Re: [rules-users] Problem with Banking Tutorial
IIRC, this was a bug one or two minor versions ago. What version are you using?
-W
On 18/04/2013, Stefan Schuster <stefan.m.schuster(a)gmail.com> wrote:
For the sake of completeness, here is also the RuleRunner class used
in
this example:
package org.drools.tutorials.banking;
import java.util.Collection;
import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseFactory;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderFactory;
import org.drools.builder.ResourceType;
import org.drools.definition.KnowledgePackage;
import org.drools.io.ResourceFactory;
import org.drools.runtime.StatefulKnowledgeSession;
public class RuleRunner {
public RuleRunner() {
}
public void runRules(String[] rules,
Object[] facts) {
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder();
for ( int i = 0; i < rules.length; i++ ) {
String ruleFile = rules[i];
System.out.println( "Loading file: " + ruleFile );
kbuilder.add( ResourceFactory.newClassPathResource( ruleFile,
RuleRunner.class ),
ResourceType.DRL );
}
Collection<KnowledgePackage> pkgs =
kbuilder.getKnowledgePackages();
kbase.addKnowledgePackages( pkgs );
StatefulKnowledgeSession ksession =
kbase.newStatefulKnowledgeSession();
for ( int i = 0; i < facts.length; i++ ) {
Object fact = facts[i];
System.out.println( "Inserting fact: " + fact );
ksession.insert( fact );
}
ksession.fireAllRules();
}
}
2013/4/18 Stefan Schuster <stefan.m.schuster(a)gmail.com>
> Hello,
>
> I have a problem with the banking tutorial number 3, which is part of the
> examples of drools expert.
> It simply adds some Numbers as facts, and retracts them in an increasing
> order.
>
> It is very short, therefore I post the whole Code:
>
>
> BankingExample3.java
> _________________________________________________
> package org.drools.tutorials.banking;
>
> public class BankingExample3 {
> public static void main(String[] args) {
> Number[] numbers = new Number[] {wrap(3), wrap(1), wrap(4),
> wrap(1), wrap(5)};
> new RuleRunner().runRules( new String[] { "Example3.drl" },
> numbers );
> }
>
> private static Integer wrap(int i) {
> return new Integer(i);
> }
> }
> _________________________________________________
>
>
>
> Example3.drl:
> _________________________________________________
> package org.drools.tutorials.banking
>
> rule "Rule 01"
> when
> $number : Number()
> not Number( intValue < $number.intValue )
> then
> System.out.println("Number found with value: " +
> $number.intValue() );
> retract( $number );
> end
> _________________________________________________
>
>
> Output:
> _________________________________________________
> Loading file: Example3.drl
> Inserting fact: 3
> Inserting fact: 1
> Inserting fact: 4
> Inserting fact: 1
> Inserting fact: 5
> Number found with value: 1
> Number found with value: 1
> Number found with value: 3
> Number found with value: 4
> Number found with value: 5
> _________________________________________________
>
>
> that seams absolute logically to me.
> But now I alter the Numbers in the Java-Part:
> Number[] numbers = new Number[] {wrap(3), wrap(1), wrap(2)};
>
> and the output destroys everything I thought I understood:
> Loading file: Example3.drl
> Inserting fact: 3
> Inserting fact: 1
> Inserting fact: 2
> Number found with value: 1
> Number found with value: 3
> Number found with value: 2
>
>
> Can someone reproduce this behavior?? It seams absolutely strange to me.
> I would have expected the order 1,2,3. Any explanations?
>
> Thanks in advance for helping me!
>
>
>