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<route>
  <from uri="direct:start"/>
    <choice>
      <when>
        <method bean="controlBean" method="isDetour"/>
	<to uri="mock:detour"/>
      </when>
    </choice>
    <to uri="mock:result"/>
  </split>
</route>

whether the detour is turned on or off is decided by the ControlBean. So, when the detour is on the message is routed to mock:detour and then mock:result. When the detour is off, the message is routed to mock:result.

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camel-core/src/test/java/org/apache/camel/processor/DetourTest.java