[jboss-jira] [JBoss JIRA] (JBRULES-3317) Planner should support a null planning value

[Geoffrey De Smet (Created) (JIRA)]

Planner should support a null planning value
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                 Key: JBRULES-3317
                 URL: https://issues.jboss.org/browse/JBRULES-3317
             Project: Drools
          Issue Type: Feature Request
      Security Level: Public (Everyone can see)
          Components: drools-planner
            Reporter: Geoffrey De Smet
            Assignee: Geoffrey De Smet
             Fix For: 5.4.0.Beta1


Several users on the user mailing list have run into this, especially for task assignment use cases.

Example use case:
@PlanningEntity TaskAssignment assigns a Task to a @PlanningVariable Employee
There are so many Tasks, that's better to not assign some Tasks for now.

Current workaround:
Make a Employee representing NONE,
which is the only Employee instance that returns true on employee.isNone()
and the score rules are written to deal with that.

Technical difficulty to fix:
The @PlanningVariable(s) of a @PlanningEntity with planning value null are considered to be "uninitialized".
Partial uninitialized solution detection are fundamental for repeated planning (including real-time planning),
because the construction heuristics need to detect which parts of the solution to intialize, but not everything because that takes to long.


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