/*

* 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: Implementation of the Data Source Class.

*

*/

#include "glxdatasource.h"

#include <glxsingletonstore.h>

#include <glxpanic.h>

#include <glxtracer.h>

#include "glxdatasourcetask.h"

#include "mglxdatasourceupdateobserver.h"

#include "mglxdatasourcerequestobserver.h"

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

// CDataSourceArrayOwner::InstanceL

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

//

CDataSourceArrayOwner* CDataSourceArrayOwner::InstanceL() 

	{

    TRACER("CDataSourceArrayOwner::InstanceL()");

    return CGlxSingletonStore::InstanceL(&NewL);

    }

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

// CDataSourceArrayOwner::Close

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

//

void CDataSourceArrayOwner::Close() 

   {

    TRACER("void CDataSourceArrayOwner::Close()");

   CGlxSingletonStore::Close(this);

   }

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

// CDataSourceArrayOwner::Array

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

//

RPointerArray<CGlxDataSource>& CDataSourceArrayOwner::Array()

	{

    TRACER("CDataSourceArrayOwner::Array()");

    return iDataSources;

	}

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

// CDataSourceArrayOwner::NewL

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

//

CDataSourceArrayOwner* CDataSourceArrayOwner::NewL() 

   {

    TRACER("CDataSourceArrayOwner* CDataSourceArrayOwner::NewL()");

   return new (ELeave) CDataSourceArrayOwner();

   }

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

// CDataSourceArrayOwner::~CDataSourceArrayOwner

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

//

CDataSourceArrayOwner::~CDataSourceArrayOwner()

   {

    TRACER("CDataSourceArrayOwner::~CDataSourceArrayOwner()");

   iDataSources.Close();

   }    

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

// Constructor

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

//

EXPORT_C CGlxDataSource::CGlxDataSource()

    : CActive(EPriorityStandard)

    {

    TRACER("EXPORT_C CGlxDataSource::CGlxDataSource()");

    CActiveScheduler::Add(this);

    }

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

// MGlxDataSource::OpenDataSourceL

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

//

EXPORT_C MGlxDataSource* MGlxDataSource::OpenDataSourceL(const TUid& aDataSource, MGlxDataSourceUpdateObserver& aObserver)

	{

    TRACER("MGlxDataSource* MGlxDataSource::OpenDataSourceL()");

	CDataSourceArrayOwner* dsArrayOwner = CDataSourceArrayOwner::InstanceL();

	CleanupClosePushL(*dsArrayOwner);

	RPointerArray<CGlxDataSource>& dataSoruceArray = dsArrayOwner->Array();

	CGlxDataSource* dataSource = NULL;

	if (dataSoruceArray.Count())

		{

		for (TInt i = 0;i < dataSoruceArray.Count(); i++)

			{

			if (dataSoruceArray[i]->Uid() == aDataSource)

				{

				dataSource = dataSoruceArray[i];

				dataSource->AddObserverL(aObserver);

				break;

				}

			}

		}

	if (!dataSource)

		{

		REComSession ecomSession = REComSession::OpenL();

		CleanupClosePushL(ecomSession);

		TUid dtorKey;

		dataSource = reinterpret_cast<CGlxDataSource*>(

           REComSession::CreateImplementationL(aDataSource, dtorKey));

        CleanupStack::PushL(dataSource);

        dataSoruceArray.AppendL(dataSource);

        dataSource->SetUid(aDataSource);

        dataSource->SetDtorKey(dtorKey);

        dataSource->AddObserverL(aObserver);

        CleanupStack::Pop(dataSource);

        dataSource->SetEComSession(ecomSession);

        CleanupStack::Pop(&ecomSession);

        dataSource->SetDataSourceArrayOwner(dsArrayOwner);

        CleanupStack::Pop(dsArrayOwner);

		}

	else

		{

		CleanupStack::PopAndDestroy(dsArrayOwner);

		}

    return dataSource;

	}

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

// CGlxDataSource::Close

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

//

EXPORT_C void CGlxDataSource::Close(MGlxDataSourceUpdateObserver& aObserver)

	{

    TRACER("void CGlxDataSource::Close(MGlxDataSourceUpdateObserver& aObserver)");

	TInt observer = iDataSourceObservers.Find(&aObserver);

	__ASSERT_DEBUG(observer !=KErrNotFound, Panic(EGlxPanicLogicError)); // Closing non-existant observer

	iDataSourceObservers.Remove(observer);

	if (iDataSourceObservers.Count() == 0)

		{

		RPointerArray<CGlxDataSource>& dataSourceArray = iDataSourceArrayOwner->Array();

		TInt dataSource = dataSourceArray.Find(this);

		__ASSERT_DEBUG(dataSource !=KErrNotFound, Panic(EGlxPanicLogicError)); // Closing non-existant observer

		dataSourceArray.Remove(dataSource);

		REComSession ecomSession = iEComSession;

		TInt count = dataSourceArray.Count();

		delete this;

		if (count == 0)

			{

			ecomSession.Close();

			}

		}	

	}

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

// CGlxDataSource::~CGlxDataSource

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

//

EXPORT_C CGlxDataSource::~CGlxDataSource()

	{

    TRACER("EXPORT_C CGlxDataSource::~CGlxDataSource()");

    Cancel();

	iDataSourceObservers.Close();

    REComSession::DestroyedImplementation(iDtorKey);

    iTasks.ResetAndDestroy();

	iDataSourceArrayOwner->Close();

	}

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

// CGlxDataSource::AddObserverL

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

//

void CGlxDataSource::AddObserverL(MGlxDataSourceUpdateObserver& aObserver)

	{

    TRACER("void CGlxDataSource::AddObserverL(MGlxDataSourceUpdateObserver& aObserver)");

	iDataSourceObservers.AppendL(&aObserver);

	}

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

// CGlxDataSource::RunL

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

//

EXPORT_C void CGlxDataSource::RunL()

    {

    TRACER("void CGlxDataSource::RunL()");

    TAction action = static_cast<TAction>(iStatus.Int());

    switch (action)

        {

        case ECleanupAndExecute:

            {

            delete iTasks[0];

            iTasks.Remove(0);

            TaskCompletedL();

            }

        // Don't break - fall through 

        case EExecuteOnly:

            {

            if ( (iTasks.Count() > 0) && ( iDataSourceReady || !iTasks[0]->IsDataSourceNeeded() ) )

                {

                TaskStartedL();

                iTasks[0]->ExecuteRequestL(); // Execute the oldest request

                }

            }

        break;

        }

    }

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

// CGlxDataSource::DoCancel

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

//

EXPORT_C void CGlxDataSource::DoCancel()

    {

    TRACER("void CGlxDataSource::DoCancel()");

    // CActive::Cancel() will wait for the request to complete.

    // It is not necessary to take any action here.

    }

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

// CGlxDataSource::RunError

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

//

EXPORT_C TInt CGlxDataSource::RunError(TInt aError)

    {

    TRACER("TInt CGlxDataSource::RunError(TInt aError)");

    __ASSERT_DEBUG(iTasks.Count() > 0, Panic(EGlxPanicLogicError));

    iTasks[0]->HandleRequestComplete(aError);

    return KErrNone;

    }

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

// CGlxDataSource::CompleteSelf

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

//

void CGlxDataSource::CompleteSelf(TAction aAction)

    {

    TRACER("void CGlxDataSource::CompleteSelf(TAction aAction)");

    TRequestStatus* status=&iStatus;

    User::RequestComplete(status, aAction);

    SetActive();    

    }

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

// CGlxDataSource::DataSourceRequestL

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

//

EXPORT_C void CGlxDataSource::DataSourceRequestL(CGlxRequest* aRequest, MGlxDataSourceRequestObserver& aObserver)

	{

    TRACER("void CGlxDataSource::DataSourceRequestL()");

	CGlxDataSourceTask* newRequest = CreateTaskL(aRequest, aObserver);

	iTasks.AppendL(newRequest);

	TryStartTask();

	}

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

// CGlxDataSource::TryStartTask

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

//

EXPORT_C void CGlxDataSource::TryStartTask(TBool aFirstStart)

	{

    TRACER("void CGlxDataSource::TryStartTask(TBool aFirstStart)");

	if ( ( aFirstStart ? iTasks.Count() >= 1 : iTasks.Count() == 1 ) && !IsActive() )

    // There is one request i.e. it was just added by the call to AppendL() above and we are not waiting 

    // for a an existing request to complete. If we are waiting for a request to complete then the request 

    // we have just added will run later.

		{

        CompleteSelf(EExecuteOnly);

		}

	}

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

// CGlxDataSource::HandleTaskComplete

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

//

EXPORT_C void CGlxDataSource::HandleTaskComplete(CGlxDataSourceTask* aRequest)

	{

    TRACER("void CGlxDataSource::HandleTaskComplete(CGlxDataSourceTask* aRequest)");

	__ASSERT_DEBUG(iTasks.Find(aRequest) == 0, Panic( EGlxPanicLogicError )); // The only request that should be executing is the 0th request in the array.

    CompleteSelf(ECleanupAndExecute);

	}

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

// CGlxDataSource::CancelRequest

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

//

EXPORT_C void CGlxDataSource::CancelRequest(MGlxDataSourceRequestObserver& aObserver)

	{

    TRACER("void CGlxDataSource::CancelRequest(MGlxDataSourceRequestObserver& aObserver)");    

    for (TInt i = 0; i < iTasks.Count(); i++)

		{

		if (iTasks[i]->ObserverMatch(aObserver))

			{            

            if (i == 0) // Cancel the active request

                {

                if (!IsActive())

                    {

                    // We can only cancel the request if it is currently executing. The active object being

                    // active indicates that the request has not yet started or has already completed.

                    iTasks[0]->CancelRequest();

                    }

                Cancel();

                CompleteSelf(ECleanupAndExecute);

                }

            else // The request is waiting to be executed - just remove it from the queue.

                {

                delete iTasks[i];

                iTasks.Remove(i);

                }

            break;

			}

		}

	}

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

// CGlxDataSource::BroadcastMessage

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

//

EXPORT_C void CGlxDataSource::BroadcastMessage(CMPXMessage& aMessage)

	{

    TRACER("void CGlxDataSource::BroadcastMessage(CMPXMessage& aMessage)");

	__ASSERT_DEBUG(iDataSourceObservers.Count(), Panic(EGlxPanicLogicError));

	// There should always be at least 1 observer because they are passed in

	// when the object is instatiated.

	iDataSourceObservers[0]->HandleMessage(aMessage);

	}