/*

* Copyright (c) 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:  Video Source subsystem.

*

*/

#ifndef C_ACTIVEWAIT_H

#define C_ACTIVEWAIT_H

// INCLUDE FILES

#include <e32base.h>

#include <e32svr.h>

/**

*  Active waiter class for waiting any active request. When asynchronous

*  request has been completed a given callback method will be called.

*

*  @lib videosource.lib

*/

template < class R > class CVSActiveWait: public CActive

    {

    private :

  			typedef void ( R::*TVSActiveWaitCallback) ( TInt );  		

    public : // Constructors and destructor

        /**

        * Constructor.

        * @param "aRequester" ?description

        */

        inline CVSActiveWait( R* aRequester );

        /**

        * Destructor.

        */

        inline ~CVSActiveWait();

        /**

        * Initializes the waiter class.

        * @param "aCallback" Pointer to callback method that will be called

        * when asynchronous request has been completed.

        */

        inline void InitializeWaiter( TVSActiveWaitCallback aCallback );

        /**

        * Returns pointer to this active object's TRequestStatus member

        * (iStatus).

        * @return Pointer to this classes TRequestStatus member (iStatus).

        */

        inline TRequestStatus* RequestStatus();

        /**

        * Signals waiter with given error code.

        * @param aError Integer error code.

        */

        inline void Signal( TInt aError );

    private :    // Functions from base classes

        /**

        * From CActive. See CActive for description.

        */

        inline void RunL();

        /**

        * From CActive. See CActive for description.

        */

        inline void DoCancel();

    private :    // Data

        // Pointer to requester. Callback method call will be made in this

        // context.

        R* iRequester; // not owned

        // Pointer to callback method.

        TVSActiveWaitCallback iCallback;

    };

#include "cactivewait.inl"

#endif      // C_ACTIVEWAIT_H