[rules-users] Dynamic Rules and Eval

[rrdh]

just basic Drools 5.5.0 Final


On Sun, Jul 14, 2013 at 8:40 PM, Wolfgang Laun <wolfgang.laun at gmail.com>wrote:

> Which Drools version do you use?
>
> On 14/07/2013, k <rrdh at gmx.net> wrote:
> > Hi,
> > basically it's the same problem this guy had
> >
> http://stackoverflow.com/questions/11485122/non-template-dynamic-rules-in-drools
> > <
> http://stackoverflow.com/questions/11485122/non-template-dynamic-rules-in-drools
> >
> >
> > , but the links in that question don't work.
> >
> > I'd like to dynamically add rules to a running session, but can use
> 'eval'
> > only in the very first one. If I add a second rule like the following, it
> > won't execute:
> >
> > ---
> >
> > String test2 =
> >   "\nrule id4" +
> >   "\nwhen" +
> >   "\neval(0 == 0)" + // if this eval is removed, "done2" is inserted
> >   "\nthen" +
> >   "\ninsertLogical( \"done2\" );" +
> >   "\nend";
> >
> > kbuilder.add(ResourceFactory.newByteArrayResource(test2.getBytes()),
> > ResourceType.DRL);
> >
> session.getKnowledgeBase().addKnowledgePackages(kbuilder.getKnowledgePackages());
> >
> > fired = session.fireAllRules();
> > System.out.println(fired); // 0
> > effects = session.getObjects();
> > assertTrue("fired", effects.contains("done2")); // fails
> >
> > ---
> >
> > You can see the complete Test at http://codetidy.com/6206/
> >
> > I'm also not sure if this is the correct way to dynamically add rules, so
> > please let me know, if there's a better way to add rules from strings.
> >
> > How can I dynamically add new rules to a running session and still use
> > eval?
> >
> >
> >
> > --
> > View this message in context:
> > http://drools.46999.n3.nabble.com/Dynamic-Rules-and-Eval-tp4024908.html
> > Sent from the Drools: User forum mailing list archive at Nabble.com.
> > _______________________________________________
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> >
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