Blair, see this JIRA for a similar discussion on this...
https://issues.apache.org/jira/browse/CAMEL-4226
Blair wrote:
>
> Hi all, I'd like to add expressions to .to in the DSL... this is why....
>
> My code is littered with
>
> .recipientList(constant("activemq:receiving:").append(header("app"))
>
> Because I am wanting to send the message to an endpoint that we define in
> an expression. (mostly queues)
> however... it is a single endpoint, and will only ever be a single
> endpoint... I would greatly prefer to be able to use
>
> .to(constant("activemq:receiving:").append(header("app"))
>
> just for clarity if nothing else
>
> The other thing with using .recipientList(Expression) is that you can't
> use it in a where clause if you are going to continue with the clause....
> since it returns RecipientListDefinition<Type> where to be in a choice
> statement requires a ChoiceDefinition...
>
> so we end up with code that looks like...
>
> ... beginning of route here....
> .choice()
> .when(header("statusId").isNotEqualTo(""))
> .to("direct:receipting")
> .otherwise()
> .to("direct:receiving")
> .end();
>
>
> from("direct:receipting").routeId("receiptingRestService").recipientList(constant("activemq:receipting:").append(header("app")));
> // queue for each app so one customer service can't interfere with
> another...
>
> from("direct:receiving").routeId("receivingRestService").recipientList(constant("activemq:receiving:").append(header("app")));
> // queue for each app so one customer service can't interfere with
> another...
>
>
>
> where what I would like to say is....
> .when(header("statusId").isNotEqualTo("")) // we have a
> receipt...
>
> .to(constant("activemq:receipting:").append(header("app")))
> .otherwise() // it must be a message to be passed back...
>
> .to(constant("activemq:receiving:").append(header("app")))
> .end();
>
> I'm happy to make the changes and submit a patch if that helps :)
>
-----
Ben O'Day
IT Consultant -http://consulting-notes.com
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