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Bridge.hpp

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 * This file is part of openWNS (open Wireless Network Simulator)
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 * 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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 *
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#ifndef WNS_LDK_TOOLS_BRIDGE_HPP
#define WNS_LDK_TOOLS_BRIDGE_HPP

#include <WNS/ldk/CommandTypeSpecifier.hpp>
#include <WNS/ldk/HasReceptor.hpp>
#include <WNS/ldk/HasConnector.hpp>
#include <WNS/ldk/HasDeliverer.hpp>

namespace wns { namespace ldk { namespace tools {

    namespace bridge
    {
        class Forwarder :
            public virtual FunctionalUnit,
            public wns::ldk::CommandTypeSpecifier<>,
            public wns::ldk::HasReceptor<>,
            public wns::ldk::HasConnector<>,
            public wns::ldk::HasDeliverer<>,
            public Cloneable<Forwarder>
        {
        public:
            Forwarder(fun::FUN* fuNet, double _loss = 0.0) :
                    wns::ldk::CommandTypeSpecifier<>(fuNet),
                    wns::ldk::HasReceptor<>(),
                    wns::ldk::HasConnector<>(),
                    wns::ldk::HasDeliverer<>(),
                    Cloneable<Forwarder>(),

                    other(NULL),
                    loss(_loss)
            {}

            void
            link(Forwarder* _other)
            {
                other = _other;
            }

            virtual void
            doOnData(const wns::ldk::CompoundPtr& compound)
            {
                if((rand() / (RAND_MAX + 1.0)) < loss) {
                    return;
                }

                // there must always be an accepting lower functionalUnit.
                // no buffering here.
                other->getConnector()->getAcceptor(compound)->sendData(compound);
            } // doOnData


            virtual void
            doSendData(const wns::ldk::CompoundPtr& compound)
            {
                if((rand() / (RAND_MAX + 1.0)) < loss) {
                    return;
                }

                other->getDeliverer()->getAcceptor(compound)->onData(compound);
            } // doSendData

            void
            setLoss(double _loss)
            {
                assure(_loss >= 0.0 && _loss <= 1.0, "Invalid loss value.");

                loss = _loss;
            }

        private:
            virtual bool
            doIsAccepting(const wns::ldk::CompoundPtr& /* compound */ ) const
            {
                return true;
            }

            virtual void
            doWakeup()
            {}

            FunctionalUnit* other;
            double loss;
        };
    }


    class Bridge
    {
    public:
        Bridge(fun::FUN* leftFUN, fun::FUN* rightFUN, double loss = 0.0);
        virtual ~Bridge();

        bridge::Forwarder* getLeft() const
            {
                return a;
            }

        bridge::Forwarder* getRight() const
            {
                return b;
            }

        void setLoss(double loss)
            {
                a->setLoss(loss);
                b->setLoss(loss);
            }

    private:
        bridge::Forwarder *a;
        bridge::Forwarder *b;
    };

}}}


#endif // NOT defined WNS_LDK_TOOLS_BRIDGE_HPP

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