--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/datasourcemodules/gpspositioningmodule/lbsagpspsy/src/responsehandler/crefdatabus.cpp	Tue Feb 02 01:50:39 2010 +0200
@@ -0,0 +1,148 @@
+// 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());
+	}
+