learning_record_doc/java/队列-queue/Java 队列-生产者消费者模式之卖馒头.md

直接看码
========

```java
import java.util.Queue;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @author dss
 * @projectName queueDemo
 * @date 2021/12/1
 * @description:
 */
public class QueueDemo01 {
    public static void main(String[] args) {
        //队列模拟库存 容量为10
        Queue<ManTou> manTouQueue = new ArrayBlockingQueue<ManTou>(10);
        //放入容量对象
        Container container = new Container(manTouQueue);
        //生产者线程自增
        final AtomicInteger pCount = new AtomicInteger(1);
        //消费者线程自增
        final AtomicInteger cCount = new AtomicInteger(1);

        //设置生产者线程名称
        ThreadFactory producer = new ThreadFactory() {
            public Thread newThread(Runnable r) {
                return new Thread(r,"生产"+pCount.getAndIncrement()+"线");
            }
        };
        //设置消费者线程名称
        ThreadFactory consumer = new ThreadFactory() {
            public Thread newThread(Runnable r) {
                return new Thread(r,"北京"+cCount.getAndIncrement()+"店");
            }
        };
        //生产者线程池
        ExecutorService producers = Executors.newCachedThreadPool(producer);
        //消费者线程池
        ExecutorService consumers = Executors.newCachedThreadPool(consumer);

        for (int i = 0; i < 5; i++) {
            consumers.execute(new Consumer(container));
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            producers.execute(new Producer(container));
        }

    }
}

//容器
class Container{
    //馒头自增编号
    private int no;
    //馒头队列
    private Queue<ManTou> manTouQueue;

    Container(Queue<ManTou> manTouQueue){
        this.manTouQueue=manTouQueue;
    }

    public int getNo() {
        return no;
    }

    public void setNo(int no) {
        this.no = no;
    }

    public Queue<ManTou> getQueue() {
        return manTouQueue;
    }
}


//产品
class ManTou{
    //编号
    private int no;
    ManTou(int no){
        this.no = no;
    };

    public int getNo() {
        return no;
    }
}

//生产
class Producer implements Runnable{

    //容器
    private Container container;


    Producer(Container container){
        this.container=container;
    }

    public void run() {
        //循环生产
        while (true){
            //对容器进行同步 保证线程安全
            synchronized (container){

                //将生产馒头添加到队列
                boolean flag = container.getQueue().offer(new ManTou(container.getNo()+1));
                if (flag){
                    //编号加一
                    container.setNo(container.getNo()+1);
                    //记录生产的馒头
                    System.out.println(Thread.currentThread().getName()+"生产馒头"+container.getNo());
                }else{
                    //提示队列已满请先消费
                    System.out.println("库存满了快去销售~");
                }
            }
            try {
                Thread.sleep(10000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

//消费
class Consumer implements Runnable{

    //容器
    private Container container;

    Consumer(Container container){
        this.container=container;
    }

    public void run() {
        //循环销售
        while (true){
            synchronized (container){
                //获取馒头
                ManTou manTou = container.getQueue().poll();
                if (manTou!=null){
                    //记录销售馒头
                    System.out.println(Thread.currentThread().getName()+"出售馒头"+manTou.getNo());
                }else{
                    System.err.println("卖完了快去生产~");
                }
                System.err.println("当前库存"+container.getQueue().size());
            }
            try {
                Thread.sleep(10000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

    }
}

```