StopWatch does not resist to system time changes
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Key: LANG-478
URL: https://issues.apache.org/jira/browse/LANG-478
Project: Commons Lang
Issue Type: Bug
Affects Versions: 2.3
Environment: all operating systems.
Reporter: Regis Desgroppes
org.apache.commons.lang.time.StopWatch seems to be relying on wall clock, i.e.
by calling java.lang.System.currentTimeMillis() to sample current time.
When a system time change occurs (user action, NTP synchronization...) between
2 calls to StopWatch.getTime(), the difference between the 2 samples is wrong:
the measured duration may noticeably differ from the real one. Moreover, if the
system time change consists in a backward adjustment, the difference may be
negative.
In order to make StopWatch resistant to system time changes, would it be
possible to use the process time, i.e. by making implementation calling
java.lang.System.nanoTime() -multiplied by 1000, of course-.
Thanks a lot,
Regis.
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