72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
/*
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* Copyright (C) 2015 Emeric Poupon
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*
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* This file is part of LMS.
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*
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* LMS 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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* LMS 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 LMS. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <atomic>
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#include <cassert>
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#include <memory>
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#include <optional>
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#include <shared_mutex>
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#include <unordered_map>
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#include "database/ArtworkId.hpp"
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#include "image/IEncodedImage.hpp"
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namespace lms::artwork
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{
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class ImageCache
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{
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public:
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ImageCache(std::size_t maxCacheSize);
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struct EntryDesc
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{
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db::ArtworkId id;
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std::optional<std::size_t> size;
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bool operator==(const EntryDesc& other) const = default;
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};
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std::size_t getMaxCacheSize() const { return _maxCacheSize; }
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void addImage(const EntryDesc& entryDesc, std::shared_ptr<image::IEncodedImage> image);
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std::shared_ptr<image::IEncodedImage> getImage(const EntryDesc& entryDesc) const;
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void flush();
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private:
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const std::size_t _maxCacheSize;
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mutable std::shared_mutex _mutex;
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struct EntryHasher
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{
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std::size_t operator()(const EntryDesc& entry) const
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{
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assert(entry.size); // should not cache unresized images
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return std::hash<db::ArtworkId>{}(entry.id) ^ std::hash<std::size_t>{}(*entry.size);
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}
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};
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std::unordered_map<EntryDesc, std::shared_ptr<image::IEncodedImage>, EntryHasher> _cache;
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std::size_t _cacheSize{};
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mutable std::atomic<std::size_t> _cacheMisses;
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mutable std::atomic<std::size_t> _cacheHits;
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};
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} // namespace lms::artwork
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