public void fire(
DependentSubjectListener subject, Integer event, DependentSubjectListener listener) {
// update the listener
boolean incremented = listener.latestRevision < event.intValue();
listener.latestRevision = event.intValue();
// make sure the listener's dependencies were notified first
listener.assertDependenciesSatisfiedRecursively(listener);
// send the event forward
if (incremented) {
listener.increment(0);
}
}
/** Register the listener as dependent on the subject. */
public void addListener(DependentSubjectListener listener) {
downstreamListeners.add(listener);
listener.upstreamSubjects.add(this);
listener.latestRevision = Math.max(listener.latestRevision, latestRevision);
this.publisher.addListener(this, listener, DependentSubjectListenerEventFormat.INSTANCE);
}