Mercurial > hg > orthanc
annotate Core/Cache/MemoryObjectCache.h @ 3829:4fde7933e504 transcoding
integration mainline->transcoding
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Fri, 10 Apr 2020 16:36:02 +0200 |
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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 "ICacheable.h" |
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37 #include "LeastRecentlyUsedIndex.h" |
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38 |
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39 #if !defined(__EMSCRIPTEN__) |
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40 // Multithreading is not supported in WebAssembly |
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42 # include <boost/thread/shared_mutex.hpp> |
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43 #endif |
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44 |
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45 #include <boost/date_time/posix_time/posix_time.hpp> |
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46 |
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47 |
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48 namespace Orthanc |
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49 { |
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50 class MemoryObjectCache : public boost::noncopyable |
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51 { |
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52 private: |
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53 class Item; |
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54 |
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55 #if !defined(__EMSCRIPTEN__) |
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56 typedef boost::unique_lock<boost::shared_mutex> WriterLock; |
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57 typedef boost::shared_lock<boost::shared_mutex> ReaderLock; |
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58 |
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59 // This mutex protects modifications to the structure of the cache (monitor) |
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60 boost::mutex cacheMutex_; |
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61 |
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62 // This mutex protects modifications to the items that are stored in the cache |
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63 boost::shared_mutex contentMutex_; |
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64 #endif |
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65 |
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66 size_t currentSize_; |
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67 size_t maxSize_; |
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68 LeastRecentlyUsedIndex<std::string, Item*> content_; |
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69 |
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70 void Recycle(size_t targetSize); |
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71 |
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72 public: |
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73 MemoryObjectCache(); |
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74 |
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75 ~MemoryObjectCache(); |
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76 |
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77 size_t GetMaximumSize(); |
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78 |
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79 void SetMaximumSize(size_t size); |
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80 |
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81 void Acquire(const std::string& key, |
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82 ICacheable* value); |
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83 |
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84 void Invalidate(const std::string& key); |
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85 |
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86 class Accessor : public boost::noncopyable |
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87 { |
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88 private: |
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89 #if !defined(__EMSCRIPTEN__) |
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90 ReaderLock readerLock_; |
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91 WriterLock writerLock_; |
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92 boost::mutex::scoped_lock cacheLock_; |
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93 #endif |
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94 |
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95 Item* item_; |
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96 |
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97 public: |
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98 Accessor(MemoryObjectCache& cache, |
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99 const std::string& key, |
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100 bool unique); |
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101 |
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102 bool IsValid() const |
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103 { |
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104 return item_ != NULL; |
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105 } |
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106 |
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107 ICacheable& GetValue() const; |
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108 |
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109 const boost::posix_time::ptime& GetTime() const; |
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110 }; |
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111 }; |
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112 } |