Re: [milo-dev] [Q] How to keep the specified sampling interval accuratel

[Shigeru Ishida <ishida_shigeru@xxxxxxxxxxx>]

Hi Kevin,

Although it is not sophisticated, I tried implementing it.
I got the performance I expected, so I will finish the work.
Thank you for the tips.

--Shigeru

<ishida_shigeru@xxxxxxxxxxx> wrote, Wed, 01 Nov 2017 09:00:25 +0900 (JST)

> OK. However, it seems to be a hard work.
> Anyway, thank you.
> 
> <kevinherron@xxxxxxxxx> wrote, Tue, 31 Oct 2017 04:57:03 -0700
> 
> > SubscriptionModel is only meant to server as a naive example of how you
> > might sample your underlying data source.
> > 
> > I expect users to implement their own more sophisticated approach to
> > sampling. Ideally, one that accurately tracks how long sampling took and
> > can adjust its next execution, as you suggest, and also samples the data
> > without resorting to calling read() on the namespace.
> > 
> > At work, our underlying data sources are PLCs, so I've developed a
> > "RequestExecutor" system that handles scheduling these requests to the PLC
> > and accounts for the latency of each request as it re-schedules the next
> > execution. I'm not able to open source this work right now, but it's not
> > all that complicated to build on your own.
> > 
> > On Mon, Oct 30, 2017 at 9:34 PM, Shigeru Ishida <ishida_shigeru@xxxxxxxxxxx>
> > wrote:
> > 
> > > Hi Kevin,
> > >
> > > Is there a way to keep the specified sampling interval accurately
> > > when developing a server ? For example, when 100 (msec) is specified,
> > > it took 110 (msec), so the next sampling is done at 90 (msec).
> > >
> > > Looking at the code of SubscriptionModel.java, it seems difficult
> > > because it uses ScheduledExecutorService.
> > >
> > > Regards,
> > >
> > > --Shigeru
> > > _______________________________________________
> > > milo-dev mailing list
> > > milo-dev@xxxxxxxxxxx
> > > To change your delivery options, retrieve your password, or unsubscribe
> > > from this list, visit
> > > https://dev.eclipse.org/mailman/listinfo/milo-dev