Problem using BatchExecutionCommand - appears to process same command repeatedly
by Rhodes, Phil
Hey all, I'm working with Drools Expert 5.3.0 Final and have run across
a problem that has me pulling my hair out.
Basically, I'm creating a couple of Commands, adding them to a
BatchExecutionCommand and then executing that
command... but based on the output of the processing, it looks like the
same command was executed repeatedly, instead
of the Commands being iterated.
Here's what my rule file looks like:
package exp
import exp.DriversLicense3Main.Applicant;
import exp.DriversLicense3Main.Application;
rule "Is of valid age"
when
$app: Applicant( age < 18 )
$a : Application()
then
System.out.println( "matched one: " + $app.getName() );
$a.setValid( false );
end
And here's the driver that runs things:
public static void main(String[] args)
{
final KnowledgeBuilder kbuilder = KnowledgeBuilderFactory
.newKnowledgeBuilder();
// this will parse and compile in one step
kbuilder.add( ResourceFactory.newClassPathResource(
"DriversLicense3.drl",
DriversLicense3Main.class ),
ResourceType.DRL );
// Check the builder for errors
if ( kbuilder.hasErrors() ) {
System.out.println( kbuilder.getErrors().toString() );
throw new RuntimeException( "Unable to compile
\"DriversLicense3.drl\"." );
}
// get the compiled packages (which are serializable)
final Collection<KnowledgePackage> pkgs = kbuilder
.getKnowledgePackages();
// add the packages to a knowledgebase (deploy the knowledge
packages).
final KnowledgeBase kbase =
KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages( pkgs );
StatelessKnowledgeSession ksession =
kbase.newStatelessKnowledgeSession();
Applicant applicant1 = new Applicant( "Phillip", 38 );
Application app1 = new Application();
List l1 = new ArrayList();
l1.add( app1);
l1.add( applicant1);
Applicant applicant2 = new Applicant( "Joe", 17 );
Application app2 = new Application();
List l2 = new ArrayList();
l2.add( app2 );
l2.add( applicant2 );
List<Command> cmds = new ArrayList<Command>();
cmds.add( CommandFactory.newInsertElements( l1, "phil", true,
"phil" ) );
cmds.add( CommandFactory.newInsertElements( l2, "joe", true,
"joe" ) );
BatchExecutionCommand batch =
CommandFactory.newBatchExecution(cmds, "ksession1");
ExecutionResults results = ksession.execute( batch );
System.out.println( ((List<Applicant>)results.getValue( "phil"
)).get(1).getName() + ": " + ((List<Application>)results.getValue(
"phil" )).get(0).isValid() );
System.out.println( ((List<Applicant>)results.getValue( "joe"
)).get(1).getName() + ": " + ((List<Application>)results.getValue( "joe"
)).get(0).isValid() );
System.out.println( "done" );
}
Applicant and Application are just some data classes that look like
this:
public static class Applicant
{
private String name;
private int age;
public Applicant() {}
public Applicant( final String name, final int age )
{
this.name = name;
this.age = age;
}
// getter and setter methods here
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
public int getAge()
{
return age;
}
public void setAge(int age)
{
this.age = age;
}
}
public static class Application
{
private Date dateApplied;
private boolean valid = true;
// getter and setter methods here
public Date getDateApplied()
{
return dateApplied;
}
public void setDateApplied(Date dateApplied)
{
this.dateApplied = dateApplied;
}
public boolean isValid()
{
return valid;
}
public void setValid(boolean valid)
{
this.valid = valid;
}
}
So when I run this, I would expect to see the application "Joe" match
the rule and have the valid attribute on the Application set to false,
while
the "Phil" one should remain true. But when I run this, I get the out
(from my println command in the rule)
matched one: Joe
matched one: Joe
and when I retrieve the results by name, I find that both Applications
have had the valid field set to false.
Can anybody help point me in the right direction here? Am I doing
something wrong, or is this possibly a bug in Drools, or something else?
Thanks,
Phil
Visit us on the Web at mesirowfinancial.com
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14 years, 1 month
Cant check complex boolean expressions with Collections.disjoint
by aitchnyu
I have a `SubjectTeacherPeriod` object which has a property `strAttributeMap`
which is a map of `String` and `List<String>`. I want to check if
`HardConstraint.strAttributeValue` and
`SubjectTeacherPeriod.strAttributeMap[$attribute]` *intersect*. Here is the
rule:
rule "hardConflictIsIn"
when
$hc : HardConstraint(
$attribute : attribute,
operator == "is in",
$values : strAttributeValue,
$period : period
)
$stp : SubjectTeacherPeriod(
period == $period,
//ERROR IN FOLLOWING LINE
Collections.disjoint(strAttributeMap[$attribute], $values) ==
false
)
then
insertLogical(new IntConstraintOccurrence("hardConflictIsIn",
ConstraintType.NEGATIVE_HARD,1,
$hc,$stp));
end
But the rule (actually two of them) throws the error:
Exception in thread "main" java.lang.IllegalStateException: There are errors
in the scoreDrl's:
Unable to Analyse Expression
Collections.disjoint(strAttributeMap[$attribute], $values) == false:
sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl cannot be cast
to java.lang.Class : [Rule name='hardConflictIsIn']
Unable to Analyse Expression
Collections.disjoint(strAttributeMap[$attribute], $values) == true:
sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl cannot be cast
to java.lang.Class : [Rule name='hardConflictNotIn']
at
org.drools.planner.config.solver.SolverConfig.buildRuleBase(SolverConfig.java:238)
at
org.drools.planner.config.solver.SolverConfig.buildSolver(SolverConfig.java:170)
at
org.drools.planner.config.XmlSolverConfigurer.buildSolver(XmlSolverConfigurer.java:103)
at
in.co.technovia.timetabler.TimeTableApp.createSolver(TimeTableApp.java:61)
at in.co.technovia.timetabler.TimeTableApp.main(TimeTableApp.java:45)
I got it from an answer from my own question at
http://stackoverflow.com/a/9241089/604511 . Is this a bug in Drools itself?
--
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14 years, 1 month
Re: [rules-users] Drools silently fails when I screw up
by ge0ffrey
barnesjd wrote
>
> Hi everyone. I'm new to Drools (using 5.2). I'm using it in Grails
> (2.0.1) with the drools-gorm plugin (0.5.6) (warning: Grails is also new
> for me). I've noticed that whenever I do something that is perhaps
> syntactically invalid, my rules simply don't fire. Given that I'm new to
> Drools, it would be nice if I could actually know what mistake I made.
>
> Are there some options I can use that will make Drools more vocal about my
> mistakes?
>
> Thanks!
> Joe
>
use knowledgebase.hasErrors()
--
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14 years, 1 month
Doubt when modifying facts on an action
by Zeta
Hi all,
my spreedsheet received 4 facts. I need all of them to check conditions but
not all of them are used in all rules. There are some rules that modify a
fact which is not used in any of the conditions and thus, it is not
"declared" on the left side of the rule.
Let me show you an example:
CONDITION CONDITION ACTION
Customer c Tariff t
name value
customer.setOffer($param)
RULE1 "pepe" 5 "lot of
offers"
RULE2 100 "lot of
offers"
When I try to compile this, I get a compilation error:
[ERROR] | 2012-03-14 17:21:30,238 |
es....ruleengine.impl.RuleEngineUpgradeImpl[RuleEngineUpgradeImpl.java:117]
| Rule Compilation error customer cannot be resolved
customer cannot be resolved
Any suggestion please?
Thanks,
Zoraida.-
--
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14 years, 1 month
Knowing which constraints are broken for final best solution in drools-planner
by maraoz
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!
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14 years, 1 month
Create a deep copy of KnowledgeAgent
by srinivasasanda
Hi One and All,
To over come from
Knowledge agent rebuilding knowledge base with scanner/notifier does not
work with declared fact caused
java.lang.ClassCastException when change rule condition and declarative
facts/events are used
1. I had a method which creates and loads the knowledge Agent.
2. I had a another method to execute rules which uses step 1 knowledge agent
(work on infinite loop)
3. Using knowledge Agent Event listener for method afterChangeSetApplied()
again i newly create and load knowledge agent.
4. while loading again got same error.
Note: Can u please help me to create deep copy of knowledge agent which
does not have references, i.e when i update rules the changes show not it
should not be affected it should run with old copy.
using java object clone method i can create deep copy but clone is not
available for Knowledge agent.
Thanks & Regards
Srinivasa sanda
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14 years, 1 month
Metadata in Guvnor-created rules
by Stephen Masters
Hi folks,
I'm curious about what metadata should be on a rule when created in Guvnor. I was assuming that any of the metadata fields shown under the "Attributes" tab should be available as metadata items when the rule gets activated. i.e. Title, categories, Created date, etc...
However, when I call event.getActivation().getRule().getMetaData() on an AfterActivationFiredEvent, the map returned is completely empty.
Or is the "metadata" for a rule in Guvnor not the same thing? I was rather hoping to be able to take note of the categories of each rule that fires.
fyi ... I'm using 5.3.0.Final.
Thanks for any assistance you can provide.
Steve
14 years, 1 month
