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100 lines
2.9 KiB
100 lines
2.9 KiB
/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2022 Jon Evans <jon@craftyjon.com>
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* Copyright (C) 2022 KiCad Developers, see AUTHORS.txt for contributors.
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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 along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef KICAD_DATABASE_CACHE_H
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#define KICAD_DATABASE_CACHE_H
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#include <chrono>
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#include <list>
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#include <string>
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#include <unordered_map>
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#include <database/database_connection.h>
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class DATABASE_CACHE
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{
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public:
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typedef std::pair<std::string, std::pair<time_t, DATABASE_CONNECTION::ROW>> CACHE_ENTRY;
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DATABASE_CACHE( size_t aMaxSize, time_t aMaxAge ) :
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m_maxSize( aMaxSize ),
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m_maxAge( aMaxAge )
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{}
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void Put( const std::string& aQuery, const DATABASE_CONNECTION::ROW& aResult )
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{
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auto it = m_cache.find( aQuery );
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time_t time = std::chrono::system_clock::to_time_t( std::chrono::system_clock::now() );
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m_cacheMru.push_front( std::make_pair( aQuery,
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std::make_pair( time, aResult ) ) );
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if( it != m_cache.end() )
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{
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m_cacheMru.erase( it->second );
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m_cache.erase( it );
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}
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m_cache[aQuery] = m_cacheMru.begin();
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if( m_cache.size() > m_maxSize )
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{
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auto last = m_cacheMru.end();
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last--;
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m_cache.erase( last->first );
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m_cacheMru.pop_back();
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}
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}
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bool Get( const std::string& aQuery, DATABASE_CONNECTION::ROW& aResult )
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{
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auto it = m_cache.find( aQuery );
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if( it == m_cache.end() )
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return false;
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time_t time = std::chrono::system_clock::to_time_t( std::chrono::system_clock::now() );
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if( time - it->second->second.first > m_maxAge )
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{
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m_cacheMru.erase( it->second );
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m_cache.erase( it );
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return false;
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}
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m_cacheMru.splice( m_cacheMru.begin(), m_cacheMru, it->second );
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aResult = it->second->second.second;
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return true;
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}
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void SetMaxSize( size_t aMaxSize ) { m_maxSize = aMaxSize; }
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void SetMaxAge( time_t aMaxAge ) { m_maxAge = aMaxAge; }
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private:
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size_t m_maxSize;
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time_t m_maxAge;
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std::list<CACHE_ENTRY> m_cacheMru;
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std::unordered_map<std::string, std::list<CACHE_ENTRY>::iterator> m_cache;
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};
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#endif //KICAD_DATABASE_CACHE_H
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