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From "Carsten Ziegeler (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (FELIX-2605) FilterHandler should pre-compile regular expression
Date Tue, 21 Sep 2010 07:55:33 GMT

     [ https://issues.apache.org/jira/browse/FELIX-2605?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Carsten Ziegeler resolved FELIX-2605.

    Fix Version/s: http-2.0.6
       Resolution: Fixed

Thanks for your patch, David, I've applied a slightly modified version in revision: 999261

> FilterHandler should pre-compile regular expression
> ---------------------------------------------------
>                 Key: FELIX-2605
>                 URL: https://issues.apache.org/jira/browse/FELIX-2605
>             Project: Felix
>          Issue Type: Improvement
>          Components: HTTP Service
>    Affects Versions: http-2.0.4
>            Reporter: David Hay
>            Assignee: Carsten Ziegeler
>             Fix For: http-2.0.6
>         Attachments: FilterHandler.java-regexp.patch
> The implementation of FilterHandler has a potential performance problem.  Each time the
"handle" method is called, it goes through a matching process that includes the following
> return uri.matches(this.pattern)
> The problem is that this compiles the regular expression every time this method is called,
a potentially expensive operation.
> The pattern should be compiled using Pattern.compile and then re-used for each call to
"matches" as follows:
> return this.regex.matcher(uri).matches();

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