Mercurial > hg > orthanc-webviewer
comparison Plugin/ViewerPrefetchPolicy.cpp @ 0:02f7a0400a91
initial commit
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 25 Feb 2015 13:45:35 +0100 |
parents | |
children | 46ec13a1177c |
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-1:000000000000 | 0:02f7a0400a91 |
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1 /** | |
2 * Orthanc - A Lightweight, RESTful DICOM Store | |
3 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics | |
4 * Department, University Hospital of Liege, Belgium | |
5 * | |
6 * This program is free software: you can redistribute it and/or | |
7 * modify it under the terms of the GNU Affero General Public License | |
8 * as published by the Free Software Foundation, either version 3 of | |
9 * the License, or (at your option) any later version. | |
10 * | |
11 * This program is distributed in the hope that it will be useful, but | |
12 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 * Affero General Public License for more details. | |
15 * | |
16 * You should have received a copy of the GNU Affero General Public License | |
17 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 **/ | |
19 | |
20 | |
21 #include "ViewerPrefetchPolicy.h" | |
22 | |
23 #include "ViewerToolbox.h" | |
24 #include "Cache/CacheScheduler.h" | |
25 | |
26 #include <json/value.h> | |
27 #include <json/reader.h> | |
28 | |
29 | |
30 | |
31 static const Json::Value::ArrayIndex PREFETCH_FORWARD = 10; | |
32 static const Json::Value::ArrayIndex PREFETCH_BACKWARD = 3; | |
33 | |
34 | |
35 namespace OrthancPlugins | |
36 { | |
37 void ViewerPrefetchPolicy::ApplySeries(std::list<CacheIndex>& toPrefetch, | |
38 CacheScheduler& cache, | |
39 const std::string& series, | |
40 const std::string& content) | |
41 { | |
42 Json::Value json; | |
43 Json::Reader reader; | |
44 if (!reader.parse(content, json) || | |
45 !json.isMember("SortedInstances")) | |
46 { | |
47 return; | |
48 } | |
49 | |
50 const Json::Value& instances = json["SortedInstances"]; | |
51 if (instances.type() != Json::arrayValue) | |
52 { | |
53 return; | |
54 } | |
55 | |
56 for (Json::Value::ArrayIndex i = 0; | |
57 i < instances.size() && i < PREFETCH_FORWARD; | |
58 i++) | |
59 { | |
60 std::string item = "jpeg95-" + instances[i].asString(); | |
61 toPrefetch.push_back(CacheIndex(CacheBundle_DecodedImage, item)); | |
62 } | |
63 } | |
64 | |
65 | |
66 void ViewerPrefetchPolicy::ApplyInstance(std::list<CacheIndex>& toPrefetch, | |
67 CacheScheduler& cache, | |
68 const std::string& path) | |
69 { | |
70 size_t separator = path.find('-'); | |
71 if (separator == std::string::npos) | |
72 { | |
73 return; | |
74 } | |
75 | |
76 std::string compression = path.substr(0, separator + 1); | |
77 std::string instanceId = path.substr(separator + 1); | |
78 | |
79 Json::Value instance; | |
80 if (!GetJsonFromOrthanc(instance, context_, "/instances/" + instanceId) || | |
81 !instance.isMember("ParentSeries")) | |
82 { | |
83 return; | |
84 } | |
85 | |
86 std::string tmp; | |
87 if (!cache.Access(tmp, CacheBundle_SeriesInformation, instance["ParentSeries"].asString())) | |
88 { | |
89 return; | |
90 } | |
91 | |
92 Json::Value series; | |
93 Json::Reader reader; | |
94 if (!reader.parse(tmp, series) || | |
95 !series.isMember("SortedInstances")) | |
96 { | |
97 return; | |
98 } | |
99 | |
100 const Json::Value& instances = series["SortedInstances"]; | |
101 if (instances.type() != Json::arrayValue) | |
102 { | |
103 return; | |
104 } | |
105 | |
106 Json::Value::ArrayIndex position = 0; | |
107 while (position < instances.size()) | |
108 { | |
109 if (instances[position] == instanceId) | |
110 { | |
111 break; | |
112 } | |
113 | |
114 position++; | |
115 } | |
116 | |
117 if (position == instances.size()) | |
118 { | |
119 return; | |
120 } | |
121 | |
122 for (Json::Value::ArrayIndex i = position; | |
123 i < instances.size() && i < position + PREFETCH_FORWARD; | |
124 i++) | |
125 { | |
126 std::string item = compression + instances[i].asString(); | |
127 toPrefetch.push_back(CacheIndex(CacheBundle_DecodedImage, item)); | |
128 } | |
129 | |
130 for (Json::Value::ArrayIndex i = position; | |
131 i >= 0 && i > position - PREFETCH_BACKWARD; ) | |
132 { | |
133 i--; | |
134 std::string item = compression + instances[i].asString(); | |
135 toPrefetch.push_back(CacheIndex(CacheBundle_DecodedImage, item)); | |
136 } | |
137 } | |
138 | |
139 | |
140 void ViewerPrefetchPolicy::Apply(std::list<CacheIndex>& toPrefetch, | |
141 CacheScheduler& cache, | |
142 const CacheIndex& accessed, | |
143 const std::string& content) | |
144 { | |
145 switch (accessed.GetBundle()) | |
146 { | |
147 case CacheBundle_SeriesInformation: | |
148 ApplySeries(toPrefetch, cache, accessed.GetItem(), content); | |
149 return; | |
150 | |
151 case CacheBundle_DecodedImage: | |
152 ApplyInstance(toPrefetch, cache, accessed.GetItem()); | |
153 return; | |
154 | |
155 default: | |
156 return; | |
157 } | |
158 } | |
159 } | |
160 |