149 lines
3.9 KiB
C++
149 lines
3.9 KiB
C++
/*
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* LMDB Abstraction Layer.
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* Copyright (C) 2023 Yury Gubich <blue@macaw.me>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef LMDBAL_BASE_H
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#define LMDBAL_BASE_H
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#include <map>
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#include <set>
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#include <string>
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#include <optional>
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#include <limits>
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#include <QString>
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#include <QStandardPaths>
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#include <QDir>
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#include <lmdb.h>
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#include "exceptions.h"
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namespace LMDBAL {
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class iStorage;
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template<class T>
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class Serializer;
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template <class K, class V>
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class Storage;
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template <class K, class V>
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class Cache;
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typedef MDB_txn* TransactionID;
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class Base {
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friend class iStorage;
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public:
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Base(const QString& name, uint16_t mapSize = 10);
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~Base();
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void open();
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void close();
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bool ready() const;
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bool removeDirectory();
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QString createDirectory();
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QString getName() const;
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void drop();
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TransactionID beginReadOnlyTransaction() const;
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TransactionID beginTransaction() const;
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void commitTransaction(TransactionID id) const;
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void abortTransaction(TransactionID id) const;
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template <class K, class V>
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LMDBAL::Storage<K, V>* addStorage(const std::string& name);
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template <class K, class V>
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LMDBAL::Cache<K, V>* addCache(const std::string& name);
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template <class K, class V>
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LMDBAL::Storage<K, V>* getStorage(const std::string& name);
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template <class K, class V>
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LMDBAL::Cache<K, V>* getCache(const std::string& name);
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private:
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typedef std::map<std::string, LMDBAL::iStorage*> Tables;
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typedef std::set<TransactionID> Transactions;
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TransactionID beginReadOnlyTransaction(const std::string& storageName) const;
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TransactionID beginTransaction(const std::string& storageName) const;
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void commitTransaction(TransactionID id, const std::string& storageName) const;
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void abortTransaction(TransactionID id, const std::string& storageName) const;
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private:
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std::string name;
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bool opened;
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uint16_t size;
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MDB_env* environment;
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Tables tables;
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Transactions* transactions;
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inline static const std::string emptyName = "";
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};
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}
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#include "operators.hpp"
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/**
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* Adds LMDBAL::Storage with the given name to the LMDBAL::Base, also returns it. The LMDBAL::Base must be closed
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*/
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template <class K, class V>
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LMDBAL::Storage<K, V>* LMDBAL::Base::addStorage(const std::string& p_name) {
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if (opened) {
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throw Opened(name, "add table " + p_name);
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}
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Storage<K, V>* table = new Storage<K, V>(p_name, this);
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tables.insert(std::make_pair(p_name, (iStorage*)table));
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return table;
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}
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/**
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* Adds LMDBAL::Cache with given the name to the LMDBAL::Base, also returns it. The LMDBAL::Base must be closed
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*/
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template<class K, class V>
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LMDBAL::Cache<K, V> * LMDBAL::Base::addCache(const std::string& p_name) {
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if (opened) {
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throw Opened(name, "add cache " + p_name);
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}
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Cache<K, V>* cache = new Cache<K, V>(p_name, this);
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tables.insert(std::make_pair(p_name, (iStorage*)cache));
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return cache;
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}
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/**
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* Returns LMDBAL::Storage with the given name
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*/
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template <class K, class V>
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LMDBAL::Storage<K, V>* LMDBAL::Base::getStorage(const std::string& p_name) {
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return static_cast<Storage<K, V>*>(tables.at(p_name));
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}
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/**
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* Returns LMDBAL::Cache with the given name
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*/
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template <class K, class V>
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LMDBAL::Cache<K, V>* LMDBAL::Base::getCache(const std::string& p_name) {
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return static_cast<Cache<K, V>*>(tables.at(p_name));
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}
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#endif //LMDBAL_BASE_H
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