[jboss-jira] [JBoss JIRA] (JBRULES-3643) Drools Planner score corruption during construction heuristics if there are rules that check if planning variable is null

[Geoffrey De Smet (JIRA)]

    [ https://issues.jboss.org/browse/JBRULES-3643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12722565#comment-12722565 ] 

Geoffrey De Smet commented on JBRULES-3643:
-------------------------------------------

Occurs because undoWM and lastStepWM are different: the entity is inserted but not retracted.
The undoSolution and the lastStepSolution are equal.


Needs to be fixed with the work for the scalable constr heuristics
                
> Drools Planner score corruption during construction heuristics if there are rules that check if planning variable is null
> -------------------------------------------------------------------------------------------------------------------------
>
>                 Key: JBRULES-3643
>                 URL: https://issues.jboss.org/browse/JBRULES-3643
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: drools-planner
>    Affects Versions: 5.4.0.Final
>         Environment: linux 32bit JavaSE 1.6
>            Reporter: Reinis Vicups
>            Assignee: Geoffrey De Smet
>            Priority: Minor
>
> A score corruption occurs in DEBUG environment Mode during construction heuristics if there are rules that add constraints if planning variable is null e.g.
> {code}
> rule "no foo without bar"
>     when
>         $foo : Foo(bar == null)
>     then
>         insertLogical( new IntConstraintOccurrence("foo without bar", ConstraintType.NEGATIVE_HARD, 1, $foo) );
> end
> {code}
> Debugging show following sympthoms: While org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider executed doMove() a deviation between undoScore and lastCompletedStepScore occur (around the 108th line of code):
> {code}
> ...
>         if (assertUndoMoveIsUncorrupted) {
>             GreedyFitSolverPhaseScope greedyFitSolverPhaseScope = moveScope.getGreedyFitStepScope()
>                     .getGreedyFitSolverPhaseScope();
>             Score undoScore = greedyFitSolverPhaseScope.calculateScore();
>             Score lastCompletedStepScore = greedyFitSolverPhaseScope.getLastCompletedStepScope().getScore();
>             if (!undoScore.equals(lastCompletedStepScore)) { //<-- HERE scores deviate!
> ...
> {code}
> Again, this occurs only in DEBUG environment mode!

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