/*

* 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:  Task queue observer

*

*/

#ifndef MMPXTASKQUEUEOBSERVER_H

#define MMPXTASKQUEUEOBSERVER_H

#include <e32base.h>

/**

*  Mix-in class for callback.

*

*  @lib MPXCommon.lib

*/

NONSHARABLE_CLASS( MMPXTaskQueueObserver )

    {

public:

    /**

    * Execute a task.

    *

    * @since S60 3.2.3

    * @param aTask task number

    * @param aParamData parameter

    * @param aPtrData pointer to any object

    * @param aBuf buffer containing externalized parameters for the task.

    * @param aCallback call back function pointer

    * @param aCObject1 object 1 owned by task queue

    * @param aCObject2 object 2 owned by task queue

    */

    virtual void ExecuteTask(TInt aTask,

                             TInt aParamData,

                             TAny* aPtrData,

                             const CBufBase& aBuf,

                             TAny* aCallback,

                             CBase* aCObject1,

                             CBase* aCObject2) = 0;

    /**

    * Indicates that the specified task was completed with an error. This may have happened

    * before the task was actually executed.

    *

    * @since S60 3.2.3

    * @param aTask task number

    * @param aPtrData pointer to any object

    * @param aCallback call back function pointer

    * @param aError error code

    */

    virtual void HandleTaskError(TInt /* aTask */,

                                 TAny* /*aPtrData*/,

                                 TAny* /*aCallback*/,

                                 TInt /* aError */){};

    };

#endif // MMPXTASKQUEUEOBSERVER_H