Schedule Tasks on Common lisp (cl-cron)

#lisp #commonlisp #cron #clcron #sbcl

Library cl-cron

cl-cron is a simple cron like library that allows you to set up cron-like jobs and run them at predetermined times. The library has been tested on SBCL so far.

To see the documentation or download the file goto http://quickdocs.org/cl-cron/api

https://www.cliki.net/cl-cron

Installation
We suggest using quicklisp for installation.

(ql:quickload "cl-cron")

(in-package :cl-cron)

Scheduling explained

    - minute (from 0 to 59)

    - hour (from 0 to 23)

    - day of month (from 1 to 31)

    - month (from 1 to 12) (January=1)

    - day of week (from 0 to 6) (Monday=0)

By default each item is equal to every, for instance :minute :every it means run the job every minute.

Examples

Execute every minute

;; the 'show-time my hypothetical job, you can define another function whatever you want.

(make-cron-job #'show-time)

Execute every hour like:

0:00

1:00

2:00

3:00

.

.

.

23:00

24:00

;; We need to define as:

(make-cron-job #'show-time

               :minute 0 :hour :every)

Start, restart and stop cron

After we defined our job we need to start, or maybe stop or restart.

(cl-cron:start-cron)

(cl-cron:restart-cron)

(cl-cron:stop-cron)