--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/taskswitcher/utils/inc/tsdataobserver.h	Thu Sep 16 12:11:40 2010 +0100
@@ -0,0 +1,44 @@
+/*
+* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:
+*
+*/
+#ifndef DATAOBSERVER_H
+#define DATAOBSERVER_H
+
+#include <e32base.h>
+
+class MTsDataObserver {
+public:
+    virtual void DataChanged() =0;
+};
+
+class CTsDataObserver: public CBase,
+                       public MTsDataObserver
+{
+public:
+    virtual void Cancel(const RMessage2& reason) =0;
+    virtual TBool IsParent(const CSession2 *session) =0;
+};
+
+class MTsDataObserverStorage
+{
+public:
+    virtual void PushL(CTsDataObserver*) =0;
+    virtual void Pop(CTsDataObserver*) =0;
+    virtual void Cancel(const RMessage2& reason) =0;
+    virtual void Invalidate(const CSession2* session) =0; 
+};
+
+#endif //DATAOBSERVER_H