[rules-users] Wanted Patterns in Planner/Rostering

[Geoffrey De Smet]

On 18-07-13 05:30, john poole wrote:
> I'm using the Nurse Rostering code as a base and adding my own rules, etc.
> Are there any examples of "wanted" patterns? It looks like all the input
> files, and the drl rules are all for "unwanted" patterns. I just want to
> make sure I'm not missing something obvious.
Positive constraints (aka "wanted" patterns) are fully supported in 
OptaPlanner.
Just none of the example use them (IIRC).

Instead of doing this for an unwanted pattern:
         scoreHolder.addSoftConstraintMatch(kcontext, - 
$pattern.getWeight());
do this for a wanted pattern:
         scoreHolder.addSoftConstraintMatch(kcontext, $pattern.getWeight());

Also, you probably want your solver configuration's 
constructionHeuristic not use any pickEarly.
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