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Posted to users@camel.apache.org by wanggang1 <wa...@gmail.com> on 2012/02/04 19:00:40 UTC

Camel Request-Reply pattern

Hi,

I'm new with Camel.  I have tried to search the web for an answer but could
not come up with one.  Here is my question.  I need to route a http request
to a Web Service.  The http request is in existing application so I could
not change its nature(i.e. async).  My thinking is that I need to use
Request-Reply pattern and transform XML to SOAP then SOAP to XML on its way
back.

First, is these the correct approach?
Second,the request-reply sample shown in Camel document has the response
from Replier going directly to Requester.  Can I add a transformer in
between?

Please help, and it'll be great if you could add a routing sample code.

Thanks

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Re: Camel Request-Reply pattern

Posted by wanggang1 <wa...@gmail.com>.

Thanks to both Claus  and Chris for your timely reply!

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Re: Camel Request-Reply pattern

Posted by wanggang1 <wa...@gmail.com>.

Hi Claus,

Could you explain a little further?  I have something like following, but
after I process the return the response is not returned to the producer even
with setting ExchangePattern to InOut.  Thanks!

from("jetty:http://localhost:8888/stockquote?matchOnUriPrefix=true")
    .streamCaching()
    .process(new Processor() {
          @Override
          public void process(final Exchange exchange) throws Exception {
               ........
          }
    })
  
.to("http://www.webservicex.net/stockquote.asmx?bridgeEndpoint=true&throwExcpetionOnFailure=false")
   .process(new Processor() {
         @Override
         public void process(final Exchange exchange) throws Exception {
              .........
              exchange.setPattern(ExchangePattern.InOut);
         }
   });

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Re: Camel Request-Reply pattern

Posted by Claus Ibsen <cl...@gmail.com>.

On Sat, Feb 4, 2012 at 7:00 PM, wanggang1 <wa...@gmail.com> wrote:
> Hi,
>
> I'm new with Camel.  I have tried to search the web for an answer but could
> not come up with one.  Here is my question.  I need to route a http request
> to a Web Service.  The http request is in existing application so I could
> not change its nature(i.e. async).  My thinking is that I need to use
> Request-Reply pattern and transform XML to SOAP then SOAP to XML on its way
> back.
>
> First, is these the correct approach?
> Second,the request-reply sample shown in Camel document has the response
> from Replier going directly to Requester.  Can I add a transformer in
> between?
>

Yes that is possible.

from HTTP
  transform
  to WS
  transform (*)

When the route ends at (*) then that's the reply going back to the
requester (http client).

There are many ways in Camel you can transform a message.
You can send messages to an endpoint, eg a XSTL endpoint, you can use
a Java bean, etc.

Its the Message Translator EIP
http://camel.apache.org/message-translator.html



> Please help, and it'll be great if you could add a routing sample code.
>
> Thanks
>
> --
> View this message in context: http://camel.465427.n5.nabble.com/Camel-Request-Reply-pattern-tp5456573p5456573.html
> Sent from the Camel - Users mailing list archive at Nabble.com.



-- 
Claus Ibsen
-----------------
FuseSource
Email: cibsen@fusesource.com
Web: http://fusesource.com
Twitter: davsclaus, fusenews
Blog: http://davsclaus.blogspot.com/
Author of Camel in Action: http://www.manning.com/ibsen/

Re: Camel Request-Reply pattern

Posted by Christian Schneider <ch...@die-schneider.net>.

The descriptions on this page may help you. They describe the request 
reply pattern when using several processors and also
how the reply goes back to the from.

http://camel.apache.org/using-getin-or-getout-methods-on-exchange.html

To make it short you can use a transform easily. The camel-cxf component 
can do the xml to soap and vice a versa for you.
Use the payload mode to achieve that.

Christian

Am 04.02.2012 19:00, schrieb wanggang1:
> Hi,
>
> I'm new with Camel.  I have tried to search the web for an answer but could
> not come up with one.  Here is my question.  I need to route a http request
> to a Web Service.  The http request is in existing application so I could
> not change its nature(i.e. async).  My thinking is that I need to use
> Request-Reply pattern and transform XML to SOAP then SOAP to XML on its way
> back.
>
> First, is these the correct approach?
> Second,the request-reply sample shown in Camel document has the response
> from Replier going directly to Requester.  Can I add a transformer in
> between?
>
> Please help, and it'll be great if you could add a routing sample code.
>
> Thanks
>
> --
> View this message in context: http://camel.465427.n5.nabble.com/Camel-Request-Reply-pattern-tp5456573p5456573.html
> Sent from the Camel - Users mailing list archive at Nabble.com.


-- 

Christian Schneider
http://www.liquid-reality.de

Open Source Architect
Talend Application Integration Division http://www.talend.com