Mercurial > hg > orthanc-wsi

annotate ViewerPlugin/DicomPyramidCache.cpp @ 254:20a730889ae2

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upgrade to 2023
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 07 Jul 2023 17:38:07 +0200
parents 49f647ed1b4c
children c72fbdecdc38
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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 Affero 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 * Affero 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 Affero General Public License
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19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 **/
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21
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23 #include "../Framework/PrecompiledHeadersWSI.h"
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24 #include "DicomPyramidCache.h"
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26 #include <Compatibility.h> // For std::unique_ptr
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27
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28 #include <cassert>
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30 namespace OrthancWSI
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31 {
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32 DicomPyramid* DicomPyramidCache::GetCachedPyramid(const std::string& seriesId)
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33 {
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34 // Mutex is assumed to be locked
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35 DicomPyramid* pyramid = NULL;
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37 // Is the series of interest already cached as a pyramid?
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38 if (cache_.Contains(seriesId, pyramid))
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39 {
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40 if (pyramid == NULL)
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41 {
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42 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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43 }
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44
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45 // Tag the series as the most recently used
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46 cache_.MakeMostRecent(seriesId);
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47 }
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48
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49 return pyramid;
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50 }
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52
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53 DicomPyramid& DicomPyramidCache::GetPyramid(const std::string& seriesId,
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54 boost::mutex::scoped_lock& lock)
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55 {
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56 // Mutex is assumed to be locked
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57
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58 {
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59 DicomPyramid* pyramid = GetCachedPyramid(seriesId);
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60 if (pyramid != NULL)
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61 {
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62 return *pyramid;
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63 }
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64 }
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65
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66 // Unlock the mutex to construct the pyramid (this is a
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67 // time-consuming operation, we don't want it to block other clients)
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68 lock.unlock();
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69
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70 std::unique_ptr<DicomPyramid> pyramid
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71 (new DicomPyramid(orthanc_, seriesId, true /* use metadata cache */));
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73 {
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74 // The pyramid is constructed: Store it into the cache
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75 lock.lock();
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76
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77 DicomPyramid* cached = GetCachedPyramid(seriesId);
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78 if (cached != NULL)
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79 {
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80 // The pyramid was already constructed by another request in
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81 // between, reuse the cached value (the auto_ptr destroys
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82 // the just-constructed pyramid)
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83 return *cached;
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84 }
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85
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86 if (cache_.GetSize() == maxSize_)
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87 {
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88 // The cache has grown too large: First delete the least
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89 // recently used entry
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90 DicomPyramid* oldest = NULL;
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91 cache_.RemoveOldest(oldest);
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92
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93 if (oldest == NULL)
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94 {
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95 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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96 }
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97 else
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98 {
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99 delete oldest;
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100 }
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101 }
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102
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103 // Now we have at least one free entry in the cache
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104 assert(cache_.GetSize() < maxSize_);
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105
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106 // Add a new element to the cache and make it the most
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107 // recently used entry
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108 DicomPyramid* payload = pyramid.release();
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109 cache_.Add(seriesId, payload);
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110 return *payload;
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111 }
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112 }
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113
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114
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115 DicomPyramidCache::DicomPyramidCache(OrthancStone::IOrthancConnection& orthanc,
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116 size_t maxSize) :
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117 orthanc_(orthanc),
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118 maxSize_(maxSize)
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119 {
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120 }
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121
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122
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123 DicomPyramidCache::~DicomPyramidCache()
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124 {
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125 while (!cache_.IsEmpty())
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126 {
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127 DicomPyramid* pyramid = NULL;
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128 std::string seriesId = cache_.RemoveOldest(pyramid);
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129
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130 if (pyramid != NULL)
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131 {
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132 delete pyramid;
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133 }
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134 }
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135 }
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136
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137
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138 void DicomPyramidCache::Invalidate(const std::string& seriesId)
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139 {
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140 boost::mutex::scoped_lock lock(mutex_);
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141
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142 if (cache_.Contains(seriesId))
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143 {
199
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144 std::unique_ptr<DicomPyramid> pyramid(cache_.Invalidate(seriesId));
73
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145
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146 if (pyramid.get() == NULL)
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147 {
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148 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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149 }
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150 }
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151 }
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152
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153
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154 DicomPyramidCache::Locker::Locker(DicomPyramidCache& cache,
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155 const std::string& seriesId) :
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156 lock_(cache.mutex_),
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157 pyramid_(cache.GetPyramid(seriesId, lock_))
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158 {
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159 }
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160 }