--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Messages/IObservable.cpp	Sun Nov 11 12:13:31 2018 +0100
@@ -0,0 +1,96 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2018 Osimis S.A., Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Affero General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * 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
+ * Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#include "IObservable.h"
+
+#include <Core/OrthancException.h>
+
+#include <cassert>
+
+namespace OrthancStone 
+{
+  IObservable::~IObservable()
+  {
+    // delete all callables (this will also unregister them from the broker)
+    for (Callables::const_iterator it = callables_.begin();
+         it != callables_.end(); ++it)
+    {
+      for (std::set<ICallable*>::const_iterator
+             it2 = it->second.begin(); it2 != it->second.end(); ++it2)
+      {
+        delete *it2;
+      }
+    }
+
+    // unregister the forwarders but don't delete them (they'll be
+    // deleted by the observable they are observing as any other
+    // callable)
+    for (Forwarders::iterator it = forwarders_.begin();
+         it != forwarders_.end(); ++it)
+    {
+      IMessageForwarder* fw = *it;
+      broker_.Unregister(dynamic_cast<IObserver&>(*fw));
+    }
+  }
+  
+
+  void IObservable::RegisterObserverCallback(ICallable* callable)
+  {
+    if (callable == NULL)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
+    }
+    
+    MessageType messageType = callable->GetMessageType();
+
+    callables_[messageType].insert(callable);
+  }
+
+  
+  void IObservable::EmitMessage(const IMessage& message)
+  {
+    Callables::const_iterator found = callables_.find(message.GetType());
+
+    if (found != callables_.end())
+    {
+      for (std::set<ICallable*>::const_iterator
+             it = found->second.begin(); it != found->second.end(); ++it)
+      {
+        assert(*it != NULL);
+        if (broker_.IsActive(*(*it)->GetObserver()))
+        {
+          (*it)->Apply(message);
+        }
+      }
+    }
+  }
+
+  
+  void IObservable::RegisterForwarder(IMessageForwarder* forwarder)
+  {
+    if (forwarder == NULL)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
+    }
+    
+    forwarders_.insert(forwarder);
+  }
+}