package com.winterbe.java8.samples.concurrent;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;
import java.util.stream.IntStream;
/**
* @author Benjamin Winterberg
*/
public class Semaphore2 {
private static Semaphore semaphore = new Semaphore(5);
public static void main(String[] args) {
ExecutorService executor = Executors.newFixedThreadPool(10);
IntStream.range(0, 10)
.forEach(i -> executor.submit(Semaphore2::doWork));
ConcurrentUtils.stop(executor);
}
private static void doWork() {
boolean permit = false;
try {
permit = semaphore.tryAcquire(1, TimeUnit.SECONDS);
if (permit) {
System.out.println("Semaphore acquired");
ConcurrentUtils.sleep(5);
} else {
System.out.println("Could not acquire semaphore");
}
} catch (InterruptedException e) {
throw new IllegalStateException(e);
} finally {
if (permit) {
semaphore.release();
}
}
}
}