/*

* Copyright (c) 2006-2007 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:  Processor object for running queued tasks

 *

*/

#ifndef THUMBNAILTASKPROCESSOR_H

#define THUMBNAILTASKPROCESSOR_H

#include "thumbnailmanager.h"    // TThumbnailFlags

#include "thumbnailmanagerconstants.h" // TThumbnailServerRequestId

#include "thumbnailprovider.h"

#include <e32property.h>

class CThumbnailTask;

/**

 *  Processor object for running queued tasks.

 *

 *  @since S60 v5.0

 */

class CThumbnailTaskProcessor: public CActive

    {

public:

    /**

     * Two-phased constructor.

     *

     * @since S60 v5.0

     * @return Instance of CThumbnailTaskProcessor.

     */

    static CThumbnailTaskProcessor* NewL();

    /**

     * Destructor

     *

     * @since S60 v5.0

     */

    virtual ~CThumbnailTaskProcessor();

    /**

     * Adds new task to the task queue.

     *

     * @since S60 v5.0

     * @param aTask Task to be added to the queue.

     */

    void AddTaskL( CThumbnailTask* aTask );

    /**

     * Removes specific task from the queue.

     *

     * @since S60 v5.0

     * @param aRequestId ID of the task to be removed.

     */

    TInt RemoveTask( const TThumbnailServerRequestId& aRequestId );

    /**

     * Removes specific task from the queue.

     *

     * @since S60 v5.0

     * @param aSession Identifier for task to be removed.

     */

    void RemoveTasks( CThumbnailServerSession* aSession );

    /**

     * Removes all tasks from the queue.

     *

     * @since S60 v5.0

     */

    void RemoveAllTasks();

    /**

     * Changes priority of a task.

     *

     * @since S60 v5.0

     * @param aRequestId ID of the task.

     * @param aNewPriority New priority to be assigned to the task.

     */

    TInt ChangeTaskPriority( const TThumbnailServerRequestId& aRequestId, const

        TInt aNewPriority );

    /**

     * Marks task to completed.

     *

     * @since S60 v5.0

     * @param aTask Completed task.

     */

    void TaskComplete( CThumbnailTask* aTask );

    void SetDaemonAsProcess(TBool aValue);

protected:

    // from base class CActive

    /**

     * Handles an active object's request completion event.

     *

     * @since S60 v5.0

     */

    void RunL();

    /**

     * Implements cancellation of an outstanding request.

     *

     * @since S60 v5.0

     */

    void DoCancel();

    /**

     * Handles a leave occurring in the request completion event handler

     * RunL().

     *

     * @since S60 v5.0

     * @return Error code.

     */

    TInt RunError( TInt aError );

private:

    /**

     * C++ default constructor

     *

     * @since S60 v5.0

     * @return Instance of CThumbnailTaskProcessor.

     */

    CThumbnailTaskProcessor();

    /**

     * Symbian 2nd phase constructor can leave.

     *

     * @since S60 v5.0

     */

    void ConstructL();

    /**

     * Callback for harvesting complete timer

     *

     * @since S60 v5.0

     */

    static TInt PeriodicTimerCallBack(TAny* aAny);

private:

    // data

    /**

     * Task queue. Task objects are own by this class.

     * Own.

     */

    RPointerArray < CThumbnailTask > iTasks;

    /**

     * Current active task. Not own.

     */

    CThumbnailTask* iActiveTask;

    /**

     * PS used to notify Daemon when server is idle 

     */

    RProperty iProperty;

    /**

     * Holds current idle value

     */

    TBool iIdle;

    CPeriodic* iPeriodicTimer;

    TBool iTimerActive;

    TBool iIsDaemonAsProcess;

};

#endif // THUMBNAILTASKPROCESSOR_H