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

Thu Mar 29 12:08:48 EDT 2012

    [ https://issues.jboss.org/browse/JBRULES-3317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12680375#comment-12680375 ] 

Chris Dolan commented on JBRULES-3317:
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Could someone please add a brief note about this in the docs? I think the workaround is quite acceptable, but the docs are very misleading because they say "If null is a valid planning value, it should be included in the value range and the default way to detect uninitialized planning variables must be changed." (http://docs.jboss.org/drools/release/5.4.0.Beta2/drools-planner-docs/html/ch03.html)

> Planner should support a null planning value
> --------------------------------------------
>
>                 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.CR1
>
>
> 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 is 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 too long.

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