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Blue 2023-03-21 14:05:54 +03:00
parent 19229f6c26
commit 7377f13534
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GPG key ID: 9B203B252A63EE38
29 changed files with 316 additions and 310 deletions
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cache.h
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// 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/>.
#ifndef LMDBDATABASE_CACHE_H
#define LMDBDATABASE_CACHE_H
#include <map>
#include <set>
#include "storage.h"
namespace LMDBDataBase {
template <class K, class V>
class Cache : public Storage<K, V> {
friend class DataBase;
enum class Mode { //it's a cache state when we:
nothing, // - know nothing about records in database on disk
size, // - know just an amount of records
full // - shure that our cache is equal to the database on disk
};
protected:
Cache(const std::string& name, DataBase* parent);
~Cache() override;
private:
void handleMode() const;
public:
virtual void addRecord(const K& key, const V& value) override;
virtual bool forceRecord(const K& key, const V& value) override;
virtual void changeRecord(const K& key, const V& value) override;
virtual void removeRecord(const K& key) override;
virtual bool checkRecord(const K& key) const override;
virtual V getRecord(const K& key) const override;
virtual uint32_t count() const override;
using Storage<K, V>::drop;
virtual int drop(MDB_txn * transaction) override;
virtual std::map<K, V> readAll() const override;
virtual void replaceAll(const std::map<K, V>& data) override;
virtual uint32_t addRecords(const std::map<K, V>& data, bool overwrite = false) override;
protected:
Mode* mode;
std::map<K, V>* cache;
std::set<K>* abscent;
uint32_t* sizeDifference;
};
}
#include "cache.hpp"
#endif // LMDBDATABASE_CACHE_H