resilience4clj-ratelimiter

A small Clojure wrapper around the resilience4j RateLimiter module. Requires Clojure 1.9 or later.

Quick Start

The following code defines a function make-remote-call that will limit the number of calls to an external service over a period of time using a rate limiter named :my-limiter in the global registry. If the rate limiter does not already exist in the global registry, one is created.

If the rate of calls to make-remote-call exceeds the rate limit, the calls will begin to wait for permission to run during the next refresh period. If a call does not receive permission to execute before a timeout period expires, an exception will be thrown.

(ns myproject.some-client
  (:require [clj-http.client :as http]
            [resilience4clj.rate-limiter :refer [with-rate-limiter]])

(defn make-remote-call []
  (with-rate-limiter :my-limiter
    (http/get "https://www.example.com")))

Refer to the configuration guide for more information on how to configure the global registry as well as individual rate limiters.

Refer to the usage guide for more information on how to use rate limiters.

License

Copyright © 2019 Thomas C. Taylor and contributors.

Distributed under the Eclipse Public License version 2.0.