82 lines
2.3 KiB
C++
82 lines
2.3 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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#include "ImageCache.hpp"
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#include <mutex>
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#include "core/ILogger.hpp"
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#include "core/Random.hpp"
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namespace lms::artwork
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{
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ImageCache::ImageCache(std::size_t maxCacheSize)
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: _maxCacheSize{ maxCacheSize }
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{
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}
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void ImageCache::addImage(const EntryDesc& entryDesc, std::shared_ptr<image::IEncodedImage> image)
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{
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// cache only resized files
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if (!entryDesc.size)
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return;
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const std::unique_lock lock{ _mutex };
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while (_cacheSize + image->getData().size() > _maxCacheSize && !_cache.empty())
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{
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auto itRandom{ core::random::pickRandom(_cache) };
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_cacheSize -= itRandom->second->getData().size();
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_cache.erase(itRandom);
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}
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_cacheSize += image->getData().size();
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_cache[entryDesc] = image;
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}
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std::shared_ptr<image::IEncodedImage> ImageCache::getImage(const EntryDesc& entryDesc) const
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{
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// cache only resized files
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if (!entryDesc.size)
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return {};
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const std::shared_lock lock{ _mutex };
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const auto it{ _cache.find(entryDesc) };
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if (it == std::cend(_cache))
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{
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++_cacheMisses;
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return nullptr;
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}
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++_cacheHits;
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return it->second;
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}
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void ImageCache::flush()
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{
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const std::unique_lock lock{ _mutex };
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LMS_LOG(COVER, DEBUG, "Cache stats: hits = " << _cacheHits.load() << ", misses = " << _cacheMisses.load() << ", nb entries = " << _cache.size() << ", size = " << _cacheSize);
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_cacheHits = 0;
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_cacheMisses = 0;
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_cacheSize = 0;
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_cache.clear();
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}
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} // namespace lms::artwork
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