On 07/04/2008, greenbean <[EMAIL PROTECTED]> wrote:
>
> Newbie alert: I am looking at Camel as a method to add better
> workflow/routing behaviors to a system that uses Spring, ActiveMQ, and
> Jencks to have POJOs consume and send JMS messages.
>
> I read that a bean cannot be used as input.
It can be polled though.
from("bean:foo").to("activemq:cheese");
will poll the foo bean and then send its response to the cheese queue
> However, I am wondering why the
> return from a bean method cannot be sent to a destination? It would be nice
> to have Camel call a bean method based on the contents of a message from a
> JMS queue.
Oh it can do that...
from("activemq:someQueueName").bean("someBeanName");
using the message body to determine the method to invoke. Or you can
be specific...
from("activemq:someQueueName").bean("someBeanName", "someMethodName");
for more detail see...
http://activemq.apache.org/camel/bean-integration.html
> It would also be nice to have the response from the method get
> send to another queue based on some configuration without having to
> explicity use a Template send method.
If the JMS message sent to the queue has a JMSReplyTo header then this
works now in 1.3.0...
from("activemq:someQueueName").bean("someBeanName", "someMethodName");
the response from the "someMethodName" method on someBeanName bean
will be returned to the JMSReplyTo queue.
If thats not good enough, you can explicitly specify the
queue/endpoint to send the response to.
from("activemq:someQueueName").bean("someBeanName", "someMethodName")
.to("activemq:MyResponseQueue");
> It would also be nice to be able to
> route to a queue based on the contents of the response and route to a
> different location if the an exception is thrown instead of a normal
> response (and route based on the exception thrown).
Again you can use the content based router to do that...
from("activemq:someQueueName").bean("someBeanName", "someMethodName")
.choice().
....
see http://activemq.apache.org/camel/content-based-router.html
> Is there anything in Camel that allows this currently? I suppose I could
> write a proxy to wrap around beans and send JMS messages based on method
> returns. However, it would be great if Camel already did this and had the
> routing logic to allow a basic type of workflow across JMS queues.
BTW there's also the Spring Remoting which does the proxy thing you
suggest; allowing you to invoke a proxy for any Java interface/base
class and underneath the covers do JMS messaging.
http://activemq.apache.org/camel/spring-remoting.html
--
James
-------
http://macstrac.blogspot.com/
Open Source Integration
http://open.iona.com
