org.apache.tapestry.event
Interface ChangeObserver

All Known Subinterfaces:

IPageRecorder

All Known Implementing Classes:

PageRecorderImpl

public interface ChangeObserver

May observe changes in an object's properties. This is a "weak" variation on JavaBean's style bound properties. It is used when there will be at most a single listener on property changes, and that the listener is not interested in the old value.

Author:

Howard Lewis Ship

Method Summary

boolean	isLocked() Checks if the current state changes have already been committed.
void	observeChange(ObservedChangeEvent event) Sent when the observed object changes a property.

Method Detail

observeChange

void observeChange(ObservedChangeEvent event)

Sent when the observed object changes a property. The event identifies the object, the property and the new value.

isLocked

boolean isLocked()

Checks if the current state changes have already been committed.

Returns:

True if state changes are locked, false otherwise.