2.7. Advanced MessageBroker Customization

The initialization of the MessageBroker by the MessageBrokerFactoryBean logically consists of two phases:

  1. Parsing the BlazeDS XML configuration files and applying their settings to a newly created MessageBroker

  2. Starting the MessageBroker and its services

A special MessageBrokerConfigProcessor callback interface is provided that allows custom processing to be done on the newly created MessageBroker after each phase, before it is made available for request processing. This interface is used internally by Spring BlazeDS Integration, but is also available for general use in advanced programmatic introspection and customization of the MessageBroker. A custom MessageBrokerConfigProcessor can be configured as a Spring bean and then registered with the MessageBrokerFactoryBean via the config-processor tag. For example, given a trivial implementation to log some additional info about the MessageBroker:

package com.example;

import org.springframework.flex.config.MessageBrokerConfigProcessor;

import flex.messaging.MessageBroker;
import flex.messaging.services.RemotingService;

public class MyDestinationCountingConfigProcessor implements MessageBrokerConfigProcessor {

	public MessageBroker processAfterStartup(MessageBroker broker) {
		RemotingService remotingService = 
			(RemotingService) broker.getServiceByType(RemotingService.class.getName());
		if (remotingService.isStarted()) {
			System.out.println("The Remoting Service has been started with "
					+remotingService.getDestinations().size()+" Destinations.");
		return broker;

	public MessageBroker processBeforeStartup(MessageBroker broker) {
		return broker;

This class could be configured and registered with the MessageBroker as follows:

	<flex:config-processor ref="myConfigProcessor" />

<bean id="myConfigProcessor" class="com.example.MyDestinationCountingConfigProcessor" />