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86 lines
2.4 KiB
C++
86 lines
2.4 KiB
C++
/* -------------------------------------------------------------------------- */
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/* Copyright 2002-2024, OpenNebula Project, OpenNebula Systems */
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/* */
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/* Licensed under the Apache License, Version 2.0 (the "License"); you may */
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/* not use this file except in compliance with the License. You may obtain */
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/* 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 CACHE_POOL_H_
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#define CACHE_POOL_H_
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#include <mutex>
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#include <map>
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/**
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* The Cache Pool class. This class is used to store volatile pool data.
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*/
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template<typename T> class CachePool
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{
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public:
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CachePool() = default;
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~CachePool()
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{
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std::lock_guard<std::mutex> lock(resource_lock);
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for (auto it = resources.begin(); it != resources.end() ; ++it)
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{
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delete it->second;
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}
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}
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T * get_resource(int oid)
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{
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T * res;
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std::lock_guard<std::mutex> lock(resource_lock);
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auto it = resources.find(oid);
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if ( it == resources.end() )
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{
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res = new T;
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resources.insert(std::make_pair(oid, res));
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}
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else
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{
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res = it->second;
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}
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return res;
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}
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void delete_resource(int oid)
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{
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std::lock_guard<std::mutex> lock(resource_lock);
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auto it = resources.find(oid);
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if ( it != resources.end() )
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{
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delete it->second;
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resources.erase(it);
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}
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}
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private:
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std::mutex resource_lock;
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std::map<int, T *> resources;
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};
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#endif /*CACHE_POOL_H_*/ |