/*

* Copyright (c) 2007-2009 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:

* Name          : sipsystemstateobserver.h

* Part of       : SIP

* Version       : SIP/6.0 

*

*/

#ifndef MSIPSYSTEMSTATEOBSERVER_H

#define MSIPSYSTEMSTATEOBSERVER_H

// INCLUDES

#include "sipsystemstatemonitor.h"

#include <e32std.h>

// CLASS DECLARATION

/**

* @publishedPartner

* @released

*

* Callback to receive notifications about changes 

* in the values of system variables.

*/

class MSipSystemStateObserver

	{

	public:

		/**

		* The value of a system variable has changed.

		* @param aVariable the identifier of a system variable that has changed

        * @param aObjectId identifies the monitored object		

		* @param aValue the value of the variable

		*/

		virtual void SystemVariableUpdated( 

		    CSipSystemStateMonitor::TSystemVariable aVariable,

		    TInt aObjectId,

		    TInt aValue ) = 0;

	};

#endif // MSIPSYSTEMSTATEOBSERVER_H