code: private void notifyHandler(ZoneHandlerClass handler, ApiZone apiZone, Object userAgent) {
          Object instance = handler.newInstance();
          callHandleMethod(handler.getHandleMethod(), instance, apiZone, userAgent);
      }
docs: Propagate event to handler
  
  @param handler
  structure of handler class
  @param apiZone
  api zone reference
  @param userAgent
  user agent reference