Queue and cron.
A stupid Ruby cron thread that wakes up from time to time to perform according to what's written in a crontab.
Given etc/qrontab_dev:
@reboot p [ :hello, "just started" ]
* * * * * p [ :hello, :min, Time.now ]
* * * * * * p [ :hello, :sec, Time.now ]
and
require 'qron'
q = Qron.new(tab: 'etc/qrontab_dev')
q.join[:hello, :sec, 2025-03-23 15:39:56.558783631 +0900]
[:hello, :sec, 2025-03-23 15:39:57.368985197 +0900]
[:hello, :sec, 2025-03-23 15:39:58.308865845 +0900]
[:hello, :sec, 2025-03-23 15:39:59.209102149 +0900]
[:hello, :min, 2025-03-23 15:40:00.149162785 +0900]
[:hello, :sec, 2025-03-23 15:40:00.149290935 +0900]
[:hello, :sec, 2025-03-23 15:40:01.039228675 +0900]
(...)
Uses fugit for cron parsing and stagnum as its worker pool.
A little brother to rufus-scheduler.
It's OK to use timezones in the qrontab file:
30 * * * * Asia/Tokyo p [ :tokyo, :min, Time.now ]
30 4 1,15 * 5 Europe/Budapest p [ :budapest, :min, Time.now ]
MIT, see LICENSE.txt