java_多线程_生产者与消费者(并发协作)

对于多线程程序来说,不管任何编程语言,生产者和消费者模型都是最经典的。就像学习每一门编程语言一样,Hello World!都是最经典的例子。

实际上,准确说应该是“生产者-消费者-仓储”模型,离开了仓储,生产者消费者模型就显得没有说服力了。
对于此模型,应该明确一下几点:
1、生产者仅仅在仓储未满时候生产,仓满则停止生产。
2、消费者仅仅在仓储有产品时候才能消费,仓空则等待。
3、当消费者发现仓储没产品可消费时候会通知生产者生产。
4、生产者在生产出可消费产品时候,应该通知等待的消费者去消费。

复制代码
package cn.thread;



import java.util.concurrent.BlockingQueue;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import java.util.concurrent.LinkedBlockingQueue;



/**

 * java多线程模拟生产者消费者问题

 * 

 * ProducerConsumer是主类,Producer生产者,Consumer消费者,Product产品,Storage仓库

 * 

 * @author 林计钦

 * @version 1.0 2013-7-24 下午04:49:02

 */

public class ProducerConsumer {

    public static void main(String[] args) {

        ProducerConsumer pc = new ProducerConsumer();



        Storage s = pc.new Storage();



        ExecutorService service = Executors.newCachedThreadPool();

        Producer p = pc.new Producer("张三", s);

        Producer p2 = pc.new Producer("李四", s);

        Consumer c = pc.new Consumer("王五", s);

        Consumer c2 = pc.new Consumer("老刘", s);

        Consumer c3 = pc.new Consumer("老林", s);

        service.submit(p);

        //service.submit(p2);

        service.submit(c);

        service.submit(c2);

        service.submit(c3);

        

    }



    /**

     * 消费者

     * 

     * @author 林计钦

     * @version 1.0 2013-7-24 下午04:53:30

     */

    class Consumer implements Runnable {

        private String name;

        private Storage s = null;



        public Consumer(String name, Storage s) {

            this.name = name;

            this.s = s;

        }



        public void run() {

            try {

                while (true) {

                    System.out.println(name + "准备消费产品.");

                    Product product = s.pop();

                    System.out.println(name + "已消费(" + product.toString() + ").");

                    System.out.println("===============");

                    Thread.sleep(500);

                }

            } catch (InterruptedException e) {

                e.printStackTrace();

            }



        }



    }



    /**

     * 生产者

     * 

     * @author 林计钦

     * @version 1.0 2013-7-24 下午04:53:44

     */

    class Producer implements Runnable {

        private String name;

        private Storage s = null;



        public Producer(String name, Storage s) {

            this.name = name;

            this.s = s;

        }



        public void run() {

            try {

                while (true) {

                    Product product = new Product((int) (Math.random() * 10000)); // 产生0~9999随机整数

                    System.out.println(name + "准备生产(" + product.toString() + ").");

                    s.push(product);

                    System.out.println(name + "已生产(" + product.toString() + ").");

                    System.out.println("===============");

                    Thread.sleep(500);

                }

            } catch (InterruptedException e1) {

                e1.printStackTrace();

            }



        }

    }



    /**

     * 仓库,用来存放产品

     * 

     * @author 林计钦

     * @version 1.0 2013-7-24 下午04:54:16

     */

    public class Storage {

        BlockingQueue<Product> queues = new LinkedBlockingQueue<Product>(10);



        /**

         * 生产

         * 

         * @param p

         *            产品

         * @throws InterruptedException

         */

        public void push(Product p) throws InterruptedException {

            queues.put(p);

        }



        /**

         * 消费

         * 

         * @return 产品

         * @throws InterruptedException

         */

        public Product pop() throws InterruptedException {

            return queues.take();

        }

    }



    /**

     * 产品

     * 

     * @author 林计钦

     * @version 1.0 2013-7-24 下午04:54:04

     */

    public class Product {

        private int id;



        public Product(int id) {

            this.id = id;

        }



        public String toString() {// 重写toString方法

            return "产品:" + this.id;

        }

    }



}

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