Mercurial > hg > orthanc
view OrthancFramework/Sources/Cache/MemoryObjectCache.h @ 5420:d37dff2c0028 am-new-cache
Optimized the MemoryStringCache to prevent loading the same file multiple times if multiple users request the same file at the same time
author | Alain Mazy <am@osimis.io> |
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date | Mon, 13 Nov 2023 17:01:59 +0100 |
parents | 0ea402b4d901 |
children | 48b8dae6dc77 |
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/** * Orthanc - A Lightweight, RESTful DICOM Store * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics * Department, University Hospital of Liege, Belgium * Copyright (C) 2017-2023 Osimis S.A., Belgium * Copyright (C) 2021-2023 Sebastien Jodogne, ICTEAM UCLouvain, Belgium * * This program is free software: you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * as published by the Free Software Foundation, either version 3 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this program. If not, see * <http://www.gnu.org/licenses/>. **/ #pragma once #include "../OrthancFramework.h" #include "ICacheable.h" #include "LeastRecentlyUsedIndex.h" #if !defined(__EMSCRIPTEN__) // Multithreading is not supported in WebAssembly # include <boost/thread/mutex.hpp> # include <boost/thread/shared_mutex.hpp> #endif #include <boost/date_time/posix_time/posix_time.hpp> namespace Orthanc { /** * Note: this class is thread safe **/ class ORTHANC_PUBLIC MemoryObjectCache : public boost::noncopyable { private: class Item; #if !defined(__EMSCRIPTEN__) typedef boost::unique_lock<boost::shared_mutex> WriterLock; typedef boost::shared_lock<boost::shared_mutex> ReaderLock; // This mutex protects modifications to the structure of the cache (monitor) boost::mutex cacheMutex_; // This mutex protects modifications to the items that are stored in the cache boost::shared_mutex contentMutex_; #endif size_t currentSize_; size_t maxSize_; LeastRecentlyUsedIndex<std::string, Item*> content_; void Recycle(size_t targetSize); public: MemoryObjectCache(); ~MemoryObjectCache(); size_t GetNumberOfItems(); // For unit tests only size_t GetCurrentSize(); // For unit tests only size_t GetMaximumSize(); void SetMaximumSize(size_t size); void Acquire(const std::string& key, ICacheable* value); void Invalidate(const std::string& key); class Accessor : public boost::noncopyable { private: #if !defined(__EMSCRIPTEN__) ReaderLock readerLock_; WriterLock writerLock_; boost::mutex::scoped_lock cacheLock_; #endif Item* item_; public: Accessor(MemoryObjectCache& cache, const std::string& key, bool unique); bool IsValid() const { return item_ != NULL; } ICacheable& GetValue() const; const boost::posix_time::ptime& GetTime() const; }; }; }