Question

I want to set the endpoint specific header value in Multicast component.

XML DSL as below:

<route>

<from uri="direct:testRoute"/>
<multicast strategyRef="MyAggregator" parallelProcessing="true">
<to uri="direct:call1"/> <!-- set the header MY_HEADER = "call_1" -->
<to uri="direct:call2/> <!-- set the header MY_HEADER = "call_2" -->
</multicast>

</route>

Basically in the response aggregation I want to know, to which service request this response belongs to.

I tried by doing this, but its not the correct way (parse exception):

<to uri="direct:call1"> 
      <setHeader headerName="MY_HEADER"><simple>call1</simple></setHeader>
 </to>

What I see from reading the documentation is that, multicast will copy the source Exchange and multicast each copy. So its a shallow copy of the Exchange and kind of reference shared between all the multicast recipient.

But here I am looking for specific header value for individual recipient.

How to do this? Any pointers?

Answer 1

There is a header with the key Exchange.TO_ENDPOINT that you can see which of the 2 endpoints the response is from.