[rules-users] 答复: MVEL performance penalty

[Wolfgang Laun]

I was careful to start a new thread with an appropriate subject that (I
think) indicates that MVEL causes trouble. The boldface sentence says that
dialect MVEL executes two calls where dialect Java succeeds with a single
call.

(I don't think that the original poster really saw an "optimization".)

-W


2012/1/5 Zhuo Li <milanello1998 at gmail.com>

>  Hi, Laun,****
>
> ** **
>
> I might be dull but what does this indicate? Drools did OPTIMIZE MVEL
> dialect? But call it twice means optimization?****
>
> ** **
>
> Best****
>
> Abe****
>
> ** **
>
> *发件人:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *代表 *Wolfgang Laun
> *发送时间:* 2012年1月5日 16:53
> *收件人:* Rules Users List
> *主题:* [rules-users] MVEL performance penalty****
>
> ** **
>
> Drools 5.3.0 FINAL.
>
> This experiment was inspired by code posted with the insinuation that MVEL
> would "optimize" condition evaluation. - Consider this rule:
>
> rule "Term - java"
> dialect "java"
> when
>    $ea : EasyApp( Test.valueInList( $ea.getProductCode(), "CAR" )==true
>                   && age < 0 )
> then end
>
> You'd expect that Test.valueInList() is called once per inserted EasyApp
> fact, and this can be verified easily. - Now the same rule, with MVEL's
> syntactic sugar:
>
> rule "Term  - mvel"
> dialect "mvel"
> when
>     $ea : EasyApp( Test.valueInList( productCode, "CAR" )==true
>                    && age < 0 )
> then end
>
> *Now Test.valueInList() is called twice for each inserted fact.*
>
> Cheers
> Wolfgang
>
> ****
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20120105/f748edf4/attachment.html