code: public void serviceActive(ReceivableService receivableService) {
  		for (ReceivableEvent receivableEvent : receivableService.getReceivableEvents()) {
  			Set<ServiceID> servicesReceivingEvent = eventID2serviceIDs.get(receivableEvent.getEventType());
  			if (servicesReceivingEvent == null) {
  				servicesReceivingEvent = new HashSet<ServiceID>();
  				Set<ServiceID> anotherSet = eventID2serviceIDs.putIfAbsent(receivableEvent.getEventType(), servicesReceivingEvent);
  				if (anotherSet != null) {
  					servicesReceivingEvent = anotherSet;
  				}
  			}
  			synchronized (servicesReceivingEvent) {
  				servicesReceivingEvent.add(receivableService.getService());
  			}
  		}		
  	}
docs: Informs the filter that a receivable service is now active.
  For the events related with the service, and if there are no other
  services bound, then events of such event type should now not be filtered.
  
  @param receivableService