/*

* Copyright (c) 2004 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:   Definition of the event observer class

*

*/

#ifndef CLOUDNESSEVENTOBSERVER_H

#define CLOUDNESSEVENTOBSERVER_H

// INCLUDES

#include <e32base.h>

#include "LoudnessProxy.h"

// CLASS DECLARATION

/**

*  Loudness event observer provides encapsulates a monitoring request towards the message handler.

*

*  @lib LoudnessProxy.lib

*  @since 3.0

*/

class CLoudnessEventObserver : public CActive

    {

    public: // Constructors and destructor

        /**

        * Two-phased constructor.

        */

        static CLoudnessEventObserver* NewL(TMMFMessageDestinationPckg aMessageHandler, MCustomCommand& aCustomCommand,

        								  		  MLoudnessCallback& aCallback);

        /**

        * Destructor.

        */

        virtual ~CLoudnessEventObserver();

    public: // New functions

        /**

        * Start event monitoring

        * @since 3.0

        */

        void Start();

       	/**

        * Stop event monitoring

        * @since 3.0

        */

        void Stop();

    private:

        /**

        * C++ default constructor.

        */

        CLoudnessEventObserver();

        /**

        * By default Symbian 2nd phase constructor is private.

        */

        void ConstructL(TMMFMessageDestinationPckg aMessageHandler, MCustomCommand& aCustomCommand,

        				MLoudnessCallback& aCallback);

        void RunL();

        void DoCancel();

    private:

		// Pointer to custom command utility

		MCustomCommand* iCustomCommand;

		// Message handler handle

		TMMFMessageDestinationPckg iMessageHandler;

		// Loudness change event Callbacks

		MLoudnessCallback* iCallback;

		// Data package received from server

		TEfLoudnessDataPckg iDataPckgFrom;

		//

		TBool iStopped;

	};

#endif 		// CLOUDNESSEVENTOBSERVER_H