org.djutils.stats.summarizers.event.EventBasedTimestampWeightedTally Maven / Gradle / Ivy
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package org.djutils.stats.summarizers.event;
import java.io.Serializable;
import java.rmi.RemoteException;
import java.util.Calendar;
import org.djutils.event.Event;
import org.djutils.event.EventListener;
import org.djutils.event.EventListenerMap;
import org.djutils.event.EventProducer;
import org.djutils.event.LocalEventProducer;
import org.djutils.event.TimedEvent;
import org.djutils.exceptions.Throw;
import org.djutils.stats.summarizers.TimestampWeightedTally;
/**
* The TimestampWeightedTally class defines a time-weighted tally based on timestamped data. The difference with a normal
* time-weighed tally is that the weight of a value is only known at the occurrence of the next timestamp. Furthermore, a last
* timestamp needs to be specified to determine the weight of the last value. This EventBased version of the tally can be
* notified with timestamps and values using the EventListenerInterface. It also produces events when values are tallied and
* when the tally is initialized. Timestamps can be Number based or Calendar based.
*
* Copyright (c) 2020-2024 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See
* for project information https://simulation.tudelft.nl. The DSOL
* project is distributed under a three-clause BSD-style license, which can be found at
*
* https://simulation.tudelft.nl/dsol/3.0/license.html.
* @author Alexander Verbraeck
*/
public class EventBasedTimestampWeightedTally extends TimestampWeightedTally implements EventProducer, EventListener
{
/** */
private static final long serialVersionUID = 20200228L;
/** The embedded EventProducer. */
private EventProducer eventProducer = null;
/**
* constructs a new EventBasedTimestampWeightedTally with a description.
* @param description String; the description of this EventBasedTimestampWeightedTally
*/
public EventBasedTimestampWeightedTally(final String description)
{
this(description, new LocalEventProducer());
}
/**
* Construct a new EventBasedTimestampWeightedTally with a description.
* @param description String; the description of this WeightedTally
* @param eventProducer EventProducer; the EventProducer to embed and use in this statistic
*/
public EventBasedTimestampWeightedTally(final String description, final EventProducer eventProducer)
{
super(description);
Throw.whenNull(eventProducer, "eventProducer cannot be null");
this.eventProducer = eventProducer;
}
/** {@inheritDoc} */
@Override
public EventListenerMap getEventListenerMap() throws RemoteException
{
return this.eventProducer.getEventListenerMap();
}
/** {@inheritDoc} */
@Override
public void initialize()
{
super.initialize();
if (this.eventProducer != null)
{
try
{
this.eventProducer.fireEvent(StatisticsEvents.INITIALIZED_EVENT);
}
catch (RemoteException exception)
{
throw new RuntimeException(exception);
}
}
}
/** {@inheritDoc} */
@Override
public void notify(final Event event)
{
if (event instanceof TimedEvent)
{
TimedEvent timedEvent = (TimedEvent) event;
double value = 0.0;
if (event.getContent() instanceof Number)
{
value = ((Number) event.getContent()).doubleValue();
}
else
{
throw new IllegalArgumentException(
"EventBasedTimestampWeightedTally.notify: Content " + event.getContent() + " should be a Number");
}
Object timestamp = timedEvent.getTimeStamp();
if (timestamp instanceof Number)
{
register(((Number) timestamp).doubleValue(), value);
}
else if (timestamp instanceof Calendar)
{
register(((Calendar) timestamp).getTimeInMillis(), value);
}
else
{
throw new IllegalArgumentException(
"EventBasedTimestampWeightedTally.notify: timestamp should be a Number or Calendar");
}
}
else
{
throw new IllegalArgumentException("EventBasedTimestampWeightedTally.notify: Event should be a TimedEvent");
}
}
/**
* Process one observed Calender-based value. The time used will be the Calendar's time in milliseconds. Silently ignore
* when a value is registered, but tally is not active, i.e. when endObservations() has been called.
* @param timestamp Calendar; the Calendar object representing the timestamp
* @param value double; the value to process
* @return double; the value
* @throws NullPointerException when timestamp is null
* @throws IllegalArgumentException when value is NaN
* @throws IllegalArgumentException when given timestamp is before last timestamp
*/
@Override
public double register(final Calendar timestamp, final double value)
{
super.register(timestamp, value);
try
{
if (hasListeners())
{
this.eventProducer.fireEvent(StatisticsEvents.TIMESTAMPED_OBSERVATION_ADDED_EVENT,
new Serializable[] {timestamp, value});
fireEvents(timestamp);
}
}
catch (RemoteException exception)
{
throw new RuntimeException(exception);
}
return value;
}
/**
* Process one observed Number-based value. Silently ignore when a value is registered, but tally is not active, i.e. when
* endObservations() has been called.
* @param timestamp Number; the object representing the timestamp
* @param value double; the value to process
* @return double; the value
* @throws NullPointerException when timestamp is null
* @throws IllegalArgumentException when value is NaN or timestamp is NaN
* @throws IllegalArgumentException when given timestamp is before last timestamp
*/
@Override
public double register(final Number timestamp, final double value)
{
super.register(timestamp, value);
try
{
if (hasListeners())
{
this.eventProducer.fireEvent(StatisticsEvents.TIMESTAMPED_OBSERVATION_ADDED_EVENT,
new Serializable[] {timestamp, value});
fireEvents(timestamp);
}
}
catch (RemoteException exception)
{
throw new RuntimeException(exception);
}
return value;
}
/**
* Explicit;y override the double value method signature of WeightedTally to call the right method.
* Process one observed double value. Silently ignore when a value is registered, but tally is not active, i.e. when
* endObservations() has been called.
* @param timestamp Number; the object representing the timestamp
* @param value double; the value to process
* @return double; the value
* @throws NullPointerException when timestamp is null
* @throws IllegalArgumentException when value is NaN or timestamp is NaN
* @throws IllegalArgumentException when given timestamp is before last timestamp
*/
@Override
public double register(final double timestamp, final double value)
{
return register((Number) Double.valueOf(timestamp), value);
}
/**
* Method that can be overridden to fire own events or additional events when registering an observation.
* @param a type for the timestamp that is Serializable and Comparable
* @param timestamp T; the timestamp to use in the TimedEvents
* @throws RemoteException on network error
*/
protected > void fireEvents(final Serializable timestamp) throws RemoteException
{
// Note that All implementations of Number are Comparable and (by default) Serializable. So is Calendar.
@SuppressWarnings("unchecked")
T castedTimestamp = (T) timestamp;
fireTimedEvent(StatisticsEvents.TIMED_N_EVENT, getN(), castedTimestamp);
fireTimedEvent(StatisticsEvents.TIMED_MIN_EVENT, getMin(), castedTimestamp);
fireTimedEvent(StatisticsEvents.TIMED_MAX_EVENT, getMax(), castedTimestamp);
fireTimedEvent(StatisticsEvents.TIMED_WEIGHTED_POPULATION_MEAN_EVENT, getWeightedPopulationMean(), castedTimestamp);
fireTimedEvent(StatisticsEvents.TIMED_WEIGHTED_POPULATION_VARIANCE_EVENT, getWeightedPopulationVariance(),
castedTimestamp);
fireTimedEvent(StatisticsEvents.TIMED_WEIGHTED_POPULATION_STDEV_EVENT, getWeightedPopulationStDev(), castedTimestamp);
fireTimedEvent(StatisticsEvents.TIMED_WEIGHTED_SUM_EVENT, getWeightedSum(), castedTimestamp);
fireTimedEvent(StatisticsEvents.TIMED_WEIGHTED_SAMPLE_MEAN_EVENT, getWeightedSampleMean(), castedTimestamp);
fireTimedEvent(StatisticsEvents.TIMED_WEIGHTED_SAMPLE_VARIANCE_EVENT, getWeightedSampleVariance(), castedTimestamp);
fireTimedEvent(StatisticsEvents.TIMED_WEIGHTED_SAMPLE_STDEV_EVENT, getWeightedSampleStDev(), castedTimestamp);
}
/** {@inheritDoc} */
@Override
@SuppressWarnings("checkstyle:designforextension")
public String toString()
{
return "EventBasedWeightedTally" + super.toString().substring("WeightedTally".length());
}
}