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Parallel Gateway and Java Concurreny with Java Service Task

rdewall

Currently, the Parallel Gateway does not guarantee (nor support I don't think) concurrency of Java Service Tasks, as from what I can tell, the tasks are executed sequentially.

1) Is there plans to support concurrency of Java Service Tasks used with Parallel Gateways?
2) Is there a recommended method to mimic this true parallelism with Java Service Tasks?

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Comments

jbarrez

No, parallel refers to 'business concurrency', not to actual threading.

Secondly, having 'real' concurrency mixed with the transactions of executing the process is asking for troubles: synchronisations, race conditions, etc. So in the end, in our opinion, it's just not worth it.

jherryft

This is too bad… why will I use parallel gateways if you execute task sequentially?
I need this functionnality to work, do you have a work around?
Thank you.

tombaeyens

there is a workaround (a rather heavy one)

for each parallel branch, you send a message (jms or so) and then introduce a wait state. once that transaction commits, the message listener of the queue will be called and that should just send a signal to the execution.

that principle is what we call an asynchronous continuation. it's on our roadmap, but we can't tell at this point when it will make it into a concrete release.

filipearaujo

jherryft, did you get a workaround?

ronald_van_kuij

the 'workaround' is described above. But you can also try the sourcecode and look at async continuations.

jherryft

I used the workaround given by tombaeyens.