Implementing a cron type scheduler in clojure

Question

I\'m looking for any way for clojure that can trigger an event at a given time,

For example: I want a particular process to start at 9:30am and then I can trigger anothe

Answer 1

I needed something that

• started scheduled tasks at whole-second intervals as opposed to whole minute intervals having high system-time accuracy.
• would spawn as many threads as needed, so that tasks started at earlier intervals could exist along side tasks started at later intervals.

After doing a bit of source code reading for at-at, Monotony and Quartzite, I felt that they did not fit the requirements that I was after (which was really something more bare bone) so I wrote my own - cronj

An example of the usage.

(require '[cronj.core :as cj])

(cj/schedule-task! {:id 0   :desc 0 
              :handler #(println "job 0:" %) 
              :tab "/5 * * * * * *"}) ;; every 5 seconds
(cj/schedule-task! {:id 1   :desc 1 
              :handler #(println "job 1:" %) 
              :tab "/3 * * * * * *"}) ;; every 3 seconds

(cj/start!) 

;; wait for scheduler to do its thing ......

(cj/stop!)