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

[Reinis]

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"

         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
         }

Hope this helps, for a complete example of the usage of this (internal!) 
api see drools planner examples from Geoffrey on Git.

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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