Temp ideas

database.cpp

@@ -0,0 +1,98 @@
+// Squawk messenger. 
+// Copyright (C) 2019  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 "database.h"
+#include "exceptions.h"
+#include "table.h"
+
+Core::DataBase::DataBase(const QString& p_name, uint16_t mapSize):
+    name(p_name.toStdString()),
+    opened(false),
+    size(mapSize),
+    environment(),
+    tables()
+{
+}
+
+Core::DataBase::~DataBase()
+{
+    close();
+    for (const std::pair<const std::string, _Table*>& pair : tables) {
+        delete pair.second;
+    }
+}
+
+void Core::DataBase::close()
+{
+    if (opened) {
+        for (const std::pair<const std::string, _Table*>& pair : tables) {
+            _Table* table = pair.second;
+            mdb_dbi_close(environment, table->dbi);
+        }
+        mdb_env_close(environment);
+        opened = false;
+    }
+}
+
+void Core::DataBase::open()
+{
+    if (!opened) {
+        mdb_env_create(&environment);
+        QString path(QStandardPaths::writableLocation(QStandardPaths::CacheLocation));
+        path += "/" + getName();
+        QDir cache(path);
+
+        if (!cache.exists()) {
+            bool res = cache.mkpath(path);
+            if (!res) {
+                throw Directory(path.toStdString());
+            }
+        }
+
+        mdb_env_set_maxdbs(environment, tables.size());
+        mdb_env_set_mapsize(environment, size * 1024UL * 1024UL);
+        mdb_env_open(environment, path.toStdString().c_str(), 0, 0664);
+
+        MDB_txn *txn;
+        mdb_txn_begin(environment, NULL, 0, &txn);
+
+        for (const std::pair<const std::string, _Table*>& pair : tables) {
+            _Table* table = pair.second;
+            int rc = mdb_dbi_open(txn, pair.first.c_str(), MDB_CREATE, &table->dbi);
+            if (rc) {
+                throw Unknown(name, mdb_strerror(rc));
+            }
+
+        }
+        mdb_txn_commit(txn);
+        opened = true;
+    }
+}
+
+QString Core::DataBase::getName() const
+{
+    return QString::fromStdString(name);
+}
+
+template <class K, class V>
+Core::DataBase::Table<K, V>* Core::DataBase::addTable(const QString& p_name) {
+    if (opened) {
+        throw Core::DataBase::Opened(name);
+    }
+    Core::DataBase::Table<K, V>* table = new Core::DataBase::Table<K, V>();
+    tables.insert(std::make_pair(p_name.toStdString(), table));
+    return table;
+}