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public class SimpleRateLimiter {
private Semaphore semaphore;
private int maxPermits;
private TimeUnit timePeriod;
private ScheduledExecutorService scheduler;
public static SimpleRateLimiter create(int permits, TimeUnit timePeriod) {
SimpleRateLimiter limiter = new SimpleRateLimiter(permits, timePeriod);
return limiter;
private SimpleRateLimiter(int permits, TimeUnit timePeriod) {
this.semaphore = new Semaphore(permits);
this.maxPermits = permits;
this.timePeriod = timePeriod;
public boolean tryAcquire() {
return semaphore.tryAcquire();
public void stop() {
public void schedulePermitReplenishment() {
scheduler = Executors.newScheduledThreadPool(1);
scheduler.schedule(() -> {
semaphore.release(maxPermits - semaphore.availablePermits());
}, 1, timePeriod);
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