--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancStone/Sources/Messages/IObservable.cpp	Tue Jul 07 16:21:02 2020 +0200
@@ -0,0 +1,123 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2020 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 "../StoneException.h"
+
+#include <Logging.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;
+      }
+    }
+  }
+  
+
+  void IObservable::RegisterCallable(ICallable* callable)
+  {
+    if (callable == NULL)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
+    }
+    
+    const MessageIdentifier& id = callable->GetMessageIdentifier();
+    callables_[id].insert(callable);
+  }
+
+  void IObservable::EmitMessageInternal(const IObserver* receiver,
+                                        const IMessage& message)
+  {
+    //LOG(TRACE) << "IObservable::EmitMessageInternal receiver = " << std::hex << receiver << std::dec;
+    Callables::const_iterator found = callables_.find(message.GetIdentifier());
+
+    if (found != callables_.end())
+    {
+      for (std::set<ICallable*>::const_iterator
+             it = found->second.begin(); it != found->second.end(); ++it)
+      {
+        assert(*it != NULL);
+
+        boost::shared_ptr<IObserver> observer((*it)->GetObserver().lock());
+
+        if (observer)
+        {
+          if (receiver == NULL ||    // Are we broadcasting?
+              observer.get() == receiver)  // Not broadcasting, but this is the receiver
+          {
+            try
+            {
+              (*it)->Apply(message);
+            }
+            catch (Orthanc::OrthancException& e)
+            {
+              LOG(ERROR) << "Exception on callable: " << e.What();
+            }
+            catch (StoneException& e)
+            {
+              LOG(ERROR) << "Exception on callable: " << e.What();
+            }
+            catch (...)
+            {
+              LOG(ERROR) << "Native exception on callable";
+            }
+          }
+        }
+        else
+        {
+          // TODO => Remove "it" from the list of callables => This
+          // allows to suppress the need for "Unregister()"
+        }
+      }
+    }
+  }
+
+
+  void IObservable::BroadcastMessage(const IMessage& message)
+  {
+    EmitMessageInternal(NULL, message);
+  }
+
+  
+  void IObservable::EmitMessage(boost::weak_ptr<IObserver> observer,
+                                const IMessage& message)
+  {
+    //LOG(TRACE) << "IObservable::EmitMessage observer = " << std::hex << observer.get() << std::dec;
+
+    boost::shared_ptr<IObserver> lock(observer.lock());
+    if (lock)
+    {
+      EmitMessageInternal(lock.get(), message);
+    }
+  }
+}