Examples of ptolemy.domains.de.kernel.DEEvent

ptolemy.domains.de.kernel.DEEvent
This class defines the structure of events in the DE domain. Conceptually, a DE event is a trigger that contains a tag and a reference to its destination actor. The purpose of a DE event is to schedule its destination actor to fire at the timestamp and microstep specified by its tag.
A tag is a tuple of a timestamp and a microstep. The timestamp is the model time when the event exists. The microstep defines the order of a sequence of (simultaneous) events that exist at the same model time.
A DE event is associated with a destination, which is either an actor or an IO port of an actor. A DE event, whose destination is an actor, is called a pure event. A pure event does not have a destination IO port. A DE event, whose destination is an IO port, is called a trigger event. A trigger event has a destination actor, which is the container of the destination IO port.
A DE event also has a depth, which is the topology information of its destinations. For a pure event, the depth is that of its destination actor. For a trigger event, the depth is that of its destination IO port. A larger value of depth indicates a lower priority when the simulator processes events with the same tag.
Two DE events can be compared to see which one happens first. The order is defined by the relationship between their time stamps, microsteps, and depths. See {@link DEEventQueue} for more details. DE events can be comparedby using the compareTo() method.
This class is final to improve the simulation performance because new events get created and discarded through the whole simulation. @author Lukito Muliadi, Edward A. Lee, Haiyang Zheng @version $Id: DEEvent.java,v 1.61 2005/07/08 19:58:14 cxh Exp $ @since Ptolemy II 0.2 @Pt.ProposedRating Green (hyzheng) @Pt.AcceptedRating Green (hyzheng)


        _nextIterationTime = _stopTime;


        // First look at interrupt events.
        while (!_interruptQueue.isEmpty()) {
            DEEvent interruptEvent = _interruptQueue.get();
            Time timeStamp = interruptEvent.timeStamp();


            if (timeStamp.compareTo(getModelTime()) < 0) {
                // This should never happen.
                throw new IllegalActionException(this,
                        "external input in the past: " + "input time stamp is "
                                + timeStamp + "current time in TM is "
                                + getModelTime());
            } else if (timeStamp == getModelTime()) {
                _interruptQueue.take();


                Actor actor = interruptEvent.actor();


                if (actor != null) {
                    if (actor.prefire()) {
                        actor.fire();

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                    + " request an interrupt in the past.");
        }


        if (time.compareTo(_stopTime) <= 0) {
            // create an interrupt event.
            DEEvent interruptEvent = new DEEvent(actor, time, 0, 0);
            _interruptQueue.put(interruptEvent);
        }
    }

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            }
        }


        // check the interupt queue:
        while (!_interruptQueue.isEmpty()) {
            DEEvent interruptEvent = _interruptQueue.get();
            Time timeStamp = interruptEvent.timeStamp();


            if (timeStamp.compareTo(_outsideTime) < 0) {
                // This should never happen.
                throw new IllegalActionException(this,
                        "external input in the past: " + "input time stamp is "
                                + timeStamp + "current time in TM is "
                                + getModelTime());
            } else if (timeStamp.compareTo(_outsideTime) == 0) {
                _interruptQueue.take();


                Actor actor = interruptEvent.actor();


                if (actor != null) {
                    if (actor.prefire()) {
                        actor.fire();

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ptolemy.domains.tm.kernel.TMDirector

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