mirror of
https://github.com/openharmony/window_window_manager.git
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cxy20001123
78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
/*
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* Copyright (c) 2024 Huawei Device Co., Ltd.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef WINDOW_WINDOW_MANAGER_SCREEN_CACHE_H
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#define WINDOW_WINDOW_MANAGER_SCREEN_CACHE_H
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#include <unordered_map>
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#include <list>
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#include <mutex>
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#include <algorithm>
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namespace OHOS::Rosen {
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template <typename KeyType, typename ValueType>
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class ScreenCache {
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public:
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ScreenCache(size_t capacity, ValueType errorCode);
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void Set(const KeyType& key, const ValueType& value);
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ValueType Get(const KeyType& key);
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private:
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std::unordered_map<KeyType, ValueType> Map_;
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std::list<KeyType> accessOrder_;
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const size_t capacity_;
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const ValueType errorCode_;
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std::mutex mtx_;
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};
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template <typename KeyType, typename ValueType>
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ScreenCache<KeyType, ValueType>::ScreenCache(size_t capacity, ValueType errorCode)
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: capacity_(capacity), errorCode_(errorCode)
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{
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}
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template <typename KeyType, typename ValueType>
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void ScreenCache<KeyType, ValueType>::Set(const KeyType& key, const ValueType& value)
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{
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std::lock_guard<std::mutex> guard(mtx_);
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auto it = Map_.find(key);
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if (it != Map_.end()) {
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accessOrder_.erase(std::find(accessOrder_.begin(), accessOrder_.end(), key));
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} else {
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if (Map_.size() >= capacity_) {
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KeyType lastKey = accessOrder_.back();
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accessOrder_.pop_back();
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Map_.erase(lastKey);
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}
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}
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Map_[key] = value;
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accessOrder_.push_front(key);
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}
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template <typename KeyType, typename ValueType>
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ValueType ScreenCache<KeyType, ValueType>::Get(const KeyType& key)
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{
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std::lock_guard<std::mutex> guard(mtx_);
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auto it = Map_.find(key);
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if (it != Map_.end()) {
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accessOrder_.erase(std::find(accessOrder_.begin(), accessOrder_.end(), key));
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accessOrder_.push_front(key);
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return it->second;
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}
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return errorCode_;
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}
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} // namespace OHOS::Rosen
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#endif // WINDOW_WINDOW_MANAGER_SCREEN_CACHE_H
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