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From "Henri Biestro (JIRA)" <>
Subject [jira] Commented: (JEXL-54) Light performance enhancements
Date Thu, 07 May 2009 18:22:45 GMT


Henri Biestro commented on JEXL-54:

I misread the dependencies, most notably java 1.4; I'll repost without the java 5 features

> Light performance enhancements
> ------------------------------
>                 Key: JEXL-54
>                 URL:
>             Project: Commons JEXL
>          Issue Type: Improvement
>    Affects Versions: 1.1
>            Reporter: Henri Biestro
>             Fix For: 2.0
>         Attachments: JEXL-54.patch
> The ClassMap.MethodCache uses String as key to methods; these keys are forged by concatenating
the name of the method & the argument classes names (converted to their object equivalent
for primitive types). Replacing the key scheme & using a dedicated class to implement
the keys yields some performance improvement. (aka 3x faster to get from a map).
> The MethodMap uses an HashTable; by synchronizing MethodMap.{add,get} and synchronizing
ClassMap.{get,put} on its MethodMap instance, it is possible to use a basic HashMap instead.
> There are various places where a StringBuffer is used when a StringBuilder will suffice.
> As a side note, there are a few places where the code readability can be improved by
using strongly typed collections.
> As a small "missing" feature, exposing access to the Introspector from the Uberspector
(Introspector getIntrospector()) allows to re-use JEXL for some lower level introspection

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