// // This file is part of an OMNeT++/OMNEST simulation example. // // Copyright (C) 2003-2008 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 Txc6 : public cSimpleModule { private: cMessage *event; // pointer to the event object which we'll use for timing cMessage *tictocMsg; // variable to remember the message until we send it back public: Txc6(); virtual ~Txc6(); protected: virtual void initialize(); virtual void handleMessage(cMessage *msg); }; Define_Module(Txc6); Txc6::Txc6() { // Set the pointer to NULL, so that the destructor won't crash // even if initialize() doesn't get called because of a runtime // error or user cancellation during the startup process. event = tictocMsg = NULL; } Txc6::~Txc6() { // Dispose of dynamically allocated the objects cancelAndDelete(event); delete tictocMsg; } void Txc6::initialize() { // Create the event object we'll use for timing -- just any ordinary message. event = new cMessage("event"); // No tictoc message yet. tictocMsg = NULL; if (strcmp("tic", getName()) == 0) { // We don't start right away, but instead send an message to ourselves // (a "self-message") -- we'll do the first sending when it arrives // back to us, at t=5.0s simulated time. EV << "Scheduling first send to t=5.0s\n"; tictocMsg = new cMessage("tictocMsg"); scheduleAt(5.0, event); } } void Txc6::handleMessage(cMessage *msg) { // There are several ways of distinguishing messages, for example by message // kind (an int attribute of cMessage) or by class using dynamic_cast // (provided you subclass from cMessage). In this code we just check if we // recognize the pointer, which (if feasible) is the easiest and fastest // method. if (msg==event) { // The self-message arrived, so we can send out tictocMsg and NULL out // its pointer so that it doesn't confuse us later. EV << "Wait period is over, sending back message\n"; send(tictocMsg, "out"); tictocMsg = NULL; } else { // If the message we received is not our self-message, then it must // be the tic-toc message arriving from our partner. We remember its // pointer in the tictocMsg variable, then schedule our self-message // to come back to us in 1s simulated time. EV << "Message arrived, starting to wait 1 sec...\n"; tictocMsg = msg; scheduleAt(simTime()+1.0, event); } }