How can I merge the response from an external service call with the original message in camel

Question

From a logical perspective this is the kind of routing behaviour I wish to implement:

I want to be able to merge the response of an external service with the original request.

I have been able to implement this using multicasting, an aggregator, and a mock endpoint but I was wondering if there is a cleaner way. My current implementation looks like this:

        <multicast strategyRef="serviceAggregator" stopOnException="false">
            <to uri="mock:foo" />
            <to uri="http://0.0.0.0:9999/service/?throwExceptionOnFailure=false" />
        </multicast>
        <camel:to uri="log:uk.co.company.aggregated?showAll=true" />
        <to uri="http://0.0.0.0:9999/anotherService/ 

The part I particularly don't like is using a mock endpoint but I also don't think that this is a very readable way to express the above diagram. So I was wondering if there was a more elegant way of doing this?

Answer 1

I suggest to read about the EIP patterns, for example the content enricher http://camel.apache.org/content-enricher.html

Where you can merge the reply message with the request message.

Mind the Content Enricher has 2 modes - enrich - pollEnrich

Make sure to notice the difference, from the docs in the link above.

<route>
  <from uri="...">
  <enrich uri="http://0.0.0.0:9999/service/?throwExceptionOnFailure=false" strategyRef="serviceAggregator"/>
  <to uri="log:uk.co.company.aggregated?showAll=true" />
  <to uri="http://0.0.0.0:9999/anotherService/>
  ...
</route>

And yes you diagram is showing splitter, but the sample code is using multicast EIP.