/*

* 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 the License "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:

*

*

*/

#ifndef CUSBPNISASENDER_H

#define CUSBPNISASENDER_H

//  INCLUDES

#include "musbpncontrolobserver.h"

#include <e32base.h>    // For CActive

// CONSTANTS

// MACROS

// DATA TYPES

// FUNCTION PROTOTYPES

// FORWARD DECLARATIONS

class MUsbPnBufferListener;

class CUsbPnPacket;

class RIscApi;

// CLASS DECLARATION

/**

*  Data sender to ISA direction.

*/

class CUsbPnIsaSender : public CActive, public MUsbPnControlObserver

    {

    public:  // Constructors and destructor

        /**

        * Two-phased constructor.

        */

        static CUsbPnIsaSender* NewL( MUsbPnBufferListener&, RIscApi& );

        /**

        * Destructor.

        */

        ~CUsbPnIsaSender();

    public: // Functions from base classes

        /**

        * From MUsbPnControlObserver. Returns usable circular packet if any.

        * @return CUsbPnPacket&. Packet for receiver.

        */

        CUsbPnPacket& PacketL();

        /**

        * From MUsbPnControlObserver. Adds packet to send queue.

        */

        void Send( CUsbPnPacket& aPacket );

    protected:  // Functions from base classes

        /**

        * From CActive

        */

        void DoCancel( );

        /**

        * From CActive

        */

        void RunL( );

        /**

        * From CActive

        */

        TInt RunError( TInt );

    private:

        /**

        * C++ default constructor.

        */

        CUsbPnIsaSender( MUsbPnBufferListener&, RIscApi& );

        /**

        * By default Symbian 2nd phase constructor is private.

        */

        void ConstructL();

        /**

        * Creates packet object.

        */

        void AddPacketBufferL( TInt );

        /**

        * Sends packet if it is next in line and not already sending.

        */

        void TryToSendPacket( CUsbPnPacket& );

    private:    // Data

        // Reference to receiver for continuing receive

        MUsbPnBufferListener&   iBufferListener;

        // Reference to ISCAPI handle

        RIscApi&                iIscApi;

        // Number of packets in queue

        TUint                   iPacketCount;

        // Ownership. Newest packet -marker of circular buffer. Packets added to this 'end' of pool.

        CUsbPnPacket*           iPacket;

        // Pointer to oldest packet -marker of circular buffer. Packets written from this 'end' of pool.

        CUsbPnPacket*           iCurrentPacket;

    };

#endif      // CUSBPNISASENDER_H

// End of File