Multithreading – synchronous counter in clojure

If I want to keep a global counter (for example, count the number of incoming requests across multiple threads), the best way in Java is to use volatile int. suppose clojure is a better way (better throughput)?

Solution

I'll do this with atom in clojure:

(def counter (atom 0N))

;; increment the counter
(swap! counter inc)

;; read the counter
@counter
=> 1

This is completely thread safe and surprisingly high performance In addition, because it uses clojure's exact number processing, it is not vulnerable to integer overflow because volatile int can be