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CongestionControlStrategy.hpp

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 * This file is part of openWNS (open Wireless Network Simulator)
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 * Copyright (C) 2004-2007
 * Chair of Communication Networks (ComNets)
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 * openWNS is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License version 2 as published by the
 * Free Software Foundation;
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 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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#ifndef TCP_CONGESTIONCONTROLSTRATEGY_HPP
#define TCP_CONGESTIONCONTROLSTRATEGY_HPP


#include <WNS/StaticFactory.hpp>
#include <WNS/PyConfigViewCreator.hpp>

namespace tcp { 

    namespace tests {
        class CongestionControlTest;
        class CumulativeACKTest;
    } // namespace tests

    class CongestionControlStrategy
    {   
        friend class CongestionControl;
        friend class tests::CongestionControlTest;
        friend class tests::CumulativeACKTest;

    public:
        enum segmentLoss {TIMEOUT, DUPLICATE_ACK};

        virtual
        ~CongestionControlStrategy() {}

        virtual void
        onSegmentLoss(segmentLoss _sl, unsigned long int _ackNR) = 0;

        virtual void
        onRTTSample() = 0;

        virtual unsigned long int
        getWindowSize() = 0;

        virtual simTimeType
        getRetransmissionTimeout() = 0;

        virtual void
        onSegmentAcknowledged() = 0;

        virtual bool
        duplicateACKThresholdReached(unsigned long int _ackNR) = 0;

        virtual void
        clearDuplicateACKCounter() = 0;

    protected:
        virtual void
        setWindowSize(unsigned long int new_cwnd) = 0;

        enum Mode {SLOWSTART, CONGESTION_AVOIDANCE};
    };

    typedef CongestionControlStrategy SlowStartStrategy;
    typedef CongestionControlStrategy CongestionAvoidanceStrategy;

    typedef wns::PyConfigViewCreator<SlowStartStrategy> SlowStartCreator;
    typedef wns::StaticFactory<SlowStartCreator> SlowStartFactory;

    typedef wns::PyConfigViewCreator<CongestionAvoidanceStrategy> CongestionAvoidanceCreator;
    typedef wns::StaticFactory<CongestionAvoidanceCreator> CongestionAvoidanceFactory;

} // namespace tcp

#endif // NOT defined TCP_CONGESTIONCONTROLSTRATEGY_HPP

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