84 lines
1.6 KiB
C++
84 lines
1.6 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#pragma once
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#include "base/last_used_cache.h"
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namespace Core {
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template <typename Type>
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class MediaActiveCache {
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public:
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template <typename Unload>
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MediaActiveCache(int64 limit, Unload &&unload);
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void up(Type *entry);
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void remove(Type *entry);
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void clear();
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void increment(int64 amount);
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void decrement(int64 amount);
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private:
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template <typename Unload>
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void check(Unload &&unload);
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base::last_used_cache<Type*> _cache;
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SingleQueuedInvokation _delayed;
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int64 _usage = 0;
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int64 _limit = 0;
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};
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template <typename Type>
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template <typename Unload>
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MediaActiveCache<Type>::MediaActiveCache(int64 limit, Unload &&unload)
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: _delayed([=] { check(unload); })
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, _limit(limit) {
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}
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template <typename Type>
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void MediaActiveCache<Type>::up(Type *entry) {
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_cache.up(entry);
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_delayed.call();
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}
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template <typename Type>
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void MediaActiveCache<Type>::remove(Type *entry) {
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_cache.remove(entry);
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}
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template <typename Type>
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void MediaActiveCache<Type>::clear() {
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_cache.clear();
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}
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template <typename Type>
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void MediaActiveCache<Type>::increment(int64 amount) {
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_usage += amount;
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}
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template <typename Type>
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void MediaActiveCache<Type>::decrement(int64 amount) {
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_usage -= amount;
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}
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template <typename Type>
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template <typename Unload>
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void MediaActiveCache<Type>::check(Unload &&unload) {
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while (_usage > _limit) {
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if (const auto entry = _cache.take_lowest()) {
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unload(entry);
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} else {
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break;
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}
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}
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}
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} // namespace Core
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