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

[Edson Tirelli]

   Yes, once you do:

kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());

   Throw away your kbuilder and use a new one to add new rules. Obviously,
keep the same kbase.

   []s
   Edson


2009/9/14 Justin King <justin.matthew.king at gmail.com>

> 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
>>>
>>> _______________________________________________
>>> rules-users mailing list
>>> rules-users at lists.jboss.org
>>> 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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>>
>>
>
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-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss by Red Hat @ www.jboss.com
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