10:12 p.m.
Hi! I'm new to this forum so... my name is Manuel and I'm using drools
planner to solve an exam scheduling problem :)
I need to analyze which constraints are broken while the algorithm is
running and when the solver finishes also. Geoffrey pointed me to the
examples, where that is done.
I copied the getScoreDetailList() idea from that example, and it works
perfectly fine for when the algorithm is running (constraints are found and
I can inspect them). The basic idea is that this method obtains the working
memory and obtains from it the objects of type ConstraintOccurrence.
The thing is, when the solver finishes and I call this method, it returns
no constraints, even though I know by the score that some constraints are
still broken. Am I doing something wrong? Or is this the expected
behaviour? It seems as if working memory erases the ConstraintOccurrences
when the solver finishes, but I don't really know. In that case, how can I
obtain the constraints broken for the final solution?
Hope I made myself clear! Thanks!
Manuel
8:05 a.m.
Untill 5.4.0.beta2, the examples GUI reused the Solvers WorkingMemory, which
is bad. In CR1 this is no longer the case (see github master), but not
perfect yet. For 5.5 I ll improve and document it
https://issues.jboss.org/browse/JBRULES-3328
In all 3 cases the gui can get the constraint occurences after the solver
has ended, so compare your code. I recommend to upgrade to planner-examples
cr1 as soon as it out and do like the planner-examples of version cr1.
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6:24 p.m.
Hi geoffrey, thanks for your reply.
I followed examples from the older versions (pre 5.4.0.beta2 i guess), using
the solvers WorkingMemory.
After the *solver.solve()* method returns, calling
*workingMemory.iterateObjects()* will return no objects of type
*IntConstraintOccurrence*. Is this expected? While the solver is solving, I
can obtain this objects and inpect the score inside the
*bestSolutionChanged* callback, but afterwards, I only get the problem facts
and my planning entities.
I'm really confused with what is happening as I don't fully understand how
the solver operates the working memory, but is it possible that after
solving the score isn't calculated any more, generating no new
*IntConstraintOccurrence* after solver has finished solving?
Thanks a bunch!
Manuel
ps. to make myself clear, if I run *workingMemory.iterateObjects()* while
it's solving I get this types of objects:
ar.edu.itba.epa.core.domain.io.Materia
ar.edu.itba.epa.core.domain.solver.facts.ConflictoAlumnosMateria
ar.edu.itba.epa.core.domain.io.Horario
ar.edu.itba.epa.core.domain.solver.facts.CorrelatividadMateria
*org.drools.planner.core.score.constraint.IntConstraintOccurrence*
ar.edu.itba.epa.core.domain.Examen
ar.edu.itba.epa.core.domain.io.Aula
and afterwards I only get:
ar.edu.itba.epa.core.domain.io.Materia
ar.edu.itba.epa.core.domain.solver.facts.ConflictoAlumnosMateria
ar.edu.itba.epa.core.domain.io.Horario
ar.edu.itba.epa.core.domain.solver.facts.CorrelatividadMateria
ar.edu.itba.epa.core.domain.Examen
ar.edu.itba.epa.core.domain.io.Aula
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7:57 a.m.
Hi, Geoffrey!
I'm using drools-planner-5.4.0.CR1 and I wanna get list of broken
constraints for final best solution
and also looked of examples of 5.4.0.CR1
I've implemented like in example but it returns empty list
source on stackoverflow:
http://stackoverflow.com/questions/10222382/getting-list-of-broken-constr...
source prototype
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3 comments
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participants (4)
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ge0ffrey -
Manuel Aráoz -
maraoz
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Nurlan