Asynchronous Tasks Continuation

[richip]

I've a very simple requirement that it seems almost textbook case, but I can't seem to find it in the examples that I've found over Google or using the search function of the forums (perhaps I'm using the wrong term? "asynchronous")

Basically, I've a process that requires an execution of a remote service from my engine but it's asynchronous in nature. Meaning, the expected response will come back through a later session (in this case through a queue). I can handle the message transport no problem, but 1) I don't know what components in the BPMN diagram to use to model this and 2) obviously depending on which components I use, what methods to invoke in the RuntimeService to invoke to continue the process from where it stopped.

If there a cookbook of examples somewhere?

[richip]

Figured it out. The only way this seems to work for me is if I use a ServiceTask (with the Asynchronous flag set) with a sequenceFlow to a MessageStartEvent (with the message configured on the Process). I tried a whole slew of others (including having an EventSubProcess and a SubProcess with various start events) and this is the only combination that seems to work. Not sure if it's the right one, though.

[jbarrez]

The way this is typically handled is either
- use a combination of a service task that sends out a message and a receive task afterwards. The message coming back will have to use the executionId to correlate
- use a custom ActivityBehaviour (NOT JavaDelegate) that does the sending + waiting for the message in one step (similar to previous, but visually in one step)

[govin_pillay]

Hi jbaeeez,

could you perhaps give an example of implementing the above.

Thanks.