Remko Popma created LOG4J2-1805:
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Summary: 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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