/*

* Copyright (c) 2006 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:  Data handler

*

*/

#ifndef CSENSRVDATAHANDLER_H

#define CSENSRVDATAHANDLER_H

#include <e32base.h>

#include "sensrvclient.h"

class MSensrvDataHandlerObserver;

/**

 *  Data handler class

 *

 *  @lib SensorClient.lib

 *  @since S60 5.0

 */

NONSHARABLE_CLASS( CSensrvDataHandler ) : public CActive

    {

    public:

        static CSensrvDataHandler* NewL( RSensrvClient& aSensrvClient, const TSensrvChannelInfo& aChannelInfo );

        static CSensrvDataHandler* NewLC( RSensrvClient& aSensrvClient, const TSensrvChannelInfo& aChannelInfo );

        virtual ~CSensrvDataHandler();

    public:

        /**

        * Start data listening. Send request to server.

        *

        * @since S60 5.0

        * @param aDataListener Data listener for channel.

        * @param aListeningParameters Listening parameters

        * @pararm aMaxBufferSize Maximum allowed buffer size

        */

        void StartListeningL( MSensrvDataHandlerObserver* aDataListener,

                             TSensrvStartListeningParameters aListeningParameters,

                             TInt aMaxBufferSize );

        /**

        * Get next data item.

        *

        * @since S60 5.0

        * @param aDataPtr Reference to pointer data to be written

        * @return TInt KErrNotFound if data buffer is empty.

        */

        TInt GetData( TDes8& aDataPtr );

    protected: // From CActive

          void DoCancel();

          void RunL();

          TInt RunError(TInt aError);

    private:

        CSensrvDataHandler( RSensrvClient& aSensrvClient,  const TSensrvChannelInfo& aChannelInfo  );

        void ConstructL();

        /**

        * Create and send request to server

        */

        void CreateAndSendRequest();

    private: // data

        /**

        * Client

        */

        RSensrvClient& iSensrvClient;

         /**

         * Data listener

         * Not own.

         */

        MSensrvDataHandlerObserver* iDataObserver;

        /**

         * Data listening parameters

         */

        TSensrvStartListeningParameters iListeningParameters;

        /**

         * Channel info

         */

        TSensrvChannelInfo iChannelInfo;

        /**

         *  Server write data to here

         * Own

         */

        HBufC8* iWriteBuffer;

        /**

         * Pointer to iWriteBuffer data

         * Own

         */

        TPtr8*  iWriteBufferPtr;

        /**

         * Client read data from here

         * Own

         */

        HBufC8* iReadBuffer;

        /**

         * Read buffer count

         */

        TInt iReadBufferCount;

        /**

         * Counter for data getting

         */

        TInt iGetDataCount;

        /**

         * Data count package

         */

        TSensrvAsyncChannelDataCountsRetvalPckgBuf iDataCountsPckgBuf;

        /**

         * Error count

         */

        TInt iErrorCount;

    };

#endif // CSENSRVDATAHANDLER_H