How to map sync EJB call to async JMS req/resp pair

Folks,
Basically, we have the situation our session bean synchronous
transactions map to asynchronous JMS transactions.
In other words, a session bean method call would have the
following implementation logic:
1. marshall params and send async JMS message.
2. wait around for a reply message to be ready
3. receive a reply JMS message, unmarshall response.
4. return.
The problem, clearly, is that we can't do step 2 in the EJB method itself for fear
of tying up threads.
This seems like a classic problem of mapping synchronous EJB calls to asynchronous
backends.
Any suggestions how to do this?
Thanks,
Jabir

I don't know if there are any great solutions, short of making everything
async
(even to the EJB client) which should be considered if possible. E.g., EJB
sends
JMS message and immediately returns. Then an MDB gets the JMS response,
and calls back the client. If you can't modify the client, maybe you can
write a
"proxy" service between the client and the EJB layer.
Otherwise you'll need to bump the number of threads, knowing that a certain
amount of them will be sleeping.
regards,
-Ade
"Jabir" <[email protected]> wrote in message
news:3d2d14aa$[email protected]..
>
Folks,
Basically, we have the situation our session bean synchronous
transactions map to asynchronous JMS transactions.
In other words, a session bean method call would have the
following implementation logic:
1. marshall params and send async JMS message.
2. wait around for a reply message to be ready
3. receive a reply JMS message, unmarshall response.
4. return.
The problem, clearly, is that we can't do step 2 in the EJB method itselffor fear
of tying up threads.
This seems like a classic problem of mapping synchronous EJB calls toasynchronous
backends.
Any suggestions how to do this?
Thanks,
Jabir

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