--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Plugins/Engine/PluginsManager.cpp	Sat Jun 14 19:20:38 2014 +0200
@@ -0,0 +1,145 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege,
+ * Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * In addition, as a special exception, the copyright holders of this
+ * program give permission to link the code of its release with the
+ * OpenSSL project's "OpenSSL" library (or with modified versions of it
+ * that use the same license as the "OpenSSL" library), and distribute
+ * the linked executables. You must obey the GNU General Public License
+ * in all respects for all of the code used other than "OpenSSL". If you
+ * modify file(s) with this exception, you may extend this exception to
+ * your version of the file(s), but you are not obligated to do so. If
+ * you do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source files
+ * in the program, then also delete it here.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#include "PluginsManager.h"
+
+#include <glog/logging.h>
+#include <cassert>
+#include <memory>
+
+namespace Orthanc
+{
+  static void CallInitialize(SharedLibrary& plugin,
+                             const OrthancPluginContext& context)
+  {
+    typedef int32_t (*Initialize) (const OrthancPluginContext*);
+
+    /**
+     * gcc would complain about "ISO C++ forbids casting between
+     * pointer-to-function and pointer-to-object" without the trick
+     * below, that is known as "the POSIX.1-2003 (Technical Corrigendum
+     * 1) workaround". See the man page of "dlsym()".
+     * http://www.trilithium.com/johan/2004/12/problem-with-dlsym/
+     * http://stackoverflow.com/a/14543811/881731
+     **/
+
+    Initialize initialize;
+    *(void **) (&initialize) = plugin.GetFunction("OrthancPluginInitialize");
+    assert(initialize != NULL);
+
+    int32_t error = initialize(&context);
+
+    if (error != 0)
+    {
+      LOG(ERROR) << "Error while initializing plugin " << plugin.GetPath()
+                 << " (code " << error << ")";
+      throw OrthancException(ErrorCode_SharedLibrary);
+    }
+  }
+
+
+  static void CallFinalize(SharedLibrary& plugin)
+  {
+    typedef void (*Finalize) ();
+
+    Finalize finalize;
+    *(void **) (&finalize) = plugin.GetFunction("OrthancPluginFinalize");
+    assert(finalize != NULL);
+
+    finalize();
+  }
+
+
+  static void LogError(const char* str)
+  {
+    LOG(ERROR) << str;
+  }
+
+  static void LogWarning(const char* str)
+  {
+    LOG(WARNING) << str;
+  }
+
+  static void LogInfo(const char* str)
+  {
+    LOG(INFO) << str;
+  }
+
+  static int32_t InvokeService(const char* serviceName,
+                               const void* serviceParameters)
+  {
+    // TODO
+    return 0;
+  }
+
+  PluginsManager::PluginsManager()
+  {
+    context_.orthancVersion = ORTHANC_VERSION;
+    context_.InvokeService = InvokeService;
+    context_.LogError = LogError;
+    context_.LogWarning = LogWarning;
+    context_.LogInfo = LogInfo;
+  }
+
+  PluginsManager::~PluginsManager()
+  {
+    for (Plugins::iterator it = plugins_.begin(); it != plugins_.end(); it++)
+    {
+      if (*it != NULL)
+      {
+        CallFinalize(**it);
+        delete *it;
+      }
+    }
+  }
+
+  
+  void PluginsManager::RegisterPlugin(const std::string& path)
+  {
+    std::auto_ptr<SharedLibrary> plugin(new SharedLibrary(path));
+
+    if (!plugin->HasFunction("OrthancPluginInitialize") ||
+        !plugin->HasFunction("OrthancPluginFinalize"))
+    {
+      LOG(ERROR) << "Plugin " << plugin->GetPath()
+                 << " does not declare the proper entry functions";
+      throw OrthancException(ErrorCode_SharedLibrary);
+    }
+
+    LOG(WARNING) << "Registering plugin " << path;
+
+    CallInitialize(*plugin, context_);
+
+    plugins_.push_back(plugin.release());
+  }
+
+}