org.bushe.swing.event
Interface VetoTopicEventListener<T>

All Known Implementing Classes:

ProxyTopicPatternSubscriber, ProxyTopicSubscriber

public interface VetoTopicEventListener<T>

Interface for classes that can veto publication on topic names from the EventService.

Method Summary

boolean

shouldVeto(java.lang.String topic, T data) Determine whether a topic publication should be vetoed or allowed.

Method Detail

shouldVeto

boolean shouldVeto(java.lang.String topic,
                   T data)

Determine whether a topic publication should be vetoed or allowed.

The EventService calls this method before publication of on a topic name. If any of the VetoTopicEventListeners return true, then none of the subscribers to that topic are called.

Prerequisite: VetoTopicEventListener has to be subscribed with the EventService for the topic name.

Guaranteed to be called in the SwingEventThread when using the SwingEventService (EventBus). See EventService

Parameters:

topic - The topic name the data object is published on.

data - The data object being published on the topic.

Returns:

true if the publication on the topic should be vetoed and not published, false if the data should be published on the topic.