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annotate ViewerPlugin/DicomPyramidCache.cpp @ 73:a8c90aa32ca6

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LRU caching of pyramids, OrthancWSIClearCache script
author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 28 Nov 2016 16:51:19 +0100
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children ff0ef01c332c
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73
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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 *
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6 * This program is free software: you can redistribute it and/or
a8c90aa32ca6 LRU caching of pyramids, OrthancWSIClearCache script
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7 * modify it under the terms of the GNU Affero General Public License
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8 * as published by the Free Software Foundation, either version 3 of
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9 * the License, or (at your option) any later version.
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10 *
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11 * This program is distributed in the hope that it will be useful, but
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12 * WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * Affero General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU Affero General Public License
a8c90aa32ca6 LRU caching of pyramids, OrthancWSIClearCache script
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17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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18 **/
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19
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20
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21 #include "../Framework/PrecompiledHeadersWSI.h"
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22 #include "DicomPyramidCache.h"
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23
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24 #include <cassert>
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25
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26 namespace OrthancWSI
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27 {
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28 DicomPyramid* DicomPyramidCache::GetCachedPyramid(const std::string& seriesId)
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29 {
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30 // Mutex is assumed to be locked
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31 DicomPyramid* pyramid = NULL;
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32
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33 // Is the series of interest already cached as a pyramid?
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34 if (cache_.Contains(seriesId, pyramid))
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35 {
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36 if (pyramid == NULL)
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37 {
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38 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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39 }
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40
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41 // Tag the series as the most recently used
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42 cache_.MakeMostRecent(seriesId);
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43 }
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44
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45 return pyramid;
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46 }
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47
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48
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49 DicomPyramid& DicomPyramidCache::GetPyramid(const std::string& seriesId,
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50 boost::mutex::scoped_lock& lock)
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51 {
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52 // Mutex is assumed to be locked
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53
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54 {
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55 DicomPyramid* pyramid = GetCachedPyramid(seriesId);
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56 if (pyramid != NULL)
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57 {
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58 return *pyramid;
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59 }
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60 }
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61
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62 // Unlock the mutex to construct the pyramid (this is a
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63 // time-consuming operation, we don't want it to block other clients)
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64 lock.unlock();
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65
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66 std::auto_ptr<DicomPyramid> pyramid
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67 (new DicomPyramid(orthanc_, seriesId, true /* use metadata cache */));
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68
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69 {
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70 // The pyramid is constructed: Store it into the cache
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71 lock.lock();
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72
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73 DicomPyramid* cached = GetCachedPyramid(seriesId);
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74 if (cached != NULL)
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75 {
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76 // The pyramid was already constructed by another request in
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77 // between, reuse the cached value (the auto_ptr destroys
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78 // the just-constructed pyramid)
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79 return *cached;
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80 }
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81
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82 if (cache_.GetSize() == maxSize_)
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83 {
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84 // The cache has grown too large: First delete the least
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85 // recently used entry
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86 DicomPyramid* oldest = NULL;
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87 cache_.RemoveOldest(oldest);
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88
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89 if (oldest == NULL)
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90 {
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91 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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92 }
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93 else
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94 {
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95 delete oldest;
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96 }
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97 }
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98
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99 // Now we have at least one free entry in the cache
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100 assert(cache_.GetSize() < maxSize_);
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101
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102 // Add a new element to the cache and make it the most
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103 // recently used entry
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104 DicomPyramid* payload = pyramid.release();
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105 cache_.Add(seriesId, payload);
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106 return *payload;
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107 }
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108 }
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109
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110
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111 DicomPyramidCache::DicomPyramidCache(OrthancPlugins::IOrthancConnection& orthanc,
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112 size_t maxSize) :
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113 orthanc_(orthanc),
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114 maxSize_(maxSize)
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115 {
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116 }
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117
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118
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119 DicomPyramidCache::~DicomPyramidCache()
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120 {
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121 while (!cache_.IsEmpty())
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122 {
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123 DicomPyramid* pyramid = NULL;
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124 std::string seriesId = cache_.RemoveOldest(pyramid);
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125
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126 if (pyramid != NULL)
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127 {
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128 delete pyramid;
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129 }
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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 void DicomPyramidCache::Invalidate(const std::string& seriesId)
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135 {
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136 boost::mutex::scoped_lock lock(mutex_);
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137
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138 if (cache_.Contains(seriesId))
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139 {
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140 std::auto_ptr<DicomPyramid> pyramid(cache_.Invalidate(seriesId));
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141
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142 if (pyramid.get() == NULL)
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143 {
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144 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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145 }
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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 DicomPyramidCache::Locker::Locker(DicomPyramidCache& cache,
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151 const std::string& seriesId) :
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152 lock_(cache.mutex_),
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153 pyramid_(cache.GetPyramid(seriesId, lock_))
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154 {
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155 }
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156 }