private void handleFirstTX(SinkData channel, Time currentTime) throws NoRoomException, IllegalActionException { // Method to handle the third stage, transmitting the first packet to a sink IntToken token = new IntToken(currentChannel); // Create a token to send output.send(0, token); // Send the token if (channel.n != null) { // If we have already calculated n in a previous stage (if n is 1) we can skip // straight to the next transmission period setNextFireTime(channel, currentTime.getDoubleValue() + (channel.t.getDoubleValue() * 12)); channel.state = states.SECONDTX; } else { // If we do not know n then we need to next fire at the beginning of the next // synchronisation phase so we can receive the first pulse and find n setNextFireTime( channel, currentTime.getDoubleValue() + (channel.t.getDoubleValue() * 11) - 0.02); channel.state = states.NCALC; } System.out.println( "FIRSTTX on channel " + currentChannel + ". t is " + channel.t + ". nextFireTime is " + channel.nextFireTime + " currentTime is " + currentTime); }
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 handleFirstRX(SinkData channel, Time currentTime) throws NoTokenException, IllegalActionException { // Method to handle the first stage, receiving the first synchronisation pulse IntToken token = (IntToken) input.get(0); // Retrieve the token from the input Time timeDelta = currentTime.subtract( waitTime); // Calculate a delta between the current time and when the channel was // changed, to find the waiting time if (timeDelta.getDoubleValue() <= 1.5 && token.equals( 1)) { // Token is 1, and we have been waiting for longer than 1.5s. So we will not have // a follow-up token, so can't be used for determining t channelQueue .remove(); // Send the current channel to the back of the queue so we can do something // useful while it is in its sleep state channelQueue.add(currentChannel); return; } if (!channel .secondRun) { // If this is the first time we have received packets on the channel we will // need the current time to calculate a t channel.t = currentTime; } channel.state = states.SECONDRX; // Set the channel state to the next stage channel.firstValue = token.intValue(); // Store the value we have received System.out.println("FIRSTRX on channel " + currentChannel + " currentTime is " + currentTime); }
private void handleSecondTX(SinkData channel, Time currentTime) throws IllegalActionException { IntToken token = new IntToken(currentChannel); output.send(0, token); channel.state = states.FINISHED; System.out.println( "SECONDTX on channel " + currentChannel + ". t is " + channel.t + " currentTime is " + currentTime); System.out.println(channelQueue.toString()); }
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 }