11.13. Configuration for Content-Based Routing

  • XPath statements are connected through configuration settings stored in the jboss-esb.xml file. The service configuration below shows an example service configuration fragment. (In this example, the service is listening to a Java Message Service queue.) 
    <service> 
        	category="MessageRouting" 
        	name="YourServiceName" 
        	description="CBR Service">
        	<listeners>        
                  <jms-listener name="CBR-Listener"                  
                            busidref="QueueA" maxThreads="1">             
	           </jms-listener>
               </listeners>
		<actions> 
		     <action class="org.jboss.soa.esb.actions.ContentBasedRouter" 
		     				     name="YourActionName">
                    	<property name="ruleSet" value="JBossESBRules.drl"/>
                    	<property name="ruleReload" value="true"/>
                    	<property name="destinations">
                           <route-to destination-name="xml-destination" 
				    service-category="category01" 
			           service-name="jbossesbtest1" /> 
                           <route-to destination-name="serialized-destination"
                            				           service-category="category02" 
				    service-name="jbossesbtest2" /> 
                    	</property> 
                    	<property name="object-paths">
				<object-path esb="body.test1" /> 
				<object-path esb="body.test2" /> 
		     	</property>
                    </action>
		</actions>
            </service>
    Each message is passed to the ContentBasedRouter action class, which is loaded with a certain rule-set. It then sends the message to the JBoss Rules engine's working memory, runs the rules, obtains the list of destinations and sends copies of the message to the services.
    In this case, it uses the JBossESBRules.drl rule-set which matches two destinations- xml-destination and serialized-destination . These names are mapped to those of real services in the route-to section.