diff -r 000000000000 -r 4e1aa6a622a0 sensorservices/sensorserver/inc/client/sensrvpropertyhandlerobserver.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sensorservices/sensorserver/inc/client/sensrvpropertyhandlerobserver.h	Tue Feb 02 00:53:00 2010 +0200
@@ -0,0 +1,76 @@
+/*
+* Copyright (c) 2006-2008 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:  Channel property observer.
+*
+*/
+
+
+#ifndef MSENSRVPROPERTYHANDLEROBSERVER_H
+#define MSENSRVPROPERTYHANDLEROBSERVER_H
+
+#include <e32base.h>
+#include "sensrvproperty.h"
+#include "sensrvtypes.h"
+
+
+/**
+ * Channel property observer. Callback interface to indicate when a property has been changed.
+ *  
+ * @lib SensrvClient.lib
+ * @since S60 5.0 
+ */
+
+class MSensrvPropertyHandlerObserver
+    {
+    public:
+    /**
+    * Notification about the changed value of a property.
+    *
+    * @since S60 5.0
+    * @param[in] aChangedProperty Changed property.
+    */  
+    virtual void PropertyChanged( const TSensrvProperty& aChangedProperty ) = 0;
+
+    /**
+    * Property listening failed.
+    * If error was fatal, channel has also been closed and sensor server session terminated.
+    * If error was minor, some property changes have potentially been missed.
+    *
+    * @since S60 5.0
+    * @param[in] aError Error code. 
+    */
+    virtual void PropertyError( TSensrvErrorSeverity aError ) = 0;
+    
+    /**
+    * Reopen channel.
+    * Data listening and condition listening need restarting
+    * 
+    * @since S60 5.0    
+    * @param aMaxBufferCount New maximum client buffer count
+    * @return void 
+    */
+    virtual void ReopenChannelForPropertyListeningL() = 0;
+    
+    /**
+    * Notification about change in property setting avaibility.
+    *
+    * @since S60 5.0
+    * @param[in] aIndication holds the new indicator value.
+    */
+    virtual void SetPropertySuccessIndicationChanged( 
+                 TSetPropertySuccessIndicator aIndication ) = 0;
+    
+    };
+
+#endif //MSENSRVPROPERTYHANDLEROBSERVER_H