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定时器使用(for NS2)

2013-10-26 14:16 239 查看
AODV method:
1. define your timer in the .h file such as in the aodv.h file
class PrintTimer : public Handler {

public:

PrintTimer(AODV* a) : agent(a) {}

void handle(Event*);

private:

AODV *agent;

Event intr;

};

　
2. declare the timer in your routing agent in the .h file

class AODV : public Agent {

......

......

PrintTimer ptimer;;

.....

friend class PrintTimer;;

....

};
3. In the aodv.cc file, implement your handle function which will do what you want to do
when the timer expires
void PrintTimer::handle(Event*) {

fprintf (stderr, "This is a test for the usage of timer.\n");
//if you want to schedule this timer periodically

//#define DEFINED_DELAY 1.0 //sec

// Scheduler::instance().schedule(this, &intr, DEFINED_DELAY);

}

　
4. remember to initialize it
AODV::AODV(nsaddr_t id) : ..., ptimer(this), ... {

}

　
5. Then you can use it.
For example, in
void

AODV::recvReply(Packet *p) {
....
....
//when it receives a reply, schedule the print timer for 0.5 s
//Scheduler::instance().schedule(&ptimer, p->copy(), 0.5); //if want to process the packet

Scheduler::instance().schedule(&ptimer, new Event(), 0.5); //nothing needs to be processed
// you can also directly call the handle function, no delay
//ptimer.handle((Event*) 0);
// or
//Scheduler::instance().schedule(&ptimer, new Event(), 0.0);
....
....
}

　
Another method:
1. define your timer in your .h file such as in my sensor-agent.h file
class WakeupTimer : public TimerHandler {

public:

WakeupTimer(SensorAgent* agent) : TimerHandler() { agent_ = agent; }

void expire(Event* event);

private:

SensorAgent* agent_;

};

　
2. declare the timer in your agent as in my sensorAgent in the .h file

class sensorAgent : public Agent {

......

......

WakeupTimer wakeupTimer_;

.....

friend class WakeupTimer;

....

};
3. In sensor-agent.cc file, implement your expire function which will do what you want to do after the delay
void WakeupTimer::expire(Event* event) {

// wakeup timer has expired. switch state to probing and determine if

// this node needs to start working.

agent_->switchState(SENSOR_PROBING);

}

　
4. remember to initialize it
sensorAgent::sensorAgent() : ..., wakeupTimer_(this), ... {

}

　
5. Then you can use it
wakeupTimer_.sched(sleeping_duration);
wakeupTimer_.cancel();
With stop, restart
in .h

class helloTimer : public Handler {

public:

helloTimer(OppFwd* a) : agent(a) { busy_ = 0; }

void handle(Event*);

void start(double time);

void stop(void);

inline int busy(void) { return busy_; }

private:

OppFwd *agent;

Event intr;

int busy_;

};

in .cc

void helloTimer::handle(Event*) {

busy_ = 0;

agent->sendHello();

double interval = MinHelloInterval + ((MaxHelloInterval - MinHelloInterval) * Random::uniform());

assert(interval >= 0);

Scheduler::instance().schedule(this, &intr, interval);

}

void helloTimer::start(double time) {

Scheduler &s = Scheduler::instance();

assert(busy_ == 0);

busy_ = 1;

s.schedule(this, &intr, time);

}

void helloTimer::stop(void) {

Scheduler &s = Scheduler::instance();

assert(busy_);

s.cancel(&intr);

busy_ = 0;

}

"Couldn't schedule timer", check common/timer-handler.cc

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