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package servlet.test;

import java.util.concurrent.Semaphore;

public class SemaphoreTest {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Semaphore semaphore = new Semaphore(2);
		CustomThread ct1 = new CustomThreadSemaphore(semaphore, "A Thread");
		ct1.start();
		CustomThread ct2 = new CustomThreadSemaphore(semaphore, "B Thread");
		ct2.start();
		CustomThread ct3 = new CustomThreadSemaphore(semaphore, "C Thread");
		ct3.start();
	}

}

class CustomThreadSemaphore extends Thread {
	private Semaphore semaphore;

	public CustomThreadSemaphore(Semaphore semaphore, String name) {
		setName(name);
		this.semaphore = semaphore;
	}

	@Override
	public void run() {
		System.out.println(getName() + " is waiting.");
		try {
			semaphore.acquire();
			System.out.println(getName() + " is service.");
			Thread.sleep(1000);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
			System.out.println(getName() + " is done.");
			semaphore.release();
		}
	}
}