The Smooks Mediator can be used to apply lightweight transformations on messages in an efficient manner. Smooks is a powerful framework for processing, manipulating and transforming XML. More information about Smooks can be obtained from the official Smooks website.
The Smooks Mediator requires the transformation definition to be passed in as an external resource. This transformation can be specified as a local entry or be stored in the registry. The mediator UI enables you to point the mediator to an existing local entry or a registry resource.
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| language | xml |
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| title | Sample Smooks configuration |
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<?xml version="1.0" encoding="UTF-8"?>
<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:ftl="http://www.milyn.org/xsd/smooks/freemarker-1.1.xsd" xmlns:jms="http://www.milyn.org/xsd/smooks/jms-routing-1.2.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" />
<!-- Capture the message data 2 seperate DOM model, for "order" and "order-item" fragments... -->
<resource-config selector="order,order-item">
<resource>org.milyn.delivery.DomModelCreator</resource>
</resource-config>
<!-- At each "order-iteam", apply a template to the "order" and "order-item" DOM model... -->
<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>/repository/resources/orderitem-split.ftl.txt</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>
<!-- At each "order-item", route the "orderItem_xml" to the ActiveMQ JMS Queue... -->
<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:jndi properties="/repository/conf/jndi.properties" />
<jms:highWaterMark mark="-1" />
</jms:router>
</smooks-resource-list>
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Example 2: Referring files from the Smooks configuration
The following Smooks configuration refers a bindings file named mapping.xml. This file should be saved in <ESB_HOME>/TESTDev directory in order to be accessed via the class path. These bindings will be applied during mediation when the Smooks configuration is included in a Smooks mediator configuration via the Registry.
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<smooks-resource-list xmlns="http://www.milyn.org/xsd/smooks-1.0.xsd">
<resource-config selector="org.xml.sax.driver">
<resource>org.milyn.smooks.edi.EDIReader</resource>
<param name="mapping-model">TESTDev/smooks/mapping.xml</param>
</resource-config>
</smooks-resource-list> |
Samples
Sample 654: Smooks Mediator.