[Newbies] #Schedule - How to Use?

[John-Reed Maffeo]

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.

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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