[rules-users] Runtime addition of rules to a kbase

[Justin King]

Hi Edson, thanks for the response.

Are you sure about the no reusable kbuilder thing? If I dont reuse the same
one It does not work for me. Inserting the new rule has no effect.

Thanks,

Justin



2009/9/15 Edson Tirelli <tirelli at post.com>

>
>    Justin,
>
>    This is a valid use case and should work just fine. Just make sure you
> your a new kbuilder instance every time. KnowledgeBuilders should not be
> reused, but when you add the knowledge package to the knowledge base, Drools
> will merge packages as necessary.
>
>    If still not working, please add a testcase and create a JIRA and we
> will look into it.
>
>    []s
>    Edson
>
> 2009/9/9 Justin King <justin.matthew.king at gmail.com>
>
>> Hi,
>>
>> We have a project where we are attempting to add new rules to an existing
>> knowledgebase (read from a .drl file). We add them by using strings using
>> the following code:
>>
>> String rule = "rule \"GeneralClause-2\" " +
>>             "when " +
>>                 "ObligationComplianceEvent(term == \"term2\", obligation
>> == \"obligation1\", level == 2) " +
>>             "then " +
>>                 "System.out.println(\"GeneralClause-2\");" +
>>                 "contract1.setState(\"Hello\");" +
>>             "end";
>>
>>  Resource ruleResource = ResourceFactory.newReaderResource((Reader) new
>> StringReader(rule));
>>  kbuilder.add(ruleResource, ResourceType.DRL);
>>  kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
>>
>> We do not even halt the currently running session to add the new rule
>> (although halting and re-firing appears to make little difference). This
>> appears to have strange effects. Some rules (specifically those that use
>> 'accumulate' most of the time) will stop working after inserting the new
>> rule at runtime, even though they are completely unrelated. The timing in
>> which you add the new rule also seems to have an effect (e.g. before
>> inserting some events, after. etc). We cant seem to come to any logical
>> conclusion about the strange behavior our rules seem to give us.
>>
>> My question is this: Is this a valid way to use Drools? Or are we somehow
>> breaking something (perhaps the rete tree or something) behind the scenes by
>> doing this? If so, is there a correct way?
>>
>> Any input at all would be greatly appreciated as this is very critical to
>> our project.
>>
>> Cheers,
>>
>> Justin
>>
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>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>
>
> --
>  Edson Tirelli
>  JBoss Drools Core Development
>  JBoss by Red Hat @ www.jboss.com
>
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