69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
// Squawk messenger.
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// Copyright (C) 2019 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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#ifndef LMDBAL_CACHE_H
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#define LMDBAL_CACHE_H
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#include <map>
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#include <set>
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#include "storage.h"
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namespace LMDBAL {
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template <class K, class V>
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class Cache : public Storage<K, V> {
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friend class Base;
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enum class Mode { //it's a cache state when we:
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nothing, // - know nothing about records in database on disk
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size, // - know just an amount of records
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full // - shure that our cache is equal to the database on disk
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};
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protected:
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Cache(const std::string& name, Base* parent);
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~Cache() override;
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private:
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void handleMode() const;
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public:
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virtual void addRecord(const K& key, const V& value) override;
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virtual bool forceRecord(const K& key, const V& value) override;
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virtual void changeRecord(const K& key, const V& value) override;
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virtual void removeRecord(const K& key) override;
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virtual bool checkRecord(const K& key) const override;
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virtual V getRecord(const K& key) const override;
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virtual uint32_t count() const override;
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using Storage<K, V>::drop;
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virtual int drop(MDB_txn * transaction) override;
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virtual std::map<K, V> readAll() const override;
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virtual void replaceAll(const std::map<K, V>& data) override;
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virtual uint32_t addRecords(const std::map<K, V>& data, bool overwrite = false) override;
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protected:
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Mode* mode;
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std::map<K, V>* cache;
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std::set<K>* abscent;
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uint32_t* sizeDifference;
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};
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}
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#include "cache.hpp"
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#endif // LMDBAL_CACHE_H
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