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annotate OrthancFramework/Sources/Cache/MemoryObjectCache.h @ 5342:65d55cc86a41

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author Alain Mazy <am@osimis.io>
date Wed, 28 Jun 2023 11:54:41 +0200
parents 0ea402b4d901
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2023 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2023 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #pragma once
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25
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26 #include "../OrthancFramework.h"
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27 #include "ICacheable.h"
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28 #include "LeastRecentlyUsedIndex.h"
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29
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30 #if !defined(__EMSCRIPTEN__)
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31 // Multithreading is not supported in WebAssembly
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32 # include <boost/thread/mutex.hpp>
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33 # include <boost/thread/shared_mutex.hpp>
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34 #endif
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35
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36 #include <boost/date_time/posix_time/posix_time.hpp>
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37
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38
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39 namespace Orthanc
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40 {
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41 /**
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42 * Note: this class is thread safe
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43 **/
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44 class ORTHANC_PUBLIC MemoryObjectCache : public boost::noncopyable
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45 {
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46 private:
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47 class Item;
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48
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49 #if !defined(__EMSCRIPTEN__)
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50 typedef boost::unique_lock<boost::shared_mutex> WriterLock;
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51 typedef boost::shared_lock<boost::shared_mutex> ReaderLock;
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52
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53 // This mutex protects modifications to the structure of the cache (monitor)
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54 boost::mutex cacheMutex_;
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55
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56 // This mutex protects modifications to the items that are stored in the cache
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57 boost::shared_mutex contentMutex_;
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58 #endif
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59
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60 size_t currentSize_;
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61 size_t maxSize_;
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62 LeastRecentlyUsedIndex<std::string, Item*> content_;
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63
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64 void Recycle(size_t targetSize);
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65
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66 public:
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67 MemoryObjectCache();
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68
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69 ~MemoryObjectCache();
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70
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71 size_t GetNumberOfItems(); // For unit tests only
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72
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73 size_t GetCurrentSize(); // For unit tests only
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74
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75 size_t GetMaximumSize();
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76
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77 void SetMaximumSize(size_t size);
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78
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79 void Acquire(const std::string& key,
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80 ICacheable* value);
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81
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82 void Invalidate(const std::string& key);
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83
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84 class Accessor : public boost::noncopyable
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85 {
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86 private:
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87 #if !defined(__EMSCRIPTEN__)
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88 ReaderLock readerLock_;
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89 WriterLock writerLock_;
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90 boost::mutex::scoped_lock cacheLock_;
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91 #endif
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92
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93 Item* item_;
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94
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95 public:
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96 Accessor(MemoryObjectCache& cache,
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97 const std::string& key,
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98 bool unique);
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99
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100 bool IsValid() const
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101 {
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102 return item_ != NULL;
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103 }
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104
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105 ICacheable& GetValue() const;
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106
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107 const boost::posix_time::ptime& GetTime() const;
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108 };
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109 };
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110 }