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Re: Problem with Swing Ti

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  Re: Problem with Swing Ti "John B. Matthews" <john.b..matthews@THRWHITE.remove-dii-this> - 2011-04-27 15:47 +0000

#3937 — Re: Problem with Swing Ti

  To: comp.lang.java.gui
In article <489dc941$0$4017$b9f67a60@news.newsdemon.com>,
 Knute Johnson <nospam@rabbitbrush.frazmtn.com> wrote:

> Larry A Barowski wrote:
> > <ifarberov@lsplab.com> wrote in message 
> > news:3f05236e-f599-41ec-9ac9-2ff561d6b7b9@s50g2000hsb.googlegroups.com...
> >> After reading some of the above suggestions I have developed a new 
> >> theory of what may be going on.  It seems that if a computer clock 
> >> is adjusted backwards while swing timer is used, the timer stops 
> >> firing action events.  And as a matter of fact my program does 
> >> speed up system clock.  Once in a while the computer clock in 
> >> syncronized with the network clock, which may push my computer 
> >> clock back.
> > 
> > Just write your own timer and timer queue classes using
> > nanoTime() and the nano version of wait().
> > 
> I think that's going to have the same problem is she changes the 
> system clock.

Yes, particularly if the clock is stepped backward. It should be 
possible to use ntp to adjust the local clock in a manner that mitigates 
this, assuming the local network has (or allows access to) suitable time 
sources:

<http://en.wikipedia.org/wiki/Network_Time_Protocol>
<http://en.wikipedia.org/wiki/Clock_synchronization>
<http://www.ntp.org/>

"Under ordinary conditions, ntpd slews the clock so that the time is 
effectively continuous and never runs backwards." In practice, a clock 
that's way off may take a long time to adjust at the nominal slew rate, 
which is limited to 0.5 ms/s. Starting ntpd with -g is a reasonable 
alternative:

<http://www.ece.udel.edu/~mills/ntp/html/ntpd.html>

-- 
John B. Matthews
trashgod at gmail dot com
home dot woh dot rr dot com slash jbmatthews

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