--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sensorservices/sensorserver/inc/client/sensrvchannelchangehandlerobserver.h	Tue Feb 02 00:53:00 2010 +0200
@@ -0,0 +1,63 @@
+/*
+* Copyright (c) 2007 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 change observer.
+*
+*/
+
+
+#ifndef MSENSRVCHANNELCHANGEHANDLEROBSERVER_H
+#define MSENSRVCHANNELCHANGEHANDLEROBSERVER_H
+
+#include <e32base.h>
+#include "sensrvtypes.h"
+
+
+/**
+ * Channel change observer. Callback interface to indicate when a channel has been 
+ * added or removed
+ *  
+ * @lib SensrvClient.lib
+ * @since S60 5.0 
+ */
+
+class MSensrvChannelChangeHandlerObserver
+    {
+    public:
+        /**
+        * Indicates channel availability change caused by installation or removal
+        * of new software. 
+        *
+        * @since S60 5.0
+        * @param[in] aDetectedChannel Channel information of the channel.
+        * @param[in] aChangeType If ESensrvChannelAdded, channel is a newly available
+        *                        channel. 
+        *                        If ESensrvChannelRemoved, channel was removed and is  
+        *                        no longer available.
+        */
+        virtual void ChannelChangeDetected( const TSensrvChannelInfo& aDetectedChannel,
+                                            TSensrvChannelChangeType aChangeType ) = 0;
+
+        /**
+        * Channel change listening failed.
+        * If error was fatal, sensor server session has also been terminated, and
+        * related finder is no longer usable.
+        * If error was minor, some notifications have potentially been lost.
+        *
+        * @since S60 5.0
+        * @param[in] aError Error code.
+        */
+        virtual void ChannelDetectionError( TSensrvErrorSeverity aError ) = 0;
+    };
+
+#endif //MSENSRVCHANNELCHANGEHANDLEROBSERVER_H