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);
}
/**
* If the argument is the meanTime parameter, check that it is positive.
*
* @param attribute The attribute that changed.
* @exception IllegalActionException If the meanTime value is not positive.
*/
@Override
public void attributeChanged(Attribute attribute) throws IllegalActionException {
if (attribute == meanTime) {
double mean = ((DoubleToken) meanTime.getToken()).doubleValue();
if (mean <= 0.0) {
throw new IllegalActionException(
this, "meanTime is required to be positive. meanTime given: " + mean);
}
} else if (attribute == values) {
ArrayToken val = (ArrayToken) values.getToken();
$ASSIGN$_length(val.length());
} else if (attribute == stopTime) {
double newStopTimeValue = ((DoubleToken) stopTime.getToken()).doubleValue();
if (_executing) {
Time newStopTime = new Time(getDirector(), newStopTimeValue);
Director director = getDirector();
if (director != null) {
Time currentTime = director.getModelTime();
if (newStopTime.compareTo(currentTime) > 0) {
director.fireAt(this, newStopTime);
} else {
throw new IllegalActionException(
this, "The stop time " + "is earlier than the current time.");
}
}
$ASSIGN$_stopTime(newStopTime);
}
} else {
super.attributeChanged(attribute);
}
}
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);
}
/**
* Request the first firing either at the start time or at a random time, depending on
* <i>fireAtStart</i>.
*
* @exception IllegalActionException If the fireAt() method of the director throws it, or if the
* director does not agree to fire the actor at the specified time.
*/
@Override
public void initialize() throws IllegalActionException {
super.initialize();
Director director = getDirector();
if (director == null) {
throw new IllegalActionException(this, "No director!");
}
double stopTimeValue = ((DoubleToken) stopTime.getToken()).doubleValue();
$ASSIGN$_stopTime(new Time(getDirector(), stopTimeValue));
Time currentTime = director.getModelTime();
if (!_stopTime.isInfinite() && _stopTime.compareTo(currentTime) > 0) {
director.fireAt(this, _stopTime);
$ASSIGN$_executing(true);
}
$ASSIGN$_nextOutputIndex(0);
$ASSIGN$_nextFiringTime(currentTime);
$ASSIGN$_outputProduced(false);
if (((BooleanToken) fireAtStart.getToken()).booleanValue()) {
_fireAt(currentTime);
} else {
_generateRandomNumber();
$ASSIGN$_nextFiringTime(director.getModelTime().add(_current));
_fireAt(_nextFiringTime);
}
}
/**
* If this firing is triggered by an event at <i>waitee</i>, then output the waiting time for each
* prior event arrival at <i>waiter</i> since the last arrival of waitee. If there is no event at
* <i>waitee</i>, then record the time of arrival of the events at <i>waiter</i>, and produce no
* output.
*
* @exception IllegalActionException If get() or send() throws it.
*/
public void fire() throws IllegalActionException {
super.fire();
Time currentTime = ((DEDirector) getDirector()).getModelTime();
while (waiter.hasToken(0)) {
waiter.get(0);
_waiting.addElement(currentTime);
}
boolean godot = false;
while (waitee.hasToken(0)) {
waitee.get(0);
godot = true;
}
if (godot) {
for (int i = 0; i < _waiting.size(); i++) {
Time previousTime = (Time) _waiting.elementAt(i);
DoubleToken outToken = new DoubleToken(currentTime.subtract(previousTime).getDoubleValue());
output.send(0, outToken);
}
_waiting.removeAllElements();
}
}
/**
* If the <i>stopTime</i> parameter is changed and the model is executing, then if the new value
* is greater than zero and greater than the current time, then ask the director to fire this
* actor at that time. If the new value is less than the current time, then request refiring at
* the current time.
*
* @exception IllegalActionException If the superclass throws it.
*/
public void attributeChanged(Attribute attribute) throws IllegalActionException {
if (attribute == stopTime) {
double newStopTimeValue = ((DoubleToken) stopTime.getToken()).doubleValue();
if (_executing) {
Time newStopTime = new Time(getDirector(), newStopTimeValue);
Director director = getDirector();
if (director != null) {
Time currentTime = director.getModelTime();
if (newStopTime.compareTo(currentTime) > 0) {
director.fireAt(this, newStopTime);
} else {
throw new IllegalActionException(
this, "The stop time " + "is earlier than the current time.");
}
}
_stopTime = newStopTime;
}
} else {
super.attributeChanged(attribute);
}
}
/**
* Return false if the current time is greater than or equal to the <i>stopTime</i> parameter
* value. Otherwise, return true. Derived classes should call this at the end of their postfire()
* method and return its returned value.
*
* @exception IllegalActionException Not thrown in this base class.
*/
public boolean postfire() throws IllegalActionException {
Time currentTime = getDirector().getModelTime();
if (currentTime.compareTo(_stopTime) >= 0) {
return false;
}
return true;
}
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);
}
}
/**
* If the current time matches the expected time for the next output, then return true. Also
* return true if the trigger input is connected and has events. Otherwise, return false.
*
* @exception IllegalActionException If there is no director.
*/
@Override
public boolean prefire() throws IllegalActionException {
if (_debugging) {
_debug("Called prefire()");
}
for (int i = 0; i < trigger.getWidth(); i++) {
if (trigger.isKnown() && trigger.hasToken(i)) {
return true;
}
}
Time currentTime = getDirector().getModelTime();
if (currentTime.compareTo(_nextFiringTime) == 0) {
return true;
}
return false;
}
private void nextChannel(int currentChannel, Time currentTime) throws IllegalActionException {
System.out.println("NEXT CHANNEL at" + currentTime);
removeFromQueue(currentChannel);
channelQueue.add(currentChannel);
nextChannel = channelQueue.peek();
changeChan = true;
getDirector().fireAt(this, currentTime.add(0.0000001));
}
public void initialize() throws IllegalActionException {
super.initialize();
init_tim = ((DoubleToken) initial_time.getToken()).doubleValue();
current_time = getDirector().getModelTime();
firstSend = current_time.add(init_tim);
getDirector().fireAt(this, firstSend);
// Get the simulation Stop time
DEstop_time = getDirector().getModelStopTime();
stop_time = DEstop_time.getDoubleValue();
if (_debugging) _debug("GET STOP TIME: ");
}
/**
* If the current time matches one of the times that we have previously recorded as the reception
* time for a transmission, then deliver the token to the receiver.
*
* @exception IllegalActionException If the _transmitTo() method of the base class throws it, i.e.
* the token attribute of the reception cannot be converted or the token attribute is null and
* the receiver attribute of the receptions does not support clear.
*/
public void fire() throws IllegalActionException {
super.fire();
if (_receptions != null) {
// We may be getting fired because of an impending event.
Time currentTime = getDirector().getModelTime();
Double timeDouble = Double.valueOf(currentTime.getDoubleValue());
Reception reception = (Reception) _receptions.get(timeDouble);
if (reception != null) {
// The time matches a pending reception.
_receptions.remove(timeDouble);
// Use the superclass, not this class, or we just delay again.
super._transmitTo(
reception.token, reception.sender, reception.receiver, reception.properties);
}
}
}
/**
* Generate an exponential random number and schedule the next firing.
*
* @exception IllegalActionException If the director throws it when scheduling the next firing, or
* if the director does not agree to fire the actor at the specified time.
*/
@Override
public boolean postfire() throws IllegalActionException {
boolean result = super.postfire();
Time currentTime = getDirector().getModelTime();
if (_outputProduced) {
$ASSIGN$_outputProduced(false);
$ASSIGN$SPECIAL$_nextOutputIndex(11, _nextOutputIndex);
if (_nextOutputIndex >= _length) {
$ASSIGN$_nextOutputIndex(0);
}
$ASSIGN$_nextFiringTime(currentTime.add(_current));
_fireAt(_nextFiringTime);
} else if (currentTime.compareTo(_nextFiringTime) >= 0) {
_fireAt(currentTime);
}
if (currentTime.compareTo(_stopTime) >= 0) {
return false;
}
return result;
}
/**
* Transmit the specified token to the specified receiver with the specified properties. If
* <i>propagationSpeed</i> is less than Infinity, then this results in a call to fireAt() of the
* director for each receiver that is in range. The token is not actually transmitted to the
* receiver until the corresponding invocation of fire() occurs. The time delay is equal to
* distance/<i>propagationSpeed</i>. See the class comments for the assumptions that make this
* correct.
*
* <p>If the <i>lossProbability</i> is zero, (the default) then the specified receiver will
* receive the token if it has room. If <i>lossProbability</i> is greater than zero, the token
* will be lost with the specified probability, independently for each receiver in range. Note
* that in this base class, a port is in range if it refers to this channel by name and is at the
* right place in the hierarchy. This base class makes no use of the properties argument. But
* derived classes may limit the range or otherwise change transmission properties using this
* argument.
*
* @param token The token to transmit, or null to clear the specified receiver.
* @param sender The sending port.
* @param receiver The receiver to which to transmit.
* @param properties The transmit properties (ignored in this base class).
* @exception IllegalActionException If the token cannot be converted or if the token argument is
* null and the destination receiver does not support clear.
*/
protected void _transmitTo(
Token token, WirelessIOPort sender, WirelessReceiver receiver, RecordToken properties)
throws IllegalActionException {
double speed = ((DoubleToken) propagationSpeed.getToken()).doubleValue();
if (speed == Double.POSITIVE_INFINITY) {
super._transmitTo(token, sender, receiver, properties);
} else {
Director director = getDirector();
// FIXME: This isn't right because the receiver
// may have moved during propagation. Maybe
// register a ValueListener to the _location attributes
// of the receiver actors, and continually recalculate
// the correct arrival time for the message each time the
// receiver location changes. Even so, this will be
// an approximation, and needs to be fully characterized.
// Also, the receiver needs to be in range at the
// conclusion of the propagation, whereas this method is
// called only if the receiver is in range at the
// initiation of the transmission.
WirelessIOPort destination = (WirelessIOPort) receiver.getContainer();
double distance = _distanceBetween(sender, destination);
Time time = director.getModelTime().add(distance / speed);
if (_receptions == null) {
_receptions = new HashMap();
}
Double timeDouble = Double.valueOf(time.getDoubleValue());
Reception reception = new Reception();
reception.token = token;
reception.sender = sender;
reception.receiver = receiver;
reception.properties = properties;
_receptions.put(timeDouble, reception);
_fireAt(time);
}
}
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
}
// NOTE: No clone() method, so don't clone this.
public void fire() throws IllegalActionException {
super.fire();
double increment = 0.0;
if ((input.getWidth() > 0) && input.hasToken(0)) {
DoubleToken in = (DoubleToken) input.get(0);
increment = in.doubleValue();
}
output.broadcast(new DoubleToken(value + increment));
value += 1.0;
Director director = getDirector();
Time time = director.getModelTime();
count++;
if (count >= 5) {
director.fireAt(this, time.add(1.0));
count = 0;
} else {
director.fireAt(this, time);
}
}
/**
* Output the current value.
*
* @exception IllegalActionException If there is no director.
*/
@Override
public void fire() throws IllegalActionException {
boolean triggerInputPresent = false;
for (int i = 0; i < trigger.getWidth(); i++) {
if (trigger.isKnown() && trigger.hasToken(i)) {
triggerInputPresent = true;
}
}
Director director = getDirector();
Time currentTime = director.getModelTime();
boolean timeForOutput = currentTime.compareTo(_nextFiringTime) >= 0;
if (!timeForOutput && !triggerInputPresent) {
return;
}
if (director instanceof SuperdenseTimeDirector) {
int currentMicrostep = ((SuperdenseTimeDirector) director).getIndex();
if (currentMicrostep < 1 && !triggerInputPresent) {
return;
}
}
super.fire();
output.send(0, _getValue(_nextOutputIndex));
$ASSIGN$_outputProduced(true);
}
/**
* State machine responsable by receiving the traffic from the data_in port, disassembly the
* pcredit_outage and send its flits to the output ports (file). If the data_in does not have a
* token, suspend firing and return.
*
* @exception IllegalActionException If there is no director.
*/
public void fire() throws IllegalActionException {
super.fire();
if (_debugging) _debug("fire current_time: " + getDirector().getModelTime());
// getting current Time
current_time = getDirector().getModelTime();
compare_time = current_time.getDoubleValue();
// if(firstSend.compareTo(compare_time) == 0.0){
if (compare_time == init_tim) {
send_msg.send(0, new IntToken("1"));
if (_debugging) _debug("FIRST sent at: " + compare_time);
if (compare_time <= stop_time) {
new_send = ((DoubleToken) interval.getToken()).doubleValue();
nextSend = current_time.add(new_send);
getDirector().fireAt(this, nextSend);
if (_debugging) _debug("after first send at: " + nextSend);
// Requests to the director to be fire() at the window sample
}
} else if (compare_time < init_tim) {
firstSend = current_time.add(init_tim);
getDirector().fireAt(this, firstSend);
if (_debugging) _debug("init_tim at: " + init_tim + " first send at " + firstSend);
} else if (current_time.getDoubleValue() == nextSend.getDoubleValue()) {
nextSend = nextSend.add(new_send);
send_msg.send(0, new IntToken("2"));
if (_debugging) _debug("msg sent at: " + compare_time);
if (_debugging) _debug("NEXT SEND AT: " + nextSend);
getDirector().fireAt(this, nextSend);
} else if (current_time.getDoubleValue() != nextSend.getDoubleValue()) {
if (_debugging) _debug("NAO ROLOU " + compare_time);
}
} // end public
public void fire() throws IllegalActionException {
Time currentTime =
getDirector().getModelTime(); // Get the model time to be used for various calculations
if (changeChan) { // Check if we need to change the channel in this fire period
setChannel(nextChannel); // Change to the next required channel
changeChan = false; // Return to normal operation upon the next fire
if (input.hasToken(
0)) { // If this fire was initiated by a token on the input, consume it to avoid loops
input.get(0);
}
} else if (input.hasToken(0)) { // Wireless token has been received f
SinkData channel =
channelStore.get(currentChannel); // Retrieve the information for the current channel
switch (channel.state) { // Determine what stage of the system we are at
case FIRSTRX: // Stage one, we will be receiving the first synchronisation packet
handleFirstRX(channel, currentTime);
break;
case SECONDRX: // Stage two, we will be receiving the second synchronisation packet
handleSecondRX(channel, currentTime);
break;
case NCALC: // Stage 4, we will be receiving the first synchronisation packet of the
// sequence to ascertain the n value
handleNCalc(channel, currentTime);
break;
default: // We are in a state that does not require an input token, so we discard it
input.get(0);
break;
}
} else { // No token has been received so it is a fire initiated by the source and not a token
// on the input
SinkData channel = null; // Initialise a channel to be used later
int desiredChannelNum =
currentChannel; // Initialise a variable to store the channel required for this firing
for (int channelNum :
channelStore
.keySet()) { // We need to find the channel that has caused the actor to be fired in
// this time period
channel =
channelStore.get(channelNum); // Retrieve the information for the channel being checked
if (channel.nextFireTime != null
&& channel.state
!= states.FINISHED) { // If we have a valid firing time, that has been initialised
if (!channel.nextFireTime.equals(
currentTime)) { // We are on an incorrect channel, continue searching
continue;
} else { // We have found the correct channel
desiredChannelNum = channelNum; // Set the desired channel to the channel we have found
break;
}
}
}
if (currentChannel == desiredChannelNum) { // If we are on the channel that we desire
System.out.println(
channel.nextFireTime.getDoubleValue() <= currentTime.getDoubleValue() + 0.4);
if (channel.nextFireTime.getDoubleValue()
<= currentTime.getDoubleValue() + 0.4) { // If we are not too early for the firing time
switch (channel.state) { // Determine what stage of the system we are at
case FIRSTTX: // Stage 3, we are in the receive period for the channels sink so we can
// transmit a packet
handleFirstTX(channel, currentTime);
changeChan = true; // Change back to the channel back to what we had previously
getDirector().fireAt(this, currentTime.add(0.000001));
break;
case SECONDTX: // Stage 5, we are in the receive period for the second time, so we can
// transmit a packet
handleSecondTX(channel, currentTime);
changeChan = true; // Change back to the channel back to what we had previously
getDirector().fireAt(this, currentTime.add(0.000001));
break;
}
}
} else if (desiredChannelNum
!= 0) { // We are not on the desired channel, so we have to change to it
// System.out.println(currentChannel + " : " + desiredChannelNum);
nextChannel =
currentChannel; // Set the channel we will change back to after the transmit to our
// current channel
setChannel(desiredChannelNum); // Set the channel to the desired channel
channel.nextFireTime =
currentTime.add(
0.0000001); // Set the channels fire time to when we are firing it so we can detect
// which channel fired
getDirector()
.fireAt(
this,
currentTime.add(0.0000001)); // Fire the actor again so we can process the transmit
}
}
}
/**
* Schedule a new actor for execution on the next available scheduler and return the next time
* this scheduler has to perform a reschedule.
*
* @param actor The actor to be scheduled.
* @param currentPlatformTime The current platform time.
* @param deadline The deadline of the event.
* @param executionTime The execution time of the actor.
* @return Relative time when this Scheduler has to be executed again.
* @exception IllegalActionException Thrown if actor parameters such as execution time or priority
* cannot be read.
*/
@Override
public Time schedule(NamedObj actor, Time currentPlatformTime, Time deadline, Time executionTime)
throws IllegalActionException {
super.schedule(actor, currentPlatformTime, deadline, executionTime);
Time minimumRemainingTime = null;
// Check if is already executing somewhere.
for (NamedObj schedulerActor : _actors) {
AtomicExecutionAspect scheduler = (AtomicExecutionAspect) schedulerActor;
if (scheduler.getRemainingTime(actor) != null
&& scheduler.getRemainingTime(actor).getDoubleValue() > 0.0) {
// This actor is currently executing on this scheduler.
Time time = scheduler.schedule(actor, currentPlatformTime, deadline, executionTime);
notifyExecutionListeners(
scheduler, currentPlatformTime.getDoubleValue(), ExecutionEventType.START);
if (time.getDoubleValue() == 0.0) {
notifyExecutionListeners(
scheduler, currentPlatformTime.getDoubleValue(), ExecutionEventType.STOP);
}
_remainingTimeOnCore.put(scheduler, time);
_lastActorFinished = scheduler.lastActorFinished();
return time;
}
}
// Its not executing anywhere, find free core.
for (NamedObj schedulerActor : _actors) {
AtomicExecutionAspect scheduler = (AtomicExecutionAspect) schedulerActor;
if (scheduler == this) {
continue;
}
Time remainingTime = _remainingTimeOnCore.get(scheduler);
if (remainingTime == null || remainingTime.getDoubleValue() == 0.0) {
Time time = scheduler.schedule(actor, currentPlatformTime, deadline, executionTime);
notifyExecutionListeners(
scheduler, currentPlatformTime.getDoubleValue(), ExecutionEventType.START);
if (time.getDoubleValue() == 0.0) {
notifyExecutionListeners(
scheduler, currentPlatformTime.getDoubleValue(), ExecutionEventType.STOP);
}
_remainingTimeOnCore.put(scheduler, time);
_lastActorFinished = scheduler.lastActorFinished();
return time;
} else {
if (minimumRemainingTime == null || minimumRemainingTime.compareTo(remainingTime) > 0) {
minimumRemainingTime = remainingTime;
}
}
}
return minimumRemainingTime;
}
/**
* Get the predicted quantization-event time for a state (QSS-specific).
*
* @param stateIdx The state index.
* @param quantEvtTimeMax The maximum quantization event time.
*/
protected final Time _predictQuantizationEventTimeWorker(
final int stateIdx, final Time quantEvtTimeMax) {
// Note the superclass takes care of updating status variables and
// storing the returned result.
// Initialize.
final ModelPolynomial qStateMdl = _qStateMdls[stateIdx];
final ModelPolynomial cStateMdl = _cStateMdls[stateIdx];
final double dq = _dqs[stateIdx];
// Check internal consistency.
assert (dq > 0);
assert (quantEvtTimeMax.getDoubleValue() > 0);
assert (quantEvtTimeMax.compareTo(qStateMdl.tMdl) > 0);
assert (quantEvtTimeMax.compareTo(cStateMdl.tMdl) > 0);
// Find predicted quantization-event time, as change from {tMostRecent}.
Time tMostRecent;
double dt;
if (qStateMdl.tMdl.compareTo(cStateMdl.tMdl) > 0) {
// Here, most recent event was a quantization-event.
tMostRecent = qStateMdl.tMdl;
dt = _predictQuantizationEventDeltaTimeQSS2QFromC(qStateMdl, cStateMdl, dq, _exactInputs);
} else {
// Here, most recent event was a rate-event.
tMostRecent = cStateMdl.tMdl;
dt = _predictQuantizationEventDeltaTimeQSS2General(qStateMdl, cStateMdl, dq, _exactInputs);
}
// Require {dt} > 0.
if (dt <= 0) {
// In exact arithmetic, and if the integrator is being stepped properly,
// this should never happen. However, if the integrator stepped to a
// time very close to the previous predicted quantization-event time,
// or given a small numerator and large denominator in expressions
// above, can get nonpositive {dt}.
// Reset to as small a value as can manage.
// Use the `ulp`, the "units in the last place". From the
// documentation at {http://docs.oracle.com/javase/7/docs/api/java/lang/Math.html}:
// "For a given floating-point format, an ulp of a specific real
// number value is the distance between the two floating-point
// values bracketing that numerical value."
// TODO: Construct integrator with "min time step" parameter,
// and pass it in for use it here.
dt = java.lang.Math.ulp(tMostRecent.getDoubleValue());
}
// Bound result to reasonable limits.
// At lower end, need a positive number that, when added to {tMostRecent},
// produces a distinct time.
// At upper end, can't be larger than {quantEvtTimeMax}.
Time predQuantEvtTime;
while (true) {
if (quantEvtTimeMax.subtractToDouble(tMostRecent) <= dt) {
// Here, tMostRecent + dt >= quantEvtTimeMax.
// Note determined this case in a slightly roundabout way, since
// simply adding {dt} to {tMostRecent} may cause problems if {quantEvtTimeMax}
// reflects some inherent limitation of class {Time}.
predQuantEvtTime = quantEvtTimeMax;
break;
}
// Here, tMostRecent + dt < quantEvtTimeMax.
predQuantEvtTime = tMostRecent.addUnchecked(dt);
if (predQuantEvtTime.compareTo(tMostRecent) > 0) {
// Here, added {dt} and got a distinct, greater, time.
break;
}
// Here, {dt} so small that can't resolve difference from {tMostRecent}.
dt *= 2;
}
return (predQuantEvtTime);
}
/**
* If a new message is available at the inputs, record it in the list indexed with the time that
* the message shall be completed, and loop through the list to check whether there is collision.
* If the current time matches one of the times that we have previously recorded as the completion
* time for a transmission, then output the received message to the <i>received</i> output port if
* it is not lost to a collision; otherwise, output it to the <i>collided</i> output port.
*
* @exception IllegalActionException If an error occurs reading or writing inputs or outputs.
*/
public void fire() throws IllegalActionException {
super.fire();
Time currentTime = getDirector().getModelTime();
if (_debugging) {
_debug("---------------------------------");
_debug("Current time is: " + currentTime);
}
if (message.hasToken(0) && power.hasToken(0) && duration.hasToken(0)) {
double powerValue = ((DoubleToken) power.get(0)).doubleValue();
if (_debugging) {
_debug("Received message with power: " + powerValue);
}
if (powerValue < _powerThreshold) {
// The signal it too weak to be detected, simply drop it.
message.get(0);
duration.get(0);
if (_debugging) {
_debug("Message power is below threshold. Ignoring.");
}
} else {
// Record the reception.
Reception reception = new Reception();
reception.data = message.get(0);
reception.power = powerValue;
reception.arrivalTime = currentTime.getDoubleValue();
reception.collided = false;
reception.duration = ((DoubleToken) duration.get(0)).doubleValue();
if (_debugging) {
_debug("Message is above threshold and has duration: " + reception.duration);
}
// Update the total power density.
_totalPower = _totalPower + reception.power;
// Put the new reception into the list of prior receptions.
Time time = currentTime.add(reception.duration);
reception.expiration = time.getDoubleValue();
_receptions.add(reception);
// Schedule this actor to be fired at the end of
// the duration of the message.
_fireAt(time);
}
}
// Loop through the prior receptions (and the new one)
// to mark whether a message is collided according to the new total
// power density. Also, any prior receptions that are now
// expiring are sent to one of the two outputs.
Iterator priorReceptions = _receptions.listIterator();
while (priorReceptions.hasNext()) {
Reception priorReception = (Reception) priorReceptions.next();
if (_debugging) {
_debug("Checking reception with arrival time: " + priorReception.arrivalTime);
}
// If the reception is now expiring, send it to one of the two
// output ports.
if (priorReception.expiration == currentTime.getDoubleValue()) {
if (_debugging) {
_debug(
"Current time matches expiration "
+ "time of a prior message that arrived at: "
+ priorReception.arrivalTime);
}
// The time matches a pending reception.
priorReceptions.remove();
// Update the total power.
_totalPower = _totalPower - priorReception.power;
// Quantization errors may take this negative. Do not allow.
if (_totalPower < 0.0) {
_totalPower = 0.0;
}
if (!priorReception.collided) {
received.send(0, priorReception.data);
if (_debugging) {
_debug("Message has been received: " + priorReception.data);
}
} else {
collided.send(0, priorReception.data);
if (_debugging) {
_debug("Message has been lost: " + priorReception.data);
}
}
continue;
}
// Check the snr to see whether to mark this prior reception
// collided.
double powerWithoutThisOne = _totalPower - priorReception.power;
// Quantization errors may make this negative.
if (powerWithoutThisOne < 0.0) {
powerWithoutThisOne = 0.0;
}
double snr = priorReception.power / powerWithoutThisOne;
if (!priorReception.collided && (snr <= _SNRThresholdInDB)) {
priorReception.collided = true;
if (_debugging) {
_debug(
"Message now has a collision. SNR is: " + snr + ". Total power is: " + _totalPower);
}
}
}
}
