topic Re: Specifying intermediate rules among activities in Alfresco Archive

Specifying intermediate rules among activities

ddweerasiri — Mon, 10 Feb 2014 01:55:19 GMT

Hi,This is a question related to modelling. Suppose I have two activities (Service-Task1 and Service-Task2) in a sequence. And there is a process variable (Var1). Suppose the value of Var1 is modified by another repetitive ServiceTask which runs concurrently to the Service-Task1 and Service-Task2. S

Re: Specifying intermediate rules among activities

jbarrez — Mon, 10 Feb 2014 09:10:19 GMT

Hmm that is indeed a good use case… However I don't think we have out of the box support for it like you describe.

A workaround could be to have a looping mechanism in the process before service-task-2, that checks the var, and if not correct goes into an intermediary timer for xx seconds/minutes/whatever/… effectively looping/blocking until the var is set.

Ah now that I think of it! Forget that last sentence. Too hacky.

Two solutions:
- Use a receive task before the service task 2. have a sequence flow listener that signals the execution waiting in the receive task
- Use a signal throw after the repetitive task and a catch on the boundary of a receive task before service task 2. Set the signal scope to process instance scope.

Re: Specifying intermediate rules among activities

ddweerasiri — Tue, 11 Feb 2014 02:45:15 GMT

Thanks Joram for two solutions. Could you please explain what you meant by "sequence flow listener". In the BPMN editor in Activiti explorer, I couldn't find such element.

Thanks,
Denis
http://ddweerasiri.blogspot.com

Re: Specifying intermediate rules among activities

trademak — Tue, 11 Feb 2014 15:07:00 GMT

With sequence flow listener an execution listener on a sequence flow is meant.

Best regards,