org.objectweb.proactive.benchmarks.timit.util.observing
Class RealEventObservable

java.lang.Object
  org.objectweb.proactive.benchmarks.timit.util.observing.RealEventObservable

All Implemented Interfaces:

java.io.Serializable, EventObservable

public class RealEventObservable
extends java.lang.Object
implements EventObservable

This class is the Observable. Part of the specialized Observer/Observable pattern.

Author:

Brian Amedro, Vladimir Bodnartchouk

See Also:

Serialized Form

Constructor Summary

RealEventObservable()
Construct an Observable with zero Observers.

Method Summary

void	addObserver(EventObserver o) Adds an observer to the set of observers for this object, provided that it is not the same as some observer already in the set.
void	clearChanged() Indicates that this object has no longer changed, or that it has already notified all of its observers of its most recent change, so that the hasChanged method will now return false.
int	countObservers() Returns the number of observers of this Observable object.
void	deleteObserver(EventObserver o) Deletes an observer from the set of observers of this object.
void	deleteObservers() Clears the observer list so that this object no longer has any observers.
EventDataBag	getEventDataBag(int subjectRank) Returns a vector of StatData of the Observers of the current Observable object.
boolean	hasChanged() Tests if this object has changed.
void	notifyObservers() If this object has changed, as indicated by the hasChanged method, then notify all of its observers and then call the clearChanged method to indicate that this object has no longer changed.
void	notifyObservers(java.lang.Object arg) If this object has changed, as indicated by the hasChanged method, then notify all of its observers and then call the clearChanged method to indicate that this object has no longer changed.
void	setChanged() Marks this Observable object as having been changed; the hasChanged method will now return true.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RealEventObservable

public RealEventObservable()

Construct an Observable with zero Observers.

Method Detail

addObserver

public void addObserver(EventObserver o)

Adds an observer to the set of observers for this object, provided that it is not the same as some observer already in the set. The order in which notifications will be delivered to multiple observers is not specified. See the class comment.

Specified by:

addObserver in interface EventObservable

Parameters:

o - an observer to be added.

Throws:

java.lang.NullPointerException - if the parameter o is null.

deleteObserver

public void deleteObserver(EventObserver o)

Deletes an observer from the set of observers of this object. Passing null to this method will have no effect.

Specified by:

deleteObserver in interface EventObservable

Parameters:

o - the observer to be deleted.

notifyObservers

public void notifyObservers()

If this object has changed, as indicated by the hasChanged method, then notify all of its observers and then call the clearChanged method to indicate that this object has no longer changed.

Each observer has its update method called with two arguments: this observable object and null. In other words, this method is equivalent to:

notifyObservers(null)

Specified by:

notifyObservers in interface EventObservable

See Also:

Observable.clearChanged(), Observable.hasChanged(), Observer.update(java.util.Observable, java.lang.Object)

notifyObservers

public void notifyObservers(java.lang.Object arg)

If this object has changed, as indicated by the hasChanged method, then notify all of its observers and then call the clearChanged method to indicate that this object has no longer changed.

Each observer has its update method called with two arguments: this observable object and the arg argument.

Specified by:

notifyObservers in interface EventObservable

Parameters:

arg - any object.

See Also:

Observable.clearChanged(), Observable.hasChanged(), Observer.update(java.util.Observable, java.lang.Object)

deleteObservers

public void deleteObservers()

Clears the observer list so that this object no longer has any observers.

Specified by:

deleteObservers in interface EventObservable

setChanged

public void setChanged()

Marks this Observable object as having been changed; the hasChanged method will now return true.

Specified by:

setChanged in interface EventObservable

clearChanged

public void clearChanged()

Indicates that this object has no longer changed, or that it has already notified all of its observers of its most recent change, so that the hasChanged method will now return false. This method is called automatically by the notifyObservers methods.

Specified by:

clearChanged in interface EventObservable

See Also:

Observable.notifyObservers(), Observable.notifyObservers(java.lang.Object)

hasChanged

public boolean hasChanged()

Tests if this object has changed.

Specified by:

hasChanged in interface EventObservable

Returns:

true if and only if the setChanged method has been called more recently than the clearChanged method on this object; false otherwise.

See Also:

Observable.clearChanged(), Observable.setChanged()

countObservers

public int countObservers()

Returns the number of observers of this Observable object.

Specified by:

countObservers in interface EventObservable

Returns:

the number of observers of this object.

getEventDataBag

public EventDataBag getEventDataBag(int subjectRank)

Returns a vector of StatData of the Observers of the current Observable object.

Specified by:

getEventDataBag in interface EventObservable

Returns:

the vector of observed datas.