定期调用Clojure中的函数 [英] Periodically calling a function in Clojure
问题描述
我正在寻找一种非常简单的方法，在Clojure中定期调用函数。
I'm looking for a very simple way to call a function periodically in Clojure.
JavaScript的 setInterval 有我想要的那种API。如果我在Clojure中重新创建它，它看起来像这样：
JavaScript's setInterval has the kind of API I'd like. If I reimagined it in Clojure, it'd look something like this:
(def job (set-interval my-callback 1000))
; some time later...
(clear-interval job)
我的目的我不介意，如果这创建一个新的线程，运行在线程池或其他东西。这也不是关键的时机是精确的。事实上，提供的时间（以毫秒为单位）只能是一个调用结束和下一个调用结束之间的延迟。
For my purposes I don't mind if this creates a new thread, runs in a thread pool or something else. It's not critical that the timing is exact either. In fact, the period provided (in milliseconds) can just be a delay between the end of one call completing and the commencement of the next.
推荐答案
Clojure还有很多调度库：
（从简单到非常高级）
There's also quite a few scheduling libraries for Clojure: (from simple to very advanced)
- at-at
- chime (core.async integration)
- monotony
- quartzite
直接从at-at的github主页的示例：
Straight from the examples of the github homepage of at-at:
(use 'overtone.at-at)
(def my-pool (mk-pool))
(let [schedule (every 1000 #(println "I am cool!") my-pool)]
(do stuff while schedule runs)
(stop schedule))
使用（每1000＃（printlnI am cool！）my-pool：fixed-delay true）如果你想在任务结束和开始之间延迟一秒的下一个，而不是两个开始。
Use (every 1000 #(println "I am cool!") my-pool :fixed-delay true) if you want a delay of a second between end of task and start of next, instead of between two starts.
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