[jira] Closed: (LANG-478) StopWatch does not resist to system time changes

["Henri Yandell (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LANG-478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Henri Yandell closed LANG-478.
------------------------------

    Resolution: Fixed

svn ci -m "Applying my patch from LANG-478 - moving StopWatch to using nanoTime under the hood. "

Sending        src/java/org/apache/commons/lang/time/StopWatch.java
Transmitting file data .
Committed revision 749114.

> StopWatch does not resist to system time changes
> ------------------------------------------------
>
>                 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
>             Fix For: 3.0
>
>         Attachments: LANG-478.patch
>
>
> 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, should the system time change consist in a backward adjustment, the difference could 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 appropriate factor, of course.
> Thanks a lot,
> Regis.

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