Mercurial > hg > orthanc
annotate Plugins/Engine/PluginsManager.cpp @ 898:7000fc86fe62 plugins
improved plugin api
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 18 Jun 2014 09:18:28 +0200 |
parents | bafc9d592632 |
children | bb0a51561016 |
rev | line source |
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887 | 1 /** |
2 * Orthanc - A Lightweight, RESTful DICOM Store | |
3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege, | |
4 * Belgium | |
5 * | |
6 * This program is free software: you can redistribute it and/or | |
7 * modify it under the terms of the GNU General Public License as | |
8 * published by the Free Software Foundation, either version 3 of the | |
9 * License, or (at your option) any later version. | |
10 * | |
11 * In addition, as a special exception, the copyright holders of this | |
12 * program give permission to link the code of its release with the | |
13 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
14 * that use the same license as the "OpenSSL" library), and distribute | |
15 * the linked executables. You must obey the GNU General Public License | |
16 * in all respects for all of the code used other than "OpenSSL". If you | |
17 * modify file(s) with this exception, you may extend this exception to | |
18 * your version of the file(s), but you are not obligated to do so. If | |
19 * you do not wish to do so, delete this exception statement from your | |
20 * version. If you delete this exception statement from all source files | |
21 * in the program, then also delete it here. | |
22 * | |
23 * This program is distributed in the hope that it will be useful, but | |
24 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
26 * General Public License for more details. | |
27 * | |
28 * You should have received a copy of the GNU General Public License | |
29 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
30 **/ | |
31 | |
32 | |
33 #include "PluginsManager.h" | |
34 | |
894 | 35 #include "../../Core/Toolbox.h" |
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36 #include "../../Core/HttpServer/HttpOutput.h" |
894 | 37 |
887 | 38 #include <glog/logging.h> |
39 #include <cassert> | |
40 #include <memory> | |
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41 #include <boost/filesystem.hpp> |
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42 |
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43 #ifdef WIN32 |
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44 #define PLUGIN_EXTENSION ".dll" |
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45 #elif defined(__linux) |
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46 #define PLUGIN_EXTENSION ".so" |
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47 #else |
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48 #error Support your platform here |
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49 #endif |
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50 |
887 | 51 |
52 namespace Orthanc | |
53 { | |
54 static void CallInitialize(SharedLibrary& plugin, | |
55 const OrthancPluginContext& context) | |
56 { | |
57 typedef int32_t (*Initialize) (const OrthancPluginContext*); | |
58 | |
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59 #if defined(_WIN32) |
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60 Initialize initialize = (Initialize) plugin.GetFunction("OrthancPluginInitialize"); |
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61 #else |
887 | 62 /** |
63 * gcc would complain about "ISO C++ forbids casting between | |
64 * pointer-to-function and pointer-to-object" without the trick | |
65 * below, that is known as "the POSIX.1-2003 (Technical Corrigendum | |
66 * 1) workaround". See the man page of "dlsym()". | |
67 * http://www.trilithium.com/johan/2004/12/problem-with-dlsym/ | |
68 * http://stackoverflow.com/a/14543811/881731 | |
69 **/ | |
70 | |
71 Initialize initialize; | |
72 *(void **) (&initialize) = plugin.GetFunction("OrthancPluginInitialize"); | |
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73 #endif |
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74 |
887 | 75 assert(initialize != NULL); |
76 int32_t error = initialize(&context); | |
77 | |
78 if (error != 0) | |
79 { | |
80 LOG(ERROR) << "Error while initializing plugin " << plugin.GetPath() | |
81 << " (code " << error << ")"; | |
82 throw OrthancException(ErrorCode_SharedLibrary); | |
83 } | |
84 } | |
85 | |
86 | |
87 static void CallFinalize(SharedLibrary& plugin) | |
88 { | |
89 typedef void (*Finalize) (); | |
90 | |
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91 #if defined(_WIN32) |
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92 Finalize finalize = (Finalize) plugin.GetFunction("OrthancPluginFinalize"); |
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93 #else |
887 | 94 Finalize finalize; |
95 *(void **) (&finalize) = plugin.GetFunction("OrthancPluginFinalize"); | |
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96 #endif |
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97 |
887 | 98 assert(finalize != NULL); |
99 finalize(); | |
100 } | |
101 | |
102 | |
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103 static const char* CallGetName(SharedLibrary& plugin) |
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104 { |
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105 typedef const char* (*GetName) (); |
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106 |
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107 #if defined(_WIN32) |
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108 GetName getName = (GetName) plugin.GetFunction("OrthancPluginGetName"); |
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109 #else |
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110 GetName getName; |
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111 *(void **) (&getName) = plugin.GetFunction("OrthancPluginGetName"); |
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112 #endif |
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113 |
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114 assert(getName != NULL); |
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115 return getName(); |
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116 } |
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117 |
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118 |
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119 static const char* CallGetVersion(SharedLibrary& plugin) |
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120 { |
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121 typedef const char* (*GetVersion) (); |
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122 |
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123 #if defined(_WIN32) |
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124 GetVersion getVersion = (GetVersion) plugin.GetFunction("OrthancPluginGetVersion"); |
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125 #else |
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126 GetVersion getVersion; |
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127 *(void **) (&getVersion) = plugin.GetFunction("OrthancPluginGetVersion"); |
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128 #endif |
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129 |
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130 assert(getVersion != NULL); |
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131 return getVersion(); |
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132 } |
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133 |
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134 |
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135 int32_t PluginsManager::InvokeService(OrthancPluginContext* context, |
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136 OrthancPluginService service, |
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137 const void* parameters) |
887 | 138 { |
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139 switch (service) |
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140 { |
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141 case OrthancPluginService_LogError: |
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142 LOG(ERROR) << reinterpret_cast<const char*>(parameters); |
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143 return 0; |
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144 |
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145 case OrthancPluginService_LogWarning: |
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146 LOG(WARNING) << reinterpret_cast<const char*>(parameters); |
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147 return 0; |
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148 |
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149 case OrthancPluginService_LogInfo: |
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150 LOG(INFO) << reinterpret_cast<const char*>(parameters); |
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151 return 0; |
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152 |
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153 default: |
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154 break; |
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155 } |
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156 |
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157 PluginsManager* that = reinterpret_cast<PluginsManager*>(context->pluginsManager); |
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158 |
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159 if (that->HasServiceProvider() && |
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160 that->serviceProvider_->Handle(service, parameters)) |
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161 { |
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162 return 0; |
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163 } |
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164 |
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165 LOG(ERROR) << "Plugin invoking unknown service " << service; |
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166 return -1; |
887 | 167 } |
168 | |
169 | |
894 | 170 void PluginsManager::RegisterRestCallback(const OrthancPluginContext* context, |
896 | 171 const char* pathRegularExpression, |
172 OrthancPluginRestCallback callback) | |
887 | 173 { |
896 | 174 LOG(INFO) << "Plugin has registered a REST callback on: " << pathRegularExpression; |
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175 PluginsManager* manager = reinterpret_cast<PluginsManager*>(context->pluginsManager); |
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176 manager->restCallbacks_.push_back(std::make_pair(pathRegularExpression, callback)); |
887 | 177 } |
178 | |
894 | 179 |
896 | 180 static void AnswerBuffer(OrthancPluginRestOutput* output, |
894 | 181 const char* answer, |
182 uint32_t answerSize, | |
183 const char* mimeType) | |
184 { | |
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185 HttpOutput* translatedOutput = reinterpret_cast<HttpOutput*>(output); |
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186 translatedOutput->AnswerBufferWithContentType(answer, answerSize, mimeType); |
894 | 187 } |
188 | |
189 | |
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190 PluginsManager::PluginsManager() : |
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191 serviceProvider_(NULL) |
887 | 192 { |
894 | 193 memset(&context_, 0, sizeof(context_)); |
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194 context_.pluginsManager = this; |
887 | 195 context_.orthancVersion = ORTHANC_VERSION; |
894 | 196 context_.FreeBuffer = ::free; |
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197 context_.InvokeService = InvokeService; |
894 | 198 context_.RegisterRestCallback = RegisterRestCallback; |
199 context_.AnswerBuffer = AnswerBuffer; | |
887 | 200 } |
201 | |
202 PluginsManager::~PluginsManager() | |
203 { | |
204 for (Plugins::iterator it = plugins_.begin(); it != plugins_.end(); it++) | |
205 { | |
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206 if (it->second != NULL) |
887 | 207 { |
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208 LOG(WARNING) << "Unregistering plugin '" << CallGetName(*it->second) |
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209 << "' (version " << CallGetVersion(*it->second) << ")"; |
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210 |
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211 CallFinalize(*(it->second)); |
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212 delete it->second; |
887 | 213 } |
214 } | |
215 } | |
216 | |
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217 |
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218 static bool IsOrthancPlugin(SharedLibrary& library) |
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219 { |
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220 return (library.HasFunction("OrthancPluginInitialize") && |
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221 library.HasFunction("OrthancPluginFinalize") && |
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222 library.HasFunction("OrthancPluginGetName") && |
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223 library.HasFunction("OrthancPluginGetVersion")); |
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224 } |
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225 |
887 | 226 |
227 void PluginsManager::RegisterPlugin(const std::string& path) | |
228 { | |
229 std::auto_ptr<SharedLibrary> plugin(new SharedLibrary(path)); | |
230 | |
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231 if (!IsOrthancPlugin(*plugin)) |
887 | 232 { |
233 LOG(ERROR) << "Plugin " << plugin->GetPath() | |
234 << " does not declare the proper entry functions"; | |
235 throw OrthancException(ErrorCode_SharedLibrary); | |
236 } | |
237 | |
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238 std::string name(CallGetName(*plugin)); |
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239 if (plugins_.find(name) != plugins_.end()) |
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240 { |
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241 LOG(ERROR) << "Plugin '" << name << "' already registered"; |
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242 throw OrthancException(ErrorCode_SharedLibrary); |
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243 } |
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244 |
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245 LOG(WARNING) << "Registering plugin '" << name |
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246 << "' (version " << CallGetVersion(*plugin) << ")"; |
887 | 247 |
248 CallInitialize(*plugin, context_); | |
249 | |
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250 plugins_[name] = plugin.release(); |
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251 } |
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252 |
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253 |
889 | 254 void PluginsManager::ScanFolderForPlugins(const std::string& folder, |
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255 bool isRecursive) |
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256 { |
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257 using namespace boost::filesystem; |
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258 |
889 | 259 if (!exists(folder)) |
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260 { |
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261 return; |
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262 } |
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263 |
889 | 264 LOG(INFO) << "Scanning folder " << folder << " for plugins"; |
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265 |
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266 directory_iterator end_it; // default construction yields past-the-end |
889 | 267 for (directory_iterator it(folder); |
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268 it != end_it; |
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269 ++it) |
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270 { |
889 | 271 std::string path = it->path().string(); |
272 | |
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273 if (is_directory(it->status())) |
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274 { |
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275 if (isRecursive) |
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276 { |
889 | 277 ScanFolderForPlugins(path, true); |
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278 } |
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279 } |
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280 else |
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281 { |
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282 if (boost::filesystem::extension(it->path()) == PLUGIN_EXTENSION) |
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283 { |
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284 LOG(INFO) << "Found a shared library: " << it->path(); |
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285 |
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286 try |
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287 { |
889 | 288 SharedLibrary plugin(path); |
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289 if (IsOrthancPlugin(plugin)) |
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290 { |
889 | 291 RegisterPlugin(path); |
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292 } |
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293 } |
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294 catch (OrthancException&) |
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295 { |
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296 } |
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297 } |
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298 } |
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299 } |
887 | 300 } |
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301 |
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302 |
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303 IPluginServiceProvider& PluginsManager::GetServiceProvider() const |
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304 { |
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305 if (!HasServiceProvider()) |
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306 { |
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307 throw OrthancException(ErrorCode_BadRequest); |
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308 } |
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309 else |
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310 { |
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311 return *serviceProvider_; |
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312 } |
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313 } |
887 | 314 } |