Mercurial > hg > orthanc
diff Core/Cache/MemoryObjectCache.h @ 3786:3801435e34a1 SylvainRouquette/fix-issue169-95b752c
integration Orthanc-1.6.0->SylvainRouquette
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Thu, 19 Mar 2020 11:48:30 +0100 |
parents | 94f4a18a79cc |
children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Core/Cache/MemoryObjectCache.h Thu Mar 19 11:48:30 2020 +0100 @@ -0,0 +1,112 @@ +/** + * Orthanc - A Lightweight, RESTful DICOM Store + * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics + * Department, University Hospital of Liege, Belgium + * Copyright (C) 2017-2020 Osimis S.A., Belgium + * + * This program is free software: you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation, either version 3 of the + * License, or (at your option) any later version. + * + * In addition, as a special exception, the copyright holders of this + * program give permission to link the code of its release with the + * OpenSSL project's "OpenSSL" library (or with modified versions of it + * that use the same license as the "OpenSSL" library), and distribute + * the linked executables. You must obey the GNU General Public License + * in all respects for all of the code used other than "OpenSSL". If you + * modify file(s) with this exception, you may extend this exception to + * your version of the file(s), but you are not obligated to do so. If + * you do not wish to do so, delete this exception statement from your + * version. If you delete this exception statement from all source files + * in the program, then also delete it here. + * + * 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 + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + **/ + + +#pragma once + +#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 +{ + class 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 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; + }; + }; +}