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comparison Plugins/Engine/PluginsManager.cpp @ 887:4066e6f2d134 plugins

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PluginsManager
author Sebastien Jodogne <s.jodogne@gmail.com>
date Sat, 14 Jun 2014 19:20:38 +0200
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children d44b845c1c89
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886:29087d728e0a 887:4066e6f2d134
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
35 #include <glog/logging.h>
36 #include <cassert>
37 #include <memory>
38
39 namespace Orthanc
40 {
41 static void CallInitialize(SharedLibrary& plugin,
42 const OrthancPluginContext& context)
43 {
44 typedef int32_t (*Initialize) (const OrthancPluginContext*);
45
46 /**
47 * gcc would complain about "ISO C++ forbids casting between
48 * pointer-to-function and pointer-to-object" without the trick
49 * below, that is known as "the POSIX.1-2003 (Technical Corrigendum
50 * 1) workaround". See the man page of "dlsym()".
51 * http://www.trilithium.com/johan/2004/12/problem-with-dlsym/
52 * http://stackoverflow.com/a/14543811/881731
53 **/
54
55 Initialize initialize;
56 *(void **) (&initialize) = plugin.GetFunction("OrthancPluginInitialize");
57 assert(initialize != NULL);
58
59 int32_t error = initialize(&context);
60
61 if (error != 0)
62 {
63 LOG(ERROR) << "Error while initializing plugin " << plugin.GetPath()
64 << " (code " << error << ")";
65 throw OrthancException(ErrorCode_SharedLibrary);
66 }
67 }
68
69
70 static void CallFinalize(SharedLibrary& plugin)
71 {
72 typedef void (*Finalize) ();
73
74 Finalize finalize;
75 *(void **) (&finalize) = plugin.GetFunction("OrthancPluginFinalize");
76 assert(finalize != NULL);
77
78 finalize();
79 }
80
81
82 static void LogError(const char* str)
83 {
84 LOG(ERROR) << str;
85 }
86
87 static void LogWarning(const char* str)
88 {
89 LOG(WARNING) << str;
90 }
91
92 static void LogInfo(const char* str)
93 {
94 LOG(INFO) << str;
95 }
96
97 static int32_t InvokeService(const char* serviceName,
98 const void* serviceParameters)
99 {
100 // TODO
101 return 0;
102 }
103
104 PluginsManager::PluginsManager()
105 {
106 context_.orthancVersion = ORTHANC_VERSION;
107 context_.InvokeService = InvokeService;
108 context_.LogError = LogError;
109 context_.LogWarning = LogWarning;
110 context_.LogInfo = LogInfo;
111 }
112
113 PluginsManager::~PluginsManager()
114 {
115 for (Plugins::iterator it = plugins_.begin(); it != plugins_.end(); it++)
116 {
117 if (*it != NULL)
118 {
119 CallFinalize(**it);
120 delete *it;
121 }
122 }
123 }
124
125
126 void PluginsManager::RegisterPlugin(const std::string& path)
127 {
128 std::auto_ptr<SharedLibrary> plugin(new SharedLibrary(path));
129
130 if (!plugin->HasFunction("OrthancPluginInitialize") ||
131 !plugin->HasFunction("OrthancPluginFinalize"))
132 {
133 LOG(ERROR) << "Plugin " << plugin->GetPath()
134 << " does not declare the proper entry functions";
135 throw OrthancException(ErrorCode_SharedLibrary);
136 }
137
138 LOG(WARNING) << "Registering plugin " << path;
139
140 CallInitialize(*plugin, context_);
141
142 plugins_.push_back(plugin.release());
143 }
144
145 }