JBPM 5.1 Final Release with jboss-5.1.0.GA - Events

[priyakpandey]

Hi,

I was reading through the JBPM 5.1 Final Release documents (JBPM User Guide) and read about Events (Chapter 5 - Page no 59).

I created a sample process which has event (Internal) and it works fine.

Generally Event actions are executed asynchronously.

I created a process with start -> Human Task -> End, On Entry Actions of Human Task I trigger the event. I have put print lines to trace the flow. What i observed is Events gets triggered on On Entry Actions of Human Task then Event actions gets executed and then Human Task  moves ahead. This makes execution synchronous.

Can someone please confirm the behaviour whether Event actions are executed synchronously/ asynchronously?

Thanks in Advance.

[priyakpandey]

is there any input on this?

[krisverlaenen]

Sending the event is synchronous.  If you want to process the event asynchronously, you can model the actual event handling asynchronous of course.  For example, if you use a service task after the signal event (that catches the signal) to execute asynchronously, then the engine will continue the human task while the signal is being processed asynchronously.

In general, most logic is executed synchronously (as multi-threading usually gives more disadvantages than advantages), but you can use asynchronous tasks to model concurrency.  Check out the section on multi-threading for some more information:

http://docs.jboss.org/jbpm/v5.1/userguide/ch05.html#d0e1808

Kris

[priyakpandey]

Thank you for the response!

I am doing this and it is working as pwe my requirement.