[rules-users] Problem using BatchExecutionCommand - appears to process same command repeatedly

[Wolfgang Laun]

You assume that the bundling of insertions by lists l1 and l2 ist magically
reflected
by the way rule "Is of valid age" matches the facts. This is not so.

After the insertions, we have one Phillip, one Joe and two unidentified
Applications.

The rule selects young Joe and any Application so that with one Joe and two
Apps you see two firings.

It is essential to relate an Application to its Applicant which is usually
done by
making the latter an attribute of the former so that you can write

rule x
when
      $app: Applicant( age < 18 )
       $a : Application( applicant == $app )
then

-W


On 21 March 2012 18:15, Rhodes, Phil <prhodes at mesirowfinancial.com> wrote:

> 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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