Mercurial > hg > orthanc
diff Core/Cache/MemoryCache.h @ 284:06aa7b7b6723
implementation of a single-threaded cache mechanism
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 12 Dec 2012 15:40:18 +0100 |
parents | |
children | 4031f73fe0e4 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Core/Cache/MemoryCache.h Wed Dec 12 15:40:18 2012 +0100 @@ -0,0 +1,96 @@ +/** + * Orthanc - A Lightweight, RESTful DICOM Store + * Copyright (C) 2012 Medical Physics Department, CHU of Liege, + * 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 <memory> +#include "CacheIndex.h" +#include "ICachePageProvider.h" + +namespace Orthanc +{ + /** + * WARNING: This class is NOT thread-safe. + **/ + class MemoryCache + { + private: + struct Page + { + std::string id_; + std::auto_ptr<IDynamicObject> content_; + }; + + ICachePageProvider& provider_; + size_t cacheSize_; + CacheIndex<std::string, Page*> index_; + + Page& Load(const std::string& id); + + public: + class Accessor + { + friend class MemoryCache; + + private: + Page& element_; + + Accessor(Page& element) : + element_(element) + { + } + + public: + const std::string GetId() const + { + return element_.id_; + } + + IDynamicObject& GetContent() + { + return *element_.content_; + } + + const IDynamicObject& GetContent() const + { + return *element_.content_; + } + }; + + MemoryCache(ICachePageProvider& provider, + size_t cacheSize); + + ~MemoryCache(); + + Accessor* Access(const std::string& id); + }; +}