Conditional start event explanations

[amart...@fbk.eu]

Hi everybody,
  using Jbpm 6.4.0 Final and eclipse based modeler I'm trying to find a way to configure a conditional start event.

In particular using as condition for start this script, using a variable defined inside the process as condition to start or not the process

if (processVar1.equals("A")) {
return true;
}  else {
return false;
}

I've added the process, thanks for anyone want to help me !

I've tried to find any clues on that conditional start on documentation, with any luck, if there is a section about it, I'm ready to read and learn from it!

[Maciej Swiderski]

conditional events depends on external change in ksession. For example you can have a conditional start event that will start whenever new fact (e.g. Person) is added to working memory. You can’t rely on process variables because process variable does not exist as process instance is not there yet.

Maciej

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<subProcess.bpmn2>

[amart...@fbk.eu]

Thanks Maciej for quick explanation.

There is a tutorial/example on how compose a conditional start and add a new fact to working memory  ?

[Maciej Swiderski]

I am not aware of any tutorial for it but it’s actually drools rule that needs to be matched. in conditional event definition you specify rule condition in (drl - drools rule language) that is then “monitoring” the working memory - ksession. So once you insert facts into that ksession when rule matches it will the start new process instance.

There are few test cases that you can take a look at:

this process starts whenever there is a new Person with name john found in working memory:

https://github.com/droolsjbpm/jbpm/blob/master/jbpm-bpmn2/src/test/resources/BPMN2-ConditionalStart.bpmn2#L23

Maciej

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