code: @Override
  	public void servletEvent(final ServletEvent event) {
  		if (LOG.isDebugEnabled()) {
  			LOG.debug("Sending web event " + event + " for bundle "
  					+ event.getBundleName());
  		}
  		synchronized (listeners) {
  			callListeners(event);
  			Map<String, ServletEvent> events = states.get(event.getBundleId());
  			if (events == null) {
  				events = new LinkedHashMap<>();
  				states.put(event.getBundleId(), events);
  			}
  			events.put(event.getAlias(), event);
  		}
  	}
docs: /*
  (non-Javadoc)
  
  @see
  org.ops4j.pax.web.service.spi.ServletListener#servletEvent(org.ops4j.
  pax.web.service.spi.ServletEvent)