public synchronized void unregisterListener(EventListener listener) {
Iterator<EventSender> i = eventSenders.iterator();
while (i.hasNext()) {
EventSender sender = i.next();
sender.unregisterListener(listener);
if (sender.getListeners().isEmpty()) i.remove();
}
}
public synchronized List<EventListener> getListeners(Class<? extends Event> eventClass) {
for (EventSender sender : eventSenders)
if (eventClass.isAssignableFrom(sender.getListenerEventClass())) return sender.getListeners();
return Collections.emptyList();
}