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@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 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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