经典的生产者消费者模型（一）

最新推荐文章于 2020-07-26 23:47:59 发布

原创最新推荐文章于 2020-07-26 23:47:59 发布 · 446 阅读

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本文介绍了一个使用Java实现的简单生产者消费者模型。该模型采用synchronized关键字和wait/notifyAll方法来确保线程间的同步，避免了缓冲区溢出的情况。通过实例演示了如何在多个生产者和消费者线程间共享资源。

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package com.zzj.concurrency;

import java.util.LinkedList;

public class ProducerConsumerModel {

	private final LinkedList<String> queue = new LinkedList<>(); 
	private final int max = 3;
	
	public synchronized void put(String e) {
		while(queue.size() == max){ // 此处不能用if判断
			try {
				wait();
			} catch (InterruptedException e1) {
				e1.printStackTrace();
			}
		}
		
		queue.add(e);
		notifyAll(); // 通知消费者消费
	}
	
	public synchronized String get(){
		while(queue.size() == 0){ // 此处不能用if判断
			try {
				wait();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		
		String r = queue.removeFirst();
		notifyAll(); // 通知生产者生产
		return r;
	}
	
	public static void main(String[] args) {
		final ProducerConsumerModel model = new ProducerConsumerModel();
		
		// 启动5生产者
		for (int i = 0; i < 5; i++) {
			new Thread(new Runnable() {
				public void run() {
					for(int j = 0; j < 10; j++){
						model.put(Thread.currentThread().getName() + "-" + j);
					}
				}
			}, "producer-" + i).start();
		}
		
		// 启动10消费者
		for (int i = 0; i < 10; i++) {
			new Thread(new Runnable() {
				public void run() {
					for(int j = 0; j < 5; j++){
						System.out.println(model.get());
					}
				}
			}, "consumer-" + i).start();
		}

	}

}

输出：

producer-0-0
producer-0-1
producer-4-0
producer-0-2
producer-1-0
producer-1-1
producer-1-2
producer-0-3
producer-0-4
producer-1-4
producer-1-3
producer-0-5
producer-2-0
producer-2-1
producer-3-0
producer-1-5
producer-1-6
producer-1-7
producer-4-1
producer-2-2
producer-4-2
producer-0-6
producer-0-7
producer-0-8
producer-0-9
producer-1-8
producer-3-1
producer-1-9
producer-3-2
producer-2-4
producer-2-5
producer-3-7
producer-2-6
producer-2-3
producer-2-7
producer-4-3
producer-3-4
producer-3-3
producer-3-8
producer-4-4
producer-4-5
producer-2-9
producer-3-9
producer-4-6
producer-2-8
producer-4-7
producer-3-6
producer-4-8
producer-3-5
producer-4-9