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11.13. JMS Routing

JMS Routing

JMS routing is performed via the jms:router configuration from the http://www.milyn.org/xsd/smooks/jms-routing-1.2.xsd configuration namespace. The following is an example jms:router configuration that routes an orderItem_xml bean to a JMS Queue named smooks.exampleQueue: 

<?xml version="1.0"?>
<smooks-resource-list xmlns="http://www.milyn.org/xsd/smooks-1.1.xsd"
                      xmlns:core="http://www.milyn.org/xsd/smooks/smooks-core-1.3.xsd"
                      xmlns:jms="http://www.milyn.org/xsd/smooks/jms-routing-1.2.xsd"
                      xmlns:ftl="http://www.milyn.org/xsd/smooks/freemarker-1.1.xsd">
 
        <!--
        Filter the message using the SAX Filter (i.e. not DOM, so no
        intermediate DOM, so we can process huge messages...
        -->
        <core:filterSettings type="SAX" />
 
(1)     <resource-config selector="order,order-item">
            <resource>org.milyn.delivery.DomModelCreator</resource>
        </resource-config>
 
(2)     <jms:router routeOnElement="order-item" beanId="orderItem_xml" destination="smooks.exampleQueue">
            <jms:message>
                <!-- Need to use special FreeMarker variable ".vars" -->
                <jms:correlationIdPattern>${order.@id}-${.vars["order-item"].@id}</jms:correlationIdPattern>
            </jms:message>
            <jms:highWaterMark mark="3"/>
        </jms:router>
 
(3)     <ftl:freemarker applyOnElement="order-item">
            <!--
            Note in the template that we need to use the special FreeMarker variable ".vars"
            because of the hyphenated variable names ("order-item"). See http://freemarker.org/docs/ref_specvar.html.
            -->
            <ftl:template>/orderitem-split.ftl</ftl:template>
            <ftl:use>
                <!-- Bind the templating result into the bean context, from where
                it can be accessed by the JMSRouter (configured above). -->
                <ftl:bindTo id="orderItem_xml"/>
            </ftl:use>
        </ftl:freemarker>
 
</smooks-resource-list>
In this case, we route the result of a FreeMarker templating operation to the JMS Queue (that is, as a String). We could also have routed a full Object Model, in which case it would be routed as a Serialized ObjectMessage.