topic Re: Persisting Service Tasks in ACT_RU_EXECUTION in Alfresco Archive

Persisting Service Tasks in ACT_RU_EXECUTION

workflowuser2 — Wed, 20 Jun 2012 06:29:26 GMT

Hi,I have processes comprised of long-running service tasks (Java Delegates). In order to support fail-over, I would like to persist state before each service task.Based on my understanding, only receive/user and other wait tasks are flushed to the table.Is there a workaround (by using ParserListene

Re: Persisting Service Tasks in ACT_RU_EXECUTION

frederikherema1 — Wed, 20 Jun 2012 06:40:48 GMT

Read the chapter in our user guide about Asycn continuations: http://activiti.org/userguide/index.html#asyncContinuations

Basically, by marking your service-task as async, the process state will be persisted and the service-task will be executed in a job-executor thread, the calling thread's control will be returned.


<serviceTask id="service1" name="Generate Invoice" activiti:class="my.custom.Delegate" activiti:async="true" />

Re: Persisting Service Tasks in ACT_RU_EXECUTION

workflowuser2 — Wed, 20 Jun 2012 15:51:57 GMT

Thank you, workflowuser2, for the quick reply.

My sample process is:
start -> service task1 -> service task2 -> service task3 -> end

here i would like the service tasks to be processed "in order".

Now if I put "async=true" in "each" service task, would activiti engine guarantee the order?

I was trying to see if I can somehow decorate service tasks (or create my own service task) with wait semantics so that process state is flushed before each service task.

thanks again for the help.

Read the chapter in our user guide about Asycn continuations: http://activiti.org/userguide/index.html#asyncContinuations

Basically, by marking your service-task as async, the process state will be persisted and the service-task will be executed in a job-executor thread, the calling thread's control will be returned.

<serviceTask id="service1" name="Generate Invoice" activiti:class="my.custom.Delegate" activiti:async="true" />

Re: Persisting Service Tasks in ACT_RU_EXECUTION

ronald_van_kuij — Wed, 20 Jun 2012 18:32:07 GMT

Now if I put "async=true" in "each" service task, would activiti engine guarantee the order?

Yes, because that is the order in which you modeled them. (You did not model them in parallel)

Re: Persisting Service Tasks in ACT_RU_EXECUTION

workflowuser2 — Thu, 21 Jun 2012 18:23:33 GMT

Thanks.