Package net.sf.okapi.common.observer

Class WeakReferenceObservable

java.lang.Object

net.sf.okapi.common.observer.BaseObservable

net.sf.okapi.common.observer.WeakReferenceObservable

All Implemented Interfaces:

IObservable

public class WeakReferenceObservable
extends BaseObservable

Implementation of IObservable that holds references to Observers as WeakReferences. This implementation notifies the observers in a synchronous fashion. Note that this can cause trouble if you notify the observers while in a transactional context because the notification is then done also in the transaction.

This class is based on the work done by Martin Fischer. See references below.

Author:

Martin Fischer (original author), Richard Gomes, Srinivas Hasti

See Also:

Martin Fischer: Observer and Observable interfaces, Improved Observer/Observable, IObservable, IObserver, BaseObservable

Constructor Summary

Constructors

Constructor	Description
WeakReferenceObservable(IObservable observable)	Creates a new WeakReferenceObservable object with a given IObservable object.

Method Summary

Modifier and Type	Method	Description
void	addObserver(IObserver observer)	Attaches a observer to the Observable.
void	deleteObserver(IObserver observer)	Detaches a previously attached observer to the observable.

Methods inherited from class net.sf.okapi.common.observer.BaseObservable

countObservers, deleteObservers, getObservers, notifyObservers, notifyObservers, wrappedNotify

Methods inherited from class java.lang.Object

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

Constructor Detail

WeakReferenceObservable

public WeakReferenceObservable(IObservable observable)

Creates a new WeakReferenceObservable object with a given IObservable object.

Parameters:

observable - the object to observe.

Method Detail

addObserver

public void addObserver(IObserver observer)

Description copied from interface: IObservable

Attaches a observer to the Observable. After attachment the observer gets informed about changes in the Observable.

Specified by:

addObserver in interface IObservable

Overrides:

addObserver in class BaseObservable

Parameters:

observer - The observer to attach to the observable

deleteObserver

public void deleteObserver(IObserver observer)

Description copied from interface: IObservable

Detaches a previously attached observer to the observable. After detachment the observer does no longer receive change notifications from the observable.

Specified by:

deleteObserver in interface IObservable

Overrides:

deleteObserver in class BaseObservable

Parameters:

observer - The observer to detach from the observable