applayerpluginsandutils/httpprotocolplugins/httpclient/chttprequestbatcher.cpp
author hgs
Mon, 04 Oct 2010 15:35:43 +0530
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permissions -rw-r--r--
201039_01
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// Copyright (c) 2003-2009 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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#include <x509cert.h>
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#include "chttprequestbatcher.h"
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const TInt KBatchingTimeoutMicroSeconds = 100000;
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CHttpRequestBatcher* CHttpRequestBatcher::NewL(MOutputStream& aOutputStream, const TInt aBufferSize)
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	{
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	CHttpRequestBatcher* self = new (ELeave) CHttpRequestBatcher(aOutputStream, aBufferSize);
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	CleanupStack::PushL(self);
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	self->ConstructL();
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	CleanupStack::Pop(self);
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	return self;
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	}
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CHttpRequestBatcher::CHttpRequestBatcher(MOutputStream& aOutputStream, const TInt aBufferSize)
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: CActive(CActive::EPriorityStandard + 1), iDataToSend(TPtr8(NULL, 0)), iExcessData(TPtrC8(NULL, 0)), iMaxBufferSize(aBufferSize)
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	{
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	__FLOG_OPEN("http", "httpclienthandler.txt");
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	CActiveScheduler::Add(this);
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	iOutputStream = &aOutputStream;
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	iOutputStream->Bind(*this);
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	iFuncPtr = &CHttpRequestBatcher::SendRequestImmediatelyL;
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	}
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void CHttpRequestBatcher::ConstructL()
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	{
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	iBuffer = HBufC8::NewL(iMaxBufferSize);
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	iDataToSend.Set(iBuffer->Des());
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	iTimer.CreateLocal();
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	iTimerCompleted = EFalse;
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	}
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CHttpRequestBatcher::~CHttpRequestBatcher()
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	{
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	Cancel();
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	delete iBuffer;
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	iTimer.Close();
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	__FLOG_CLOSE;
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	}
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void CHttpRequestBatcher::SendRequestImmediatelyL(const TDesC8& aBuffer)
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	{
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#if defined (_DEBUG) && defined (_LOGGING)
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		__FLOG_0(_T8("!! Send the first request i.e. not batching"));
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#endif
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	iOutputStream->SendDataReqL(aBuffer);
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	}
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void CHttpRequestBatcher::SendRequestsBatchedL(const TDesC8& aBuffer)
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	{
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	StartTimer();
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	BatchRequestsL(aBuffer);
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	}
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void CHttpRequestBatcher::BatchRequestsL(const TDesC8& aBuffer)
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	{
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	if (iTimerCompleted)
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		iExcessData.Set(aBuffer);
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	else if ((aBuffer.Length() + iDataToSend.Length()) < iMaxBufferSize)
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		{
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		iDataToSend.Append(aBuffer);
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		// Buffer is not yet full, so request observer to send more data
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		iObserver->SendDataCnfL();
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		}
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	else
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		{
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		TInt pos = iMaxBufferSize - iDataToSend.Length();
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		// Fill up the buffer
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		iDataToSend.Append(aBuffer.Left(pos));
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		// Cancel the timer
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		Cancel();
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#if defined (_DEBUG) && defined (_LOGGING)
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		__FLOG_0(_T8("!! Buffer has been filled - cancel timer and send batched requests now"));
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#endif
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		// Send the request with a filled-up buffer
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		iOutputStream->SendDataReqL(iDataToSend);
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		// Save the excess data from this request
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		iExcessData.Set(aBuffer.Mid(pos));
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		}
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	}
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void CHttpRequestBatcher::StartTimer()
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	{
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	if(!IsActive())
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		{
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#if defined (_DEBUG) && defined (_LOGGING)
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		__FLOG_0(_T8("!! Start the batching timer"));
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#endif
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		SetActive();
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		iTimer.After(iStatus, KBatchingTimeoutMicroSeconds);
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		}
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	}
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/*
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 *	Methods from MOutputStream
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 */
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void CHttpRequestBatcher::Bind(MOutputStreamObserver& aObserver)
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	{
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	// Bind to the output stream observer
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	iObserver = &aObserver;
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	}
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void CHttpRequestBatcher::SendDataReqL(const TDesC8& aBuffer)
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	{
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	// Call the appropriate function depending on what the function pointer has been set to.
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	// For the first request, the pointer will be set to the SendRequestImmediately() function.
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	// For subsequent requests, i.e. when batching, the pointer will be set to the
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	// SendRequestsBatched() function.
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	(*this.*iFuncPtr)(aBuffer);
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	}
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void CHttpRequestBatcher::ShutdownReq()
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	{
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	iOutputStream->ShutdownReq();
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	}
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void CHttpRequestBatcher::SecureClientReq(const TDesC8& aHostName)
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	{
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	iOutputStream->SecureClientReq(aHostName);
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	}
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void CHttpRequestBatcher::Close()
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	{
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	iOutputStream->Close();
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	}
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const CX509Certificate* CHttpRequestBatcher::ServerCert()
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 	{
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	return iOutputStream->ServerCert();
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 	}
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TInt CHttpRequestBatcher::CipherSuite(TDes8& aCipherSuite)
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	{
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	return iOutputStream->CipherSuite(aCipherSuite);
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	}
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void CHttpRequestBatcher::MOutputStream_Reserved()
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	{
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	User::Invariant();
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	}
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void CHttpRequestBatcher::Reset ()
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	{
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	iOutputStream->Reset ();
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	}
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/*
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 *	Methods from MOutputStreamObserver
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 */
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void CHttpRequestBatcher::SendDataCnfL()
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	{
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	// If this is the first request send a confirmation to the observer that the data
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	// has been sent and then set the function pointer to the SendRequestBatched() method.
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	if (iFuncPtr == &CHttpRequestBatcher::SendRequestImmediatelyL)
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		{
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#if defined (_DEBUG) && defined (_LOGGING)
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		__FLOG_0(_T8("!! Received conf back for first request i.e. not batching"));
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#endif
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		iObserver->SendDataCnfL();
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		iFuncPtr = &CHttpRequestBatcher::SendRequestsBatchedL;
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		}
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	// If the timer did not complete then by implication a filled-up buffer was sent in the request.
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	else if (!iTimerCompleted)
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		{
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#if defined (_DEBUG) && defined (_LOGGING)
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		__FLOG_0(_T8("!! Received conf back for batched requests"));
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#endif
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		iDataToSend.Zero();
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		HandleExcessDataL();
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		}
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	else	// Timer did complete
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		{
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		iDataToSend.Zero();
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		// Check for any requests that may have been sent by the observer after the RunL fired
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		// i.e. the timer completed, but before we received a conf from the output stream.
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		if (iExcessData.Length() > 0)
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			HandleExcessDataL();
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		// Reset the flag
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		iTimerCompleted = EFalse;
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		}
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	}
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void CHttpRequestBatcher::HandleExcessDataL()
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	{
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	if (iExcessData.Length() > iMaxBufferSize)
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		{
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#if defined (_DEBUG) && defined (_LOGGING)
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		__FLOG_0(_T8("!! Handling excess data - have enough data to fill up another buffer so send it"));
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#endif
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		// It's possible that the excess data is larger than the maximum allowable size of the buffer in
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		// which case this excess data is used to fill up another buffer and a request made.
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		iDataToSend.Append(iExcessData.Left(iMaxBufferSize));
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		iOutputStream->SendDataReqL(iDataToSend);
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		iExcessData.Set(iExcessData.Mid(iMaxBufferSize));
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		}
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	else
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		{
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		// Not enough data to fill up a buffer therefore store the data
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		iDataToSend.Append(iExcessData);
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		iExcessData.Set(KNullDesC8());
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		iObserver->SendDataCnfL();
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#if defined (_DEBUG) && defined (_LOGGING)
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		__FLOG_0(_T8("!! Handling excess data - but not enough data to fill up buffer"));
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#endif
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		// start the timer again
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		StartTimer();			
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		}
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	}
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void CHttpRequestBatcher::SecureClientCnf()
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	{
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	iObserver->SecureClientCnf();
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	}
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void CHttpRequestBatcher::OutputStreamCloseInd(TInt aError)
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	{
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	Cancel();
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	iObserver->OutputStreamCloseInd(aError);
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	}
12
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TBool CHttpRequestBatcher::SecureRetry()
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     {
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         return iObserver->SecureRetry();
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     }
0
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void CHttpRequestBatcher::MOutputStreamObserver_Reserved()
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	{
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	User::Invariant();
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	}
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/*
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 * Methods from CActive
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 */
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void CHttpRequestBatcher::RunL()
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	{
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	if (iDataToSend.Length() > 0)
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		{
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#if defined (_DEBUG) && defined (_LOGGING)
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		__FLOG_0(_T8("!! Timer has completed before buffer has been filled - send request now"));
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#endif
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		// Timer has completed before the buffer has been filled, therefore send the request now.
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		iOutputStream->SendDataReqL(iDataToSend);
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		}
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	iTimerCompleted = ETrue;
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	}
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void CHttpRequestBatcher::DoCancel()
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	{
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	iTimer.Cancel();
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	}
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TInt CHttpRequestBatcher::RunError(TInt /*aError*/)
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	{
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	// The RunL() cannot leave - nothing to do here.
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	return KErrNone;
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	}
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void CHttpRequestBatcher::OnSendTimeOut()
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	{
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	iObserver->OnSendTimeOut();
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	}
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TInt CHttpRequestBatcher::SendTimeOutVal()
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	{
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	return iObserver->SendTimeOutVal();
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	}
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28
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void CHttpRequestBatcher::SetTCPCorking(TBool  aValue )
0
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    {
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    if (iOutputStream)
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            {
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            iOutputStream->SetTCPCorking(aValue);
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            }
0
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    }
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