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From "Remko Popma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4J2-1805) FixedDateFormat improvements
Date Thu, 02 Feb 2017 07:23:53 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-1805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15849569#comment-15849569

Remko Popma commented on LOG4J2-1805:

They're not: this is about the FixedDateFormat, not about the commons-lang FastDateFormat.

FixedDateFormat is our custom high performance and garbage free formatter for the fixed formats
we have names for in the docs for the %d converter. The commons-lang stuff is called FastDateFormat
and is used for any format that doesn't match the predefined fixed formats. 

The names can get a bit confusing, I agree. 

> FixedDateFormat improvements
> ----------------------------
>                 Key: LOG4J2-1805
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1805
>             Project: Log4j 2
>          Issue Type: Improvement
>          Components: Pattern Converters
>    Affects Versions: 2.6
>            Reporter: Remko Popma
>            Assignee: Remko Popma
>             Fix For: 2.8.1
> *Proposed changes:*
> * improve thread-safety of {{FixedDateFormat::updateMidnightMillis}}
> * expose {{FixedDateFormat::millisSinceMidnight}} as a public method
> In multi-threaded scenarios where time does not move forward monotonically, the implementation
of {{FixedDateFormat::updateMidnightMillis}} can result in corrupted time stamps. In a project
I am involved in we have a custom PatternConverter that uses FixedDateFormat to format the
"event time". In these (artificial) tests, event time does not always move forward, so the
{{updateMidnightMillis}} is called concurrently with varying values. This is not a production
issue, but the implementation can be improved to be thread-safe without impacting performance
by using double-checked locking.
> Making {{FixedDateFormat::millisSinceMidnight}} public would provide a performant and
convenient way to strip off the date component. Useful for systems that are on Java 7 or for
systems on Java 8 that don't want to construct a {{LocalTime}} object every time this value
is required.

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