java实现万人抢一张火车票

朴灿烈づ我的快乐病毒、 2022-04-06 15:54 357阅读 0赞

一万人，同时抢一张火车票

public class TicketMain {
    
    	//拿到火车票的线程名
    	public static String getTicketThread;
    	//拿到火车票的线程数
    	public static volatile AtomicInteger getTicketThreadNum = new AtomicInteger(0);
    	//火车票数
    	public static volatile int ticketNum = 1;
    	
    	public static int poolSize = 10000;
    	//CyclicBarrier模拟一万人同时抢票的场景
    	public static CyclicBarrier cb = new CyclicBarrier(poolSize);
    	//有多少张火车票，就允许多少个线程并发运行
    	public static final Semaphore s = new Semaphore(ticketNum);
    	static class Ticket implements Runnable {
    		public void run() {
    			try {
    				Thread.sleep((long)(4000* Math.random()));
    				System.out.println(Thread.currentThread().getName()+"-------------------------begin");
    				cb.await();
    				s.acquire();
    				if(ticketNum <= 0) {
    					return ;
    				}
    				ticketNum--;
    				getTicketThread = Thread.currentThread().getName();
    				getTicketThreadNum.incrementAndGet();
    				System.out.println(Thread.currentThread().getName() + " get ticket................................................");
    			} catch (InterruptedException e) {
    				e.printStackTrace();
    			} catch (BrokenBarrierException e) {
    				e.printStackTrace();
    			} finally {
    				s.release();
    				System.out.println(Thread.currentThread().getName()+"-------------------------end");
    			}
    		}
    
    
    	}
    	
    	public static void main(String[] args) {
    		ExecutorService threadPool = Executors.newFixedThreadPool(poolSize);
    		for(int i = 0; i < poolSize; i++) {
    			threadPool.execute(new Ticket());
    		}
    		threadPool.shutdown();
    		while(!threadPool.isTerminated()) {
    		}
    		try {
    			Thread.sleep(1000);
    			System.out.println("getTicketThread:" + getTicketThread + ", getTicketNum:" + getTicketThreadNum.get());
    		} catch (InterruptedException e) {
    			e.printStackTrace();
    		}
    	}
    
    
    }