One-way route waiting on a request-response endpoint

Assume that you have a route that uses the InOnly Message Exchange Pattern (MEP). The consumer that fed a message into the route expects no response. Any endpoint listed in the route will, as a consequence, be invoked with the InOnly MEP.

This recipe shows how you can alter the MEP temporarily to InOut in order to request a response from an endpoint used in a one-way route.

Getting ready

The Java code for this recipe is located in the org.camelcookbook.routing.changingmep package. The Spring XML files are located under src/main/resources/META-INF/spring and prefixed with changingMep.

How to do it...

Use the inOut DSL statement to explicitly route a message to that endpoint with that specific MEP.

In the XML DSL, this logic is written as follows:

<route>
  <from uri="direct:in"/>
  <inOut uri="direct:modifyMessage"/>
  <to uri="mock:afterMessageModified"/>
</route>

Tip

The Endpoint invocation could also be written as...