Content-Based Router

Overview

A content-based router enables you to route messages to the appropriate destination, where the routing decision is based on the message contents. This pattern maps to the corresponding content-based router pattern in FUSE Mediation Router.

Figure A.1. Content-Based Router Pattern

Example ServiceMix EIP route

The following example shows how to define a content-based router using the ServicMix EIP component. Incoming messages are routed to the http://test/pipeline/endpoint endpoint, if a test:echo element is present in the message body, and to the test:recipients endpoint, otherwise:

<eip:content-based-router service="test:router" endpoint="endpoint">
  <eip:rules>
    <eip:routing-rule>
      <eip:predicate>
        <eip:xpath-predicate xpath="count(/test:echo) = 1" namespaceContext="#nsContext" />
      </eip:predicate>
      <eip:target>
        <eip:exchange-target uri="endpoint:test:pipeline:endpoint" />
      </eip:target>
    </eip:routing-rule>
    <eip:routing-rule>
      <!-- There is no predicate, so this is the default destination -->
      <eip:target>
        <eip:exchange-target service="test:recipients" />
      </eip:target>
    </eip:routing-rule>
  </eip:rules>
</eip:content-based-router>

Equivalent FUSE Mediation Router XML route

The following example shows how to define an equivalent route using FUSE Mediation Router XML configuration:

<route>
  <from uri="jbi:endpoint:http://progress.com/demos/test/router/endpoint"/>
  <choice>
    <when>
      <xpath>count(/test:echo) = 1</xpath>
      <to uri="jbi:endpoint:http://progress.com/demos/test/pipeline/endpoint"/>
    </when>
    <otherwise>
      <!-- This is the default destination -->
      <to uri="jbi:service:http://progress.com/demos/test/recipients"/>
    </otherwise>
  </choice>
</route>

Equivalent FUSE Mediation Router Java DSL route

The following example shows how to define an equivalent route using the FUSE Mediation Router Java DSL:

from("jbi:endpoint:http://progress.com/demos/test/router/endpoint").
    choice().when(xpath("count(/test:echo) = 1")).to("jbi:endpoint:http://progress.com/demos/test/pipeline/endpoint").
    otherwise().to("jbi:service:http://progress.com/demos/test/recipients");