--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancStone/Sources/Messages/IMessageEmitter.h	Tue Jul 07 16:21:02 2020 +0200
@@ -0,0 +1,47 @@
+/**
+ * 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/>.
+ **/
+
+
+#pragma once
+
+#include "IObserver.h"
+#include "IMessage.h"
+
+#include <boost/weak_ptr.hpp>
+
+namespace OrthancStone
+{
+  /**
+   This class may be used to customize the way the messages are sent between
+   a source and a destination, for instance by the ThreadedOracle.
+
+   See the concrete class LockingEmitter for an example of when it is useful.
+   */
+  class IMessageEmitter : public boost::noncopyable
+  {
+  public:
+    virtual ~IMessageEmitter()
+    {
+    }
+
+    virtual void EmitMessage(boost::weak_ptr<IObserver> observer,
+                             const IMessage& message) = 0;
+  };
+}