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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2015 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
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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
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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 "ViewerPrefetchPolicy.h"
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22
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23 #include "ViewerToolbox.h"
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24 #include "Cache/CacheScheduler.h"
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25
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26 #include <json/value.h>
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27 #include <json/reader.h>
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28
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29
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30
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31 static const Json::Value::ArrayIndex PREFETCH_FORWARD = 10;
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32 static const Json::Value::ArrayIndex PREFETCH_BACKWARD = 3;
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33
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34
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35 namespace OrthancPlugins
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36 {
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37 void ViewerPrefetchPolicy::ApplySeries(std::list<CacheIndex>& toPrefetch,
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38 CacheScheduler& cache,
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39 const std::string& series,
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40 const std::string& content)
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41 {
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42 Json::Value json;
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43 Json::Reader reader;
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44 if (!reader.parse(content, json) ||
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45 !json.isMember("SortedInstances"))
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46 {
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47 return;
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48 }
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49
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50 const Json::Value& instances = json["SortedInstances"];
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51 if (instances.type() != Json::arrayValue)
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52 {
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53 return;
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54 }
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55
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56 for (Json::Value::ArrayIndex i = 0;
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57 i < instances.size() && i < PREFETCH_FORWARD;
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58 i++)
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59 {
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60 std::string item = "jpeg95-" + instances[i].asString();
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61 toPrefetch.push_back(CacheIndex(CacheBundle_DecodedImage, item));
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62 }
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63 }
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64
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65
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66 void ViewerPrefetchPolicy::ApplyInstance(std::list<CacheIndex>& toPrefetch,
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67 CacheScheduler& cache,
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68 const std::string& path)
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69 {
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70 size_t separator = path.find('-');
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71 if (separator == std::string::npos)
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72 {
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73 return;
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74 }
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75
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76 std::string compression = path.substr(0, separator + 1);
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77 std::string instanceId = path.substr(separator + 1);
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78
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79 Json::Value instance;
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80 if (!GetJsonFromOrthanc(instance, context_, "/instances/" + instanceId) ||
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81 !instance.isMember("ParentSeries"))
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82 {
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83 return;
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84 }
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85
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86 std::string tmp;
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87 if (!cache.Access(tmp, CacheBundle_SeriesInformation, instance["ParentSeries"].asString()))
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88 {
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89 return;
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90 }
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91
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92 Json::Value series;
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93 Json::Reader reader;
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94 if (!reader.parse(tmp, series) ||
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95 !series.isMember("SortedInstances"))
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96 {
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97 return;
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98 }
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99
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100 const Json::Value& instances = series["SortedInstances"];
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101 if (instances.type() != Json::arrayValue)
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102 {
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103 return;
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104 }
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105
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106 Json::Value::ArrayIndex position = 0;
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107 while (position < instances.size())
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108 {
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109 if (instances[position] == instanceId)
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110 {
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111 break;
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112 }
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113
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114 position++;
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115 }
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116
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117 if (position == instances.size())
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118 {
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119 return;
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120 }
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121
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122 for (Json::Value::ArrayIndex i = position;
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123 i < instances.size() && i < position + PREFETCH_FORWARD;
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124 i++)
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125 {
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126 std::string item = compression + instances[i].asString();
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127 toPrefetch.push_back(CacheIndex(CacheBundle_DecodedImage, item));
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128 }
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129
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130 for (Json::Value::ArrayIndex i = position;
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131 i >= 0 && i > position - PREFETCH_BACKWARD; )
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132 {
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133 i--;
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134 std::string item = compression + instances[i].asString();
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135 toPrefetch.push_back(CacheIndex(CacheBundle_DecodedImage, item));
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136 }
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137 }
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138
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139
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140 void ViewerPrefetchPolicy::Apply(std::list<CacheIndex>& toPrefetch,
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141 CacheScheduler& cache,
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142 const CacheIndex& accessed,
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143 const std::string& content)
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144 {
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145 switch (accessed.GetBundle())
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146 {
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147 case CacheBundle_SeriesInformation:
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148 ApplySeries(toPrefetch, cache, accessed.GetItem(), content);
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149 return;
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150
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151 case CacheBundle_DecodedImage:
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152 ApplyInstance(toPrefetch, cache, accessed.GetItem());
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153 return;
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154
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155 default:
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156 return;
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157 }
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158 }
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159 }
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160
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