clojure中的同步计数器 [英] synchronized counter in clojure

问题描述

如果我想保留一个全局计数器（例如计算多个线程的传入请求数），那么在Java中最好的方法是使用volatile int。假设，clojure被使用是有更好的（更好的吞吐量）方法吗？

If I want to keep a global counter (e.g. to count number of incoming requests across multiple threads), then the best way to do in java would be to use a volatile int. Assuming, clojure is being used is there a better (better throughput) way to do?

推荐答案

a Clojure中的a href =http://clojure.org/atoms> atom ：

I would do this with an atom in Clojure:

(def counter (atom 0N))

;; increment the counter
(swap! counter inc)

;; read the counter
@counter
=> 1

这是完全线程安全的，性能令人惊讶。此外，由于它使用Clojure的abitrary-precision数字处理，它不容易受到整数溢出的方式volatile int可以是.....

This is totally thread-safe, and surprisingly high performance. Also, since it uses Clojure's abitrary-precision numeric handling, it isn't vulnerable to integer overflows in the way that a volatile int can be.....

这篇关于clojure中的同步计数器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！