mirror of
https://github.com/OpenSpace/OpenSpace.git
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88 lines
4.4 KiB
C++
88 lines
4.4 KiB
C++
/*****************************************************************************************
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* *
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* OpenSpace *
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* *
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* Copyright (c) 2014-2024 *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this *
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* software and associated documentation files (the "Software"), to deal in the Software *
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* without restriction, including without limitation the rights to use, copy, modify, *
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* merge, publish, distribute, sublicense, and/or sell copies of the Software, and to *
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* permit persons to whom the Software is furnished to do so, subject to the following *
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* conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in all copies *
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* or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, *
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A *
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* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT *
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF *
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE *
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* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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****************************************************************************************/
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namespace openspace::volume {
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template <typename KeyType, typename ValueType, template<typename...> class ContainerType>
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LruCache<KeyType, ValueType, ContainerType>::LruCache(size_t capacity) {
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_capacity = capacity;
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}
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template <typename KeyType, typename ValueType, template<typename...> class ContainerType>
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bool LruCache<KeyType, ValueType, ContainerType>::has(const KeyType& key) {
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return (_cache.find(key) != _cache.end());
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}
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template <typename KeyType, typename ValueType, template<typename...> class ContainerType>
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void LruCache<KeyType, ValueType, ContainerType>::set(const KeyType& key, ValueType value)
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{
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auto prev = _cache.find(key);
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if (prev != _cache.end()) {
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prev->second.first = value;
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std::list<KeyType>::iterator trackerIter = prev->second.second;
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_tracker.splice(_tracker.end(), _tracker, trackerIter);
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}
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else {
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insert(key, value);
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}
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}
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template <typename KeyType, typename ValueType, template<typename...> class ContainerType>
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ValueType& LruCache<KeyType, ValueType, ContainerType>::use(const KeyType& key) {
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auto iter = _cache.find(key);
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std::list<KeyType>::iterator trackerIter = iter->second.second;
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_tracker.splice(_tracker.end(), _tracker, trackerIter);
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return iter->second.first;
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}
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template <typename KeyType, typename ValueType, template<typename...> class ContainerType>
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ValueType& LruCache<KeyType, ValueType, ContainerType>::get(const KeyType& key) {
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auto iter = _cache.find(key);
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return iter->second.first;
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}
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template <typename KeyType, typename ValueType, template<typename...> class ContainerType>
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void LruCache<KeyType, ValueType, ContainerType>::evict() {
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_cache.erase(_cache.find(_tracker.front()));
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_tracker.pop_front();
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}
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template <typename KeyType, typename ValueType, template<typename...> class ContainerType>
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size_t LruCache<KeyType, ValueType, ContainerType>::capacity() const {
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return _capacity;
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}
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template <typename KeyType, typename ValueType, template<typename...> class ContainerType>
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void LruCache<KeyType, ValueType, ContainerType>::insert(const KeyType& key,
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const ValueType& value)
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{
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if (_cache.size() == _capacity) {
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evict();
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}
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auto iter = _tracker.insert(_tracker.end(), key);
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_cache[key] = std::make_pair(value, iter);
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};
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} // namespace openspace::volume
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