Re: [rules-users] RuleBase Question
OK. The reason why I don't want to use KnowledgeAgent is because I want the DRL scanning to be done synchronously once I send a JMX message and not by having the KnowledgeAgent polls the resource folder for changes every x time units. Can I do that? Basically, I want another application to send a signal to start scanning the DRL folder for changed files and then compile and re-add only those that have been modified. I am currently using the file modification time to determine what has changed since last time. Is there a better approach? Right now I have a JMX bean that scans the folder, and grabs the DRLs that got changed, and only recompile those, then re-add them to the RuleBase, then get a new stateful session the next execution. -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/RuleBase-Question-tp887326p889922.html Sent from the Drools - User mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] RuleBase Question
Thanks Esteban,
1. I will try that.
2. No, I did not use queries. They are just rules that use functions in my
fact object.
2010/6/11 Esteban Aliverti
> Hi,
>
> 1. If you want to dynamically update your kbase whenever your resources
> (DRL, PKG, etc) change, you could use Knowledge Agent. Take a look at the
> documentation. The KAgent basically makes what you are trying to do. On
> thing you must to take care (whether you are using KAgent or not) is that
> whenever you modify a kbase you must rebuild all your sessions (unless they
> were stateless, of course).
>
> 2. Does the package you are trying to remove contains queries definitions?
> I filled a jira issue some time ago (
> https://jira.jboss.org/browse/JBRULES-2374) reporting this problem.
>
> Best,
>
>
> On Thu, Jun 10, 2010 at 9:43 PM, malkhafaji wrote:
>
>>
>> Hello,
>>
>> I have two questions. Hopefully they are very simple:
>>
>> 1. If I wanted to dynamically update a package in the RuleBase because I
>> found out that the drl was updated on disk, can I just do this:
>>
>> ruleBase.addPackage(myPackage);
>>
>> And this will automatically replace (remove the old one, and add the new
>> one)? Or do I have to implicitly first remove the existing one and THEN
>> add
>> the modified one again?
>>
>> I have the following code:
>>
>> if (ruleBase.getPackage(onePackage.getName()) != null) {
>>ruleBase.removePackage(onePackage.getName());
>> }
>> ruleBase.addPackage(onePackage);
>>
>> Is this a code practice to do?
>>
>> 2. My second question is, the statement above in the body of the IF block,
>> threw the following exception:
>>
>> Exception in thread "AdminHandler_0_123877285495354"
>> java.lang.NullPointerException
>> INFO|7032/0|10-06-10 13:43:55| at
>> org.drools.reteoo.ReteooBuilder.removeRule(ReteooBuilder.java:235)
>> INFO|7032/0|10-06-10 13:43:55| at
>> org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java:413)
>> INFO|7032/0|10-06-10 13:43:55| at
>> org.drools.common.AbstractRuleBase.removeRule(AbstractRuleBase.java:729)
>> INFO|7032/0|10-06-10 13:43:55| at
>>
>> org.drools.common.AbstractRuleBase.removePackage(AbstractRuleBase.java:657)
>> INFO|7032/0|10-06-10 13:43:55| at [statement in the IF block above]
>>
>> Any ideas why that is?
>>
>> Thanks.
>> --
>> View this message in context:
>> http://drools-java-rules-engine.46999.n3.nabble.com/RuleBase-Question-tp887326p887326.html
>> Sent from the Drools - User mailing list archive at Nabble.com.
>> ___
>> rules-users mailing list
>> rules-users@lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>
>
>
> --
>
>
> Esteban Aliverti
>
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Re: [rules-users] RuleBase Question
Hi,
1. If you want to dynamically update your kbase whenever your resources
(DRL, PKG, etc) change, you could use Knowledge Agent. Take a look at the
documentation. The KAgent basically makes what you are trying to do. On
thing you must to take care (whether you are using KAgent or not) is that
whenever you modify a kbase you must rebuild all your sessions (unless they
were stateless, of course).
2. Does the package you are trying to remove contains queries definitions? I
filled a jira issue some time ago (
https://jira.jboss.org/browse/JBRULES-2374) reporting this problem.
Best,
On Thu, Jun 10, 2010 at 9:43 PM, malkhafaji wrote:
>
> Hello,
>
> I have two questions. Hopefully they are very simple:
>
> 1. If I wanted to dynamically update a package in the RuleBase because I
> found out that the drl was updated on disk, can I just do this:
>
> ruleBase.addPackage(myPackage);
>
> And this will automatically replace (remove the old one, and add the new
> one)? Or do I have to implicitly first remove the existing one and THEN add
> the modified one again?
>
> I have the following code:
>
> if (ruleBase.getPackage(onePackage.getName()) != null) {
>ruleBase.removePackage(onePackage.getName());
> }
> ruleBase.addPackage(onePackage);
>
> Is this a code practice to do?
>
> 2. My second question is, the statement above in the body of the IF block,
> threw the following exception:
>
> Exception in thread "AdminHandler_0_123877285495354"
> java.lang.NullPointerException
> INFO|7032/0|10-06-10 13:43:55| at
> org.drools.reteoo.ReteooBuilder.removeRule(ReteooBuilder.java:235)
> INFO|7032/0|10-06-10 13:43:55| at
> org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java:413)
> INFO|7032/0|10-06-10 13:43:55| at
> org.drools.common.AbstractRuleBase.removeRule(AbstractRuleBase.java:729)
> INFO|7032/0|10-06-10 13:43:55| at
> org.drools.common.AbstractRuleBase.removePackage(AbstractRuleBase.java:657)
> INFO|7032/0|10-06-10 13:43:55| at [statement in the IF block above]
>
> Any ideas why that is?
>
> Thanks.
> --
> View this message in context:
> http://drools-java-rules-engine.46999.n3.nabble.com/RuleBase-Question-tp887326p887326.html
> Sent from the Drools - User mailing list archive at Nabble.com.
> ___
> rules-users mailing list
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> https://lists.jboss.org/mailman/listinfo/rules-users
>
--
Esteban Aliverti
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[rules-users] RuleBase Question
Hello,
I have two questions. Hopefully they are very simple:
1. If I wanted to dynamically update a package in the RuleBase because I
found out that the drl was updated on disk, can I just do this:
ruleBase.addPackage(myPackage);
And this will automatically replace (remove the old one, and add the new
one)? Or do I have to implicitly first remove the existing one and THEN add
the modified one again?
I have the following code:
if (ruleBase.getPackage(onePackage.getName()) != null) {
ruleBase.removePackage(onePackage.getName());
}
ruleBase.addPackage(onePackage);
Is this a code practice to do?
2. My second question is, the statement above in the body of the IF block,
threw the following exception:
Exception in thread "AdminHandler_0_123877285495354"
java.lang.NullPointerException
INFO|7032/0|10-06-10 13:43:55| at
org.drools.reteoo.ReteooBuilder.removeRule(ReteooBuilder.java:235)
INFO|7032/0|10-06-10 13:43:55| at
org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java:413)
INFO|7032/0|10-06-10 13:43:55| at
org.drools.common.AbstractRuleBase.removeRule(AbstractRuleBase.java:729)
INFO|7032/0|10-06-10 13:43:55| at
org.drools.common.AbstractRuleBase.removePackage(AbstractRuleBase.java:657)
INFO|7032/0|10-06-10 13:43:55| at [statement in the IF block above]
Any ideas why that is?
Thanks.
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