[Newbies] #Schedule - How to Use?

Sat Jun 29 00:13:13 UTC 2019

DavidTL,

Thanks for your feedback!  64 bit #Delay does have a much broader range
than what is indicated on the Wiki. Your suggestion about using #Scheduler
sounds good and there must be a compelling reason to use it over #Delay;
why else go to the effort to create a new class? I have it installed in my
image now and learning how to use it.

-jrm

On Thu, Jun 27, 2019 at 7:36 PM David T. Lewis <lewis at mail.msen.com> wrote:

> On Thu, Jun 27, 2019 at 07:00:08PM -0700, John-Reed Maffeo wrote:
> > David,
> >
> > Thank you! Your observation about #Schedule, it seems to be correct. I
> have
> > been trying things out since I sent my original question and came to the
> > same conclusion,  it just builds a collection of #DateAndTime objects
> which
> > may be useful in conjunction with #Delay.
> >
> > Some tests with #Delay in a current 64 bit image produce results which
> > produce results which exceed the limit of ~six days which I mentioned in
> my
> > original post. I got the limit from the Delay
> > <http://wiki.squeak.org/squeak/3134> entry on the Squeak Wiki.
>
> It is quite possible that the six day limit goes away on a 64 bit
> image (I did not check) because SmallInteger is not small any more :-)
>
> As a side note, you can delay for 365 days like this:
>
>   d := 1 day asDelay.
>   365 timesRepeat: [ d wait ].
>
> But relying on long delays to execute a schedule does not sound like
> a very good idea anyway, so the Scheduler package by John Pierce sounds
> like a good tip.
>
> If you are concerned with tracking daylight savings time changes in
> your schedules, the TZ-Olson package on SqueakMap may be useful (latest
> Squeak trunk only).
>
> Dave
>
>
> >
> > So I have two options to investigate now #Delay and #Scheduler.
> >
> > Thanks for looking up Torsten's version. I had seen a mention of it, but
> I
> > was trying to stay within the bounds of a standard release. I will take a
> > look.
> >
> > Regards,
> >
> > -jrm
> >
> > P.S. For someone who has been away from Squeak for a long time, you still
> > have very good advice to share :-)
> >
> > On Thu, Jun 27, 2019 at 6:34 PM David Shaffer <cdshaffer at acm.org> wrote:
> >
> > > I???ve been away from Squeak for a long time but I don???t think
> Schedule does
> > > what you want.  I browsed the code a bit and it seems to be more about
> > > /storing/ a schedule rather than /executing/ one.
> > >
> > > John Pierce wrote a package called Scheduler which I used with great
> > > success many (many) years ago.  The SqueakMap entry still exists but
> the
> > > file links are dead.  I have attached my latest version of that
> package.  I
> > > tried it out in Squeak 5.2 and it seemed to work but I can???t make any
> > > promises.  I don???t think it will have the same problems as a long
> Delay
> > > since its main loop seems to check for runnable tasks every 1/4 second.
> > >
> > > The SqueakMap page has some docs:
> > > http://map.squeak.org/package/cb344d5b-c810-45cd-a440-534d900aacfd
> > >
> > > BTW, to load the MCZ you can use the File List (under Tools).
> > >
> > > Best,
> > >
> > > David
> > >
> > >
> > > On Jun 24, 2019, at 5:16 PM, John-Reed Maffeo <jrmaffeo at gmail.com>
> wrote:
> > >
> > > I am working on an application which requires task scheduler like cron
> on
> > > UNIX or Task Manager on Windows. In the swiki , there is a page about
> Refactored
> > > Date and Time Classes <http://wiki.squeak.org/squeak/1871> which
> mentions
> > > #Schedule in the context of TV programs. I have figured out how to set
> up,
> > > but I can not figure out how to use it productively.
> > >
> > > My simple use case is:
> > > a. create an instance of #Schedule
> > > b. Use the schedule to write a string to the Transcript based on the
> > > contents of the schedule.
> > >
> > >
> > > |sampleSchedule  rightNow cr |
> > >
> > > rightNow := DateAndTime now.
> > > cr := String cr.
> > >
> > > sampleSchedule := Schedule starting: rightNow  ending: rightNow + 20
> > > minutes .
> > >
> > > sampleSchedule schedule: {Duration minutes: 1. Duration minutes: 3}.
> > > sampleSchedule  scheduleDo:[:each |Transcript show: each asString,
> String
> > > cr].
> > > >> This results in all of the schedule items being written to the
> > > Transcript immediately, rather at the schedule time for each.
> > >
> > > How to I use a schedule to run a block at the time specified by the
> > > schedule.
> > >
> > > I have looked at #Delay, but it has a limit of ~six days which will not
> > > work for me.
> > >
> > > Thanks,
> > >
> > > -jrm
> > >
> > >
> > >
> > >
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