[jira] Closed: (FELIX-2804) [Framework] Try to improve performance of parseDelimitedString() in manifest parser

["Richard S. Hall (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FELIX-2804?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Richard S. Hall closed FELIX-2804.
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       Resolution: Won't Fix
    Fix Version/s:     (was: framework-3.2.0)

I did various experiments including synchronizing the StringBuffer and avoiding the StringBuffer altogether by just using index calculation. I did significant improvement with index calculation for a handful of runs, but any significant number of runs it didn't make a difference. For example, I saw no difference when starting GF.

> [Framework] Try to improve performance of parseDelimitedString() in manifest parser
> -----------------------------------------------------------------------------------
>
>                 Key: FELIX-2804
>                 URL: https://issues.apache.org/jira/browse/FELIX-2804
>             Project: Felix
>          Issue Type: Improvement
>          Components: Framework
>    Affects Versions: framework-3.0.7
>            Reporter: Richard S. Hall
>            Priority: Minor
>
> Currently, we are using StringBuffer and appending one character at a time while parsing a delimited string. As we discovered when implementing our custom manifest parser, such an approach is not really very efficient. It is better to keep track of beginning/ending indexes and just extracting strings as needed. We should probably do something similar here. It may not offer great improvement, but this routine is used to parse pretty long import/export headers, so you never know.

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