/*

* Copyright (c) 2007-2009 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:  

*

*/

#include <e32svr.h>

#include <harvestereventenum.h>

#include "harvestereventobserverao.h"

#include "harvesterclient.h"

const TInt KHarverterEventQueueSize = 32;

CHarvesterEventObserverAO::CHarvesterEventObserverAO( 

		RHarvesterClient& aHarvesterClient ) :

	CActive(CActive::EPriorityStandard), // Standard priority

	iHarvesterClient( aHarvesterClient )

	{

	}

CHarvesterEventObserverAO* CHarvesterEventObserverAO::NewLC( 

		RHarvesterClient& aHarvesterClient )

	{

	CHarvesterEventObserverAO* self = 

		new ( ELeave ) CHarvesterEventObserverAO( aHarvesterClient );

	CleanupStack::PushL(self);

	self->ConstructL();

	return self;

	}

CHarvesterEventObserverAO* CHarvesterEventObserverAO::NewL( 

		RHarvesterClient& aHarvesterClient )

	{

	CHarvesterEventObserverAO* self = 

		CHarvesterEventObserverAO::NewLC( aHarvesterClient );

	CleanupStack::Pop( self ); // self;

	return self;

	}

void CHarvesterEventObserverAO::ConstructL()

	{

	CActiveScheduler::Add( this ); // Add to scheduler

	}

CHarvesterEventObserverAO::~CHarvesterEventObserverAO()

	{

	Cancel(); // Cancel any request, if outstanding

	for(TInt i = iObservers.Count(); --i >= 0;)

		{

		THarvesterEventObserver& observer = *(iObservers[i]);

		TIpcArgs ipcArgs( observer.iObserverInfo.iObserverId, 

				iHarvesterEventQueue.Handle() );

		iHarvesterClient.Send( EUnregisterHarvesterEvent, ipcArgs );

		}

	iHarvesterEventQueue.Close();

	iObservers.ResetAndDestroy();

	}

void CHarvesterEventObserverAO::DoCancel()

	{

	iHarvesterEventQueue.CancelDataAvailable();

	}

void CHarvesterEventObserverAO::AddHarvesterEventObserverL( 

			MHarvesterEventObserver& aHarvesterEventObserver, 

			TInt aHEObserverType,

    		TInt aNotificationInterval )

	{

	RHandleBase& queueHandle = GetEventQueueHandleL();

	THarvesterEventObserver* observer = 

			new (ELeave) THarvesterEventObserver( aHarvesterEventObserver );

	CleanupStack::PushL( observer );

	// Init client side values

	observer->iObserverInfo.iQueueHandle = queueHandle.Handle();

	observer->iObserverInfo.iObserverId = NextObserverId();

	observer->iObserverInfo.iObserverType = aHEObserverType;

	observer->iObserverInfo.iNotificationInterval = aNotificationInterval;

	iObservers.AppendL( observer );

	CleanupStack::Pop( observer );

	TPckg<THarvesterEventObserverInfo> pckgObserverInfo( observer->iObserverInfo );

	TIpcArgs ipcArgs( &pckgObserverInfo, queueHandle );

	TInt err = iHarvesterClient.SendReceive( ERegisterHarvesterEvent, ipcArgs );

	User::LeaveIfError( err );

	if( !IsActive() )

		{

		iHarvesterEventQueue.NotifyDataAvailable( iStatus );

		SetActive(); // Tell scheduler a request is active

		}

	}

void CHarvesterEventObserverAO::RemoveHarvesterEventObserverL( 

		MHarvesterEventObserver& aHarvesterEventObserver )

	{

	// clear all observers which match to callback instance

	for(TInt i = iObservers.Count(); --i >= 0;)

		{

		THarvesterEventObserver* observer = iObservers[i];

		if( &observer->iObserver == &aHarvesterEventObserver )

			{

			TIpcArgs ipcArgs( observer->iObserverInfo.iObserverId, 

							iHarvesterEventQueue.Handle() );

			iHarvesterClient.Send( EUnregisterHarvesterEvent, ipcArgs );

			iObservers.Remove( i );

			delete observer;

			}

		}

	// close event queue if all observers are removed

	if( iObservers.Count() == 0 )

		{

		Cancel();

		iHarvesterEventQueue.Close();

		}

	iObservers.Compress();

	}

void CHarvesterEventObserverAO::RunL()

	{

	User::LeaveIfError( iStatus.Int() );

	THarvesterEventNotification received;

	while( iHarvesterEventQueue.Receive( received ) != KErrUnderflow )

		{

	    const TInt count( iObservers.Count() );

		for(TInt i = count; --i >= 0;)

			{

			THarvesterEventObserver& observer = *(iObservers[i]);

			if( observer.iObserverInfo.iObserverId == received.iObserverId )

				{

				observer.iObserver.HarvestingUpdated( received.iObserverType,  

						received.iCurrentState, received.iItemsLeft );

				break;

				}

			}

		}

	if( iObservers.Count() > 0 )

		{

		SetActive();

		iHarvesterEventQueue.NotifyDataAvailable( iStatus );

		}

	}

TInt CHarvesterEventObserverAO::RunError(TInt /*aError*/)

	{

	return KErrNone;

	}

TUint CHarvesterEventObserverAO::NextObserverId()

	{

	// Sort by observer IDs

	iObservers.Sort( TLinearOrder<THarvesterEventObserver>(

			THarvesterEventObserver::CompareObserverIds ) );

	// Find smallest unused observer ID 

	const TUint count = iObservers.Count();

	for( TInt i = count - 1; i >=0; i-- )

		{

		// Return first free observer ID 

		if( iObservers[i]->iObserverInfo.iObserverId != i )

			{

			return i;

			}

		}

	if( count )

	    {

	    // No free observer ID found, so return largest observer ID + 1 

	    return iObservers[count - 1]->iObserverInfo.iObserverId + 1;

	    }

	// No observer IDs assigned

	return 0;

	}

RHandleBase& CHarvesterEventObserverAO::GetEventQueueHandleL()

	{

	// create new message queue

	if( KNullHandle == iHarvesterEventQueue.Handle() )

		{

		TInt err = iHarvesterEventQueue.CreateGlobal( KNullDesC, KHarverterEventQueueSize );

		User::LeaveIfError( err );

		}

	return iHarvesterEventQueue;

	}