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annotate OrthancFramework/Sources/Cache/MemoryObjectCache.h @ 4742:31793125f491

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 06 Jul 2021 09:53:25 +0200
parents 789676a8c96a
children 434843934307
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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) 2017-2021 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #pragma once
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24
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25 #include "../OrthancFramework.h"
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26 #include "ICacheable.h"
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27 #include "LeastRecentlyUsedIndex.h"
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28
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29 #if !defined(__EMSCRIPTEN__)
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30 // Multithreading is not supported in WebAssembly
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31 # include <boost/thread/mutex.hpp>
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32 # include <boost/thread/shared_mutex.hpp>
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33 #endif
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34
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35 #include <boost/date_time/posix_time/posix_time.hpp>
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36
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37
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38 namespace Orthanc
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39 {
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40 class ORTHANC_PUBLIC MemoryObjectCache : public boost::noncopyable
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41 {
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42 private:
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43 class Item;
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44
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45 #if !defined(__EMSCRIPTEN__)
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46 typedef boost::unique_lock<boost::shared_mutex> WriterLock;
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47 typedef boost::shared_lock<boost::shared_mutex> ReaderLock;
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48
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49 // This mutex protects modifications to the structure of the cache (monitor)
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50 boost::mutex cacheMutex_;
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51
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52 // This mutex protects modifications to the items that are stored in the cache
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53 boost::shared_mutex contentMutex_;
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54 #endif
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55
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56 size_t currentSize_;
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57 size_t maxSize_;
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58 LeastRecentlyUsedIndex<std::string, Item*> content_;
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59
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60 void Recycle(size_t targetSize);
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61
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62 public:
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63 MemoryObjectCache();
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64
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65 ~MemoryObjectCache();
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66
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67 size_t GetNumberOfItems(); // For unit tests only
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68
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69 size_t GetCurrentSize(); // For unit tests only
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70
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71 size_t GetMaximumSize();
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72
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73 void SetMaximumSize(size_t size);
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74
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75 void Acquire(const std::string& key,
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76 ICacheable* value);
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77
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78 void Invalidate(const std::string& key);
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79
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80 class Accessor : public boost::noncopyable
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81 {
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82 private:
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83 #if !defined(__EMSCRIPTEN__)
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84 ReaderLock readerLock_;
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85 WriterLock writerLock_;
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86 boost::mutex::scoped_lock cacheLock_;
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87 #endif
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88
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89 Item* item_;
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90
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91 public:
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92 Accessor(MemoryObjectCache& cache,
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93 const std::string& key,
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94 bool unique);
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95
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96 bool IsValid() const
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97 {
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98 return item_ != NULL;
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99 }
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100
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101 ICacheable& GetValue() const;
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102
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103 const boost::posix_time::ptime& GetTime() const;
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104 };
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105 };
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106 }