[rules-users] Problems with globals in bpmn-flows

[Kris Verlaenen]

Bjorn,

Unfortunately, the BPMN2 specification does not define anything that 
could be used to store globals (or imports for that matter).
We've always held back a little on adding custom extensions to the BPMN2 
spec but since it is stable now, I guess we will have no other choice.
I'll be adding some of the missing features that Drools Flow had as 
custom extensions of BPMN2 in the next few weeks.
You'll be able to do exactly what you describe after that.

As an alternative solution, you could however also use a rule task and 
add that one rule you described to handle calling the service.  You 
can't access working memory objects like that in a script task, but 
using a rule task with only one rule that should be possible.

Kris

Mahler wrote:
> Hello dear list,
>
> I currently have problems to access global variables in a drools 5.1 bpmn rule-flow. I have a script-task at the end of my process-flow in which I want to call a method of an "external" service. I instantiated the service and set it as global in the ksession before starting the process. In the script-task I add global x.y.z.MyService myService with the same name as setted before and call the object with the method with script-type mvel/java: myService.xyz();
>
> Is this the right way doing this? Because I'm receiving the error-message "cannot access variable with name 'myService'" or similar (can't remember exactly).
>
> When adding the service as a "process variable" in the model and then starting the process, I can access this variable in the script-task... but - I think using globals would be much nicer for accessing the service in some of my rules in the same way under the same variable.
>
> After all I also don't know how to access modified process-variables in my task. For example if I change some object in a rule-task before and in a script-task later I want to call a service with the modified object... do I have to read a process variable in the rule, modify it and then in the script-task I access the process-variable or could I access the changed object in the working-memory in the script-task as well? Like or similar because this is just rule-style:
> when
>         $o : MyObject (withMyChangedParameter == 'x')
> then
>         service.myMethod($o);
>
> TIA
> Björn
>
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