CODEWITHSUNDEEP
apache-camel
opstalj
opstalj

Reputation: 900

Apache Camel: can I put multiple statements in the when part of the conditional choice statement?

I would like to obtain the following kind of routing:

  1. HTTP POST message with XML body enters CAMEL
  2. I store some of the parameters of the XML body
  3. The message is routed to an external endpoint
  4. The external endpoint (external server) replies

-> at this moment, I would like to check whether the reply from the external endpoint is a HTTP 200 OK containing a XML parameter equal to SUCCESS. -> if so, then I would like to use some of the stored parameters to construct a new HTTP message (method = PUT this time) and send it out to an external endpoint

Problem that I am currently having, is the following:

.choice()
 .when(simple("${in.headers.CamelHttpResponseCode} == 200"))
   // now I want do a few things, eg: check also the XML body via xpath
   // and change the message to be sent out (change Method to PUT, ...)
    .to("http://myserver.com")
 .otherwise()
   // if no 200 OK, I want the route to be stopped ... not sure how ?
.end()

Question: any idea how to add those extra statements in case the HTTP response code was 200 OK ? It looks like the when does not allow me to add extra statements ... (I got an error in my Eclipse IDE).

Thanks in advance.

Note: could it be that I have to route the message in case the 200 OK matches to a 'new endpoint' and then create a new from route with this new endpoint ? Eg:

.choice()
     .when(simple("${in.headers.CamelHttpResponseCode} == 200"))
        .to("mynewendpoint")
     .otherwise()
       // if no 200 OK, I want the route to be stopped ... not sure how ?
    .end();

 from("mynewendpoint").
  .setHeader(etc etc)
  .to("http://myserver.com")

In this latter case, how exactly should I define this 'newendpoint' ?

Upvotes: 10

Views: 26546

Answers (2)

Ben ODay
Ben ODay

Reputation: 21015

yep, you can have multiple statements between the .when() and .otherwise() and you can always call .endChoice() to explicitly end each conditional block...

to your other question, you can use camel-direct to chain together multiple routes, etc...

Upvotes: 4

Claus Ibsen
Claus Ibsen

Reputation: 55555

In the programming language DSLs such as Java, you can build predicates together. I posted a blog entry some years ago about this at: http://davsclaus.blogspot.com/2009/02/apache-camel-and-using-compound.html

For example having two predicates

Predicate p1 = header("hl7.msh.messageType").isEqualTo("ORM"):
Predicate p2 = header("hl7.msh.triggerEvent").isEqualTo("001");

You can chain them together, using and or or.

Predicate isOrm = PredicateBuilder.and(p1, p2);

And then you can use isOrm in the route

from("hl7listener")
    .unmarshal(hl7format)
    .choice()
        .when(isOrm).beanRef("hl7handler", "handleORM")
        .otherwise().beanRef("hl7handler", "badMessage")
    .end()
    .marshal(hl7format);

Upvotes: 26

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