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From "Henri Biestro (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (JEXL-186) Performance regression in arithmetic operations compared to JEXL 2.1
Date Fri, 22 Jan 2016 17:06:40 GMT

    [ https://issues.apache.org/jira/browse/JEXL-186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15112694#comment-15112694
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Henri Biestro commented on JEXL-186:
------------------------------------

Correcting arithmetic operator overloading caching / discovery
src/main/java/org/apache/commons/jexl3/internal/introspection/Uberspect.java
Committed revision 1726257.


> Performance regression in arithmetic operations compared to JEXL 2.1
> --------------------------------------------------------------------
>
>                 Key: JEXL-186
>                 URL: https://issues.apache.org/jira/browse/JEXL-186
>             Project: Commons JEXL
>          Issue Type: Bug
>    Affects Versions: 3.0
>            Reporter: Henri Biestro
>             Fix For: Later
>
>
> Compared to JEXL 2.1.1, arithmetic operations are slower in 3.0.
> The culprit is the logic around operators overloading; when the JexlArithmetic does not
overload any operator, discovering whether it overloads one is repeated each time an interpreter
is created (which is a costly introspection operation).
> As a workaround, one ca use an arithmetic that does overload an operator (for instance
size) as in:
> {code}
>     public static class JMeterArithmetic extends JexlArithmetic {
>         public JMeterArithmetic(boolean astrict) {
>             super(astrict);
>         }
>         /**
>          * A workaround to create an operator overload
>          * @param jma an improbable parameter class
>          * @return 1
>          */
>         public int size(JMeterArithmetic jma) {
>             return 1;
>         }
>     }
> {code}
> And use an instance of that class at engine creation time as in:
> {code}
>         JexlEngine jexl = new JexlBuilder()
>                     .cache(512)
>                     .silent(true)
>                     .strict(true)
>                     .arithmetic(new JMeterArithmetic(true))
>                     .create();
> {code}



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