer() {};
 
     QString deserialize(const MDB_val& data) {
-        value = QByteArray((char*)data.mv_data, data.mv_size);
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+        if (data.mv_size > static_cast<size_t>(std::numeric_limits<qsizetype>::max()))
+            throw std::runtime_error("Data size exceeds QByteArray capacity");
+
+        value = QByteArray(static_cast<char *>(data.mv_data), static_cast<qsizetype>(data.mv_size));
+#else
+        if (data.mv_size > static_cast<size_t>(std::numeric_limits<int>::max()))
+            throw std::runtime_error("Data size exceeds QByteArray capacity");
+
+        value = QByteArray(static_cast<char *>(data.mv_data), static_cast<int>(data.mv_size));
+#endif
+
         return QString::fromUtf8(value);
     };
     void deserialize(const MDB_val& data, QString& result) {
-        value = QByteArray((char*)data.mv_data, data.mv_size);
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+        if (data.mv_size > static_cast<size_t>(std::numeric_limits<qsizetype>::max()))
+            throw std::runtime_error("Data size exceeds QByteArray capacity");
+
+        value = QByteArray(static_cast<char *>(data.mv_data), static_cast<qsizetype>(data.mv_size));
+#else
+        if (data.mv_size > static_cast<size_t>(std::numeric_limits<int>::max()))
+            throw std::runtime_error("Data size exceeds QByteArray capacity");
+
+        value = QByteArray(static_cast<char *>(data.mv_data), static_cast<int>(data.mv_size));
+#endif
+
         result = QString::fromUtf8(value);
     }
     MDB_val setData(const QString& data) {
@@ -46,7 +67,7 @@ public:
     MDB_val getData() {
         MDB_val result;
         result.mv_data = value.data();
-        result.mv_size = value.size();
+        result.mv_size = static_cast<size_t>(value.size());
         return result;
     };
     void clear() {};    //not possible;
@@ -56,10 +77,3 @@ private:
 };
 
 }
-
-#endif //LMDBAL_SERIALIZER_QSTRING_HPP
-
-
-
-
-

src/serializer/serializer_stdstring.hpp

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_SERIALIZER_STDSTRING_HPP
-#define LMDBAL_SERIALIZER_STDSTRING_HPP
+#pragma once
 
 #include <string>
 
@@ -35,7 +34,7 @@ public:
         return value;
     };
     void deserialize(const MDB_val& data, std::string& result) {
-        result.assign((char*)data.mv_data, data.mv_size);
+        result.assign(static_cast<char *>(data.mv_data), data.mv_size);
     }
     MDB_val setData(const std::string& data) {
         value = data;
@@ -43,7 +42,7 @@ public:
     };
     MDB_val getData() {
         MDB_val result;
-        result.mv_data = (char*)value.c_str();
+        result.mv_data = const_cast<char *>(value.c_str());
         result.mv_size = value.size();
         return result;
     };
@@ -54,9 +53,3 @@ private:
 };
 
 }
-
-#endif //LMDBAL_SERIALIZER_STDSTRING_HPP
-
-
-
-

src/serializer/serializer_uint16.hpp

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_SERIALIZER_UINT16_HPP
-#define LMDBAL_SERIALIZER_UINT16_HPP
+#pragma once
 
 #include <stdint.h>
 
@@ -54,7 +53,3 @@ private:
 };
 
 }
-
-#endif //LMDBAL_SERIALIZER_UINT16_HPP
-
-

src/serializer/serializer_uint32.hpp

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_SERIALIZER_UINT32_HPP
-#define LMDBAL_SERIALIZER_UINT32_HPP
+#pragma once
 
 #include <stdint.h>
 
@@ -54,5 +53,3 @@ private:
 };
 
 }
-
-#endif //LMDBAL_SERIALIZER_UINT32_HPP

src/serializer/serializer_uint64.hpp

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_SERIALIZER_UINT64_HPP
-#define LMDBAL_SERIALIZER_UINT64_HPP
+#pragma once
 
 #include <stdint.h>
 
@@ -54,6 +53,3 @@ private:
 };
 
 }
-
-#endif //LMDBAL_SERIALIZER_UINT64_HPP
-

src/serializer/serializer_uint8.hpp

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_SERIALIZER_UINT8_HPP
-#define LMDBAL_SERIALIZER_UINT8_HPP
+#pragma once
 
 #include <stdint.h>
 
@@ -54,8 +53,3 @@ private:
 };
 
 }
-
-#endif //LMDBAL_SERIALIZER_UINT8_HPP
-
-
-

src/session.cpp

@@ -0,0 +1,73 @@
+/*
+* LMDB Abstraction Layer.
+ * Copyright (C) 2023  Yury Gubich <blue@macaw.me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "session.h"
+
+LMDBAL::Session::Session():
+    parent(nullptr) {}
+
+LMDBAL::Session::Session(Base* parent):
+    parent(parent)
+{
+    parent->registerSession(this);
+}
+
+LMDBAL::Session::Session(Session&& other):
+    parent(other.parent)
+{
+    if (parent)
+        parent->replaceSession(&other, this);
+}
+
+LMDBAL::Session::~Session() {
+    if (parent)
+        parent->unregisterSession(this);
+}
+
+LMDBAL::Session& LMDBAL::Session::operator = (Session&& other) {
+    if (parent)
+        if (other.parent)
+            parent->unregisterSession(&other);
+        else
+            parent->unregisterSession(this);
+    else
+        if (other.parent)
+            other.parent->replaceSession(&other, this);
+
+    parent = other.parent;
+    other.terminate();
+
+    return *this;
+}
+
+void LMDBAL::Session::close() {
+    if (!parent)
+        return;
+
+    parent->unregisterSession(this);
+    terminate();
+}
+
+bool LMDBAL::Session::opened() const {
+    return parent != nullptr;
+}
+
+void LMDBAL::Session::terminate() {
+    parent = nullptr;
+}
+

src/session.h

@@ -0,0 +1,47 @@
+/*
+* LMDB Abstraction Layer.
+ * Copyright (C) 2023  Yury Gubich <blue@macaw.me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "base.h"
+
+namespace LMDBAL {
+
+class Session {
+    friend class Base;
+public:
+    explicit Session();
+    ~Session();
+    Session(const Session&) = delete;
+    Session(Session&&);
+
+    Session& operator = (const Session&) = delete;
+    Session& operator = (Session&&);
+
+    void close();
+    bool opened() const;
+
+private:
+    Base* parent;
+
+private:
+    Session(Base* parent);
+    void terminate();
+};
+
+}

src/storage.h

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_STORAGE_H
-#define LMDBAL_STORAGE_H
+#pragma once
 
 #include <type_traits>
 #include <cstring>
@@ -26,6 +25,7 @@
 #include "serializer.h"
 #include "cursor.h"
 #include "transaction.h"
+#include "storagecommon.h"
 
 class BaseTest;
 class DuplicatesTest;
@@ -34,105 +34,8 @@ class StorageCursorTest;
 
 namespace LMDBAL {
 
-class iStorage {
-    friend class Base;
-public:
-protected:
-    iStorage(Base* parent, const std::string& name, bool duplicates = false);
-    virtual ~iStorage();
-
-    /**
-    * \brief A private virtual function I need to open each storage in the database
-    *
-    * \param[in] transaction   - lmdb transaction to call <a class="el" href="http://www.lmdb.tech/doc/group__mdb.html#gac08cad5b096925642ca359a6d6f0562a">mdb_dbi_open</a>
-    * \returns MDB_SUCCESS if everything went smooth or MDB_<error> -like error code
-    */
-    virtual int open(MDB_txn * transaction) = 0;
-    virtual void close();
-    virtual void handleDrop();
-
-    bool isDBOpened() const;
-    const std::string& dbName() const;
-
-    void ensureOpened(const std::string& methodName) const;
-    void throwDuplicateOrUnknown(int rc, const std::string& key) const;
-    void throwDuplicateOrUnknown(int rc, TransactionID txn, const std::string& key) const;
-    void throwNotFoundOrUnknown(int rc, const std::string& key) const;
-    void throwNotFoundOrUnknown(int rc, TransactionID txn, const std::string& key) const;
-    void throwUnknown(int rc, TransactionID txn) const;
-    void throwUnknown(int rc) const;
-    void throwUnknown(const std::string& message) const;
-    void throwDuplicate(const std::string& key) const;
-    void throwNotFound(const std::string& key) const;
-    void throwCursorNotReady(const std::string& method) const;
-
-    TransactionID extractTransactionId(const Transaction& txn, const std::string& action = "") const;
-    TransactionID beginReadOnlyTransaction() const;
-    TransactionID beginTransaction() const;
-    void commitTransaction(TransactionID id);
-    void abortTransaction(TransactionID id) const;
-    virtual void transactionStarted(TransactionID txn, bool readOnly) const;
-    virtual void transactionCommited(TransactionID txn);
-    virtual void transactionAborted(TransactionID txn) const;
-    virtual int drop(TransactionID transaction);
-    virtual SizeType count(TransactionID txn) const;
-
-    int _mdbOpen(MDB_txn* txn, unsigned int flags = 0);
-
-    int _mdbPut(MDB_txn* txn, MDB_val& key, MDB_val& data, unsigned int flags = 0);
-    int _mdbGet(MDB_txn* txn, MDB_val& key, MDB_val& data) const;
-    int _mdbDel(MDB_txn* txn, MDB_val& key);
-    int _mdbDel(MDB_txn* txn, MDB_val& key, MDB_val& data);
-
-    int _mdbStat(MDB_txn* txn, MDB_stat& stat) const;
-    int _mdbFlags(MDB_txn* txn, uint32_t& flags) const;
-
-    int _mdbCursorOpen(MDB_txn* txn, MDB_cursor** cursor) const;
-    void _mdbCursorClose(MDB_cursor* cursor) const;
-    int _mdbCursorGet(MDB_cursor* cursor, MDB_val& key, MDB_val& data, MDB_cursor_op operation) const;
-    int _mdbCursorSet(MDB_cursor* cursor, MDB_val& key) const;
-    int _mdbCursorDel(MDB_cursor* cursor, unsigned int flags = 0);
-    int _mdbCursorPut(MDB_cursor* cursor, MDB_val& key, MDB_val& data, unsigned int flags = 0);
-
-    int _mdbCursorRenew(MDB_txn* txn, MDB_cursor* cursor) const;
-    MDB_txn* _mdbCursorTxn(MDB_cursor* cursor) const;
-
-public:
-    virtual void drop();
-    virtual int drop(const WriteTransaction& txn);
-    virtual SizeType count() const;
-    virtual SizeType count(const Transaction& txn) const;
-
-protected:
-    MDB_dbi dbi;                                                                /**<\brief lmdb storage handle*/
-    Base* db;                                                                   /**<\brief parent database pointer (borrowed)*/
-    const std::string name;                                                     /**<\brief this storage name*/
-    const bool duplicates;                                                      /**<\brief true if storage supports duplicates*/
-
-    inline static const std::string dropMethodName = "drop";                    /**<\brief member function name, just for exceptions*/
-    inline static const std::string countMethodName = "count";                  /**<\brief member function name, just for exceptions*/
-    inline static const std::string flagsMethodName = "flags";                  /**<\brief member function name, just for exceptions*/
-
-    inline static const std::string addRecordMethodName = "addRecord";          /**<\brief member function name, just for exceptions*/
-    inline static const std::string forceRecordMethodName = "forceRecord";      /**<\brief member function name, just for exceptions*/
-    inline static const std::string changeRecordMethodName = "changeRecord";    /**<\brief member function name, just for exceptions*/
-    inline static const std::string removeRecordMethodName = "removeRecord";    /**<\brief member function name, just for exceptions*/
-    inline static const std::string checkRecordMethodName = "checkRecord";      /**<\brief member function name, just for exceptions*/
-    inline static const std::string getRecordMethodName = "getRecord";          /**<\brief member function name, just for exceptions*/
-    inline static const std::string readAllMethodName = "readAllRecord";        /**<\brief member function name, just for exceptions*/
-    inline static const std::string replaceAllMethodName = "replaceAll";        /**<\brief member function name, just for exceptions*/
-    inline static const std::string addRecordsMethodName = "addRecords";        /**<\brief member function name, just for exceptions*/
-
-protected:
-    template <class K, class V>
-    int makeStorage(MDB_txn* transaction, bool duplicates = false);
-
-    template <class T>
-    static std::string toString(const T& value);
-};
-
 template <class K, class V>
-class Storage : public iStorage {
+class Storage : public StorageCommon {
     friend class ::BaseTest;
     friend class ::DuplicatesTest;
     friend class ::CacheCursorTest;
@@ -160,7 +63,7 @@ protected:
     virtual uint32_t addRecords(const std::map<K, V>& data, TransactionID txn, bool overwrite = false);
 
 public:
-    using iStorage::drop;
+    using StorageCommon::drop;
     virtual void addRecord(const K& key, const V& value);
     virtual void addRecord(const K& key, const V& value, const WriteTransaction& txn);
     virtual bool forceRecord(const K& key, const V& value);     //returns true if there was addition, false if change
@@ -199,5 +102,3 @@ protected:
 }
 
 #include "storage.hpp"
-
-#endif //LMDBAL_STORAGE_H

src/storage.hpp

@@ -16,8 +16,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LMDBAL_STORAGE_HPP
-#define LMDBAL_STORAGE_HPP
+#pragma once
 
 #include "storage.h"
 #include "exceptions.h"
@@ -47,7 +46,7 @@
  */
 template<class K, class V>
 LMDBAL::Storage<K, V>::Storage(Base* parent, const std::string& name, bool duplicates):
-    iStorage(parent, name, duplicates),
+    StorageCommon(parent, name, duplicates),
     keySerializer(),
     valueSerializer(),
     cursors()
@@ -1016,7 +1015,7 @@ void LMDBAL::Storage<K, V>::close() {
     for (const std::pair<const uint32_t, Cursor<K, V>*>& pair : cursors)
         pair.second->terminated();
 
-    iStorage::close();
+    StorageCommon::close();
 }
 
 /**
@@ -1052,7 +1051,7 @@ void LMDBAL::Storage<K, V>::destroyCursor(LMDBAL::Cursor<K, V>& cursor) {
 
     cursor.close();
     cursors.erase(itr);
-    cursor.freed();
+    cursor.reset();
 }
 
 /**
@@ -1104,83 +1103,3 @@ void LMDBAL::Storage<K, V>::discoveredRecord(const K& key, const V& value, Trans
     UNUSED(value);
     UNUSED(txn);
 }
-
-/**
- * \brief A functiion to actually open <a class="el" href="http://www.lmdb.tech/doc/group__mdb.html#gadbe68a06c448dfb62da16443d251a78b">MDB_dbi</a> storage
- *
- * \tparam K type of keys in opening storage
- *
- * \param[in] transaction   - lmdb transaction to call <a class="el" href="http://www.lmdb.tech/doc/group__mdb.html#gac08cad5b096925642ca359a6d6f0562a">mdb_dbi_open</a>, must be a writable transaction!
- * \param[in] duplicates    - true if key duplicates are allowed (false by default)
- *
- * \returns MDB_SUCCESS if everything went smooth or MDB_<error> -like error code
- *
- * This is a way to optimise database using MDB_INTEGERKEY flag,
- * when the key is actually kind of an integer
- * This infrastructure also allowes us to customize mdb_dbi_open call in the future
- */
-template<class K, class V>
-inline int LMDBAL::iStorage::makeStorage(MDB_txn* transaction, bool duplicates) {
-    unsigned int flags = MDB_CREATE;
-    if constexpr (std::is_integral<K>::value)
-        flags |= MDB_INTEGERKEY;
-
-    if (duplicates) {
-        flags |= MDB_DUPSORT;
-
-        if constexpr (std::is_scalar<V>::value)
-            flags |= MDB_DUPFIXED;
-
-        if constexpr (
-            std::is_same<V, uint32_t>::value ||
-            std::is_same<V, int32_t>::value ||
-            std::is_same<V, uint64_t>::value ||
-            std::is_same<V, int64_t>::value
-        )                                   //for some reason lmdb breaks if it's not one of these types in MDB_DUPFIXED mode
-            flags |= MDB_INTEGERDUP;
-    }
-
-    return _mdbOpen(transaction, flags);
-}
-
-/**
- * \brief A method to cast a value (which can be a value or a key) to string.
- *
- * This function is mainly used in exceptions, to report which key was duplicated or not found.
- * You can define your own specializations to this function in case std::to_string doesn't cover your case
- *
- * \param[in]   value   a value that should be converted to string
- * \returns     a string presentation of value
- */
-template<class T>
-inline std::string LMDBAL::iStorage::toString(const T& value) {
-    return std::to_string(value);
-}
-
-/**
- * \brief A method to cast a value (which can be a value or a key) to string.
- *
- * QString spectialization
- *
- * \param[in]   value   a value that should be converted to string
- * \returns     a string presentation of value
- */
-template<>
-inline std::string LMDBAL::iStorage::toString(const QString& value) {
-    return value.toStdString();
-}
-
-/**
- * \brief A method to cast a value (which can be a value or a key) to string.
- *
- * std::string spectialization
- *
- * \param[in]   value   a value that should be converted to string
- * \returns     a string presentation of value
- */
-template<>
-inline std::string LMDBAL::iStorage::toString(const std::string& value) {
-    return value;
-}
-
-#endif //LMDBAL_STORAGE_HPP

src/storagecommon.cpp

@@ -16,18 +16,20 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "storage.h"
+#include "storagecommon.h"
+
+#include "cursorcommon.h"
 
 #define UNUSED(x) (void)(x)
 
 /**
- * \class LMDBAL::iStorage
+ * \class LMDBAL::StorageCommon
  *
  * \brief Storage interface
  *
- * This is a interface-like class, it's designed to be an inner database interface to
- * be used as a polymorphic entity, and provide protected interaction with the database
- * from the heirs code
+ * This is an interface-like class, it's designed to be an inner database interface to
+ * be used as a polymorphic entity and provide protected interaction with the database
+ * from the heir code
  */
 
 /**
@@ -37,7 +39,7 @@
  * \param[in]   name        - the name of the storage
  * \param[in]   duplicates  - true if key duplicates are allowed (false by default)
  */
-LMDBAL::iStorage::iStorage(Base* parent, const std::string& name, bool duplicates):
+LMDBAL::StorageCommon::StorageCommon(Base* parent, const std::string& name, bool duplicates):
     dbi(),
     db(parent),
     name(name),
@@ -47,12 +49,12 @@ LMDBAL::iStorage::iStorage(Base* parent, const std::string& name, bool duplicate
 /**
  * \brief Destroys a storage interface
  */
-LMDBAL::iStorage::~iStorage() {}
+LMDBAL::StorageCommon::~StorageCommon () = default;
 
 /**
- * \brief A private virtual function I need to close each storage in the database
+ * \brief A private virtual function to close each storage in the database
  */
-void LMDBAL::iStorage::close() {
+void LMDBAL::StorageCommon::close() {
     mdb_dbi_close(db->environment, dbi);
 }
 
@@ -67,7 +69,7 @@ void LMDBAL::iStorage::close() {
  *
  * \exception LMDBAL::TransactionTerminated     thrown if the passed transaction not active, any action with it's inner ID is an error
  */
-LMDBAL::TransactionID LMDBAL::iStorage::extractTransactionId(const Transaction& txn, const std::string& action) const {
+LMDBAL::TransactionID LMDBAL::StorageCommon::extractTransactionId(const Transaction& txn, const std::string& action) const {
     if (!txn.isActive())
         throw TransactionTerminated(db->name, name, action);
 
@@ -82,11 +84,11 @@ LMDBAL::TransactionID LMDBAL::iStorage::extractTransactionId(const Transaction&
  * \exception LMDBAL::Closed    thrown if the database was closed
  * \exception LMDBAL::Unknown   thrown if something unexpected happened
  */
-void LMDBAL::iStorage::drop() {
+void LMDBAL::StorageCommon::drop() {
     ensureOpened(dropMethodName);
 
     TransactionID txn = beginTransaction();
-    int rc = iStorage::drop(txn);
+    int rc = StorageCommon::drop(txn);
     if (rc != MDB_SUCCESS) {
         abortTransaction(txn);
         throw Unknown(db->name, mdb_strerror(rc), name);
@@ -101,10 +103,10 @@ void LMDBAL::iStorage::drop() {
  *
  * Just performs content drop
  *
- * \param[in] transaction   - transaction ID, must be writable transaction!
+ * \param[in] transaction   - transaction ID; must be writable transaction!
  * \returns MDB_SUCCESS if everything went fine, MDB_<error> code otherwise
  */
-int LMDBAL::iStorage::drop(TransactionID transaction) {
+int LMDBAL::StorageCommon::drop(TransactionID transaction) {
     return mdb_drop(transaction, dbi, 0);
 }
 
@@ -113,24 +115,24 @@ int LMDBAL::iStorage::drop(TransactionID transaction) {
  *
  * Just performs content drop
  *
- * \param[in] txn   - transaction ID, must be writable transaction!
+ * \param[in] txn   - transaction ID; must be writable transaction!
  * \returns MDB_SUCCESS if everything went fine, MDB_<error> code otherwise
  *
  * \exception LMDBAL::TransactionTerminated   thrown if the transaction was not active
  */
-int LMDBAL::iStorage::drop(const WriteTransaction& txn) {
+int LMDBAL::StorageCommon::drop(const WriteTransaction& txn) {
     ensureOpened(dropMethodName);
     return drop(extractTransactionId(txn, dropMethodName));
 }
 
 /**
- * \brief Helper function, thows exception if the database is not opened
+ * \brief Helper function; throws an exception if the database is not opened
  *
  * \param[in] methodName    - name of the method this function is called from, just for display in std::exception::what() message
  *
  * \exception LMDBAL::Closed    thrown if the database was closed
  */
-void LMDBAL::iStorage::ensureOpened(const std::string& methodName) const {
+void LMDBAL::StorageCommon::ensureOpened(const std::string& methodName) const {
     if (!isDBOpened())
         throw Closed(methodName, db->name, name);
 }
@@ -138,12 +140,12 @@ void LMDBAL::iStorage::ensureOpened(const std::string& methodName) const {
 /**
  * \brief Storage size
  *
- * \returns amount of records in the storage
+ * \returns number of records in the storage
  *
  * \exception LMDBAL::Closed    thrown if the database was closed
  * \exception LMDBAL::Unknown   thrown if something unexpected happened
  */
-LMDBAL::SizeType LMDBAL::iStorage::count() const {
+LMDBAL::SizeType LMDBAL::StorageCommon::count() const {
     ensureOpened(countMethodName);
 
     TransactionID txn = beginReadOnlyTransaction();
@@ -159,34 +161,94 @@ LMDBAL::SizeType LMDBAL::iStorage::count() const {
     return amount;
 }
 
+/**
+ * \brief Retrieves a public transaction object for a cursor handle
+ *
+ * Cursor must be still opened by a public transaction
+ *
+ * \param[out] cursor   - cursor handle
+ *
+ * \exception std::out_of_range     thrown if LMDBAL::Transaction pointer wasn't found in the LMDBAL::Base
+ */
+LMDBAL::Transaction* LMDBAL::StorageCommon::getTransactionForCursor (MDB_cursor* cursor) const {
+    TransactionID txnID = _mdbCursorTxn(cursor);
+    return db->transactions.at(txnID);
+}
+
+/**
+ * \brief Opens a transaction that is ment to be private to LMDBAL::Cursor, but public to the LMDBAL::Storage
+ *
+ * This method is ment to be called from LMDBAL::Cursor
+ *
+ * \param[out] cursor   - cursor handle
+ * \param[in]  renew    - true if instead of opening cursor should be renewed
+ *
+ * \exception LMDBAL::Closed        thrown if you try to open the cursor on a closed database
+ * \exception LMDBAL::Unknown       thrown if there was a problem opening the cursor by the lmdb, or to begin a transaction
+ */
+void LMDBAL::StorageCommon::openCursorTransaction (MDB_cursor** cursor, bool renew) const {
+    ensureOpened(openCursorTransactionMethodName);
+
+    TransactionID txn = beginReadOnlyTransaction();
+    int result;
+    if (renew)
+        result = _mdbCursorRenew(txn, *cursor);
+    else
+        result = _mdbCursorOpen(txn, cursor);
+
+    if (result != MDB_SUCCESS)
+        throwUnknown(result, txn);
+
+    transactionStarted(txn, true);
+}
+
+/**
+ * \brief Closes transaction that is private to LMDBAL::Cursor, but public to the LMDBAL::Storage
+ *
+ * This method is ment to be called from LMDBAL::Cursor
+ *
+ * \param[in] cursor        - cursor handle
+ * \param[in] closeCursor   - true if the cursor should also get closed, false if you wish to leave it open
+ */
+void LMDBAL::StorageCommon::closeCursorTransaction (MDB_cursor* cursor, bool closeCursor) const {
+    TransactionID txn = _mdbCursorTxn(cursor);
+    if (closeCursor)
+        _mdbCursorClose(cursor);
+
+    abortTransaction(txn);
+    transactionAborted(txn);
+}
+
 /**
  * \brief Storage size (private transaction variant)
  *
- * \param[in] txn   - transaction ID, can be read-only transaction
- * \returns amount of records in the storage
+ * \param[in] txn   - transaction ID; can be read-only transaction
+ * \returns number of records in the storage
  *
  * \exception LMDBAL::Unknown   thrown if something unexpected happened
  */
-LMDBAL::SizeType LMDBAL::iStorage::count(TransactionID txn) const {
+LMDBAL::SizeType LMDBAL::StorageCommon::count(TransactionID txn) const {
     MDB_stat stat;
-    int rc = mdb_stat(txn, dbi, &stat);
-    if (rc != MDB_SUCCESS)
+    if (const int rc = mdb_stat(txn, dbi, &stat); rc != MDB_SUCCESS)
         throw Unknown(db->name, mdb_strerror(rc), name);
 
-    return stat.ms_entries;
+    if (stat.ms_entries > std::numeric_limits<SizeType>::max())
+        throw Unknown(db->name, "Storage size exceeds it's limits", name);
+
+    return static_cast<SizeType>(stat.ms_entries);
 }
 
 /**
  * \brief Storage size (public transaction variant)
  *
- * \param[in] txn   - transaction, can be read-only transaction
- * \returns amount of records in the storage
+ * \param[in] txn   - transaction; can be read-only transaction
+ * \returns number of records in the storage
  *
  * \exception LMDBAL::Closed                    thrown if the database was closed
  * \exception LMDBAL::Unknown                   thrown if something unexpected happened
  * \exception LMDBAL::TransactionTerminated     thrown if the passed transaction not active, any action with it's inner ID is an error
  */
-LMDBAL::SizeType LMDBAL::iStorage::count(const Transaction& txn) const {
+LMDBAL::SizeType LMDBAL::StorageCommon::count(const Transaction& txn) const {
     ensureOpened(countMethodName);
     return count(extractTransactionId(txn, countMethodName));
 }
@@ -203,7 +265,7 @@ LMDBAL::SizeType LMDBAL::iStorage::count(const Transaction& txn) const {
  * \exception LMDBAL::Exist     thrown if rc == MDB_KEYEXIST
  * \exception LMDBAL::Unknown   thrown if rc != MDB_KEYEXIST
  */
-void LMDBAL::iStorage::throwDuplicateOrUnknown(int rc, TransactionID txn, const std::string& key) const {
+void LMDBAL::StorageCommon::throwDuplicateOrUnknown(int rc, TransactionID txn, const std::string& key) const {
     abortTransaction(txn);
     throwDuplicateOrUnknown(rc, key);
 }
@@ -220,7 +282,7 @@ void LMDBAL::iStorage::throwDuplicateOrUnknown(int rc, TransactionID txn, const
  * \exception LMDBAL::NotFound  thrown if rc == MDB_NOTFOUND
  * \exception LMDBAL::Unknown   thrown if rc != MDB_NOTFOUND
  */
-void LMDBAL::iStorage::throwNotFoundOrUnknown(int rc, LMDBAL::TransactionID txn, const std::string& key) const {
+void LMDBAL::StorageCommon::throwNotFoundOrUnknown(int rc, LMDBAL::TransactionID txn, const std::string& key) const {
     abortTransaction(txn);
     throwNotFoundOrUnknown(rc, key);
 }
@@ -236,7 +298,7 @@ void LMDBAL::iStorage::throwNotFoundOrUnknown(int rc, LMDBAL::TransactionID txn,
  * \exception LMDBAL::Exist     thrown if rc == MDB_KEYEXIST
  * \exception LMDBAL::Unknown   thrown if rc != MDB_KEYEXIST
  */
-void LMDBAL::iStorage::throwDuplicateOrUnknown(int rc, const std::string& key) const {
+void LMDBAL::StorageCommon::throwDuplicateOrUnknown(int rc, const std::string& key) const {
     if (rc == MDB_KEYEXIST)
         throwDuplicate(key);
     else
@@ -254,7 +316,7 @@ void LMDBAL::iStorage::throwDuplicateOrUnknown(int rc, const std::string& key) c
  * \exception LMDBAL::NotFound  thrown if rc == MDB_NOTFOUND
  * \exception LMDBAL::Unknown   thrown if rc != MDB_NOTFOUND
  */
-void LMDBAL::iStorage::throwNotFoundOrUnknown(int rc, const std::string& key) const {
+void LMDBAL::StorageCommon::throwNotFoundOrUnknown(int rc, const std::string& key) const {
     if (rc == MDB_NOTFOUND)
         throwNotFound(key);
     else
@@ -271,7 +333,7 @@ void LMDBAL::iStorage::throwNotFoundOrUnknown(int rc, const std::string& key) co
  *
  * \exception LMDBAL::Unknown   thrown everytime
  */
-void LMDBAL::iStorage::throwUnknown(int rc, LMDBAL::TransactionID txn) const {
+void LMDBAL::StorageCommon::throwUnknown(int rc, LMDBAL::TransactionID txn) const {
     abortTransaction(txn);
     throwUnknown(rc);
 }
@@ -283,7 +345,7 @@ void LMDBAL::iStorage::throwUnknown(int rc, LMDBAL::TransactionID txn) const {
  *
  * \returns database name
  */
-const std::string & LMDBAL::iStorage::dbName() const {
+const std::string & LMDBAL::StorageCommon::dbName() const {
     return db->name;}
 
 /**
@@ -293,8 +355,8 @@ const std::string & LMDBAL::iStorage::dbName() const {
  *
  * \returns true if database is ipened, false otherwise
  */
-bool LMDBAL::iStorage::isDBOpened() const {
-    return db->opened;}
+bool LMDBAL::StorageCommon::isDBOpened() const {
+    return db->opened();}
 
 /**
  * \brief Throws LMDBAL::Unknown
@@ -305,7 +367,7 @@ bool LMDBAL::iStorage::isDBOpened() const {
  *
  * \exception LMDBAL::Unknown   thrown everytime
  */
-void LMDBAL::iStorage::throwUnknown(int rc) const {
+void LMDBAL::StorageCommon::throwUnknown(int rc) const {
     throw Unknown(db->name, mdb_strerror(rc), name);}
 
 /**
@@ -317,7 +379,7 @@ void LMDBAL::iStorage::throwUnknown(int rc) const {
  *
  * \exception LMDBAL::Unknown   thrown everytime
  */
-void LMDBAL::iStorage::throwUnknown(const std::string& message) const {
+void LMDBAL::StorageCommon::throwUnknown(const std::string& message) const {
     throw Unknown(db->name, message, name);}
 
 /**
@@ -329,7 +391,7 @@ void LMDBAL::iStorage::throwUnknown(const std::string& message) const {
  *
  * \exception LMDBAL::Exist   thrown everytime
  */
-void LMDBAL::iStorage::throwDuplicate(const std::string& key) const {
+void LMDBAL::StorageCommon::throwDuplicate(const std::string& key) const {
     throw Exist(key, db->name, name);}
 
 /**
@@ -341,7 +403,7 @@ void LMDBAL::iStorage::throwDuplicate(const std::string& key) const {
  *
  * \exception LMDBAL::NotFound   thrown everytime
  */
-void LMDBAL::iStorage::throwNotFound(const std::string& key) const {
+void LMDBAL::StorageCommon::throwNotFound(const std::string& key) const {
     throw NotFound(key, db->name, name);}
 
 /**
@@ -353,7 +415,7 @@ void LMDBAL::iStorage::throwNotFound(const std::string& key) const {
  *
  * \exception LMDBAL::CursorNotReady   thrown everytime
  */
-void LMDBAL::iStorage::throwCursorNotReady(const std::string& method) const {
+void LMDBAL::StorageCommon::throwCursorNotReady(const std::string& method) const {
     throw CursorNotReady(method, db->name, name);}
 
 /**
@@ -363,7 +425,7 @@ void LMDBAL::iStorage::throwCursorNotReady(const std::string& method) const {
  *
  * \returns read only transaction
  */
-LMDBAL::TransactionID LMDBAL::iStorage::beginReadOnlyTransaction() const {
+LMDBAL::TransactionID LMDBAL::StorageCommon::beginReadOnlyTransaction() const {
     return db->beginPrivateReadOnlyTransaction(name);}
 
 /**
@@ -373,7 +435,7 @@ LMDBAL::TransactionID LMDBAL::iStorage::beginReadOnlyTransaction() const {
  *
  * \returns read only transaction
  */
-LMDBAL::TransactionID LMDBAL::iStorage::beginTransaction() const {
+LMDBAL::TransactionID LMDBAL::StorageCommon::beginTransaction() const {
     return db->beginPrivateTransaction(name);}
 
 /**
@@ -381,7 +443,7 @@ LMDBAL::TransactionID LMDBAL::iStorage::beginTransaction() const {
  *
  * Ment to be called from heirs, name is reported to the database just to be displayed in std::exception::what() message
  */
-void LMDBAL::iStorage::abortTransaction(LMDBAL::TransactionID id) const {
+void LMDBAL::StorageCommon::abortTransaction(LMDBAL::TransactionID id) const {
     db->abortPrivateTransaction(id, name);}
 
 /**
@@ -391,7 +453,7 @@ void LMDBAL::iStorage::abortTransaction(LMDBAL::TransactionID id) const {
  *
  * \exception LMDBAL::Unknown   thrown if something unexpected happened
  */
-void LMDBAL::iStorage::commitTransaction(LMDBAL::TransactionID id) {
+void LMDBAL::StorageCommon::commitTransaction(LMDBAL::TransactionID id) {
     db->commitPrivateTransaction(id, name);}
 
 /**
@@ -406,7 +468,7 @@ void LMDBAL::iStorage::commitTransaction(LMDBAL::TransactionID id) {
  * \param[in] txn       - ID of started transaction
  * \param[in] readOnly  - true if transaction is read-only, false otherwise
  */
-void LMDBAL::iStorage::transactionStarted(LMDBAL::TransactionID txn, bool readOnly) const {
+void LMDBAL::StorageCommon::transactionStarted(LMDBAL::TransactionID txn, bool readOnly) const {
     UNUSED(txn);
     UNUSED(readOnly);
 }
@@ -422,7 +484,7 @@ void LMDBAL::iStorage::transactionStarted(LMDBAL::TransactionID txn, bool readOn
  *
  * \param[in] txn       - ID of started transaction
  */
-void LMDBAL::iStorage::transactionCommited(LMDBAL::TransactionID txn) {
+void LMDBAL::StorageCommon::transactionCommited(LMDBAL::TransactionID txn) {
     UNUSED(txn);}
 
 /**
@@ -436,7 +498,7 @@ void LMDBAL::iStorage::transactionCommited(LMDBAL::TransactionID txn) {
  *
  * \param[in] txn       - ID of started transaction
  */
-void LMDBAL::iStorage::transactionAborted(LMDBAL::TransactionID txn) const {
+void LMDBAL::StorageCommon::transactionAborted(LMDBAL::TransactionID txn) const {
     UNUSED(txn);}
 
 /**
@@ -445,65 +507,64 @@ void LMDBAL::iStorage::transactionAborted(LMDBAL::TransactionID txn) const {
  * It's a protected method that is called to optimise drop process
  * after the transaction is commited. Used just for optimisations.
  */
-void LMDBAL::iStorage::handleDrop() {}
+void LMDBAL::StorageCommon::handleDrop() {}
 
-int LMDBAL::iStorage::_mdbOpen(MDB_txn *txn, unsigned int flags) {
+int LMDBAL::StorageCommon::_mdbOpen(MDB_txn *txn, unsigned int flags) {
     return mdb_dbi_open(txn, name.c_str(), flags, &dbi);
 }
 
-int LMDBAL::iStorage::_mdbPut(MDB_txn* txn, MDB_val& key, MDB_val& data, unsigned int flags) {
+int LMDBAL::StorageCommon::_mdbPut(MDB_txn* txn, MDB_val& key, MDB_val& data, unsigned int flags) {
     return mdb_put(txn, dbi, &key, &data, flags);
 }
 
-int LMDBAL::iStorage::_mdbGet(MDB_txn* txn, MDB_val& key, MDB_val& data) const {
+int LMDBAL::StorageCommon::_mdbGet(MDB_txn* txn, MDB_val& key, MDB_val& data) const {
     return mdb_get(txn, dbi, &key, &data);
 }
 
-int LMDBAL::iStorage::_mdbDel(MDB_txn* txn, MDB_val& key) {
+int LMDBAL::StorageCommon::_mdbDel(MDB_txn* txn, MDB_val& key) {
     return mdb_del(txn, dbi, &key, NULL);
 }
 
-int LMDBAL::iStorage::_mdbDel(MDB_txn* txn, MDB_val& key, MDB_val& data) {
+int LMDBAL::StorageCommon::_mdbDel(MDB_txn* txn, MDB_val& key, MDB_val& data) {
     return mdb_del(txn, dbi, &key, &data);
 }
 
-int LMDBAL::iStorage::_mdbStat(MDB_txn* txn, MDB_stat& stat) const {
+int LMDBAL::StorageCommon::_mdbStat(MDB_txn* txn, MDB_stat& stat) const {
     return mdb_stat(txn, dbi, &stat);
 }
 
-int LMDBAL::iStorage::_mdbFlags(MDB_txn* txn, uint32_t& flags) const {
+int LMDBAL::StorageCommon::_mdbFlags(MDB_txn* txn, uint32_t& flags) const {
     return mdb_dbi_flags(txn, dbi, &flags);
 }
 
-
-int LMDBAL::iStorage::_mdbCursorOpen(MDB_txn* txn, MDB_cursor** cursor) const {
+int LMDBAL::StorageCommon::_mdbCursorOpen(MDB_txn* txn, MDB_cursor** cursor) const {
     return mdb_cursor_open(txn, dbi, cursor);
 }
 
-void LMDBAL::iStorage::_mdbCursorClose(MDB_cursor *cursor) const {
+void LMDBAL::StorageCommon::_mdbCursorClose(MDB_cursor *cursor) const {
     mdb_cursor_close(cursor);
 }
 
-int LMDBAL::iStorage::_mdbCursorGet(MDB_cursor* cursor, MDB_val& key, MDB_val& data, MDB_cursor_op operation) const {
+int LMDBAL::StorageCommon::_mdbCursorGet(MDB_cursor* cursor, MDB_val& key, MDB_val& data, MDB_cursor_op operation) const {
     return mdb_cursor_get(cursor, &key, &data, operation);
 }
 
-int LMDBAL::iStorage::_mdbCursorSet(MDB_cursor* cursor, MDB_val& key) const {
+int LMDBAL::StorageCommon::_mdbCursorSet(MDB_cursor* cursor, MDB_val& key) const {
     return mdb_cursor_get(cursor, &key, NULL, MDB_SET);
 }
 
-int LMDBAL::iStorage::_mdbCursorDel(MDB_cursor* cursor, unsigned int flags) {
+int LMDBAL::StorageCommon::_mdbCursorDel(MDB_cursor* cursor, unsigned int flags) {
     return mdb_cursor_del(cursor, flags);
 }
 
-int LMDBAL::iStorage::_mdbCursorPut(MDB_cursor* cursor, MDB_val& key, MDB_val& data, unsigned int flags) {
+int LMDBAL::StorageCommon::_mdbCursorPut(MDB_cursor* cursor, MDB_val& key, MDB_val& data, unsigned int flags) {
     return mdb_cursor_put(cursor, &key, &data, flags);
 }
 
-int LMDBAL::iStorage::_mdbCursorRenew(MDB_txn* txn, MDB_cursor* cursor) const {
+int LMDBAL::StorageCommon::_mdbCursorRenew(MDB_txn* txn, MDB_cursor* cursor) const {
     return mdb_cursor_renew(txn, cursor);
 }
 
-MDB_txn* LMDBAL::iStorage::_mdbCursorTxn(MDB_cursor* cursor) const {
+MDB_txn* LMDBAL::StorageCommon::_mdbCursorTxn(MDB_cursor* cursor) const {
     return mdb_cursor_txn(cursor);
 }

src/storagecommon.h

@@ -0,0 +1,139 @@
+/*
+ * LMDB Abstraction Layer.
+ * Copyright (C) 2023  Yury Gubich <blue@macaw.me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <string>
+#include <cstdint>
+
+#include <lmdb.h>
+
+#include "base.h"
+#include "transaction.h"
+
+namespace LMDBAL {
+
+class CursorCommon;
+
+class StorageCommon {
+    friend class Base;
+    friend class CursorCommon;
+public:
+protected:
+    StorageCommon(Base* parent, const std::string& name, bool duplicates = false);
+    virtual ~ StorageCommon();
+
+    /**
+    * \brief A private virtual function I need to open each storage in the database
+    *
+    * \param[in] transaction   - lmdb transaction to call <a class="el" href="http://www.lmdb.tech/doc/group__mdb.html#gac08cad5b096925642ca359a6d6f0562a">mdb_dbi_open</a>
+    * \returns MDB_SUCCESS if everything went smooth or MDB_<error> -like error code
+    */
+    virtual int open(MDB_txn * transaction) = 0;
+    virtual void close();
+    virtual void handleDrop();
+
+    bool isDBOpened() const;
+    const std::string& dbName() const;
+
+    void ensureOpened(const std::string& methodName) const;
+    void throwDuplicateOrUnknown(int rc, const std::string& key) const;
+    void throwDuplicateOrUnknown(int rc, TransactionID txn, const std::string& key) const;
+    void throwNotFoundOrUnknown(int rc, const std::string& key) const;
+    void throwNotFoundOrUnknown(int rc, TransactionID txn, const std::string& key) const;
+    void throwUnknown(int rc, TransactionID txn) const;
+    void throwUnknown(int rc) const;
+    void throwUnknown(const std::string& message) const;
+    void throwDuplicate(const std::string& key) const;
+    void throwNotFound(const std::string& key) const;
+    void throwCursorNotReady(const std::string& method) const;
+
+    TransactionID extractTransactionId(const Transaction& txn, const std::string& action = "") const;
+    TransactionID beginReadOnlyTransaction() const;
+    TransactionID beginTransaction() const;
+    void commitTransaction(TransactionID id);
+    void abortTransaction(TransactionID id) const;
+    virtual void transactionStarted(TransactionID txn, bool readOnly) const;
+    virtual void transactionCommited(TransactionID txn);
+    virtual void transactionAborted(TransactionID txn) const;
+    virtual int drop(TransactionID transaction);
+    virtual SizeType count(TransactionID txn) const;
+
+    Transaction* getTransactionForCursor(MDB_cursor* cursor) const;
+
+    void openCursorTransaction(MDB_cursor** cursor, bool renew = false) const;
+    void closeCursorTransaction(MDB_cursor* cursor, bool closeCursor = false) const;
+
+    int _mdbOpen(MDB_txn* txn, unsigned int flags = 0);
+
+    int _mdbPut(MDB_txn* txn, MDB_val& key, MDB_val& data, unsigned int flags = 0);
+    int _mdbGet(MDB_txn* txn, MDB_val& key, MDB_val& data) const;
+    int _mdbDel(MDB_txn* txn, MDB_val& key);
+    int _mdbDel(MDB_txn* txn, MDB_val& key, MDB_val& data);
+
+    int _mdbStat(MDB_txn* txn, MDB_stat& stat) const;
+    int _mdbFlags(MDB_txn* txn, uint32_t& flags) const;
+
+    int _mdbCursorOpen(MDB_txn* txn, MDB_cursor** cursor) const;
+    void _mdbCursorClose(MDB_cursor* cursor) const;
+    int _mdbCursorGet(MDB_cursor* cursor, MDB_val& key, MDB_val& data, MDB_cursor_op operation) const;
+    int _mdbCursorSet(MDB_cursor* cursor, MDB_val& key) const;
+    int _mdbCursorDel(MDB_cursor* cursor, unsigned int flags = 0);
+    int _mdbCursorPut(MDB_cursor* cursor, MDB_val& key, MDB_val& data, unsigned int flags = 0);
+
+    int _mdbCursorRenew(MDB_txn* txn, MDB_cursor* cursor) const;
+    MDB_txn* _mdbCursorTxn(MDB_cursor* cursor) const;
+
+public:
+    virtual void drop();
+    virtual int drop(const WriteTransaction& txn);
+    virtual SizeType count() const;
+    virtual SizeType count(const Transaction& txn) const;
+
+protected:
+    MDB_dbi dbi;                /**<\brief lmdb storage handle*/
+    Base* db;                   /**<\brief parent database pointer (borrowed)*/
+    const std::string name;     /**<\brief this storage name*/
+    const bool duplicates;      /**<\brief true if storage supports duplicates*/
+
+    inline static const std::string dropMethodName = "drop";                                    /**<\brief member function name, just for exceptions*/
+    inline static const std::string countMethodName = "count";                                  /**<\brief member function name, just for exceptions*/
+    inline static const std::string flagsMethodName = "flags";                                  /**<\brief member function name, just for exceptions*/
+
+    inline static const std::string addRecordMethodName = "addRecord";                          /**<\brief member function name, just for exceptions*/
+    inline static const std::string forceRecordMethodName = "forceRecord";                      /**<\brief member function name, just for exceptions*/
+    inline static const std::string changeRecordMethodName = "changeRecord";                    /**<\brief member function name, just for exceptions*/
+    inline static const std::string removeRecordMethodName = "removeRecord";                    /**<\brief member function name, just for exceptions*/
+    inline static const std::string checkRecordMethodName = "checkRecord";                      /**<\brief member function name, just for exceptions*/
+    inline static const std::string getRecordMethodName = "getRecord";                          /**<\brief member function name, just for exceptions*/
+    inline static const std::string readAllMethodName = "readAllRecord";                        /**<\brief member function name, just for exceptions*/
+    inline static const std::string replaceAllMethodName = "replaceAll";                        /**<\brief member function name, just for exceptions*/
+    inline static const std::string addRecordsMethodName = "addRecords";                        /**<\brief member function name, just for exceptions*/
+    inline static const std::string openCursorTransactionMethodName = "openCursorTransaction";  /**<\brief member function name, just for exceptions*/
+
+protected:
+    template <class K, class V>
+    int makeStorage(MDB_txn* transaction, bool duplicates = false);
+
+    template <class T>
+    static std::string toString(const T& value);
+};
+
+}
+
+#include "storagecommon.hpp"

src/storagecommon.hpp

@@ -0,0 +1,99 @@
+/*
+ * LMDB Abstraction Layer.
+ * Copyright (C) 2023  Yury Gubich <blue@macaw.me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "storagecommon.h"
+
+/**
+ * \brief A functiion to actually open <a class="el" href="http://www.lmdb.tech/doc/group__mdb.html#gadbe68a06c448dfb62da16443d251a78b">MDB_dbi</a> storage
+ *
+ * \tparam K type of keys in opening storage
+ *
+ * \param[in] transaction   - lmdb transaction to call <a class="el" href="http://www.lmdb.tech/doc/group__mdb.html#gac08cad5b096925642ca359a6d6f0562a">mdb_dbi_open</a>, must be a writable transaction!
+ * \param[in] duplicates    - true if key duplicates are allowed (false by default)
+ *
+ * \returns MDB_SUCCESS if everything went smooth or MDB_<error> -like error code
+ *
+ * This is a way to optimise database using MDB_INTEGERKEY flag,
+ * when the key is actually kind of an integer
+ * This infrastructure also allowes us to customize mdb_dbi_open call in the future
+ */
+template<class K, class V>
+inline int LMDBAL::StorageCommon::makeStorage(MDB_txn* transaction, bool duplicates) {
+    unsigned int flags = MDB_CREATE;
+    if constexpr (std::is_integral<K>::value)
+        flags |= MDB_INTEGERKEY;
+
+    if (duplicates) {
+        flags |= MDB_DUPSORT;
+
+        if constexpr (std::is_scalar<V>::value)
+            flags |= MDB_DUPFIXED;
+
+        if constexpr (
+            std::is_same<V, uint32_t>::value ||
+            std::is_same<V, int32_t>::value ||
+            std::is_same<V, uint64_t>::value ||
+            std::is_same<V, int64_t>::value
+        )                                   //for some reason lmdb breaks if it's not one of these types in MDB_DUPFIXED mode
+            flags |= MDB_INTEGERDUP;
+    }
+
+    return _mdbOpen(transaction, flags);
+}
+
+/**
+ * \brief A method to cast a value (which can be a value or a key) to string.
+ *
+ * This function is mainly used in exceptions, to report which key was duplicated or not found.
+ * You can define your own specializations to this function in case std::to_string doesn't cover your case
+ *
+ * \param[in]   value   a value that should be converted to string
+ * \returns     a string presentation of value
+ */
+template<class T>
+inline std::string LMDBAL::StorageCommon::toString(const T& value) {
+    return std::to_string(value);
+}
+
+/**
+ * \brief A method to cast a value (which can be a value or a key) to string.
+ *
+ * QString spectialization
+ *
+ * \param[in]   value   a value that should be converted to string
+ * \returns     a string presentation of value
+ */
+template<>
+inline std::string LMDBAL::StorageCommon::toString(const QString& value) {
+    return value.toStdString();
+}
+
+/**
+ * \brief A method to cast a value (which can be a value or a key) to string.
+ *
+ * std::string spectialization
+ *
+ * \param[in]   value   a value that should be converted to string
+ * \returns     a string presentation of value
+ */
+template<>
+inline std::string LMDBAL::StorageCommon::toString(const std::string& value) {
+    return value;
+}

src/transaction.cpp

@@ -1,5 +1,25 @@
+/*
+ * LMDB Abstraction Layer.
+ * Copyright (C) 2023  Yury Gubich <blue@macaw.me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 #include "transaction.h"
 
+#include "cursorcommon.h"
+
 /**
  * \class LMDBAL::Transaction
  * \brief Public read only transaction
@@ -22,7 +42,8 @@
 LMDBAL::Transaction::Transaction():
     txn(nullptr),
     active(false),
-    parent(nullptr)
+    parent(nullptr),
+    cursors()
 {}
 
 /**
@@ -31,8 +52,11 @@ LMDBAL::Transaction::Transaction():
 LMDBAL::Transaction::Transaction(TransactionID txn, const Base* parent) :
     txn(txn),
     active(true),
-    parent(parent)
-{}
+    parent(parent),
+    cursors()
+{
+    parent->transactions[txn] = this;
+}
 
 /**
  * \brief Moves transaction to a new object
@@ -40,9 +64,14 @@ LMDBAL::Transaction::Transaction(TransactionID txn, const Base* parent) :
 LMDBAL::Transaction::Transaction(Transaction&& other):
     txn(other.txn),
     active(other.active),
-    parent(other.parent)
+    parent(other.parent),
+    cursors(other.cursors)
 {
-    other.active = false;
+    if (active) {
+        parent->transactions[txn] = this;
+
+        other.reset();
+    }
 }
 
 /**
@@ -56,13 +85,21 @@ LMDBAL::Transaction::~Transaction() {
  * \brief Move-assigns transaction to the new object
  */
 LMDBAL::Transaction& LMDBAL::Transaction::operator=(Transaction&& other) {
+    if (this == &other)
+        return *this;
+
     terminate();
 
     txn = other.txn;
     active = other.active;
     parent = other.parent;
+    cursors = other.cursors;
 
-    other.active = false;
+    if (active) {
+        parent->transactions[txn] = this;
+
+        other.reset();
+    }
 
     return *this;
 }
@@ -74,11 +111,32 @@ LMDBAL::Transaction& LMDBAL::Transaction::operator=(Transaction&& other) {
  */
 void LMDBAL::Transaction::terminate() {
     if (active) {
+        closeCursors();
         parent->abortTransaction(txn);
-        active = false;
+        parent->transactions.erase(txn);
+        reset();
     }
 }
 
+
+/**
+ * \brief Resets inner transaction properties to inactive state
+ */
+void LMDBAL::Transaction::reset() {
+    active = false;
+    txn = nullptr;
+    parent = nullptr;
+    cursors.clear();
+}
+
+/**
+ * \brief Closes attached curors;
+ */
+void LMDBAL::Transaction::closeCursors () {
+    for (const std::pair<const uint32_t, CursorCommon*>& pair : cursors)
+        pair.second->terminated();
+}
+
 /**
  * \brief Returns transaction states
  *
@@ -132,6 +190,12 @@ LMDBAL::WriteTransaction::WriteTransaction(WriteTransaction&& other):
     Transaction(std::move(other))
 {}
 
+LMDBAL::WriteTransaction& LMDBAL::WriteTransaction::operator=(WriteTransaction&& other) {
+    Transaction::operator=(std::move(other));
+
+    return *this;
+}
+
 /**
  * \brief Aborts transaction cancelling all changes
  *
@@ -148,7 +212,9 @@ void LMDBAL::WriteTransaction::abort() {
  */
 void LMDBAL::WriteTransaction::commit() {
     if (active) {
+        closeCursors();
         const_cast<Base*>(parent)->commitTransaction(txn);
-        active = false;
+        parent->transactions.erase(txn);
+        reset();
     }
 }

src/transaction.h

@@ -1,13 +1,33 @@
+/*
+ * LMDB Abstraction Layer.
+ * Copyright (C) 2023  Yury Gubich <blue@macaw.me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 #pragma once
 
 #include "base.h"
 
 namespace LMDBAL {
-class iStorage;
+class StorageCommon;
+class CursorCommon;
 
 class Transaction {
     friend class Base;
-    friend class iStorage;
+    friend class StorageCommon;
+    friend class CursorCommon;
 public:
     explicit Transaction();
     explicit Transaction(Transaction&& other);
@@ -21,11 +41,14 @@ public:
 
 protected:
     Transaction(TransactionID txn, const Base* parent);
+    void reset();
+    void closeCursors();
 
 protected:
-    TransactionID txn;          /**<\brief Transaction inner handler*/
-    bool active;                /**<\brief Transaction state*/
-    const Base* parent;         /**<\brief Pointer to the database this transaction belongs to*/
+    TransactionID txn;                                  /**<\brief Transaction inner handler*/
+    bool active;                                        /**<\brief Transaction state*/
+    const Base* parent;                                 /**<\brief Pointer to the database this transaction belongs to*/
+    mutable std::map<uint32_t, CursorCommon*> cursors;  /**<\brief a collection of cursors curently opened under this transaction*/
 };
 
 class WriteTransaction : public Transaction {
@@ -35,6 +58,7 @@ public:
     explicit WriteTransaction(WriteTransaction&& other);
     WriteTransaction(const WriteTransaction& other) = delete;
     WriteTransaction& operator = (const WriteTransaction& other) = delete;
+    WriteTransaction& operator = (WriteTransaction&& other);
 
     void commit();
     void abort();

test/CMakeLists.txt

@@ -20,7 +20,7 @@ target_include_directories(runUnitTests PRIVATE ${Qt${QT_VERSION_MAJOR}Core_INCL
 target_link_libraries(
   runUnitTests
   GTest::gtest_main
-  ${PROJECT_NAME}
+  ${LMDBAL_NAME}
   Qt${QT_VERSION_MAJOR}::Core
 )
 include(GoogleTest)

test/basic.cpp

@@ -3,6 +3,7 @@
 #include "base.h"
 #include "storage.h"
 #include "cache.h"
+#include "session.h"
 
 #include <QString>
 #include <QVariant>
@@ -34,13 +35,14 @@ protected:
     }
 
     static void TearDownTestSuite() {
-        db->close();
+        session.close();
         db->removeDirectory();
         delete db;
         db = nullptr;
     }
 
     static LMDBAL::Base* db;
+    static LMDBAL::Session session;
 
     LMDBAL::Storage<uint32_t, uint32_t>* t1;
     LMDBAL::Storage<QString, QString>* t2;
@@ -50,19 +52,20 @@ protected:
 
 
 LMDBAL::Base* BaseTest::db = nullptr;
+LMDBAL::Session BaseTest::session;
 
 TEST_F(BaseTest, RemovingDirectory) {
     EXPECT_EQ(db->removeDirectory(), true);
 }
 
 TEST_F(BaseTest, OpeningClosingDatabase) {
-    EXPECT_EQ(db->ready(), false);
-    db->open();
-    EXPECT_EQ(db->ready(), true);
-    db->close();
-    EXPECT_EQ(db->ready(), false);
-    db->open();
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), false);
+    session = db->open();
+    EXPECT_EQ(db->opened(), true);
+    session.close();
+    EXPECT_EQ(db->opened(), false);
+    session = db->open();
+    EXPECT_EQ(db->opened(), true);
 }
 
 TEST_F(BaseTest, Flags) {
@@ -93,7 +96,7 @@ TEST_F(BaseTest, Flags) {
 }
 
 TEST_F(BaseTest, AddingIntegerKey) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
     t1->addRecord(1, 2);
     t1->addRecord(2, 2);
     t1->addRecord(3, 15);
@@ -101,7 +104,7 @@ TEST_F(BaseTest, AddingIntegerKey) {
 }
 
 TEST_F(BaseTest, AddingQStringKey) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
     t2->addRecord("hello", "world");
     t2->addRecord("aaa", "gagdfsdf");
     t2->addRecord("sdfhga", "DSFFDG");
@@ -110,17 +113,16 @@ TEST_F(BaseTest, AddingQStringKey) {
 }
 
 TEST_F(BaseTest, AddingKeysToCache) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
     c1->addRecord(2, "blah balah");
     c1->addRecord(-4, "testing goes brrr");
-    c1->addRecord(140, "whatever");
+    c1->addRecord(40, "whatever");
     c1->addRecord(-37, "aaaaa tss tsss tsss tsss aaaaaaa");
-    EXPECT_EQ(c1->getRecord(140), "whatever");
-    EXPECT_EQ(c1->getRecord(-116), "whatever");
+    EXPECT_EQ(c1->getRecord(40), "whatever");
 }
 
 TEST_F(BaseTest, AddingKeysToVariableCache) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
     c2->addRecord("regrets", "blah balah");
     c2->addRecord("fossil fingers", 842);
     c2->addRecord("preloaded cut", 539.75);
@@ -133,7 +135,7 @@ TEST_F(BaseTest, AddingKeysToVariableCache) {
 }
 
 TEST_F(BaseTest, AddingRepeatingKey) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
 
     EXPECT_THROW(t1->addRecord(3, 24), LMDBAL::Exist);
     EXPECT_EQ(t1->getRecord(3), 15);
@@ -149,7 +151,7 @@ TEST_F(BaseTest, AddingRepeatingKey) {
 }
 
 TEST_F(BaseTest, GettingNotExistingKeys) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
 
     EXPECT_THROW(t2->getRecord("almonds"), LMDBAL::NotFound);
     EXPECT_THROW(t1->getRecord(64), LMDBAL::NotFound);
@@ -158,21 +160,21 @@ TEST_F(BaseTest, GettingNotExistingKeys) {
 }
 
 TEST_F(BaseTest, Persistence) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
     uint32_t t1Size = t1->count();
     uint32_t t2Size = t2->count();
     uint32_t c1Size = c1->count();
     uint32_t c2Size = c2->count();
 
-    db->close();
     delete db;
+    EXPECT_EQ(session.opened(), false);
 
     db = new LMDBAL::Base("testBase");
     t1 = db->addStorage<uint32_t, uint32_t>("table1");
     t2 = db->addStorage<QString, QString>("table2");
     c1 = db->addCache<int8_t, std::string>("cache1");
     c2 = db->addCache<std::string, QVariant>("cache2");
-    db->open();
+    session = db->open();
 
     EXPECT_EQ(t1->count(), t1Size);
     EXPECT_EQ(t1->getRecord(3), 15);
@@ -189,8 +191,8 @@ TEST_F(BaseTest, Persistence) {
     EXPECT_EQ(t2->count(), t2Size);
 
     EXPECT_EQ(c1->count(), c1Size);
-    EXPECT_EQ(c1->checkRecord(-116), true);
-    EXPECT_EQ(c1->getRecord(-116), "whatever");
+    EXPECT_EQ(c1->checkRecord(40), true);
+    EXPECT_EQ(c1->getRecord(40), "whatever");
     EXPECT_EQ(c1->checkRecord(-4), true);
     EXPECT_EQ(c1->getRecord(-4), "testing goes brrr");
     EXPECT_EQ(c1->getRecord(-4), "testing goes brrr");
@@ -213,7 +215,7 @@ TEST_F(BaseTest, Persistence) {
 }
 
 TEST_F(BaseTest, CountAndDrop) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
     EXPECT_EQ(t1->count(), 3);
     EXPECT_EQ(t2->count(), 4);
     EXPECT_EQ(c1->count(), 4);
@@ -238,7 +240,7 @@ TEST_F(BaseTest, CountAndDrop) {
 }
 
 TEST_F(BaseTest, Change) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
     EXPECT_EQ(t1->count(), 1);
     EXPECT_EQ(t2->count(), 1);
     EXPECT_EQ(c1->count(), 2);
@@ -284,7 +286,7 @@ TEST_F(BaseTest, Change) {
 }
 
 TEST_F(BaseTest, Force) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
 
     EXPECT_EQ(t1->forceRecord(58, 35), false);                      //changing
     EXPECT_EQ(t1->forceRecord(68, 36), true);                       //adding
@@ -319,7 +321,7 @@ TEST_F(BaseTest, Force) {
 }
 
 TEST_F(BaseTest, ReadAll) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
 
     std::map<uint32_t, uint32_t> m1 = t1->readAll();
     std::map<QString, QString> m2 = t2->readAll();
@@ -350,7 +352,7 @@ TEST_F(BaseTest, ReadAll) {
 }
 
 TEST_F(BaseTest, ReplaceAll) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
 
     t1->replaceAll({
         {7, 48},
@@ -418,7 +420,7 @@ TEST_F(BaseTest, ReplaceAll) {
 }
 
 TEST_F(BaseTest, AddRecords) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
 
     LMDBAL::SizeType s1 = t1->addRecords({
         {5, 3},

test/cachecursor.cpp

@@ -4,6 +4,7 @@
 #include "storage.h"
 #include "cache.h"
 #include "cursor.h"
+#include "session.h"
 
 class CacheCursorTest : public ::testing::Test {
 protected:
@@ -19,7 +20,7 @@ protected:
             db = new LMDBAL::Base("testBase");
             db->addCache<uint64_t, std::string>("table1");
             db->addCache<uint64_t, std::string>("empty");
-            db->open();
+            session = db->open();
         }
     }
 
@@ -30,7 +31,7 @@ protected:
     static void TearDownTestSuite() {
         cursor.drop();
         transaction.terminate();
-        db->close();
+        session.close();
         db->removeDirectory();
         delete db;
         db = nullptr;
@@ -39,6 +40,7 @@ protected:
     static LMDBAL::Base* db;
     static LMDBAL::Cursor<uint64_t, std::string> cursor;
     static LMDBAL::Transaction transaction;
+    static LMDBAL::Session session;
 
     LMDBAL::Cache<uint64_t, std::string>* cache;
     LMDBAL::Cache<uint64_t, std::string>* emptyCache;
@@ -47,6 +49,7 @@ protected:
 LMDBAL::Base* CacheCursorTest::db = nullptr;
 LMDBAL::Cursor<uint64_t, std::string> CacheCursorTest::cursor;
 LMDBAL::Transaction CacheCursorTest::transaction;
+LMDBAL::Session CacheCursorTest::session;
 
 static const std::map<uint64_t, std::string> data({
     {245665783, "bothering nerds"},
@@ -402,7 +405,7 @@ TEST_F(CacheCursorTest, CursorRAIIBehaviour) {
 
 TEST_F(CacheCursorTest, CornerCases) {
     transaction.terminate();
-    EXPECT_THROW(cursor.current(), LMDBAL::Unknown);
+    EXPECT_THROW(cursor.current(), LMDBAL::CursorNotReady);
     cursor.close();
 
     LMDBAL::Cursor<uint64_t, std::string> emptyCursor = emptyCache->createCursor();
@@ -436,5 +439,40 @@ TEST_F(CacheCursorTest, CornerCases) {
     EXPECT_EQ(element.first, reference->first);
     EXPECT_EQ(element.second, reference->second);
     EXPECT_THROW(cursor.prev(), LMDBAL::NotFound);
+
+    cursor.close();
 }
 
+TEST_F(CacheCursorTest, TerminatedTransaction) {
+    LMDBAL::Cursor<uint64_t, std::string> cr = cache->createCursor();
+
+    {
+        LMDBAL::Transaction txn = db->beginReadOnlyTransaction();
+        cr.open(txn);
+        EXPECT_NO_THROW(cr.first());
+    }
+
+    EXPECT_FALSE(cr.opened());
+
+    LMDBAL::Transaction txn2;
+    {
+        LMDBAL::Transaction txn = db->beginReadOnlyTransaction();
+        EXPECT_TRUE(txn.isActive());
+        EXPECT_FALSE(txn2.isActive());
+
+        cr.open(txn);
+        EXPECT_TRUE(cr.opened());
+
+        txn2 = std::move(txn);
+        EXPECT_FALSE(txn.isActive());
+        EXPECT_TRUE(txn2.isActive());
+        EXPECT_TRUE(cr.opened());
+    }
+
+    EXPECT_TRUE(txn2.isActive());
+    EXPECT_TRUE(cr.opened());
+
+    txn2.terminate();
+    EXPECT_FALSE(txn2.isActive());
+    EXPECT_FALSE(cr.opened());
+}

test/cachetransaction.cpp

@@ -4,6 +4,7 @@
 
 #include "base.h"
 #include "cache.h"
+#include "session.h"
 
 class CacheTransactionsTest : public testing::Test {
 protected:
@@ -39,18 +40,19 @@ protected:
             db->addStorage<std::string, float>("cache2");
         }
 
-        db->open();
+        session = db->open();
         db->drop();
     }
 
     static void TearDownTestSuite() {
-        db->close();
+        session.close();
         db->removeDirectory();
         delete db;
         db = nullptr;
     }
 
     static LMDBAL::Base* db;
+    static LMDBAL::Session session;
 
     LMDBAL::Cache<int16_t, int64_t>* c1;
     LMDBAL::Cache<std::string, float>* c2;
@@ -58,9 +60,10 @@ protected:
 
 
 LMDBAL::Base* CacheTransactionsTest::db = nullptr;
+LMDBAL::Session CacheTransactionsTest::session;
 
 TEST_F(CacheTransactionsTest, Adding) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
     EXPECT_EQ(c1->count(), 0);
     EXPECT_EQ(c2->count(), 0);
 
@@ -90,7 +93,7 @@ TEST_F(CacheTransactionsTest, Adding) {
 }
 
 TEST_F(CacheTransactionsTest, Aborting) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
 
     LMDBAL::SizeType s1 = c1->count();
     LMDBAL::SizeType s2 = c2->count();
@@ -114,7 +117,7 @@ TEST_F(CacheTransactionsTest, Aborting) {
 }
 
 TEST_F(CacheTransactionsTest, Reading) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
 
     LMDBAL::Transaction txn = db->beginReadOnlyTransaction();
 
@@ -132,7 +135,7 @@ TEST_F(CacheTransactionsTest, Reading) {
 }
 
 TEST_F(CacheTransactionsTest, ConcurentReading) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
 
     LMDBAL::SizeType size = c1->count();
     LMDBAL::WriteTransaction txn = db->beginTransaction();
@@ -168,7 +171,7 @@ TEST_F(CacheTransactionsTest, ConcurentReading) {
 
 
 TEST_F(CacheTransactionsTest, ConcurentModification) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
 
     //if you start one writable transaction after another
     //in a single thread like so:
@@ -182,7 +185,7 @@ TEST_F(CacheTransactionsTest, ConcurentModification) {
 
     int pid = fork();
     if (pid == 0) {  // I am the child
-        usleep(1);
+        usleep(5);
         std::cout << "beggining second transaction" << std::endl;
         LMDBAL::WriteTransaction txn2 = db->beginTransaction();      //<--- this is where the execution should pause
                                                                     //and wait for the first transaction to get finished
@@ -208,7 +211,7 @@ TEST_F(CacheTransactionsTest, ConcurentModification) {
         LMDBAL::WriteTransaction txn1 = db->beginTransaction();
 
         std::cout << "putting parent thread to sleep for 5 ms" << std::endl;
-        usleep(5);
+        usleep(10);
 
         std::cout << "adding first transaction value" << std::endl;
         c1->addRecord(5, 812, txn1);
@@ -231,11 +234,11 @@ TEST_F(CacheTransactionsTest, ConcurentModification) {
 }
 
 TEST_F(CacheTransactionsTest, RAIIResourceFree) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
 
     int pid = fork();
     if (pid == 0) {  // I am the child
-        usleep(1);
+        usleep(5);
         std::cout << "beggining child transaction" << std::endl;
         LMDBAL::WriteTransaction txn2 = db->beginTransaction();     //<--- this is where the execution should pause
                                                                     //and wait for the first transaction to get finished
@@ -256,7 +259,7 @@ TEST_F(CacheTransactionsTest, RAIIResourceFree) {
             LMDBAL::WriteTransaction txn1 = db->beginTransaction();
 
             std::cout << "putting parent thread to sleep for 5 ms" << std::endl;
-            usleep(5);
+            usleep(10);
             std::cout << "parent thread woke up" << std::endl;
 
             std::cout << "adding value from parent thread" << std::endl;
@@ -279,3 +282,26 @@ TEST_F(CacheTransactionsTest, RAIIResourceFree) {
     EXPECT_EQ(c1->getRecord(221), 14);
 }
 
+TEST_F(CacheTransactionsTest, TransactionTerminationOnClose) {
+    LMDBAL::WriteTransaction txn = db->beginTransaction();
+
+    c1->addRecord(578, 4552, txn);
+
+    EXPECT_EQ(c1->getRecord(578, txn), 4552);
+    EXPECT_EQ(c1->checkRecord(578), false);
+
+    session.close();
+    session = db->open();
+
+    EXPECT_EQ(txn.isActive(), false);
+    EXPECT_THROW(c1->getRecord(578, txn), LMDBAL::TransactionTerminated);
+    EXPECT_NO_THROW(txn.commit());
+
+    EXPECT_EQ(c1->checkRecord(578), false);
+
+    txn = db->beginTransaction();
+    c1->addRecord(578, 4552, txn);
+    txn.commit();
+
+    EXPECT_EQ(c1->getRecord(578), 4552);
+}

test/duplicates.cpp

@@ -7,6 +7,7 @@
 #include "base.h"
 #include "storage.h"
 #include "cursor.h"
+#include "session.h"
 
 class DuplicatesTest : public ::testing::Test {
 protected:
@@ -35,18 +36,19 @@ protected:
             db->addStorage<uint16_t, double>("intDouble", true);
             db->addStorage<float, int64_t>("floatLong", true);
 
-            db->open();
+            session = db->open();
         }
     }
 
     static void TearDownTestSuite() {
-        db->close();
+        session.close();
         db->removeDirectory();
         delete db;
         db = nullptr;
     }
 
     static LMDBAL::Base* db;
+    static LMDBAL::Session session;
 
     LMDBAL::Storage<int16_t, uint16_t>* tu1;
     LMDBAL::Storage<std::string, int8_t>* tu2;
@@ -56,6 +58,7 @@ protected:
 };
 
 LMDBAL::Base* DuplicatesTest::db = nullptr;
+LMDBAL::Session DuplicatesTest::session;
 
 TEST_F(DuplicatesTest, Flags) {
     uint32_t tu1Flags = getTU1Flags();
@@ -130,7 +133,10 @@ TEST_F(DuplicatesTest, Adding) {
     tu3->addRecord(7.20001, 4.00000001);        //not sure how exactly, but it works
 
     EXPECT_EQ(tu3->count(), 7);
-    EXPECT_EQ(tu3->getRecord(7.2), -113);
+
+    std::set<float> res72({-113, -53.5478, 697, 4, 4.00000001});
+    EXPECT_EQ(res72.count(tu3->getRecord(7.2)), 1);
+
     float tu3dd = tu3->getRecord(5119);
     EXPECT_TRUE(tu3ds == tu3dd);
     EXPECT_EQ(tu3ds, tu3dd);
@@ -144,8 +150,11 @@ TEST_F(DuplicatesTest, Adding) {
     EXPECT_THROW(tu4->addRecord(327, 79.624923), LMDBAL::Exist);
 
     EXPECT_EQ(tu4->count(), 4);
-    EXPECT_EQ(tu4->getRecord(172), 0.00000001);
-    EXPECT_EQ(tu4->getRecord(327), 463.28348);          //since they are not int's they are compared sort of lexicographically
+
+    std::set<double> res327({463.28348, 79.624923});
+    std::set<double> res172({0.00001, 0.00000001});
+    EXPECT_EQ(res172.count(tu4->getRecord(172)), 1);
+    EXPECT_EQ(res327.count(tu4->getRecord(327)), 1);
 
     tu5->addRecord(-84.7, 45656753);
     EXPECT_THROW(tu5->addRecord(-84.7, 45656753), LMDBAL::Exist);
@@ -174,13 +183,19 @@ TEST_F(DuplicatesTest, Forcing) {
     tu1->addRecord(-56, 71);
     tu1->addRecord(-56, 274);
     tu1->addRecord(-56, 732);
+
+    std::set<uint16_t> res56({71, 274, 732});
     EXPECT_EQ(tu1->count(), tu1Size += 3);
     EXPECT_TRUE(tu1->forceRecord(-56, 322));
+    res56.insert(322);
     EXPECT_EQ(tu1->count(), tu1Size += 1);
-    EXPECT_EQ(tu1->getRecord(-56), 274);        //like yeah, it's really counterintuitive, since it's compared byte by byte
+    EXPECT_EQ(res56.count(tu1->getRecord(-56)), 1);
+
+    res56.insert(14);
     EXPECT_TRUE(tu1->forceRecord(-56, 14));
     EXPECT_EQ(tu1->count(), tu1Size += 1);
-    EXPECT_EQ(tu1->getRecord(-56), 14);
+    EXPECT_EQ(res56.count(tu1->getRecord(-56)), 1);
+
     EXPECT_FALSE(tu1->forceRecord(-56, 274));
     EXPECT_EQ(tu1->count(), tu1Size);
 
@@ -201,26 +216,38 @@ TEST_F(DuplicatesTest, Forcing) {
     tu3->addRecord(17.3, 93.21);
     tu3->addRecord(17.3, 6.6);
     tu3->addRecord(17.3, 105.1);
+    std::set<float> res17({93.21, 6.6, 105.1});
+
     EXPECT_EQ(tu3->count(), tu3Size += 3);
     EXPECT_TRUE(tu3->forceRecord(17.3, 74.9));
+    res17.insert(74.9);
     EXPECT_EQ(tu3->count(), tu3Size += 1);
-    EXPECT_EQ(tu3->getRecord(17.3), 105.1f);        //here too, really one should not use this function with duplicates,
-    EXPECT_TRUE(tu3->forceRecord(17.3, 5.1));       //unless he wishes for kinda randomish result
+    EXPECT_EQ(res17.count(tu3->getRecord(17.3)), 1);
+
+    EXPECT_TRUE(tu3->forceRecord(17.3, 5.1));
+    res17.insert(5.1);
     EXPECT_EQ(tu3->count(), tu3Size += 1);
-    EXPECT_EQ(tu3->getRecord(17.3), 5.1f);
+    EXPECT_EQ(res17.count(tu3->getRecord(17.3)), 1);
+
     EXPECT_FALSE(tu3->forceRecord(17.3, 93.21));
     EXPECT_EQ(tu3->count(), tu3Size);
 
     LMDBAL::SizeType tu4Size = tu4->count();
     tu4->addRecord(84, -359.109);
     tu4->addRecord(84, 2879.654);
+    std::set<double> res84({-359.109, 2879.654});
+
     EXPECT_EQ(tu4->count(), tu4Size += 2);
     EXPECT_TRUE(tu4->forceRecord(84, 72.9));
+    res84.insert(72.9);
     EXPECT_EQ(tu4->count(), tu4Size += 1);
-    EXPECT_EQ(tu4->getRecord(84), 2879.654);
+    EXPECT_EQ(res84.count(tu4->getRecord(84)), 1);
+
     EXPECT_TRUE(tu4->forceRecord(84, 2679.5));
+    res84.insert(2679.5);
     EXPECT_EQ(tu4->count(), tu4Size += 1);
-    EXPECT_EQ(tu4->getRecord(84), 2679.5);
+    EXPECT_EQ(res84.count(tu4->getRecord(84)), 1);
+
     EXPECT_FALSE(tu4->forceRecord(84, -359.109));
     EXPECT_EQ(tu4->count(), tu4Size);
 
@@ -286,6 +313,7 @@ TEST_F(DuplicatesTest, Changing) {
     EXPECT_THROW(tu2->changeRecord("jeremy spins", -7), LMDBAL::Exist);
 
     LMDBAL::SizeType tu3Size = tu3->count();
+    std::set<float> res26;
     EXPECT_THROW(tu3->changeRecord(26.7, 68.22), LMDBAL::NotFound);
     EXPECT_EQ(tu3->count(), tu3Size);
     tu3->addRecord(26.7, 68.22);
@@ -294,11 +322,13 @@ TEST_F(DuplicatesTest, Changing) {
     tu3->changeRecord(26.7, 68.22);         //should just do nothing usefull, but work normally
     EXPECT_EQ(tu3->getRecord(26.7), 68.22f);
     tu3->changeRecord(26.7, 23.18);
+    res26.insert(23.18);
     EXPECT_EQ(tu3->count(), tu3Size);
     EXPECT_EQ(tu3->getRecord(26.7), 23.18f);
     tu3->addRecord(26.7, 22.16);
+    res26.insert(22.16);
     EXPECT_EQ(tu3->count(), tu3Size += 1);
-    EXPECT_EQ(tu3->getRecord(26.7), 23.18f);
+    EXPECT_EQ(res26.count(tu3->getRecord(26.7)), 1);
     tu3->changeRecord(26.7, 21.7);
     EXPECT_EQ(tu3->count(), tu3Size);
     EXPECT_EQ(tu3->getRecord(26.7), 21.7f);
@@ -316,17 +346,21 @@ TEST_F(DuplicatesTest, Changing) {
     tu4->changeRecord(852, 6795.349);         //should just do nothing usefull, but work normally
     EXPECT_EQ(tu4->getRecord(852), 6795.349);
     tu4->changeRecord(852, 13.54);
+    std::set<double> res852({13.54});
     EXPECT_EQ(tu4->count(), tu4Size);
     EXPECT_EQ(tu4->getRecord(852), 13.54);
     tu4->addRecord(852, 213.85);
+    res852.insert(213.85);
     EXPECT_EQ(tu4->count(), tu4Size += 1);
-    EXPECT_EQ(tu4->getRecord(852), 13.54);
+    EXPECT_EQ(res852.count(tu4->getRecord(852)), 1);
     tu4->changeRecord(852, 236.21);
+    res852.insert(236.21);
     EXPECT_EQ(tu4->count(), tu4Size);
     EXPECT_EQ(tu4->getRecord(852), 236.21);
     tu4->changeRecord(852, 46324.1135);
+    res852.insert(46324.1135);
     EXPECT_EQ(tu4->count(), tu4Size);
-    EXPECT_EQ(tu4->getRecord(852), 213.85);
+    EXPECT_EQ(res852.count(tu4->getRecord(852)), 1);
     EXPECT_THROW(tu4->changeRecord(852, 46324.1135), LMDBAL::Exist);
 }
 

test/storagecursor.cpp

@@ -3,6 +3,7 @@
 #include "base.h"
 #include "storage.h"
 #include "cursor.h"
+#include "session.h"
 
 class StorageCursorTest : public ::testing::Test {
 protected:
@@ -18,7 +19,7 @@ protected:
             db = new LMDBAL::Base("testBase");
             db->addStorage<uint64_t, std::string>("table1");
             db->addStorage<uint64_t, std::string>("empty");
-            db->open();
+            session = db->open();
         }
     }
 
@@ -29,7 +30,7 @@ protected:
     static void TearDownTestSuite() {
         cursor.drop();
         transaction.terminate();
-        db->close();
+        session.close();
         db->removeDirectory();
         delete db;
         db = nullptr;
@@ -38,6 +39,7 @@ protected:
     static LMDBAL::Base* db;
     static LMDBAL::Cursor<uint64_t, std::string> cursor;
     static LMDBAL::Transaction transaction;
+    static LMDBAL::Session session;
 
     LMDBAL::Storage<uint64_t, std::string>* table;
     LMDBAL::Storage<uint64_t, std::string>* emptyTable;
@@ -46,6 +48,7 @@ protected:
 LMDBAL::Base* StorageCursorTest::db = nullptr;
 LMDBAL::Cursor<uint64_t, std::string> StorageCursorTest::cursor;
 LMDBAL::Transaction StorageCursorTest::transaction = LMDBAL::Transaction();
+LMDBAL::Session StorageCursorTest::session = LMDBAL::Session();
 
 static const std::map<uint64_t, std::string> data({
     {245665783, "bothering nerds"},
@@ -380,7 +383,7 @@ TEST_F(StorageCursorTest, CursorRAIIBehaviour) {
 TEST_F(StorageCursorTest, CornerCases) {
     EXPECT_EQ(getTableCursorsSize(), 1);
     transaction.terminate();
-    EXPECT_THROW(cursor.current(), LMDBAL::Unknown);
+    EXPECT_THROW(cursor.current(), LMDBAL::CursorNotReady);
     cursor.close();
 
     LMDBAL::Cursor<uint64_t, std::string> emptyCursor = emptyTable->createCursor();
@@ -414,4 +417,40 @@ TEST_F(StorageCursorTest, CornerCases) {
     EXPECT_EQ(element.first, reference->first);
     EXPECT_EQ(element.second, reference->second);
     EXPECT_THROW(cursor.prev(), LMDBAL::NotFound);
+
+    cursor.close();
+}
+
+TEST_F(StorageCursorTest, TerminatedTransaction) {
+    LMDBAL::Cursor<uint64_t, std::string> cr = table->createCursor();
+
+    {
+        LMDBAL::Transaction txn = db->beginReadOnlyTransaction();
+        cr.open(txn);
+        EXPECT_NO_THROW(cr.first());
+    }
+
+    EXPECT_FALSE(cr.opened());
+
+    LMDBAL::Transaction txn2;
+    {
+        LMDBAL::Transaction txn = db->beginReadOnlyTransaction();
+        EXPECT_TRUE(txn.isActive());
+        EXPECT_FALSE(txn2.isActive());
+
+        cr.open(txn);
+        EXPECT_TRUE(cr.opened());
+
+        txn2 = std::move(txn);
+        EXPECT_FALSE(txn.isActive());
+        EXPECT_TRUE(txn2.isActive());
+        EXPECT_TRUE(cr.opened());
+    }
+
+    EXPECT_TRUE(txn2.isActive());
+    EXPECT_TRUE(cr.opened());
+
+    txn2.terminate();
+    EXPECT_FALSE(txn2.isActive());
+    EXPECT_FALSE(cr.opened());
 }

test/storagetransaction.cpp

@@ -4,6 +4,7 @@
 
 #include "base.h"
 #include "storage.h"
+#include "session.h"
 
 class StorageTransactionsTest : public testing::Test {
 protected:
@@ -39,18 +40,19 @@ protected:
             db->addStorage<std::string, float>("table2");
         }
 
-        db->open();
+        session = db->open();
         db->drop();
     }
 
     static void TearDownTestSuite() {
-        db->close();
+        session.close();
         db->removeDirectory();
         delete db;
         db = nullptr;
     }
 
     static LMDBAL::Base* db;
+    static LMDBAL::Session session;
 
     LMDBAL::Storage<int16_t, int64_t>* t1;
     LMDBAL::Storage<std::string, float>* t2;
@@ -58,9 +60,10 @@ protected:
 
 
 LMDBAL::Base* StorageTransactionsTest::db = nullptr;
+LMDBAL::Session StorageTransactionsTest::session;
 
 TEST_F(StorageTransactionsTest, Adding) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
     EXPECT_EQ(t1->count(), 0);
     EXPECT_EQ(t2->count(), 0);
 
@@ -90,7 +93,7 @@ TEST_F(StorageTransactionsTest, Adding) {
 }
 
 TEST_F(StorageTransactionsTest, Aborting) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
 
     LMDBAL::SizeType s1 = t1->count();
     LMDBAL::SizeType s2 = t2->count();
@@ -114,7 +117,7 @@ TEST_F(StorageTransactionsTest, Aborting) {
 }
 
 TEST_F(StorageTransactionsTest, Reading) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
 
     LMDBAL::Transaction txn = db->beginReadOnlyTransaction();
 
@@ -132,7 +135,7 @@ TEST_F(StorageTransactionsTest, Reading) {
 }
 
 TEST_F(StorageTransactionsTest, ConcurentReading) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
 
     LMDBAL::SizeType size = t1->count();
     LMDBAL::WriteTransaction txn = db->beginTransaction();
@@ -167,7 +170,7 @@ TEST_F(StorageTransactionsTest, ConcurentReading) {
 }
 
 TEST_F(StorageTransactionsTest, ConcurentModification) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
 
     //if you start one writable transaction after another
     //in a single thread like so:
@@ -181,7 +184,7 @@ TEST_F(StorageTransactionsTest, ConcurentModification) {
 
     int pid = fork();
     if (pid == 0) {  // I am the child
-        usleep(1);
+        usleep(5);
         std::cout << "beggining second transaction" << std::endl;
         LMDBAL::WriteTransaction txn2 = db->beginTransaction();     //<--- this is where the execution should pause
                                                                     //and wait for the first transaction to get finished
@@ -207,7 +210,7 @@ TEST_F(StorageTransactionsTest, ConcurentModification) {
         LMDBAL::WriteTransaction txn1 = db->beginTransaction();
 
         std::cout << "putting parent thread to sleep for 5 ms" << std::endl;
-        usleep(5);
+        usleep(10);
 
         std::cout << "adding first transaction value" << std::endl;
         t1->addRecord(5, 812, txn1);
@@ -230,11 +233,11 @@ TEST_F(StorageTransactionsTest, ConcurentModification) {
 }
 
 TEST_F(StorageTransactionsTest, RAIIResourceFree) {
-    EXPECT_EQ(db->ready(), true);
+    EXPECT_EQ(db->opened(), true);
 
     int pid = fork();
     if (pid == 0) {  // I am the child
-        usleep(1);
+        usleep(5);
         std::cout << "beggining child transaction" << std::endl;
         LMDBAL::WriteTransaction txn2 = db->beginTransaction();     //<--- this is where the execution should pause
                                                                     //and wait for the first transaction to get finished
@@ -255,7 +258,7 @@ TEST_F(StorageTransactionsTest, RAIIResourceFree) {
             LMDBAL::WriteTransaction txn1 = db->beginTransaction();
 
             std::cout << "putting parent thread to sleep for 5 ms" << std::endl;
-            usleep(5);
+            usleep(10);
             std::cout << "parent thread woke up" << std::endl;
 
             std::cout << "adding value from parent thread" << std::endl;
@@ -277,3 +280,27 @@ TEST_F(StorageTransactionsTest, RAIIResourceFree) {
     std::cout << "checking the final result" << std::endl;
     EXPECT_EQ(t1->getRecord(221), 14);
 }
+
+TEST_F(StorageTransactionsTest, TransactionTerminationOnClose) {
+    LMDBAL::WriteTransaction txn = db->beginTransaction();
+
+    t1->addRecord(543, 229, txn);
+
+    EXPECT_EQ(t1->getRecord(543, txn), 229);
+    EXPECT_EQ(t1->checkRecord(543), false);
+
+    session.close();
+    session = db->open();
+
+    EXPECT_EQ(txn.isActive(), false);
+    EXPECT_THROW(t1->getRecord(543, txn), LMDBAL::TransactionTerminated);
+    EXPECT_NO_THROW(txn.commit());
+
+    EXPECT_EQ(t1->checkRecord(543), false);
+
+    txn = db->beginTransaction();
+    t1->addRecord(543, 229, txn);
+    txn.commit();
+
+    EXPECT_EQ(t1->getRecord(543), 229);
+}