[jboss-user] [jBPM Development] - foreach activity

[Alejandro Guizar]

Alejandro Guizar [http://community.jboss.org/people/alex.guizar%40jboss.com] replied to the discussion

"foreach activity"

To view the discussion, visit: http://community.jboss.org/message/546907#546907

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> Tim Johnson wrote:
> 
> BPMN 2.0 introduces the multi-instance loop characteristic for activities. The expr attribute is similar to the completionCondition (this is what I meant in my comment on JBPM-2414)    
The *expr* attribute in the transition that leaves from *foreach* is not a completion condition. It is more of a +creation+ condition. If the condition is not met for a particular element of the collection, the child execution that would correspond to that element is not created.

In JBPM-2414 you suggested a completion condition be added to *join*. As Maciej noted, this is already provided by the   http://docs.jboss.com/jbpm/v4/userguide/html_single/#concurrency multiplicity attribute. As part of his work on  https://jira.jboss.org/browse/JBPM-2720 JBPM-2720 he made multiplicity accept expressions in addition to literal numbers.
> could the implementation also include support for the isSequential flag that controls sequential or parallel execution of the activity instances?
Both *fork* and *foreach* are sequential. However, if you set the  http://docs.jboss.com/jbpm/v4/userguide/html_single/#asynchronouscontinuations continue attribute to *async* in the following activities, execution can be made parallel provided the job executor is employing multiple threads.
> Also can the ability to initiate additional activity instances be  supported? This is described in workflow pattern 36 ( http://www.workflowpatterns.com/patterns/control/new/wcp36.php http://www.workflowpatterns.com/patterns/control/new/wcp36.php).  Could this be implemented with an event listener (<on  event="end">) added to the foreach? For example: Three contracts are  scheduled for drafting, during the execution of one of these activities  an additional contract draft is deemed necessary, this is added by the  event listener before the completeCondition expression is evaluated.
In the interest of getting this done as soon as possible to release 4.4, let us not add new requirements. We can always revisit later.
> The current patch in JBPM-2414 supports only multiple task instances, it  would be great if your solution could support sub-processes.
Any activity may follow foreach, not just tasks.

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