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https://issues.apache.org/jira/browse/MIME4J-298?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benoit Tellier closed MIME4J-298.
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Resolution: Fixed
> DateTimeFieldLenientImpl: Migrate from SimpleDateFormat to DateTimeFormatter
> ----------------------------------------------------------------------------
>
> Key: MIME4J-298
> URL: https://issues.apache.org/jira/browse/MIME4J-298
> Project: James Mime4j
> Issue Type: Improvement
> Components: dom
> Affects Versions: 0.8.5
> Reporter: Benoit Tellier
> Priority: Major
> Fix For: 0.8.6
>
> Attachments: MIME4J-298-cpu.png, MIME4J-298-mem.png
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> SimpleDateFormat is instanciated for each invocation of
> DateTimeFieldLenientImpl::parse because SimpleDateFormat is not thread safe.
> Using DateTimeFormatter would allow us to initialize it once at class-loading
> time.
> Furthermore we should order the time formats so that the most frequents show
> up first, limiting the total count of parsing passes.
> A simple flame graph study showed date parsing represents 20% of the CPU time
> when computing a MessageFastView projection, almost comparable to the full
> header parsing... I would like to lower that CPU time!
> Reopen of https://issues.apache.org/jira/browse/JAMES-3584 on the right bug
> tracker.
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