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annotate OrthancFramework/Sources/FileStorage/StorageCache.h @ 5474:6cb91df32207 Orthanc-1.12.2

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Orthanc-1.12.2
author Alain Mazy <am@osimis.io>
date Tue, 19 Dec 2023 10:05:57 +0100
parents 1474fd6ea6c6
children 48b8dae6dc77
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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 "../Cache/MemoryStringCache.h"
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27
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28 #include "../Compatibility.h" // For ORTHANC_OVERRIDE
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29
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30 #include <boost/thread/mutex.hpp>
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31 #include <map>
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32
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33 namespace Orthanc
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34 {
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35 /**
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36 * Note: this class is thread safe
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37 **/
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38 class ORTHANC_PUBLIC StorageCache : public boost::noncopyable
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39 {
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40 public:
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41
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42 // The StorageCache is only accessible through this accessor.
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43 // It will make sure that only one user will fill load data and fill
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44 // the cache if multiple users try to access the same item at the same time.
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45 // This scenario happens a lot when multiple workers from a viewer access
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46 // the same file.
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47 class Accessor : public MemoryStringCache::Accessor
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48 {
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49 StorageCache& storageCache_;
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50 public:
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51 explicit Accessor(StorageCache& cache);
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52
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53 void Add(const std::string& uuid,
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54 FileContentType contentType,
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55 const std::string& value);
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56
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57 void AddStartRange(const std::string& uuid,
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58 FileContentType contentType,
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59 const std::string& value);
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60
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61 void Add(const std::string& uuid,
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62 FileContentType contentType,
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63 const void* buffer,
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64 size_t size);
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65
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66 bool Fetch(std::string& value,
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67 const std::string& uuid,
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68 FileContentType contentType);
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69
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70 bool FetchStartRange(std::string& value,
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71 const std::string& uuid,
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72 FileContentType contentType,
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73 uint64_t end /* exclusive */);
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74
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75 bool FetchTranscodedInstance(std::string& value,
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76 const std::string& uuid,
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77 DicomTransferSyntax targetSyntax);
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78
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79 void AddTranscodedInstance(const std::string& uuid,
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80 DicomTransferSyntax targetSyntax,
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81 const void* buffer,
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82 size_t size);
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83 };
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84
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85 private:
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86 MemoryStringCache cache_;
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87 std::set<DicomTransferSyntax> subKeysTransferSyntax_;
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88 boost::mutex subKeysMutex_;
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89
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90 public:
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91 void SetMaximumSize(size_t size);
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92
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93 void Invalidate(const std::string& uuid,
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94 FileContentType contentType);
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95
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96 size_t GetCurrentSize() const;
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97
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98 size_t GetNumberOfItems() const;
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99
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100 private:
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101 void Add(const std::string& uuid,
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102 FileContentType contentType,
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103 const std::string& value);
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104
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105 void AddStartRange(const std::string& uuid,
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106 FileContentType contentType,
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107 const std::string& value);
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108
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109 void Add(const std::string& uuid,
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110 FileContentType contentType,
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111 const void* buffer,
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112 size_t size);
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113
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114 bool Fetch(std::string& value,
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115 const std::string& uuid,
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116 FileContentType contentType);
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117
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118 bool FetchStartRange(std::string& value,
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119 const std::string& uuid,
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120 FileContentType contentType,
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121 uint64_t end /* exclusive */);
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122
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123 };
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124 }