bluetoothengine/bthid/bthidserver/src/socketwriter.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 18 Jan 2010 20:28:57 +0200
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permissions -rw-r--r--
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/*
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* Copyright (c) 2008 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:  This is the implementation of application class
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 *
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*/
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#include "sockets.pan"
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#include "socketwriter.h"
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#include "socketobserver.h"
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#include "timeouttimer.h"
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// ----------------------------------------------------------------------
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// Initial size of the buffers for data to write
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const TInt KWriteBufferInitialSize = 20;
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// 5 seconds socket write time-out
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const TInt CSocketWriter::KTimeOut = 5000000;
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CSocketWriter* CSocketWriter::NewL(TUint aSocketID,
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        MSocketObserver& aObserver)
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    {
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    CSocketWriter* self = CSocketWriter::NewLC(aSocketID, aObserver);
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    CleanupStack::Pop(self);
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    return self;
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    }
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CSocketWriter* CSocketWriter::NewLC(TUint aSocketID,
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        MSocketObserver& aObserver)
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    {
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    CSocketWriter* self = new (ELeave) CSocketWriter(aSocketID, aObserver);
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    CleanupStack::PushL(self);
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    self->ConstructL();
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    return self;
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    }
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CSocketWriter::CSocketWriter(TUint aSocketID, MSocketObserver& aObserver) :
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    CActive(EPriorityStandard), iSocketID(aSocketID), iObserver(aObserver)
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    {
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    }
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CSocketWriter::~CSocketWriter()
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    {
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    Cancel();
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    delete iTimer;
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    delete iWriteBuffer[0];
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    delete iWriteBuffer[1];
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    }
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void CSocketWriter::DoCancel()
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    {
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    // Cancel asynchronous write request
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    iSocket->CancelWrite();
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    iTimer->Cancel();
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    // Clear the buffers
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    *iWriteBuffer[0] = KNullDesC8;
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    *iWriteBuffer[1] = KNullDesC8;
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    }
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void CSocketWriter::ConstructL()
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    {
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    CActiveScheduler::Add(this);
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    iTimer = CTimeOutTimer::NewL(CActive::EPriorityStandard, *this);
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    iWriteBuffer[0] = HBufC8::NewL(KWriteBufferInitialSize);
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    iWriteBuffer[1] = HBufC8::NewL(KWriteBufferInitialSize);
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    iCurrentBuffer = 0;
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    }
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void CSocketWriter::TimerExpired()
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    {
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    Cancel();
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    // Clear the buffers
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    *iWriteBuffer[0] = KNullDesC8;
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    *iWriteBuffer[1] = KNullDesC8;
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    iObserver.HandleSocketError(iSocketID, EFalse, KErrTimedOut);
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    }
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void CSocketWriter::RunL()
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    {
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    iTimer->Cancel();
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    // Remember the current status
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    TInt status = iStatus.Int();
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    // Clear the buffer that has been written
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    *iWriteBuffer[iCurrentBuffer] = KNullDesC8;
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    // If the other buffer has data, write it now
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    if (iWriteBuffer[1 - iCurrentBuffer]->Length() > 0)
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        {
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        iCurrentBuffer = 1 - iCurrentBuffer;
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        DoWrite();
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        }
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    // Handle status of completed write
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    if (KErrNone == status)
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        {
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        iObserver.HandleWriteComplete(iSocketID);
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        }
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    else
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        {
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        // Error: pass it up to user interface
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        iObserver.HandleSocketError(iSocketID, EFalse, status);
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        }
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    }
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void CSocketWriter::Initialise(RSocket* aSocket)
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    {
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    __ASSERT_ALWAYS(!IsActive(),
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            User::Panic(KPanicSocketsEngineWrite, ESocketsBadState));
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    iSocket = aSocket;
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    }
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void CSocketWriter::IssueWriteL(const TDesC8& aData)
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    {
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    if (IsActive())
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        {
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        // Put the data in the other buffer
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        StoreDataL(aData, 1 - iCurrentBuffer);
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        }
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    else
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        {
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        // Put the data in the current buffer and write immediately
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        StoreDataL(aData, iCurrentBuffer);
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        DoWrite();
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        }
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    }
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void CSocketWriter::DoWrite()
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    {
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    // If we aren't in the correct state for a write, panic.
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    __ASSERT_ALWAYS(!IsActive(),
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            User::Panic(KPanicSocketsEngineWrite, ESocketsBadState));
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    // Initiate actual write
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    iSocket->Write(*iWriteBuffer[iCurrentBuffer], iStatus);
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    // Request timeout
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    if (!iTimer->IsActive())
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        iTimer->After(KTimeOut);
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    SetActive();
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    }
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void CSocketWriter::StoreDataL(const TDesC8& aData, TInt aBuffer)
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    {
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    __ASSERT_ALWAYS(iWriteBuffer[aBuffer]->Length() == 0,
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            User::Panic(KPanicSocketsEngineWrite, ESocketsBadState));
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    // Reallocate the buffer if it's too small
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    if (aData.Length() > iWriteBuffer[aBuffer]->Des().MaxLength())
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        {
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        // Make sure we have a new buffer before deleting the old one
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        HBufC8* newBuffer = HBufC8::NewL(aData.Length());
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        delete iWriteBuffer[aBuffer];
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        iWriteBuffer[aBuffer] = newBuffer;
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        }
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    *iWriteBuffer[aBuffer] = aData;
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    }