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Posted to log4j-dev@logging.apache.org by "Remko Popma (JIRA)" <ji...@apache.org> on 2017/02/02 06:26:51 UTC
[jira] [Created] (LOG4J2-1805) FixedDateFormat improvements
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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