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# txc7.cc

    //
    // This file is part of an OMNeT++/OMNEST simulation example.
    //
    // Copyright (C) 2003-2005 Andras Varga
    //
    // This file is distributed WITHOUT ANY WARRANTY. See the file
    // `license' for details on this and other legal matters.
    //

    #include <stdio.h>
    #include <string.h>
    #include <omnetpp.h>

    class Tic7 : public cSimpleModule
    {
      private:
        double timeout;  // timeout
        cMessage *timeoutEvent;  // holds pointer to the timeout self-message

      public:
        Tic7();
        virtual ~Tic7();

      protected:
        virtual void initialize();
        virtual void handleMessage(cMessage *msg);
    };

    Define_Module(Tic7);

    Tic7::Tic7()
    {
        timeoutEvent = NULL;
    }

    Tic7::~Tic7()
    {
        cancelAndDelete(timeoutEvent);
    }

    void Tic7::initialize()
    {
        // Initialize variables.
        timeout = 1.0;
        timeoutEvent = new cMessage("timeoutEvent");

        // Generate and send initial message.
        ev << "Sending initial message\n";
        cMessage *msg = new cMessage("tictocMsg");
        send(msg, "out");
        scheduleAt(simTime()+timeout, timeoutEvent);
    }

    void Tic7::handleMessage(cMessage *msg)
    {
        if (msg==timeoutEvent)
        {
            // If we receive the timeout event, that means the packet hasn't
            // arrived in time and we have to re-send it.
            ev << "Timeout expired, resending message and restarting timer\n";
            cMessage *msg = new cMessage("tictocMsg");
            send(msg, "out");
            scheduleAt(simTime()+timeout, timeoutEvent);
        }
        else // message arrived
        {
            // Acknowledgement received -- delete the stored message and cancel
            // the timeout event.
            ev << "Timer cancelled.\n";
            cancelEvent(timeoutEvent);

            // Ready to send another one.
            cMessage *msg = new cMessage("tictocMsg");
            send(msg, "out");
            scheduleAt(simTime()+timeout, timeoutEvent);
        }
    }

    class Toc7 : public cSimpleModule
    {
      protected:
        virtual void handleMessage(cMessage *msg);
    };

    Define_Module(Toc7);

    void Toc7::handleMessage(cMessage *msg)
    {
        if (uniform(0,1) < 0.1)
        {
            ev << "\"Losing\" message.\n";
            bubble("message lost");  // making animation more informative...
            delete msg;
        }
        else
        {
            ev << "Sending back same message as acknowledgement.\n";
            send(msg, "out");
        }
    }