mpxplugins/serviceplugins/collectionplugins/inc/mpxdbactivetask.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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/*
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* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  Active object to split up long running tasks
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*
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*/
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#ifndef C_MPXDBACTIVETASK_H
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#define C_MPXDBACTIVETASK_H
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#include <mpxcommand.h>
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#include <mpxmessage2.h>
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/**
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* Observer class to the active task object
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*/
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NONSHARABLE_CLASS( MMPXDbActiveTaskObserver )
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    {
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public:
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    /**
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    * Handle the execution of a step
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    * @return ETrue if complete, EFalse if more to do
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    */
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    virtual TBool HandleStepL() = 0;
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    /**
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    * Handle the completion of the operation
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    */
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    virtual void HandleOperationCompleted( TInt aErr ) = 0;
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    };
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/**
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 *  Active object to execute tasks in multiple steps
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 *  Each collection plugin has its own task queue, which serializes all
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 *  operations for a plugin
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 *  @lib mpxdbplugin
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 *  @since S60
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 */
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NONSHARABLE_CLASS( CMPXDbActiveTask ) : public CActive
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    {
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public:
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    /**
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    * Two-phased constructor
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    */
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    IMPORT_C static CMPXDbActiveTask* NewL( MMPXDbActiveTaskObserver& aObserver );
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    /**
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    * Destructor
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    */
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    IMPORT_C virtual ~CMPXDbActiveTask();
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public:    // Accessor functions
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    /**
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    * Start the async command task
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    * @param aTask task id
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    * @param aCommand command for the operation
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    */
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    IMPORT_C void StartL( TMPXCommandId aTask, const CMPXCommand& aCommand );
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    /**
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    * Get the current step for the current task
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    * @return the current step
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    */
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    IMPORT_C TInt GetStep();
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    /*
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    * Get the command for the current task
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    * @return the current task
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    */
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    IMPORT_C TMPXCommandId GetTask();
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    /**
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    * Get the command for the current task
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    * @return the current command
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    */
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    IMPORT_C CMPXCommand& GetCommand();
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    /**
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    * Get the current change message array
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    * @return get the change messages
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    */
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    IMPORT_C CMPXMessageArray& GetChangeMessages();
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    enum TChangeVisibility
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        {
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        ENotVisibile,
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        ESingleVisible,
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        EAllVisible
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        };
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    /**
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    * Set if the change is visible
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    * @param aChange change state
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    */
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    IMPORT_C void SetVisibleChange( TChangeVisibility aChange );
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    /**
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    * Return if the change is visible
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    * @return visible change state
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    */
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    IMPORT_C TChangeVisibility GetVisibleChange();
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protected: // From base class
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    /**
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    * From CActive
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    */
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    IMPORT_C void RunL();
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    /**
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    * From CActive
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    */
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    IMPORT_C void DoCancel();
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    /**
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    * From CActive
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    */
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    IMPORT_C TInt RunError( TInt aError );
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private:
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    /**
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    * Default Constructor
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    */
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    CMPXDbActiveTask(MMPXDbActiveTaskObserver& aObserver);
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    /**
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    * 2nd-phase Constructor
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    */
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    void ConstructL();
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private: // data
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    CMPXCommand*  iCurCommand;  // Current Command
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    TMPXCommandId iCurTask;  // The task command id
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    TInt          iCurStep;  // The n-th stop in the operation
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    TChangeVisibility iCurVisibleChange; // Is the operation UI visible
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    CMPXMessageArray* iChangeMessages; // Change message array
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    MMPXDbActiveTaskObserver& iObserver; // Observer
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    };
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#endif // C_MPXDBACTIVETASK_H