112 lines
2.9 KiB
C++
112 lines
2.9 KiB
C++
/**
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* Orthanc - A Lightweight, RESTful DICOM Store
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* Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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* Department, University Hospital of Liege, Belgium
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* Copyright (C) 2017-2023 Osimis S.A., Belgium
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* Copyright (C) 2024-2025 Orthanc Team SRL, Belgium
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* Copyright (C) 2021-2025 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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*
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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**/
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#pragma once
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#include "../OrthancFramework.h"
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#include "ICacheable.h"
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#include "LeastRecentlyUsedIndex.h"
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#if !defined(__EMSCRIPTEN__)
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// Multithreading is not supported in WebAssembly
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# include <boost/thread/mutex.hpp>
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# include <boost/thread/shared_mutex.hpp>
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#endif
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#include <boost/date_time/posix_time/posix_time.hpp>
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namespace Orthanc
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{
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/**
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* Note: this class is thread safe
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**/
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class ORTHANC_PUBLIC MemoryObjectCache : public boost::noncopyable
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{
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private:
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class Item;
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#if !defined(__EMSCRIPTEN__)
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typedef boost::unique_lock<boost::shared_mutex> WriterLock;
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typedef boost::shared_lock<boost::shared_mutex> ReaderLock;
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// This mutex protects modifications to the structure of the cache (monitor)
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boost::mutex cacheMutex_;
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// This mutex protects modifications to the items that are stored in the cache
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boost::shared_mutex contentMutex_;
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#endif
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size_t currentSize_;
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size_t maxSize_;
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LeastRecentlyUsedIndex<std::string, Item*> content_;
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void Recycle(size_t targetSize);
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public:
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MemoryObjectCache();
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~MemoryObjectCache();
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size_t GetNumberOfItems(); // For unit tests only
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size_t GetCurrentSize(); // For unit tests only
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size_t GetMaximumSize();
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void SetMaximumSize(size_t size);
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void Acquire(const std::string& key,
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ICacheable* value);
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void Invalidate(const std::string& key);
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class Accessor : public boost::noncopyable
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{
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private:
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#if !defined(__EMSCRIPTEN__)
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ReaderLock readerLock_;
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WriterLock writerLock_;
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boost::mutex::scoped_lock cacheLock_;
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#endif
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Item* item_;
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public:
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Accessor(MemoryObjectCache& cache,
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const std::string& key,
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bool unique);
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bool IsValid() const
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{
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return item_ != NULL;
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}
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ICacheable& GetValue() const;
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const boost::posix_time::ptime& GetTime() const;
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};
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};
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}
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