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 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@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@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 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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