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annotate OrthancFramework/Sources/Cache/MemoryObjectCache.h @ 4101:f417482f4aa6

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 06 Jul 2020 08:52:42 +0200
parents e00f3d089991
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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) 2017-2020 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 General Public License as
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9 * published by the Free Software Foundation, either version 3 of the
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10 * License, or (at your option) any later version.
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11 *
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12 * In addition, as a special exception, the copyright holders of this
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13 * program give permission to link the code of its release with the
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14 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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15 * that use the same license as the "OpenSSL" library), and distribute
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16 * the linked executables. You must obey the GNU General Public License
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17 * in all respects for all of the code used other than "OpenSSL". If you
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18 * modify file(s) with this exception, you may extend this exception to
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19 * your version of the file(s), but you are not obligated to do so. If
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20 * you do not wish to do so, delete this exception statement from your
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21 * version. If you delete this exception statement from all source files
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22 * in the program, then also delete it here.
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23 *
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24 * This program is distributed in the hope that it will be useful, but
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25 * WITHOUT ANY WARRANTY; without even the implied warranty of
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26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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27 * General Public License for more details.
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28 *
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29 * You should have received a copy of the GNU General Public License
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30 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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31 **/
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32
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33
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34 #pragma once
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35
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36 #include "../OrthancFramework.h"
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37 #include "ICacheable.h"
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38 #include "LeastRecentlyUsedIndex.h"
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39
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40 #if !defined(__EMSCRIPTEN__)
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41 // Multithreading is not supported in WebAssembly
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42 # include <boost/thread/mutex.hpp>
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43 # include <boost/thread/shared_mutex.hpp>
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44 #endif
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45
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46 #include <boost/date_time/posix_time/posix_time.hpp>
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47
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48
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49 namespace Orthanc
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50 {
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51 class ORTHANC_PUBLIC MemoryObjectCache : public boost::noncopyable
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52 {
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53 private:
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54 class Item;
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55
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56 #if !defined(__EMSCRIPTEN__)
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57 typedef boost::unique_lock<boost::shared_mutex> WriterLock;
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58 typedef boost::shared_lock<boost::shared_mutex> ReaderLock;
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59
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60 // This mutex protects modifications to the structure of the cache (monitor)
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61 boost::mutex cacheMutex_;
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62
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63 // This mutex protects modifications to the items that are stored in the cache
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64 boost::shared_mutex contentMutex_;
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65 #endif
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66
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67 size_t currentSize_;
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68 size_t maxSize_;
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69 LeastRecentlyUsedIndex<std::string, Item*> content_;
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70
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71 void Recycle(size_t targetSize);
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72
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73 public:
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74 MemoryObjectCache();
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75
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76 ~MemoryObjectCache();
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77
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78 size_t GetMaximumSize();
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79
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80 void SetMaximumSize(size_t size);
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81
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82 void Acquire(const std::string& key,
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83 ICacheable* value);
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84
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85 void Invalidate(const std::string& key);
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86
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87 class Accessor : public boost::noncopyable
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88 {
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89 private:
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90 #if !defined(__EMSCRIPTEN__)
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91 ReaderLock readerLock_;
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92 WriterLock writerLock_;
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93 boost::mutex::scoped_lock cacheLock_;
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94 #endif
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95
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96 Item* item_;
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97
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98 public:
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99 Accessor(MemoryObjectCache& cache,
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100 const std::string& key,
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101 bool unique);
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102
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103 bool IsValid() const
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104 {
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105 return item_ != NULL;
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106 }
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107
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108 ICacheable& GetValue() const;
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109
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110 const boost::posix_time::ptime& GetTime() const;
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111 };
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112 };
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113 }