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https://issues.apache.org/jira/browse/MIME4J-5?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oleg Kalnichevski updated MIME4J-5:
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Attachment: mime4j.patch
Folks
I am attaching for your consideration a patch that resolves the greatest
perforce bottleneck in the mime4j parsing framework by improving the way the
parser scans for mime boundaries in data streams
According my (very unscientific) tests the patch improves parsing performance
by almost as much as 10 times
52KB file with 3 large attachments, 5000 repetitions: 28.618s before, 3.34 after
I did not want to change too many things in too many places at the same time. I
mostly concentrated on fixing MimeBoundaryInputStream as the first essential
step. As a result I had to hack the Cursor related stuff quick and dirty just
to make it stick. The code in MimeTokenStream class got somewhat uglier. I am
willing to continue improving mime4j parsing code if this patch and the overall
approach get approved. I could also port MIME field parsing code from HttpCore
to resolve the last case of one byte read in mime4j if you want.
All existing test cases pass for me.
Please review the patch and let me know what you think.
Oleg
> Mime4j takes really long to parse big messages
> ----------------------------------------------
>
> Key: MIME4J-5
> URL: https://issues.apache.org/jira/browse/MIME4J-5
> Project: Mime4j
> Issue Type: Bug
> Affects Versions: 0.3
> Reporter: Norman Maurer
> Assignee: Niklas Therning
> Fix For: 0.4
>
> Attachments: mime4j.patch
>
>
> From ml:
> Mime4j has general demonstrable performance problems:
> http://buni.org/bugzilla/show_bug.cgi?id=137
> http://blog.buni.org/blog/mbarker/Meldware/2007/01/27/Look-out-Its-behind-you
> I'd suggest a general code review for the "byte at a time + buffered input
> stream" anti-pattern
> and general refactoring to do things in blocks where possible.
> -Andy
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