// Copyright (c) 2008-2009 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:

//

/**

 @file

 @InternalComponent

*/

#include "crefdatabus.h"

#include "lbsdevloggermacros.h"

#include "mdatabusobserver.h"

#ifdef _DEBUG

_LIT(KRefDataBus, "CRefDataBus");

#endif

/**

Create a reference data bus, this should be called from the location cache

@return The pointer to the reference data bus

@see CLocationCache

*/

CRefDataBus* CRefDataBus::NewL(MDataBusObserver& aObserver)	

	{

	CRefDataBus* self = new (ELeave) CRefDataBus(aObserver);

	CleanupStack::PushL(self);

	self->ConstructL();

	CleanupStack::Pop(self);

	return self;

	} 

/**

constructor, note the reference data bus is owned by location cache and used by CRequestQ, and it is a module-based CActive object.

Set the data bus as standard priority by default.

Add itself to Active Scheduler

@see CRequestQ

@see CLocationCache

*/

CRefDataBus::CRefDataBus(MDataBusObserver& aObserver) : CActive(CActive::EPriorityStandard), iObs(aObserver)

	{

	CActiveScheduler::Add(this);

	}

/**

Open the RProperty object wrappered by the data bus.

Reference data bus is implemented as Publish & Subscribe mechanism.

*/

void CRefDataBus::ConstructL()

	{

	iRefDataBus.OpenL(RLbsNetworkPositionUpdates::ENetworkPositionReference);

	}

/**

Cancel any outstanding request to the CActive object.

Close the RProperty.

*/

CRefDataBus::~CRefDataBus()

	{

	Cancel();

	iRefDataBus.Close();

	}

/**

Subscribe to the data bus. It will be called by objects which listen to the data bus.

It will eventually call RProperty::Subscribe()

Set active the data bus active object

Panic if there are no data bus observers already set.

*/

void CRefDataBus::Subscribe()

	{

	if(!IsActive())

		{

		iRefDataBus.NotifyNetworkLocationUpdate(iStatus);

		SetActive();

		}

	}

/**

Cancel the subscribe to the data bus. Cancel any outstanding request to the CActive object.

Panic if there are no data bus observers already set.

*/

void CRefDataBus::UnSubscribe()

	{

	Cancel();

	}

/**

Get the last position from the bus 

 */

TInt CRefDataBus::GetLastPositionInfo(TPositionInfo& aRefInfo, TTime& aActualTime)

	{

	TLbsNetSessionIdInt sessionId;

	TTime targetTime;

	TInt error = iRefDataBus.GetPositionInfo(sessionId, aRefInfo, targetTime, aActualTime);

	return error;

	}

/**

from CActive, the main event processing loop

Whenever there is a new event, i.e. the position info data is published to the data bus, notify the data bus observer by ReferenceDataAvailableL()

*/

void CRefDataBus::RunL()

	{

	TLbsNetSessionIdInt sessionId;//Not used

	TTime targetTime;

	TTime actualTime;

	TInt error = iRefDataBus.GetPositionInfo(sessionId, iPositionInfo, targetTime, actualTime);

	iObs.DataUpdate(iPositionInfo, iStatus.Int(), error, actualTime);

	}

/**

from CActive

Cancels the request for position update notification

It will eventually cancel an outstanding subscription request for this property handle.

*/

void CRefDataBus::DoCancel()

	{

	iRefDataBus.CancelNotifyNetworkLocationUpdate();

	}

/**

from CActive

Simply fwds any errors to the observers

*/

TInt CRefDataBus::RunError(TInt aError)

	{

	return iObs.DataError(aError, iStatus.Int());

	}