Examples of ptolemy.actor.util.Time

ptolemy.actor.util.Time
kipedia.org/wiki/Infinity.
This class implements the Comparable interface, where two time objects can be compared in the following way. If any of the two time objects contains an infinite time value, the rules are: a negative infinity is equal to a negative infinity and less than anything else; a positive infinity is equal to a positive infinity and bigger than anything else. If none of the time objects has an infinite time value, the time values of two time objects are compared. If the time values are the same, the two time objects are treated equal, or they represent the same model time. Otherwise, the time object containing a bigger time value is regarded to happen after the time object with a smaller time value.
All time objects share the same time resolution, which is provided by the top-level director. In some domains, such as CT and DE, users can change the time resolution by configuring the timeResolution parameter. The default value for this parameter "1E-10", which has value 10 ^-10. To preserve the consistency of time values, timeResolution can not be changed when a model is running (attempting to do so will trigger an exception). @author Haiyang Zheng, Edward A. Lee, Elaine Cheong @version $Id: Time.java,v 1.52 2007/12/07 06:26:47 cxh Exp $ @since Ptolemy II 4.1 @Pt.ProposedRating Yellow (hyzheng) @Pt.AcceptedRating Red (hyzheng)

     *  @exception TerminateProcessException If activity is scheduled
     *   to cease.
     */
    public void put(Token token) {
        Thread thread = Thread.currentThread();
        Time time = _lastTime;


        if (thread instanceof DDEThread) {
            TimeKeeper timeKeeper = ((DDEThread) thread).getTimeKeeper();
            time = timeKeeper.getOutputTime();
        }

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        synchronized (_director) {
            if ((time.compareTo(_getCompletionTime()) > 0)
                    && (_getCompletionTime().getDoubleValue() != ETERNITY)
                    && !_terminate) {
                try {
                    time = new Time(_director, INACTIVE);
                } catch (IllegalActionException e) {
                    // If the time resolution of the director is invalid,
                    // it should have been caught before this.
                    throw new InternalErrorException(e);
                }

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     *  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);
            }

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            }
        } else {
            _currentInput = null;
        }


        Time currentTime = getDirector().getModelTime();
        _currentOutput = null;


        if (_delayedOutputTokens.size() > 0) {
            if (currentTime.compareTo(_nextTimeFree) == 0) {
                TimedEvent earliestEvent = (TimedEvent) _delayedOutputTokens
                        .get();
                Time eventTime = earliestEvent.timeStamp;


                if (!eventTime.equals(currentTime)) {
                    throw new InternalErrorException("Timer time is "
                            + "reached, but output is not available.");
                }


                _currentOutput = (Token) earliestEvent.contents;

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     *  a future firing to produce it.
     *  @exception IllegalActionException If there is no director or can not
     *  schedule future firings to handle delayed input events.
     */
    public boolean postfire() throws IllegalActionException {
        Time currentTime = getDirector().getModelTime();


        // Remove the current output token from _delayedTokens.
        if (_currentOutput != null) {
            _delayedOutputTokens.take();
        }


        // If the delayedInputTokensList is not empty and the
        // delayedOutputTokens is empty (meaning the timer is ready to process
        // a new input), get the first input in the delayedInputTokensList,
        // put it into the delayedOutputTokens, and begin processing it.
        // Schedule a refiring to produce the corresponding
        // output at the time: current time + delay specified by the input
        // being processed.
        if ((_delayedInputTokensList.size() != 0)
                && _delayedOutputTokens.isEmpty()) {
            // NOTE: the input has a fixed data type as double.
            DoubleToken delayToken = (DoubleToken) _delayedInputTokensList
                    .removeFirst();
            double delay = delayToken.doubleValue();
            _nextTimeFree = currentTime.add(delay);
            _delayedOutputTokens.put(new TimedEvent(_nextTimeFree, value
                    .getToken()));
            getDirector().fireAt(this, _nextTimeFree);
        }

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        // NOTE: The amount of delay may be zero.
        // In this case, if there is already some token scheduled to
        // be produced at the current time before the current input
        // arrives, that token is produced. While the current input
        // is delayed to the next available firing at the current time.
        Time currentTime = getDirector().getModelTime();
        _currentOutput = null;


        if (_delayedOutputTokens.size() > 0) {
            TimedEvent earliestEvent = (TimedEvent) _delayedOutputTokens.get();
            Time eventTime = earliestEvent.timeStamp;


            if (eventTime.equals(currentTime)) {
                _currentOutput = (Token) earliestEvent.contents;
                output.send(0, _currentOutput);
            }
        }
    }

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     *  a firing to produce the earliest output token.
     *  @exception IllegalActionException If scheduling to refire cannot
     *  be performed or the superclass throws it.
     */
    public boolean postfire() throws IllegalActionException {
        Time currentTime = getDirector().getModelTime();
        Time delayToTime = currentTime.add(_delay);


        // Remove the token that is sent at the current time.
        if (_delayedOutputTokens.size() > 0) {
            if (_currentOutput != null) {
                _delayedOutputTokens.take();
            }
        }


        // Handle the refiring of the multiple tokens
        // that are scheduled to be produced at the same time.
        if (_delayedOutputTokens.size() > 0) {
            TimedEvent earliestEvent = (TimedEvent) _delayedOutputTokens.get();
            Time eventTime = earliestEvent.timeStamp;


            if (eventTime.equals(currentTime)) {
                getDirector().fireAt(this, currentTime);
            }
        }


        // Process the current input.

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        // Consume an input.
        if (input.hasToken(0)) {
            input.get(0);
        }


        Time currentTime = getDirector().getModelTime();


        if (_previousTime.compareTo(Time.NEGATIVE_INFINITY) != 0) {
            DoubleToken outToken = new DoubleToken(currentTime.subtract(
                    _previousTime).getDoubleValue());
            output.send(0, outToken);
        }
    }

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            throws IllegalActionException {
        // NOTE: We only remove elements from breakpoint table in this method
        // and the postfire() method of the CT director.
        boolean currentTimeIsABreakpoint = false;
        TotallyOrderedSet breakPoints = getBreakPoints();
        Time now = getModelTime();


        // If the current time is a breakpoint, remove it from table.
        if ((breakPoints != null) && !breakPoints.isEmpty()) {
            if (breakPoints.contains(now)) {
                // The current time is a break point.
                currentTimeIsABreakpoint = true;


                Time time = (Time) breakPoints.removeFirst();


                if (time.compareTo(now) < 0) {
                    // This should not happen for CTMultisolverDirector,
                    // but it is possible for CTEmbeddedDirector.
                    // When a CT refinement is made inactive for a long time
                    // and reentered, the previously stored breakpoints may
                    // be in the past... The same thing happens in the

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                _debug("The first breakpoint in the breakpoint list is at "
                        + breakpoints.first());
            }


            // NOTE: the breakpoint table is not changed.
            Time nextBreakpoint = ((Time) breakpoints.first());
            double maximAllowedStepSize = nextBreakpoint.subtract(
                    getModelTime()).getDoubleValue();


            if (maximAllowedStepSize < refinedStepSize) {
                refinedStepSize = maximAllowedStepSize;
                if (_debugging) {

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