public interface VetoableSubject extends Subject
VetoableSubject
interface defines the API to register observers
interested in receiving notifications of pending subject changes.Modifier and Type | Method and Description |
---|---|
void |
notifyVetoObservers(java.lang.Object subject,
UpdateMessage change)
Notifies all observers that the state of the subject has changed.
|
attach, detach, notifyObservers
void notifyVetoObservers(java.lang.Object subject, UpdateMessage change) throws ChangeVetoException
subject
- the subject whose state has changed.change
- what changed.ChangeVetoException
- if any VetoObserver rejected the
pending change.