So there are a few scheduling libraries around, I wanted one for cron-like
job scheduling and my options were quite limited, there are things like
clj-cronlike and quartzite but I found the syntax quite clunky and didn't
like the central stateful scheduler idea. There are also things like at-at,
but that's more for events recurring over seconds/minutes or one-shot
events, so that was out too.
In the end I wrote my own library. It's tiny (~60 lines) and does one task
quite well. It's modelled after futures, and in fact returns a future, so
use it in the same places/way you might use a future, but for recurring
events.
To schedule things, it's like a cron setup (so by default fires every
minute of every hour of every day...) but you can pass a map of times when
it should fire, so for example {:minute [0 15 30 45] :day :tue} will fire
every 15 minutes on a tuesday where {:hour 9} will fire every minute from
9-10am every day. Beyond that you simply call schedule with pairs of
schedule maps to functions which should fire.
Example:
=> (def my-running-scheduler
(schedule {:hour 12 :minute [0 15 30 45]} my-function
{:hour (range 0 24 6) :minute 0 :day [:sat :sun]} batch-job))
...
=> (future-cancel my-running-scheduler)
Simple as that.
Like I say, this was to scratch my own itch, but if anyone else finds it
useful, great. If it nearly does what you want but not quite... hey, it's
only 60 lines, fork it/fix it. If anyone has suggestions for features,
bugfixes or other libraries I should be contributing this code to instead,
that would be useful knowledge too.
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