[rules-users] Fwd: Retrieving constraints based on a manual solution

[Geoffrey De Smet]

Op 07-01-13 09:08, Reinis schreef:
> Hello Sreeni,
>
>   > 2. in scenario b, I do not want to run the solver for best solution.
>
> This is what I interpret from your question:
> 1. you have some sort of working solution that is manually optimized to
> some degree (by human?);
> 2. you are willing to determine what constraints are still violated
> based on a rule base you created with drools but WITHOUT changing the
> actual manual working solution and WITHOUT running solver for multiple
> times;
>
> If this interpretation is correct, there is a way in drools planner to
> calculate score once and iterate working memory looking for constraint
> occurrences. WARNING, this API is intended to be internal and thus
> subject to a likely change:
>
>           ScoreDirector scoreDirector =
> solver.getScoreDirectorFactory().buildScoreDirector();
>           scoreDirector.setWorkingSolution(schedule);
>           scoreDirector.calculateScore(); <- only once, causes working
> memory to fire all rules but does not involve solver "search loop"
The part above is documented in the manual. Look for guiScoreDirector.
>
>           WorkingMemory workingMemory = ((DroolsScoreDirector)
> scoreDirector).getWorkingMemory();
>           Iterator<ConstraintOccurrence> it =
> (Iterator<ConstraintOccurrence>) workingMemory
>               .iterateObjects(new
> ClassObjectFilter(ConstraintOccurrence.class));
>           while (it.hasNext()) {
>               //here you collect constraint occurrences and prepare your
> report
>           }
That part isn't documented in the manual, but it works :)
>
> Hope this helps, for a complete example of the usage of this (internal!)
> api see drools planner examples from Geoffrey on Git.
Also look into "immovable entities" (see manual). You 'll need that if 
you want to combine scenario a and b.
>
> br
> Reinis
>
> On 01/07/2013 04:38 AM, Sreeni Maheshwaram wrote:
>>      Hi,
>>
>>      Could you please advise:
>>
>>      I am using the Drools Planner (5.5) to a) optimize the solution
>>      and get best
>>      solution b) allow the manual solution and resolve the conflicts,
>>      based on
>>      the business requirement.
>>
>>      1. scenario a is straight forward.  I could run the solver, get
>>      the best
>>      solution, set it to the ScoreDirector as working solution, get the
>>      constraints from the working memory.
>>
>>      2. in scenario b, I do not want to run the solver for best
>>      solution. When I
>>      set the manual solution as a working solution on the
>>      ScoreDirector, I could
>>      not get the constraints.
>>
>>      As a work around, either I have to run the solver in scenario b
>>      for some
>>      time to get the constraints, which I can not afford and I do not
>>      think the
>>      constraints relate to the manual solution.
>>
>>      Is there a way to get cosntraints based on the manual solution without
>>      running the solver?
>>
>>      regards,
>>      Sreeni
>>
>>
>>
>>      --
>>      View this message in context:
>>      http://drools.46999.n3.nabble.com/Retrieving-constraints-based-on-a-manual-solution-tp4021357.html
>>      Sent from the Drools: User forum mailing list archive at Nabble.com.
>>
>>
>>
>>
>> -- 
>> Thanks, Sreeni M
>>
>>
>>
>> -- 
>> Thanks, Sreeni M
>>
>>
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