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Content Enricher

Overview

The content enricher pattern describes a scenario where the message destination requires more data than is present in the original message. In this case, you would use a content enricher to pull in the extra data from an external resource.

Figure 6.1. Content Enricher Pattern

Content enricher pattern

Implementing a content enricher

You can use one of the following approaches to implement a content enricher:

Java DSL example

You can use templating to consume a message from one destination, transform it with a scripting language, like Velocity or XQuery, and then send it on to another destination. For example, using the InOnly exchange pattern (one way messaging):

from("activemq:My.Queue").
  to("velocity:com/acme/MyResponse.vm").
  to("activemq:Another.Queue");

If you want to use InOut (request-reply) semantics to process requests on the My.Queue queue in ActiveMQ with a template-generated response and then send responses back to the JMSReplyTo destination, you could define a route like the following: 

from("activemq:My.Queue").
  to("velocity:com/acme/MyResponse.vm");

For more details about the Velocity component, see ????.

XML configuration example

The following example shows how to configure the same route in XML:

<camelContext xmlns="http://activemq.apache.org/camel/schema/spring">
  <route>
    <from uri="activemq:My.Queue"/>
    <to uri="velocity:com/acme/MyResponse.vm"/>
    <to uri="activemq:Another.Queue"/>
  </route>
</camelContext>
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