[Drools Planner] Hard constraint appears to be ignored
by Reinis
Hello, it appears that hard constraint I have defined is being ignored
in some rare cases. Here's an example:
This is what my application logs after getting best solution after
solver has returned from solve():
2012-02-23 21:28:54,595 [main] INFO Project Project1 assignment
563:[2012-02-27T13:00:00.000/2012-02-27T17:00:00.000] was assigned to John
2012-02-23 21:28:54,597 [main] INFO Project Project2 assignment
508:[2012-02-27T13:00:00.000/2012-02-27T17:00:00.000] was assigned to John
(The log says that John was assigned twice in same time period to two
different assignments (assignment 563 and assignment 508)
Here short explanation of the relevant domain data
assignment.id = 563
assignment.interval = 2012-02-27T13:00:00.000/2012-02-27T17:00:00.000
assignment.project = Project1
assignment.resource = John
And this is rule that, to my opinion should've prohibited that two
assignments get assigned to the same resource:
rule "only one assignment within interval for the same resource"
when
$leftAssignment : Assignment($leftId : id, $interval :
interval, resource != null, $resource : resource)
$rightAssignment : Assignment(interval == $interval, resource
== $resource, id != $leftId)
then
insertLogical(new IntConstraintOccurrence("only one assignment
within interval for the same resource", ConstraintType.NEGATIVE_HARD, 1,
$leftAssignment, $rightAssignment));
end
The score looks like this:
2012-02-23 21:28:54,594 [main] DEBUG The hard score is: 0 and the soft
score is: -532
So no hard constraints are broken according to planner.
My question is not what is wrong with this particular example (unless it
is obvious for you), but if you can think of any anti-pattern that would
cause this behavior?
What I already checked is:
- this happens really sporadically (most of the time the result is
CORRECT but in 1 from 5 runs I get this kind of error);
- I checked, re-checked and re-re-checked all the hashCode, compareTo,
solutionHashCode, solutionCompare, clone, ... methods - they appear to
be correct;
- moves are simple and I tried to keep them consistent with the way
moves in drools-planner examples are constructed;
Would be great if you could give me a hint to what direction I should
look next.
br
Reinis
14 years, 1 month
Drools & jBPM Event : London 8th March 2012
by Mark Proctor
http://blog.athico.com/2012/02/drools-jbpm-event-london-8th-march-2012.html
-----
Register now to join us for the free Drools & jBPM London 2012 event,
hurry limited spaces :)
http://redhat-mail.com/t/XRU-OE4J-824IMOYW1D/cr.aspx
When Thursday 8th March
Where Stationers Hall, London
Agenda trans
trans trans trans
trans
trans
09:00 trans Registration, tea and coffee
trans
09:30 trans Introduction/ Welcome
trans
09:45 trans Rules, Events & Processes: the Open Source way
Mark Proctor - Worldwide Technical Lead for BRMS & BPMS, Red Hat
trans
10:45 trans Decision Tables
Michael Anstis, JBoss Core Developer, Red Hat
trans
11:15 trans Tea/Coffee Break
trans
11:30 trans BPMN2 and jBPM5
Kris Verlaenen, JBoss Core Developer, Red Hat
trans
12:15 trans Solving Planning Problems
Geoffrey de Smet, JBoss Core Developer, Red Hat
trans
12:45 trans Case Studies
trans
13:00 trans Lunch and Networking
trans
14 years, 1 month
5.4.0.Beta2 parse error in consequence /* in string
by Benjamin Bennett
Just passing on I am using the drools 5.4.0Beta2
The following doesn't compile using the mvel dialect .
rule "some rule"
when
fact: Fact()
then
BasicFact fault= new BasicFact( "/*");
end
but
rule "some rule"
when
fact: Fact()
then
BasicFact fault= new BasicFact( "/ *");
end
does compile some how /* is being parsed as an expression I think and not a
string literal.
Thanks,
Ben
14 years, 1 month
limits on number of rules in Guvnor in a package, loaded in knowledge base
by vadlam
are there are any benchmarks around number of rules that can be created in a
package in Guvnor?
we run Guvnor 5.3.0.final in Guvnor on a windows server that has 1.4 GB heap
and we are seeing memory issues when the package has reached around 900
rules or so.
by memory issues, I mean that after the package is built successfully,
memory is not being released back. this behaviour is more obvious at such
high number of rules in package than when we had just around 600 rules or
so.
also, when we try to load the package generated (around 6.4 MB) into the
knowledgesession, it crashes the system .
are there any recommendations on
1. whether we can split up a package into two separate packages, and load
the 2 of them separately one after the other into the session ?
2. amount of memory that guvnor needs to build such high number of rules ?
3. ways to shrink the number of rules as per some best practices while
still meeting requirements ?
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14 years, 1 month
Drools Guvnor 5.0.1 - Memory Usage Tuning
by tdakanalis
Hi,
We're using Drools Guvnor 5.0.1 in a production environment, running on
Tomcat 6. We're experiencing permgen issues, particularly when doing large
imports of rules, archiving, or compilation of rules.
Following permgen exceptions, we increased the permgen to :
-XX:MaxPermSize=2048M -ms3192M -mx3192M.
This sustained us for a while, but our assets are ever growing, and again
we're exceeding the permgen space allocated. Can someone recommend
appropriate settings/configuration in order to reduce the memory/cpu usage?
Assets in Guvnor:
~ 21K rules in 11 decision tables (.xls) in 1 package
Thanks,
Themistoklis Dakanalis
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14 years, 1 month
Getting java.lang.ClassCastException: - using Drools 5.3
by kashif10
HI.
I am getting following exception.
Exception in thread "main" org.drools.RuntimeDroolsException:
d1.rule.Rule_8f09c0aa350100000080cb1e0dd40f6fEval4Invoker@f6f66af4 :*
java.lang.ClassCastException: d1.rule.facts.Medication cannot be cast to
d1.rule.facts.Procedure*
at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:119)
at
org.drools.reteoo.EvalConditionNode.assertLeftTuple(EvalConditionNode.java:178)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:197)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:72)
at org.drools.reteoo.JoinNode.assertObject(JoinNode.java:161)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:458)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:386)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:134)
at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:215)
at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:244)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:330)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:291)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:886)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:845)
at
org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:255)
at d1.rule.facts.PatientFacts.loadFactsInSession(PatientFacts.java:6075)
at d1.rule.DREvaluator.startEvaluation(DREvaluator.java:278)
at d1.rule.DREvaluator.main(DREvaluator.java:72)
Caused by: java.lang.ClassCastException: d1.rule.facts.Medication cannot be
cast to d1.rule.facts.Procedure
at
d1.rule.Rule_8f09c0aa350100000080cb1e0dd40f6fEval4Invoker.evaluate(Unknown
Source)
at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:114)
Following is the rule. I found that due to "or" the Procedure block not
runs.
If I change "or" to "and" than procedure block executed & the error not
produced.
I am not sure what's the problem, I am using Drool 5.3
rule "8f09c0aa350100000080cb1e0dd40f6f"
when #conditions
(
$cepFacts: CEPFacts(id=="D1")
and
eval($cepFacts.initialize())
and
(
(
$DxDate_1 : ( Medication( name equalsIgnoreCase "Ofloxacin" ) )
and
eval($cepFacts.checkRelativeValues($DxDate_1) )
)
or
(
$DxDate_2 : ( Procedure( name equalsIgnoreCase "Pres antibiotic" )
)
and
eval($cepFacts.checkRelativeValues($DxDate_2) )
)
)
and
(
$DxDate_3 : ( Medication( name equalsIgnoreCase "Trazodone" ) )
and
eval($cepFacts.checkTimeIs($DxDate_3)
)
)
then
resultIds.add("8f09c0aa350100000080cb1e0dd40f6f");
end
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14 years, 1 month
Drool Function error
by shawn
I write a function in drool, but it always has error.
The error is :The method insertLogical(PreCondition) is undefined for the
type InsertPreCondition
Is it because insertLogical must be used in RHS?
Is there any way to use insertLogical in function or implement the function
in RHS?
code:
import PreCondition;
import Authorization;
function void insertPreCondition(Authorization a) {
// a.getPreCondition() returns an arraylist
for( PreCondition pc : a.getPreCondition() ){
insertLogical( pc );
}
}
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14 years, 1 month
