engine/collectionframework/datasource/manager/src/glxdatasource.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 19 Mar 2010 09:28:59 +0200
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permissions -rw-r--r--
Revision: 201007 Kit: 201011
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/*
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* Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:   
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*
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*/
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#include "glxdatasource.h"
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#include <glxsingletonstore.h>
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#include <glxpanic.h>
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#include <glxtracer.h>
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#include "glxdatasourcetask.h"
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#include "mglxdatasourceupdateobserver.h"
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#include "mglxdatasourcerequestobserver.h"
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// ---------------------------------------------------------------------------
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// CDataSourceArrayOwner::InstanceL
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// ---------------------------------------------------------------------------
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//
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CDataSourceArrayOwner* CDataSourceArrayOwner::InstanceL() 
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	{
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    TRACER("CDataSourceArrayOwner::InstanceL()");
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    return CGlxSingletonStore::InstanceL(&NewL);
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    }
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// ---------------------------------------------------------------------------
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// CDataSourceArrayOwner::Close
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// ---------------------------------------------------------------------------
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//
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void CDataSourceArrayOwner::Close() 
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   {
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    TRACER("void CDataSourceArrayOwner::Close()");
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   CGlxSingletonStore::Close(this);
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   }
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// ---------------------------------------------------------------------------
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// CDataSourceArrayOwner::Array
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// ---------------------------------------------------------------------------
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//
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RPointerArray<CGlxDataSource>& CDataSourceArrayOwner::Array()
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	{
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    TRACER("CDataSourceArrayOwner::Array()");
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    return iDataSources;
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	}
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// ---------------------------------------------------------------------------
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// CDataSourceArrayOwner::NewL
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// ---------------------------------------------------------------------------
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//
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CDataSourceArrayOwner* CDataSourceArrayOwner::NewL() 
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   {
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    TRACER("CDataSourceArrayOwner* CDataSourceArrayOwner::NewL()");
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   return new (ELeave) CDataSourceArrayOwner();
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   }
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// ---------------------------------------------------------------------------
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// CDataSourceArrayOwner::~CDataSourceArrayOwner
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// ---------------------------------------------------------------------------
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//
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CDataSourceArrayOwner::~CDataSourceArrayOwner()
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   {
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    TRACER("CDataSourceArrayOwner::~CDataSourceArrayOwner()");
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   iDataSources.Close();
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   }    
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// ---------------------------------------------------------------------------
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// Constructor
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// ---------------------------------------------------------------------------
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//
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EXPORT_C CGlxDataSource::CGlxDataSource()
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    : CActive(EPriorityStandard)
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    {
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    TRACER("EXPORT_C CGlxDataSource::CGlxDataSource()");
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    CActiveScheduler::Add(this);
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    }
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// ---------------------------------------------------------------------------
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// MGlxDataSource::OpenDataSourceL
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// ---------------------------------------------------------------------------
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//
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EXPORT_C MGlxDataSource* MGlxDataSource::OpenDataSourceL(const TUid& aDataSource, MGlxDataSourceUpdateObserver& aObserver)
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	{
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    TRACER("MGlxDataSource* MGlxDataSource::OpenDataSourceL()");
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	CDataSourceArrayOwner* dsArrayOwner = CDataSourceArrayOwner::InstanceL();
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	CleanupClosePushL(*dsArrayOwner);
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	RPointerArray<CGlxDataSource>& dataSoruceArray = dsArrayOwner->Array();
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	CGlxDataSource* dataSource = NULL;
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	if (dataSoruceArray.Count())
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		{
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		for (TInt i = 0;i < dataSoruceArray.Count(); i++)
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			{
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			if (dataSoruceArray[i]->Uid() == aDataSource)
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				{
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				dataSource = dataSoruceArray[i];
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				dataSource->AddObserverL(aObserver);
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				break;
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				}
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			}
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		}
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	if (!dataSource)
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		{
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		REComSession ecomSession = REComSession::OpenL();
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		CleanupClosePushL(ecomSession);
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		TUid dtorKey;
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		dataSource = reinterpret_cast<CGlxDataSource*>(
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           REComSession::CreateImplementationL(aDataSource, dtorKey));
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        CleanupStack::PushL(dataSource);
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        dataSoruceArray.AppendL(dataSource);
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        dataSource->SetUid(aDataSource);
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        dataSource->SetDtorKey(dtorKey);
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        dataSource->AddObserverL(aObserver);
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        CleanupStack::Pop(dataSource);
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        dataSource->SetEComSession(ecomSession);
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        CleanupStack::Pop(&ecomSession);
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        dataSource->SetDataSourceArrayOwner(dsArrayOwner);
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        CleanupStack::Pop(dsArrayOwner);
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		}
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	else
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		{
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		CleanupStack::PopAndDestroy(dsArrayOwner);
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		}
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   138
	
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    return dataSource;
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	}
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// ---------------------------------------------------------------------------
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// CGlxDataSource::Close
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// ---------------------------------------------------------------------------
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//
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EXPORT_C void CGlxDataSource::Close(MGlxDataSourceUpdateObserver& aObserver)
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	{
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    TRACER("void CGlxDataSource::Close(MGlxDataSourceUpdateObserver& aObserver)");
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	TInt observer = iDataSourceObservers.Find(&aObserver);
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	__ASSERT_DEBUG(observer !=KErrNotFound, Panic(EGlxPanicLogicError)); // Closing non-existant observer
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	iDataSourceObservers.Remove(observer);
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	if (iDataSourceObservers.Count() == 0)
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		{
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		RPointerArray<CGlxDataSource>& dataSourceArray = iDataSourceArrayOwner->Array();
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		TInt dataSource = dataSourceArray.Find(this);
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		__ASSERT_DEBUG(dataSource !=KErrNotFound, Panic(EGlxPanicLogicError)); // Closing non-existant observer
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		dataSourceArray.Remove(dataSource);
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		REComSession ecomSession = iEComSession;
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		TInt count = dataSourceArray.Count();
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		delete this;
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		if (count == 0)
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			{
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			ecomSession.Close();
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			}
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		}	
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	}
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   167
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// ---------------------------------------------------------------------------
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// CGlxDataSource::~CGlxDataSource
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// ---------------------------------------------------------------------------
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   171
//
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EXPORT_C CGlxDataSource::~CGlxDataSource()
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	{
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   174
    TRACER("EXPORT_C CGlxDataSource::~CGlxDataSource()");
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    Cancel();
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   176
	iDataSourceObservers.Close();
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   177
    REComSession::DestroyedImplementation(iDtorKey);
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    iTasks.ResetAndDestroy();
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	iDataSourceArrayOwner->Close();
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	}
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   181
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// ---------------------------------------------------------------------------
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   183
// CGlxDataSource::AddObserverL
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// ---------------------------------------------------------------------------
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   185
//
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   186
void CGlxDataSource::AddObserverL(MGlxDataSourceUpdateObserver& aObserver)
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	{
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   188
    TRACER("void CGlxDataSource::AddObserverL(MGlxDataSourceUpdateObserver& aObserver)");
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   189
	iDataSourceObservers.AppendL(&aObserver);
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   190
	}
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   191
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   192
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   193
// ---------------------------------------------------------------------------
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   194
// CGlxDataSource::RunL
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   195
// ---------------------------------------------------------------------------
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   196
//
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   197
EXPORT_C void CGlxDataSource::RunL()
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   198
    {
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   199
    TRACER("void CGlxDataSource::RunL()");
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    TAction action = static_cast<TAction>(iStatus.Int());
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   201
    
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   202
    switch (action)
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   203
        {
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   204
        case ECleanupAndExecute:
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   205
            {
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   206
            delete iTasks[0];
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   207
            iTasks.Remove(0);
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   208
            TaskCompletedL();
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   209
            }
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   210
        // Don't break - fall through 
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   211
        case EExecuteOnly:
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   212
            {
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   213
            if ( (iTasks.Count() > 0) && ( iDataSourceReady || !iTasks[0]->IsDataSourceNeeded() ) )
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   214
                {
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   215
                TaskStartedL();
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   216
                iTasks[0]->ExecuteRequestL(); // Execute the oldest request
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   217
                }
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   218
            }
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        break;
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   220
        }
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   221
    }
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   222
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// ---------------------------------------------------------------------------
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// CGlxDataSource::DoCancel
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// ---------------------------------------------------------------------------
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//
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EXPORT_C void CGlxDataSource::DoCancel()
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   228
    {
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    TRACER("void CGlxDataSource::DoCancel()");
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    // CActive::Cancel() will wait for the request to complete.
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    // It is not necessary to take any action here.
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    }
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// ---------------------------------------------------------------------------
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// CGlxDataSource::RunError
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// ---------------------------------------------------------------------------
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//
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EXPORT_C TInt CGlxDataSource::RunError(TInt aError)
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    {
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    TRACER("TInt CGlxDataSource::RunError(TInt aError)");
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    __ASSERT_DEBUG(iTasks.Count() > 0, Panic(EGlxPanicLogicError));
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    iTasks[0]->HandleRequestComplete(aError);
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    return KErrNone;
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    }
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// ---------------------------------------------------------------------------
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// CGlxDataSource::CompleteSelf
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// ---------------------------------------------------------------------------
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//
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void CGlxDataSource::CompleteSelf(TAction aAction)
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    {
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    TRACER("void CGlxDataSource::CompleteSelf(TAction aAction)");
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    TRequestStatus* status=&iStatus;
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    User::RequestComplete(status, aAction);
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    SetActive();    
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    }
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// ---------------------------------------------------------------------------
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// CGlxDataSource::DataSourceRequestL
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// ---------------------------------------------------------------------------
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//
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EXPORT_C void CGlxDataSource::DataSourceRequestL(CGlxRequest* aRequest, MGlxDataSourceRequestObserver& aObserver)
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	{
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    TRACER("void CGlxDataSource::DataSourceRequestL()");
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	CGlxDataSourceTask* newRequest = CreateTaskL(aRequest, aObserver);
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	iTasks.AppendL(newRequest);
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	TryStartTask();
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	}
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// ---------------------------------------------------------------------------
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// CGlxDataSource::TryStartTask
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// ---------------------------------------------------------------------------
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//
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EXPORT_C void CGlxDataSource::TryStartTask(TBool aFirstStart)
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	{
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    TRACER("void CGlxDataSource::TryStartTask(TBool aFirstStart)");
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	if ( ( aFirstStart ? iTasks.Count() >= 1 : iTasks.Count() == 1 ) && !IsActive() )
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    // There is one request i.e. it was just added by the call to AppendL() above and we are not waiting 
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    // for a an existing request to complete. If we are waiting for a request to complete then the request 
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    // we have just added will run later.
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		{
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        CompleteSelf(EExecuteOnly);
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		}
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	}
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// ---------------------------------------------------------------------------
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// CGlxDataSource::HandleTaskComplete
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// ---------------------------------------------------------------------------
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//
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EXPORT_C void CGlxDataSource::HandleTaskComplete(CGlxDataSourceTask* aRequest)
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	{
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    TRACER("void CGlxDataSource::HandleTaskComplete(CGlxDataSourceTask* aRequest)");
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	__ASSERT_DEBUG(iTasks.Find(aRequest) == 0, Panic( EGlxPanicLogicError )); // The only request that should be executing is the 0th request in the array.
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    CompleteSelf(ECleanupAndExecute);
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	}
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   297
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// ---------------------------------------------------------------------------
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// CGlxDataSource::CancelRequest
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// ---------------------------------------------------------------------------
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//
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   302
EXPORT_C void CGlxDataSource::CancelRequest(MGlxDataSourceRequestObserver& aObserver)
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	{
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    TRACER("void CGlxDataSource::CancelRequest(MGlxDataSourceRequestObserver& aObserver)");    
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    for (TInt i = 0; i < iTasks.Count(); i++)
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		{
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		if (iTasks[i]->ObserverMatch(aObserver))
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			{            
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   309
            if (i == 0) // Cancel the active request
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                {
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   311
                if (!IsActive())
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                    {
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                    // We can only cancel the request if it is currently executing. The active object being
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                    // active indicates that the request has not yet started or has already completed.
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                    iTasks[0]->CancelRequest();
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   316
                    }
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                Cancel();
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                CompleteSelf(ECleanupAndExecute);
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   319
                }
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   320
            else // The request is waiting to be executed - just remove it from the queue.
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   321
                {
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                delete iTasks[i];
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                iTasks.Remove(i);
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   324
                }
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            break;
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   326
			}
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		}
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   328
	}
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   329
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   330
// ---------------------------------------------------------------------------
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// CGlxDataSource::BroadcastMessage
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// ---------------------------------------------------------------------------
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   333
//
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   334
EXPORT_C void CGlxDataSource::BroadcastMessage(CMPXMessage& aMessage)
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   335
	{
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   336
    TRACER("void CGlxDataSource::BroadcastMessage(CMPXMessage& aMessage)");
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	__ASSERT_DEBUG(iDataSourceObservers.Count(), Panic(EGlxPanicLogicError));
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	// There should always be at least 1 observer because they are passed in
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	// when the object is instatiated.
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	iDataSourceObservers[0]->HandleMessage(aMessage);
74c9f037fd5d Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   341
	}