/*

* 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 data observer.

*

*/

#ifndef MSENSRVDATAHANDLEROBSERVER_H

#define MSENSRVDATAHANDLEROBSERVER_H

#include <e32base.h>

#include "sensrvtypes.h"

/**

 *  Channel data observer. Callback interface to indicate when a new data is 

 *  available.

 * 

 *  @lib SensrvClient.lib

 *  @since S60 5.0  

 */

class MSensrvDataHandlerObserver

    {

      public:

        /**

        * Indicates data is available in the receiving buffer

        *

        * @since S60 5.0

        * @param aCount Data count in receiving buffer

        * @param aDataLost Data lost count

        * @return void

        */  

        virtual void DataReceived( TInt aCount, TInt aDataLost ) = 0;

        /**

        * Data listening failed. 

        * If error was fatal, channel has also been closed and sensor server 

        * session terminated.

        * If error was minor, some data has potentially been lost.

        *

        * @since S60 5.0        

        * @param aError Error code.

        * @return void 

        */

        virtual void DataError( TSensrvErrorSeverity aError ) = 0;

        /**

        * Reopen channel.

        * Property listening and condition listening need restarting

        * 

        * @since S60 5.0        

        * @param aMaxBufferCount New maximum client buffer count

        * @return void 

        */

        virtual void ReopenChannelForDataListeningL( TInt& aMaxBufferCount ) = 0;

    };

#endif //MSENSRVDATAHANDLEROBSERVER_H