public final class WeakInvalidationListener extends java.lang.Object implements InvalidationListener, WeakListener
WeakInvalidationListenercan be used, if an
Observableshould only maintain a weak reference to the listener. This helps to avoid memory leaks, that can occur if observers are not unregistered from observed objects after use.
WeakInvalidationListener are created by passing in the original
then be registered to listen for changes of the observed object.
Note: You have to keep a reference to the
was passed in as long as it is in use, otherwise it will be garbage collected
|Constructor and Description|
The constructor of
|Modifier and Type||Method and Description|
This method needs to be provided by an implementation of
public WeakInvalidationListener(InvalidationListener listener)
listener- The original listener that should be notified
public boolean wasGarbageCollected()
trueif the linked listener was garbage-collected. In this case, the listener can be removed from the observable.
public void invalidated(Observable observable)
InvalidationListener. It is called if an
In general is is considered bad practice to modify the observed value in this method.
Copyright (c) 2008, 2014, Oracle and/or its affiliates. All rights reserved.