bluetoothcommsprofiles/btpan/bnep/CSocketWriter.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 25 May 2010 13:54:55 +0300
branchRCL_3
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parent 0 29b1cd4cb562
permissions -rw-r--r--
Revision: 201018 Kit: 2010121
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// Copyright (c) 2004-2009 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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 @file
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 @internalComponent
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*/
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#include <bluetooth/logger.h>
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#include "CBnepLink.h"
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#include "CSocketWriter.h"
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#include "bneputils.h"
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#ifdef __FLOG_ACTIVE
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_LIT8(KLogComponent, LOG_COMPONENT_PAN_BNEP);
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#endif
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CSocketWriter::CSocketWriter (RInternalSocket& aSocket, CBnepLink& aOwner)
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        : CActive(EPriorityHigh), iSocket(aSocket), iBnepLink(aOwner)
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    {
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    LOG_FUNC
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    CActiveScheduler::Add(this); 
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    }
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/**
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   Cancels any pending writes.
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   @internalComponent
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*/
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CSocketWriter::~CSocketWriter()
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    {
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    LOG_FUNC
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    Cancel();
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    iPendingWriteData.Free();
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    }
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/**
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   Create the socket writer
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   @internalComponent
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*/ 
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CSocketWriter* CSocketWriter::NewL (RInternalSocket& aSocket, CBnepLink& aOwner)
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    {
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    LOG_STATIC_FUNC
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    CSocketWriter* self = new(ELeave) CSocketWriter(aSocket, aOwner);
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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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/**
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   Attempt to write a buffer.
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   @return KErrNone if successful or a system-wide error code
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   @internalComponent
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*/
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TInt CSocketWriter::Write (RMBufChain& aChain)
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    {
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    LOG_FUNC
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    if (aChain.Length() > KBnepMTU)
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        {
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        LOG(_L8("Length greater than expected MTU!"));
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        aChain.Free();
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        return KErrTooBig;
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        }
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    if (IsActive())
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        {
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        if(iQueueSize < KMaxSocketWriterQueueSize)
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            {
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            iQueue.Append(aChain);
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            iQueueSize++;
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            return KErrNone;
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            }
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        else
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            {
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            LOG(_L8("Bnep::ESocketWriterQueueOverflow"));
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            aChain.Free();
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            return KErrOverflow;
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            }
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        }
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    LOG1(_L8("Length %d"), aChain.Length());
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    __ASSERT_DEBUG(iPendingWriteData.IsEmpty(), BnepUtils::Panic(Bnep::ESocketWriterQueueOverflow));
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    iPendingWriteData.Assign(aChain);
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    iSocket.Write(iPendingWriteData, iStatus);
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    SetActive();
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    return KErrNone; 
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    }
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/**
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   Does nothing
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   @internalComponent
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*/ 
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void CSocketWriter::ConstructL ()
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    {
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    LOG_FUNC
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    }
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/**
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   Checks iQueue for outstanding buffers and writes the first
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   if it exists.
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   @internalComponent
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*/ 
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void CSocketWriter::RunL ()
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    {
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    LOG_FUNC
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	// Check if the completed write was a success.
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	if(iStatus.Int() != KErrNone)
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		{
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		// The write failed - clear the pending write data.
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	    LOG1(_L8("CSocketWriter::RunL completed with error: %d"), iStatus.Int());
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		iPendingWriteData.Free();
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		}
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    __ASSERT_DEBUG(iPendingWriteData.IsEmpty(), BnepUtils::Panic(Bnep::ESocketWriterQueueOverflow));
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    if(!iQueue.IsEmpty())
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        {
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        RMBufChain item;
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        //Check on return value of iQueue.Remove() is unnecessary, since we've checked iQueue.IsEmpty()
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        static_cast<void>(iQueue.Remove(item));
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        iQueueSize--;
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        Write(item);
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        }
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    else
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        {
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        iQueueSize = 0; // To make sure that we are always in sync
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        }
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    }
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/**
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   Cancel write.
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   @internalComponent
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*/
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void CSocketWriter::DoCancel ()
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    {
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    LOG_FUNC
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    iSocket.CancelWrite();
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    // Free the pending data buffer to aviod asserting when the next Write operation
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    // is performed.
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    iPendingWriteData.Free();
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    }