/*

 * Copyright (c) 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:

 *

 */

#ifndef NMAPIMESSAGETASK_H_

#define NMAPIMESSAGETASK_H_

#include <QObject>

#include "nmenginedef.h"

/**

 * base class for async tasks

 */

class NMENGINE_EXPORT NmMessageTask : public QObject

{

    Q_OBJECT

protected:

    NmMessageTask( QObject *parent );

public:

    virtual ~NmMessageTask();

public slots:

    /*!

     * Starts task and returns true if starting succeeded.

     */

    virtual bool start()=0;

    /*!

     * Cancels started but not yet completed task. may not be applicable

     * in all tasks.

     */

    virtual void cancel() =0;

    signals:

    /*!

     * task failed, error code is specific to concrete task

     */

    void failed(int error);

    /*!

     * task canceled

     */

    void canceled();

};

#endif /* NMMESSAGETASK_H_ */