Re: Best Way to Start out with ServiceMix

[Jason Vinson]

I found a way to do this that i think is correct.  The following is  
what i came up with (parts borrowed from ScriptComponent):

        public void onMessageExchange(MessageExchange exchange)
                        throws MessagingException {
                NormalizedMessage in = exchange.getMessage("in");
                Object payload = getBody(in);
                
                // do something with it...
                processPayload(payload);
                
                if (isInAndOut(exchange)) {
                        NormalizedMessage out = exchange.createMessage();
                        exchange.setMessage(out, "out");
                } else {
                        InOnly outExchange = 
getExchangeFactory().createInOnlyExchange();
                        NormalizedMessage out = outExchange.createMessage();
                        setBody(out, payload);
                        outExchange.setInMessage(out);
                        getDeliveryChannel().sendSync(outExchange);
                }
                done(exchange);
        }
        
I see that this seems to work fine, but I'd like to know if this is  
correct.  One thing that bothers me is that i have to do "sendSync"  
but I think i want to just send.  When I do that i get the following:

SEVERE: [EMAIL PROTECTED] Gor error  
processing [EMAIL PROTECTED]
javax.jbi.messaging.MessagingException: illegal call to send

Thanks,
Jason

On Mar 20, 2006, at 10:37 AM, Jason Vinson wrote:

Hi,

I'm very new to servicemix, but I have a question about what is the  
best approach to start writing "service engines" to use in a  
servicemix esb.  My first thought is to write a class that extends  
PojoSupport and implements MessageExchangeListener, but I wanted to  
find out from the experts if this is the desired implementation.

I've also been drawn towards the TransformComponentSupport class,  
which I suppose could be used to plug in a service as well, but the  
name implies that it's to be used for transformation, not service  
execution.  Could I get some info regarding this, or at least  
pointers to a clear tutorial on this concept?

Thanks so much,
Jason