TCPSendQueue.h

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//
// Copyright (C) 2004 Andras Varga
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program; if not, see <http://www.gnu.org/licenses/>.
//

#ifndef __INET_TCPSENDQUEUE_H
#define __INET_TCPSENDQUEUE_H

#include <omnetpp.h>
#include "TCPConnection.h"
#include "TCPSegment.h"


class INET_API TCPSendQueue : public cPolymorphic
{
  protected:
    TCPConnection *conn; // the connection that owns this queue

  public:
    TCPSendQueue()  {conn=NULL;}

    virtual ~TCPSendQueue() {}

    virtual void setConnection(TCPConnection *_conn)  {conn = _conn;}

    virtual void init(uint32 startSeq) = 0;

    virtual void enqueueAppData(cPacket *msg) = 0;

    virtual uint32 getBufferStartSeq() = 0;

    virtual uint32 getBufferEndSeq() = 0;

    inline ulong getBytesAvailable(uint32 fromSeq)
    {
        uint32 bufEndSeq = getBufferEndSeq();
        return seqLess(fromSeq, bufEndSeq) ? bufEndSeq-fromSeq : 0;
    }

    virtual TCPSegment *createSegmentWithBytes(uint32 fromSeq, ulong maxNumBytes) = 0;

    virtual void discardUpTo(uint32 seqNum) = 0;

};

#endif