private void handleNCalc(SinkData channel, Time currentTime)
throws NoTokenException, IllegalActionException {
// Method to handle the fourth stage, where we listen to the first synchronisation pulse to find
// the value of n
System.out.println(channel.nextFireTime.getDoubleValue() >= currentTime.getDoubleValue() + 0.4);
if (channel.nextFireTime.getDoubleValue() >= currentTime.getDoubleValue()) {
input.get(0);
return;
} else if (channel
.secondRun) { // If we are on the second run through, we have already transmitted twice so
// we can stop here
channel.state = states.FINISHED;
return;
} else if (currentTime.subtract(channel.nextFireTime).getDoubleValue()
> 2) { // There is a large delta between when we were supposed to fire and when we fired, so
// we probably have a collision with another channel
channel.secondRun = true; // Store that we will need to go around again for this channel
channel.state = states.FIRSTRX; // Set the stage back to the beginning so we can restart
System.out.println(
"NCALC on channel "
+ currentChannel
+ " n is: "
+ channel.n
+ ". t is "
+ channel.t
+ ". nextFireTime is "
+ channel.nextFireTime
+ " currentTime is "
+ currentTime);
nextChannel(currentChannel, currentTime);
} else {
channel.n = ((IntToken) input.get(0)).intValue();
setNextFireTime(
channel, currentTime.getDoubleValue() + (channel.t.getDoubleValue() * channel.n));
channel.state = states.SECONDTX;
System.out.println(
"NCALC on channel "
+ currentChannel
+ " n is: "
+ channel.n
+ ". t is "
+ channel.t
+ ". nextFireTime is "
+ channel.nextFireTime
+ " currentTime is "
+ currentTime);
nextChannel(currentChannel, currentTime);
removeFromQueue(currentChannel);
}
}
private void handleSecondRX(SinkData channel, Time currentTime)
throws NoTokenException, IllegalActionException {
// Method to handle the second stage, receiving the second synchronisation pulse
if (!channel
.secondRun) { // If this is the second time we have received packets on the channel we
// already have t so no need to calculate it
channel.t = currentTime.subtract(channel.t);
}
int currentValue = ((IntToken) input.get(0)).intValue(); // Retrieve the value from the input
if (channel.firstValue == 1 && currentValue == 1) { // If the first two values are 1 then n is 1
channel.n = 1;
channel.t =
new Time(getDirector())
.add(
channel.t.getDoubleValue()
/ 12); // Calculate t given that n is 1, i.e divide the period by 12 as per
// the protocol
}
setNextFireTime(
channel,
currentTime.getDoubleValue()
+ (channel.t.getDoubleValue()
* currentValue)); // Manually set the next fire time for this channel
channel.state = states.FIRSTTX; // Set the channel state to the next stage
System.out.println(
"SECONDRX on channel "
+ currentChannel
+ ". Current value is "
+ currentValue
+ ". t is "
+ channel.t
+ ". nextFireTime is "
+ channel.nextFireTime
+ " currentTime is "
+ currentTime);
nextChannel(currentChannel, currentTime);
removeFromQueue(currentChannel); // We can now move onto listening on the next channel
}
