/*

* Copyright (c) 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:  Writes to socket.

*

*/

#ifndef __SOCKETSWRITER_H__

#define __SOCKETSWRITER_H__

// INCLUDES

#include <in_sock.h>

#include "TimeOutNotifier.h"

// FORWARD DECLARATIONS

class CTimeOutTimer;

class MSocketObserver;

const TInt KSocketWriteBufferSize = 1024;

const TInt KTransferBufferSize = 8 * 1024;

// CLASS DECLARATION

class CSocketsWriter : public CActive, public MTimeOutNotifier

    {

    public:

        static CSocketsWriter* NewL( MSocketObserver& aEngineNotifier,

                                     RSocket& aSocket );

        virtual ~CSocketsWriter();

        /**

         * Add data to iTransferBuffer and start sending if not already sending

         * Leaves with KErrOverflow, if there is not enough free space.

         * This can be called as long as there is space in buffer.

         */

        void SendL(const TDesC8& aData);

        void CancelSending();

        /**

        * Return number of bytes that can be added to iTransferBuffer.

        */

        TInt FreeSpaceInSendBuffer();

        TInt SendBufferMaxSize();

    protected: // from CActive

        void DoCancel();

        void RunL();

    protected: // from MTimeOutNotifier

        void TimerExpired();

    private: // Constructors and destructors

        CSocketsWriter( MSocketObserver& aEngineNotifier, RSocket& aSocket );

        void ConstructL();

    private: // New functions

        void SendNextPacket();

    private: // Enumerations

        enum TWriteState

            {

            ESending,

            EIdle // nothing to be sent

            };

    private: // Data

        RSocket& iSocket;

        MSocketObserver& iObserver;

        TBuf8<KTransferBufferSize> iTransferBuffer;

        TBuf8<KSocketWriteBufferSize> iWriteBuffer;

        CTimeOutTimer* iTimer;

        TInt iTimeOut; // microseconds

        TWriteState iWriteStatus;

    };

#endif // __SOCKETSWRITER_H__

// End of File