/*

* Copyright (c) 2005-2006 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:  Asynchronous callback service provider.

*

*/

#include "musuicallbackservice.h"

#include "musuicallbackobserver.h" // callback observer interface

#include "muslogger.h"

// -----------------------------------------------------------------------------

// Two-phased constructor.

// -----------------------------------------------------------------------------

//

CMusUiCallbackService* CMusUiCallbackService::NewL(

                        MMusUiCallbackObserver& aCallbackObserver )

    {

    CMusUiCallbackService* self =

                            new ( ELeave ) CMusUiCallbackService(

                                                    aCallbackObserver );

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop( self );

    return self;

    }

// -----------------------------------------------------------------------------

// Destructor.

// -----------------------------------------------------------------------------

//

CMusUiCallbackService::~CMusUiCallbackService()

    {

    // Cancel active object

    MUS_LOG( "mus: [MUSUI ]  -> CMusUiCallbackService::~CMusUiCallbackService" );

    Cancel();

    MUS_LOG( "mus: [MUSUI ]  <- CMusUiCallbackService::~CMusUiCallbackService" );

    }

// -----------------------------------------------------------------------------

// C++ default constructor.

// -----------------------------------------------------------------------------

//

CMusUiCallbackService::CMusUiCallbackService(

                        MMusUiCallbackObserver& aCallbackObserver )

    : CActive( EPriorityStandard ),

    iCallbackObserver( aCallbackObserver ),

    iEventId( EMusUiAsyncUninitialized )

    {

    CActiveScheduler::Add( this );

    }

// -----------------------------------------------------------------------------

//

// -----------------------------------------------------------------------------

//

void CMusUiCallbackService::ConstructL()

    {

    }

// -----------------------------------------------------------------------------

// Buffer a request to trigger an event.

// -----------------------------------------------------------------------------

//

void CMusUiCallbackService::AsyncEventL( TMusUiAsyncEvent aEventId )

    {

    MUS_LOG( "mus: [MUSUI ]  -> CMusUiCallbackService::AsyncEventL" );

    iEventId = aEventId;

    Activate();

    MUS_LOG( "mus: [MUSUI ]  <- CMusUiCallbackService::AsyncEventL" );

    }

// -----------------------------------------------------------------------------

// Cancels the active request.

// -----------------------------------------------------------------------------

//

void CMusUiCallbackService::Cancel()

    {

    MUS_LOG( "mus: [MUSUI ]  -> CMusUiCallbackService::Cancel" );

    CActive::Cancel();

    iStatus = NULL;

    MUS_LOG( "mus: [MUSUI ]  <- CMusUiCallbackService::Cancel" );

    }

// -----------------------------------------------------------------------------

// Check what event is currently pending.

// -----------------------------------------------------------------------------

//

TMusUiAsyncEvent CMusUiCallbackService::CurrentEvent() const

    {

    if ( IsActive() )

        {

        return iEventId;

        }

    return EMusUiAsyncUninitialized;

    }

// -----------------------------------------------------------------------------

// From CActive.  Called when a request completes.

// -----------------------------------------------------------------------------

//

void CMusUiCallbackService::RunL()

    {

    MUS_LOG( "mus: [MUSUI ]  -> CMusUiCallbackService::RunL" );

    if ( iEventId )

        {

        // Copy the id from member to local so the member can be cleared.

        TMusUiAsyncEvent eventId = iEventId;

        iEventId = EMusUiAsyncUninitialized;

        // Issue the call to the observer interface.

        iCallbackObserver.HandleAsyncEventL( eventId );

        MUS_LOG( "mus: [MUSUI ]  <- CMusUiCallbackService::RunL returns" );

        return;

        }

    MUS_LOG( "mus: [MUSUI ]  <- CMusUiCallbackService::RunL" );

    }

// -----------------------------------------------------------------------------

// From CActive.  Called when a leave occurres in RunL.

// -----------------------------------------------------------------------------

//

TInt CMusUiCallbackService::RunError( TInt aError )

    {

    MUS_LOG1( "mus: [MUSUI ]        CMusUiCallbackService::RunError [%d]",

                            aError );

    iCallbackObserver.HandleAsyncError( aError );

    return KErrNone;

    }

// -----------------------------------------------------------------------------

// From CActive.  Called when a request is cancelled.

// -----------------------------------------------------------------------------

//

void CMusUiCallbackService::DoCancel()

    {

    MUS_LOG( "mus: [MUSUI ]  -> CMusUiCallbackService::DoCancel" );

    MUS_LOG( "mus: [MUSUI ]  <- CMusUiCallbackService::DoCancel" );

    }

// -----------------------------------------------------------------------------

// Activate the object.

// -----------------------------------------------------------------------------

//

void CMusUiCallbackService::Activate()

    {

    MUS_LOG( "mus: [MUSUI ]  -> CMusUiCallbackService::Activate" );

    // Call SetActive() so RunL() will be called by the active scheduler

    if ( IsActive() )

        {

        Cancel();

        }

    SetPriority( EPriorityHigh );

    SetActive();

    iStatus = KRequestPending;

    TRequestStatus* stat = &iStatus;

    User::RequestComplete( stat, KErrNone );

    MUS_LOG( "mus: [MUSUI ]  <- CMusUiCallbackService::Activate" );

    }