How to access process instance's variables via jbpm api when using per request runtimemanager?

[c00823ue]

For example, I create a process instance by Kiesession A.

How to access the variables in that processinstance after the RuntimeEngine is disposed by per request runtimemanager?

I have read the per request strategy part at the following url.

https://docs.jboss.org/jbpm/v6.0.1/userguide/jBPMCoreEngine.html

  KieSession information will be removed from the database in case persistence was used.

Is it possible to get variables of a processinstance without knowing it Kiesession id?

How to get variables of a processinstance after the kiesession id is removed from database?

Now I can only access the process instance variables via processeventlistener in the kiesession within the request.

Or should I save the processinstance variables by another table, I create, when processinstance is not finished?

THX!