public interface VetoObserver
VetoObserver
interface defines the notification API through which interested observers are notified of pending subject changes. VetoObserver
s can the indicate that they do not accept the pending change.UpdateMessage
, VetoableSubject
Modifier and Type | Method and Description |
---|---|
void |
vetoableUpdate(java.lang.Object observed, UpdateMessage change)
Notification message.
|
void vetoableUpdate(java.lang.Object observed, UpdateMessage change) throws ChangeVetoException
observed
- the subject whose state has changed.change
- what has changed.ChangeVetoException
- if the pending update is rejected by the vetoableUpdate implementation.