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Chapter 10. System Management

Abstract

The system management patterns describe how to monitor, test, and administer a messaging system.

10.1. Detour
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Detour
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The Detour from the Introducing Enterprise Integration Patterns allows you to send messages through additional steps if a control condition is met. It can be useful for turning on extra validation, testing, debugging code when needed.
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Example
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In this example we essentially have a route like from("direct:start").to("mock:result") with a conditional detour to the mock:detour endpoint in the middle of the route.. 
from("direct:start").choice()
    .when().method("controlBean", "isDetour").to("mock:detour").end()
    .to("mock:result");
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Using the Spring XML Extensions 
<route>
  <from uri="direct:start"/>
    <choice>
      <when>
        <method bean="controlBean" method="isDetour"/>
	<to uri="mock:detour"/>
      </when>
    </choice>
    <to uri="mock:result"/>
  </split>
</route>
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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.
For full details, check the example source here:
camel-core/src/test/java/org/apache/camel/processor/DetourTest.java
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