package org.web.controller.queue;

import java.util.Random;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * 生产者线程
 */
public class Producer implements Runnable {

    public Producer(BlockingQueue queue) {
        this.queue = queue;
    }

    public void run() {
        String data = null;
        Random r = new Random();

        System.out.println("启动生产者线程！");
        try {
            while (isRunning) {
                System.out.println("正在生产数据...");
                Thread.sleep(r.nextInt(DEFAULT_RANGE_FOR_SLEEP));

                data = "data:" + count.incrementAndGet();
                System.out.println("将数据：" + data + "放入队列...");
                if (!queue.offer(data, 2, TimeUnit.SECONDS)) {
                    System.out.println("放入数据失败：" + data);
                }
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
            Thread.currentThread().interrupt();
        } finally {
            System.out.println("退出生产者线程！");
        }
    }

    public void stop() {
        isRunning = false;
    }

    private volatile boolean isRunning = true;
    private BlockingQueue queue;
    private static AtomicInteger count = new AtomicInteger();
    private static final int DEFAULT_RANGE_FOR_SLEEP = 1000;

}


package org.web.controller.queue;

import java.util.Random;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;

/**
 * 消费者线程
 * 
 */
public class Consumer implements Runnable {

    public Consumer(BlockingQueue<String> queue) {
        this.queue = queue;
    }

    public void run() {
        System.out.println("启动消费者线程！");
        Random r = new Random();
        boolean isRunning = true;
        try {
            while (isRunning) {
                System.out.println("正从队列获取数据...");
                String data = queue.poll(2, TimeUnit.SECONDS);
                if (null != data) {
                    System.out.println("拿到数据：" + data);
                    System.out.println("正在消费数据：" + data);
                    Thread.sleep(r.nextInt(DEFAULT_RANGE_FOR_SLEEP));
                } else {
                    // 超过2s还没数据，认为所有生产线程都已经退出，自动退出消费线程。
                    isRunning = false;
                }
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
            Thread.currentThread().interrupt();
        } finally {
            System.out.println("退出消费者线程！");
        }
    }

    private BlockingQueue<String> queue;
    private static final int DEFAULT_RANGE_FOR_SLEEP = 1000;
}



package org.web.controller.queue;

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingQueue;

public class BlockingQueueTest {

    public static void main(String[] args) throws InterruptedException {
        // 声明一个容量为10的缓存队列
        BlockingQueue<String> queue = new LinkedBlockingQueue<String>(10);

        Producer producer1 = new Producer(queue);
        Producer producer2 = new Producer(queue);
        Producer producer3 = new Producer(queue);
        Consumer consumer = new Consumer(queue);

        // 借助Executors
        ExecutorService service = Executors.newCachedThreadPool();
        // 启动线程
        service.execute(producer1);
        service.execute(producer2);
        service.execute(producer3);
        service.execute(consumer);

        // 执行10s
        Thread.sleep(10 * 1000);
        producer1.stop();
        producer2.stop();
        producer3.stop();

        Thread.sleep(2000);
        // 退出Executor
        service.shutdown();
    }
}