if(registrationId == null){
throw new NullPointerException("registrationId can't be null");
}
EventService eventService = nodeEngine.getEventService();
return eventService.deregisterListener(SERVICE_NAME, SERVICE_NAME, registrationId);
}
@edu.umd.cs.findbugs.annotations.SuppressWarnings("BC_UNCONFIRMED_CAST")
@Override
public void dispatchEvent(MembershipEvent event, MembershipListener listener) {