You can use the class as the "source" for the event ( EventBus#addHandlerToSource<http://google-web-toolkit.googlecode.com/svn/javadoc/2.2/com/google/gwt/event/shared/EventBus.html#addHandlerToSource(com.google.gwt.event.shared.GwtEvent.Type, java.lang.Object, H)> and EventBus#fireEventFromSource<http://google-web-toolkit.googlecode.com/svn/javadoc/2.2/com/google/gwt/event/shared/EventBus.html#fireEventFromSource(com.google.gwt.event.shared.GwtEvent, java.lang.Object)>). This is what RequestFactory uses for instance: it has a single EntityProxyChange event and you register with a Class<? extends EntityProxy> to be notified only when the event is about that particular kind of objects.
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