topic Re: Parallel Gateway and Java Concurreny with Java Service Task in Alfresco Archive

Parallel Gateway and Java Concurreny with Java Service Task

rdewall — Fri, 01 Apr 2011 23:51:14 GMT

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

Re: Parallel Gateway and Java Concurreny with Java Service Task

jbarrez — Mon, 04 Apr 2011 06:54:05 GMT

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.

Re: Parallel Gateway and Java Concurreny with Java Service Task

jherryft — Tue, 12 Apr 2011 08:32:08 GMT

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.

Re: Parallel Gateway and Java Concurreny with Java Service Task

tombaeyens — Tue, 12 Apr 2011 11:54:20 GMT

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.

Re: Parallel Gateway and Java Concurreny with Java Service Task

filipearaujo — Thu, 22 Sep 2011 14:00:47 GMT

jherryft, did you get a workaround?

Re: Parallel Gateway and Java Concurreny with Java Service Task

ronald_van_kuij — Thu, 22 Sep 2011 16:10:21 GMT

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

Re: Parallel Gateway and Java Concurreny with Java Service Task

jherryft — Mon, 26 Sep 2011 09:02:49 GMT

I used the workaround given by tombaeyens.