Tic9 Class Reference

Inheritance diagram for Tic9:

List of all members.

Public Member Functions
	Tic9 ()
virtual	~Tic9 ()
Protected Member Functions
virtual cMessage *	generateNewMessage ()
virtual void	sendCopyOf (cMessage *msg)
virtual void	initialize ()
virtual void	handleMessage (cMessage *msg)
Private Attributes
simtime_t	timeout
cMessage *	timeoutEvent
int	seq
cMessage *	message

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Detailed Description

In the previous model we just created another packet if we needed to retransmit. This is OK because the packet didn't contain much, but in real life it's usually more practical to keep a copy of the original packet so that we can re-send it without the need to build it again.

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Constructor & Destructor Documentation

Tic9::Tic9

(

)

{
    timeoutEvent = message = NULL;
}

Tic9::~Tic9

(

)

[virtual]

{
    cancelAndDelete(timeoutEvent);
    delete message;
}

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Member Function Documentation

cMessage * Tic9::generateNewMessage

(

)

[protected, virtual]

Referenced by handleMessage(), and initialize().

{
    // Generate a message with a different name every time.
    char msgname[20];
    sprintf(msgname, "tic-%d", ++seq);
    cMessage *msg = new cMessage(msgname);
    return msg;
}

void Tic9::sendCopyOf

(

cMessage *

msg

)

[protected, virtual]

Referenced by handleMessage(), and initialize().

{
    // Duplicate message and send the copy.
    cMessage *copy = (cMessage *) msg->dup();
    send(copy, "out");
}

void Tic9::initialize

(

)

[protected, virtual]

Reimplemented from cComponent.

{
    // Initialize variables.
    seq = 0;
    timeout = 1.0;
    timeoutEvent = new cMessage("timeoutEvent");

    // Generate and send initial message.
    EV << "Sending initial message\n";
    message = generateNewMessage();
    sendCopyOf(message);
    scheduleAt(simTime()+timeout, timeoutEvent);
}

void Tic9::handleMessage

(

cMessage *

msg

)

[protected, virtual]

Reimplemented from cSimpleModule.

{
    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";
        sendCopyOf(message);
        scheduleAt(simTime()+timeout, timeoutEvent);
    }
    else // message arrived
    {
        // Acknowledgement received!
        EV << "Received: " << msg->getName() << "\n";
        delete msg;

        // Also delete the stored message and cancel the timeout event.
        EV << "Timer cancelled.\n";
        cancelEvent(timeoutEvent);
        delete message;

        // Ready to send another one.
        message = generateNewMessage();
        sendCopyOf(message);
        scheduleAt(simTime()+timeout, timeoutEvent);
    }
}

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Member Data Documentation

simtime_t Tic9::timeout [private]

Referenced by handleMessage(), and initialize().

cMessage* Tic9::timeoutEvent [private]

Referenced by handleMessage(), initialize(), Tic9(), and ~Tic9().

int Tic9::seq [private]

Referenced by generateNewMessage(), and initialize().

cMessage* Tic9::message [private]

Referenced by handleMessage(), initialize(), Tic9(), and ~Tic9().

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The documentation for this class was generated from the following file:

• txc9.cc