生产者消费者模型

生产者

package com.java.se.producer;

import java.util.concurrent.BlockingQueue;

public class Producer implements Runnable{
    
    
    private BlockingQueue<Integer>  queue;

    @Override
    public void run() {
        produce();
    }
    
    public Producer(BlockingQueue<Integer> q) {
        this.queue = q;
    }
    private void produce() {
        
        for (int i = 0; i<100;i++) {
            this.queue.offer(i);
        }
    }

}

消费者

package com.java.se.producer;

public class ConsumerTask implements Runnable {

    Integer a;

    public ConsumerTask(Integer a) {
        this.a = a;
    }

    @Override
    public void run() {
        System.out.println("消费了" + a);
    }

}

main程序

package com.java.se.producer;

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class ProducerConsumerThread {

    private ThreadPoolExecutor threadPoolExecutor;
    private BlockingQueue<Integer> queeue;

    public ProducerConsumerThread() {
        int corePoolSize = Runtime.getRuntime().availableProcessors()*2;
        long keepAliveTime = 1000;
        this.threadPoolExecutor = new ThreadPoolExecutor(corePoolSize, corePoolSize + 1, keepAliveTime,
                TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>(100));
        this.queeue = new LinkedBlockingQueue<>();
    }

    public void consumer() {
        while (true) {
            Integer i;
            try {
                i = this.queeue.poll(2, TimeUnit.SECONDS);
                if (i == null) {
                    break; // 跳出循环
                }
                threadPoolExecutor.submit(new ConsumerTask(i));
//new ConsumerTask(i).run();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

    public void start() {
        long start = System.currentTimeMillis();
        new Producer(queeue).run();
        consumer();
        long end = System.currentTimeMillis();
        System.out.println("coast " + (end - start) / 1000);
    }

    public static void main(String[] args) {
        ProducerConsumerThread t = new ProducerConsumerThread();
        t.start();
    }

}

注意的是 如果使用线程池消费，那么无法保证有序消费。如果要求有序消费使用注释代码