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annotate ViewerPlugin/DicomPyramidCache.cpp @ 194:e57e6ca5303d

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 30 Jun 2020 18:03:23 +0200
parents e3cbf890b588
children b0bd22077cd8
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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
175
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5 * Copyright (C) 2017-2020 Osimis S.A., Belgium
73
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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 Affero 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 * Affero 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 Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #include "../Framework/PrecompiledHeadersWSI.h"
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23 #include "DicomPyramidCache.h"
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24
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25 #include <cassert>
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27 namespace OrthancWSI
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28 {
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29 DicomPyramid* DicomPyramidCache::GetCachedPyramid(const std::string& seriesId)
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30 {
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31 // Mutex is assumed to be locked
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32 DicomPyramid* pyramid = NULL;
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33
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34 // Is the series of interest already cached as a pyramid?
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35 if (cache_.Contains(seriesId, pyramid))
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36 {
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37 if (pyramid == NULL)
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38 {
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39 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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40 }
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41
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42 // Tag the series as the most recently used
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43 cache_.MakeMostRecent(seriesId);
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44 }
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45
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46 return pyramid;
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47 }
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48
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49
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50 DicomPyramid& DicomPyramidCache::GetPyramid(const std::string& seriesId,
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51 boost::mutex::scoped_lock& lock)
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52 {
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53 // Mutex is assumed to be locked
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54
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55 {
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56 DicomPyramid* pyramid = GetCachedPyramid(seriesId);
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57 if (pyramid != NULL)
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58 {
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59 return *pyramid;
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60 }
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61 }
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62
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63 // Unlock the mutex to construct the pyramid (this is a
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64 // time-consuming operation, we don't want it to block other clients)
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65 lock.unlock();
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66
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67 std::auto_ptr<DicomPyramid> pyramid
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68 (new DicomPyramid(orthanc_, seriesId, true /* use metadata cache */));
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69
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70 {
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71 // The pyramid is constructed: Store it into the cache
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72 lock.lock();
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74 DicomPyramid* cached = GetCachedPyramid(seriesId);
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75 if (cached != NULL)
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76 {
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77 // The pyramid was already constructed by another request in
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78 // between, reuse the cached value (the auto_ptr destroys
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79 // the just-constructed pyramid)
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80 return *cached;
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81 }
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82
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83 if (cache_.GetSize() == maxSize_)
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84 {
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85 // The cache has grown too large: First delete the least
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86 // recently used entry
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87 DicomPyramid* oldest = NULL;
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88 cache_.RemoveOldest(oldest);
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89
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90 if (oldest == NULL)
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91 {
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92 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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93 }
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94 else
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95 {
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96 delete oldest;
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97 }
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98 }
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99
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100 // Now we have at least one free entry in the cache
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101 assert(cache_.GetSize() < maxSize_);
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102
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103 // Add a new element to the cache and make it the most
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104 // recently used entry
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105 DicomPyramid* payload = pyramid.release();
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106 cache_.Add(seriesId, payload);
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107 return *payload;
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108 }
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109 }
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110
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111
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112 DicomPyramidCache::DicomPyramidCache(OrthancPlugins::IOrthancConnection& orthanc,
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113 size_t maxSize) :
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114 orthanc_(orthanc),
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115 maxSize_(maxSize)
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116 {
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117 }
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118
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119
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120 DicomPyramidCache::~DicomPyramidCache()
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121 {
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122 while (!cache_.IsEmpty())
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123 {
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124 DicomPyramid* pyramid = NULL;
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125 std::string seriesId = cache_.RemoveOldest(pyramid);
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126
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127 if (pyramid != NULL)
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128 {
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129 delete pyramid;
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130 }
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131 }
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132 }
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133
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134
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135 void DicomPyramidCache::Invalidate(const std::string& seriesId)
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136 {
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137 boost::mutex::scoped_lock lock(mutex_);
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138
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139 if (cache_.Contains(seriesId))
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140 {
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141 std::auto_ptr<DicomPyramid> pyramid(cache_.Invalidate(seriesId));
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142
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143 if (pyramid.get() == NULL)
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144 {
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145 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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146 }
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147 }
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148 }
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149
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150
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151 DicomPyramidCache::Locker::Locker(DicomPyramidCache& cache,
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152 const std::string& seriesId) :
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153 lock_(cache.mutex_),
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154 pyramid_(cache.GetPyramid(seriesId, lock_))
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155 {
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156 }
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157 }