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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); | |
limiter.schedulePermitReplenishment(); | |
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() { | |
scheduler.shutdownNow(); | |
} | |
public void schedulePermitReplenishment() { | |
scheduler = Executors.newScheduledThreadPool(1); | |
scheduler.schedule(() -> { | |
semaphore.release(maxPermits - semaphore.availablePermits()); | |
}, 1, timePeriod); | |
} | |
} |
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