org.jboss.dna.graph.observe
Interface Observable

All Known Implementing Classes:

ChangeObservers, RepositoryLibrary

@ThreadSafe
public interface Observable

Interface used to register listeners. Implementations should use a ChangeObservers to actually manage the listeners.

Method Summary

boolean	register(ChangeObserver observer) Register the supplied observer.
boolean	unregister(ChangeObserver observer) Unregister the supplied observer.

Method Detail

register

boolean register(ChangeObserver observer)

Register the supplied observer. This method does nothing if the observer reference is null.

Parameters:

observer - the observer to be added; may be null

Returns:

true if the observer was added, or false if the observer was null, if the observer was already registered, or if the observer could not be added

unregister

boolean unregister(ChangeObserver observer)

Unregister the supplied observer. This method does nothing if the observer reference is null.

Parameters:

observer - the observer to be removed; may not be null

Returns:

true if the observer was removed, or false if the observer was null or if the observer was not registered on this source