code: protected Collection loadEvenHandler(String topic) {
  		Collection ehs = new ArrayList();
  		Collection<String> consumers = (Collection<String>) containerWrapper.lookup(ConsumerLoader.TOPICNAME + topic);
  		if (consumers == null || consumers.size() == 0) {
  			Debug.logWarning("[Jdonframework]there is no any consumer class annotated with @Consumer(" + topic + ") ", module);
  			return ehs;
  		}
  		for (String consumerName : consumers) {
  			DomainEventHandler eh = (DomainEventHandler) containerWrapper.lookup(consumerName);
  			ehs.add(eh);
  		}
  
  		return ehs;
  
  	}
docs: if there are many consumers, execution order will be alphabetical list by
  Name of @Consumer class.
  
  @param topic
  @return