Mercurial > hg > orthanc-webviewer
annotate Plugin/ViewerPrefetchPolicy.cpp @ 197:0ef2d8b970ab
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Mon, 23 Apr 2018 11:42:31 +0200 |
| parents | 81f16c5667ba |
| children | 2f27287c047c |
| rev | line source |
|---|---|
| 0 | 1 /** |
| 2 * Orthanc - A Lightweight, RESTful DICOM Store | |
| 122 | 3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics |
| 0 | 4 * Department, University Hospital of Liege, Belgium |
|
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5 * Copyright (C) 2017-2018 Osimis S.A., Belgium |
| 0 | 6 * |
| 7 * This program is free software: you can redistribute it and/or | |
| 8 * modify it under the terms of the GNU Affero General Public License | |
| 9 * as published by the Free Software Foundation, either version 3 of | |
| 10 * the License, or (at your option) any later version. | |
| 11 * | |
| 12 * This program is distributed in the hope that it will be useful, but | |
| 13 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 15 * Affero General Public License for more details. | |
| 16 * | |
| 17 * You should have received a copy of the GNU Affero General Public License | |
| 18 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 **/ | |
| 20 | |
| 21 | |
| 22 #include "ViewerPrefetchPolicy.h" | |
| 23 | |
| 24 #include "ViewerToolbox.h" | |
| 25 #include "Cache/CacheScheduler.h" | |
| 26 | |
| 27 #include <json/value.h> | |
| 28 #include <json/reader.h> | |
| 29 | |
| 30 | |
| 31 | |
| 32 static const Json::Value::ArrayIndex PREFETCH_FORWARD = 10; | |
| 33 static const Json::Value::ArrayIndex PREFETCH_BACKWARD = 3; | |
| 34 | |
| 35 | |
| 36 namespace OrthancPlugins | |
| 37 { | |
| 38 void ViewerPrefetchPolicy::ApplySeries(std::list<CacheIndex>& toPrefetch, | |
| 39 CacheScheduler& cache, | |
| 40 const std::string& series, | |
| 41 const std::string& content) | |
| 42 { | |
| 43 Json::Value json; | |
| 44 Json::Reader reader; | |
| 45 if (!reader.parse(content, json) || | |
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46 !json.isMember("Slices")) |
| 0 | 47 { |
| 48 return; | |
| 49 } | |
| 50 | |
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51 const Json::Value& instances = json["Slices"]; |
| 0 | 52 if (instances.type() != Json::arrayValue) |
| 53 { | |
| 54 return; | |
| 55 } | |
| 56 | |
| 57 for (Json::Value::ArrayIndex i = 0; | |
| 58 i < instances.size() && i < PREFETCH_FORWARD; | |
| 59 i++) | |
| 60 { | |
| 61 std::string item = "jpeg95-" + instances[i].asString(); | |
| 62 toPrefetch.push_back(CacheIndex(CacheBundle_DecodedImage, item)); | |
| 63 } | |
| 64 } | |
| 65 | |
| 66 | |
| 67 void ViewerPrefetchPolicy::ApplyInstance(std::list<CacheIndex>& toPrefetch, | |
| 68 CacheScheduler& cache, | |
| 69 const std::string& path) | |
| 70 { | |
| 71 size_t separator = path.find('-'); | |
| 72 if (separator == std::string::npos) | |
| 73 { | |
| 74 return; | |
| 75 } | |
| 76 | |
| 77 std::string compression = path.substr(0, separator + 1); | |
| 101 | 78 std::string instanceAndFrame = path.substr(separator + 1); |
| 0 | 79 |
| 101 | 80 std::string instanceId = instanceAndFrame.substr(0, instanceAndFrame.find('_')); |
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81 |
| 0 | 82 Json::Value instance; |
| 83 if (!GetJsonFromOrthanc(instance, context_, "/instances/" + instanceId) || | |
| 84 !instance.isMember("ParentSeries")) | |
| 85 { | |
| 86 return; | |
| 87 } | |
| 88 | |
| 89 std::string tmp; | |
| 90 if (!cache.Access(tmp, CacheBundle_SeriesInformation, instance["ParentSeries"].asString())) | |
| 91 { | |
| 92 return; | |
| 93 } | |
| 94 | |
| 95 Json::Value series; | |
| 96 Json::Reader reader; | |
| 97 if (!reader.parse(tmp, series) || | |
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98 !series.isMember("Slices")) |
| 0 | 99 { |
| 100 return; | |
| 101 } | |
| 102 | |
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103 const Json::Value& instances = series["Slices"]; |
| 101 | 104 |
| 0 | 105 if (instances.type() != Json::arrayValue) |
| 106 { | |
| 107 return; | |
| 108 } | |
| 109 | |
| 110 Json::Value::ArrayIndex position = 0; | |
| 111 while (position < instances.size()) | |
| 112 { | |
| 101 | 113 if (instances[position] == instanceAndFrame) |
| 0 | 114 { |
| 115 break; | |
| 116 } | |
| 117 | |
| 118 position++; | |
| 119 } | |
| 120 | |
| 121 if (position == instances.size()) | |
| 122 { | |
| 123 return; | |
| 124 } | |
| 125 | |
| 126 for (Json::Value::ArrayIndex i = position; | |
| 127 i < instances.size() && i < position + PREFETCH_FORWARD; | |
| 128 i++) | |
| 129 { | |
| 130 std::string item = compression + instances[i].asString(); | |
| 131 toPrefetch.push_back(CacheIndex(CacheBundle_DecodedImage, item)); | |
| 132 } | |
| 133 | |
| 134 for (Json::Value::ArrayIndex i = position; | |
| 135 i >= 0 && i > position - PREFETCH_BACKWARD; ) | |
| 136 { | |
| 137 i--; | |
| 138 std::string item = compression + instances[i].asString(); | |
| 139 toPrefetch.push_back(CacheIndex(CacheBundle_DecodedImage, item)); | |
| 140 } | |
| 141 } | |
| 142 | |
| 143 | |
| 144 void ViewerPrefetchPolicy::Apply(std::list<CacheIndex>& toPrefetch, | |
| 145 CacheScheduler& cache, | |
| 146 const CacheIndex& accessed, | |
| 147 const std::string& content) | |
| 148 { | |
| 149 switch (accessed.GetBundle()) | |
| 150 { | |
| 151 case CacheBundle_SeriesInformation: | |
| 152 ApplySeries(toPrefetch, cache, accessed.GetItem(), content); | |
| 153 return; | |
| 154 | |
| 155 case CacheBundle_DecodedImage: | |
| 156 ApplyInstance(toPrefetch, cache, accessed.GetItem()); | |
| 157 return; | |
| 158 | |
| 159 default: | |
| 160 return; | |
| 161 } | |
| 162 } | |
| 163 } | |
| 164 |