[rules-users] Dynamic Rules and Eval

[Wolfgang Laun]

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?
>
>
>
> --
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> http://drools.46999.n3.nabble.com/Dynamic-Rules-and-Eval-tp4024908.html
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