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lmdbal/src/base.h

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/*
* 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/>.
*/
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#ifndef LMDBAL_BASE_H
#define LMDBAL_BASE_H
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#include <map>
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#include <set>
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#include <string>
#include <optional>
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#include <limits>
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#include <QString>
#include <QStandardPaths>
#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>
class Serializer;
template <class K, class V>
class Storage;
template <class K, class V>
class Cache;
typedef MDB_txn* TransactionID;
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class Base {
friend class iStorage;
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public:
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Base(const QString& name, uint16_t mapSize = 10);
~Base();
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void open();
void close();
bool ready() const;
bool removeDirectory();
QString createDirectory();
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QString getName() const;
void drop();
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TransactionID beginReadOnlyTransaction() const;
TransactionID beginTransaction() const;
void commitTransaction(TransactionID id) const;
void abortTransaction(TransactionID id) const;
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template <class K, class V>
LMDBAL::Storage<K, V>* addStorage(const std::string& name);
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template <class K, class V>
LMDBAL::Cache<K, V>* addCache(const std::string& name);
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template <class K, class V>
LMDBAL::Storage<K, V>* getStorage(const std::string& name);
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template <class K, class V>
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*> Storages;
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typedef std::set<TransactionID> Transactions;
TransactionID beginReadOnlyTransaction(const std::string& storageName) const;
TransactionID beginTransaction(const std::string& storageName) const;
void commitTransaction(TransactionID id, const std::string& storageName) const;
void abortTransaction(TransactionID id, const std::string& storageName) const;
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TransactionID beginPrivateReadOnlyTransaction(const std::string& storageName) const;
TransactionID beginPrivateTransaction(const std::string& storageName) const;
void commitPrivateTransaction(TransactionID id, const std::string& storageName) const;
void abortPrivateTransaction(TransactionID id, const std::string& storageName) const;
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private:
std::string name;
bool opened;
uint16_t size;
MDB_env* environment;
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Storages storages;
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Transactions* transactions;
inline static const std::string emptyName = "";
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};
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}
#include "operators.hpp"
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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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template <class K, class V>
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 storage " + p_name);
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}
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Storage<K, V>* storage = new Storage<K, V>(p_name, this);
storages.insert(std::make_pair(p_name, (iStorage*)storage));
return storage;
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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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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) {
throw Opened(name, "add cache " + p_name);
}
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Cache<K, V>* cache = new Cache<K, V>(p_name, this);
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storages.insert(std::make_pair(p_name, (iStorage*)cache));
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return cache;
}
/**
* Returns LMDBAL::Storage with the given name
*/
template <class K, class V>
LMDBAL::Storage<K, V>* LMDBAL::Base::getStorage(const std::string& p_name) {
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return static_cast<Storage<K, V>*>(storages.at(p_name));
}
/**
* Returns LMDBAL::Cache with the given name
*/
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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>*>(storages.at(p_name));
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}
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#endif //LMDBAL_BASE_H