Java-JUC（九）：使用Lock替换synchronized，使用Condition的await,singal,singalall替换object的wait,notify,notifyall实现线程间的通信

package com.dx.juc.test;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class LockAndConditionTest {
    public static void main(String[] args) {
        Clerk clerk = new Clerk();
        Productor productor = new Productor(clerk);
        Consumer consumer = new Consumer(clerk);

        new Thread(productor, "Productor-A").start();
        new Thread(consumer, "Consumer-A").start();

        new Thread(productor, "Productor-B").start();
        new Thread(consumer, "Consumer-B").start();
    }
}

/**
 * 店员
 */
class Clerk {
    private int product = 0;
    private Lock lock = new ReentrantLock();
    private Condition condition = lock.newCondition();

    /**
     * 进货
     */
    public void purchase() {
        lock.lock();

        try {
            while (product >= 1) {
                System.out.println(Thread.currentThread().getName() + ":" + "产品已满。。。");
                try {
                    condition.await();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }

            System.out.println(Thread.currentThread().getName() + ":" + ++product);
            condition.signalAll();
        } finally {
            lock.unlock();
        }
    }

    /**
     * 卖货
     */
    public void sell() {
        lock.lock();

        try {
            while (product <= 0) {
                System.out.println(Thread.currentThread().getName() + ":" + "产品缺貨。。。");
                try {
                    condition.await();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }

            System.out.println(Thread.currentThread().getName() + ":" + --product);
            condition.signalAll();
        } finally {
            lock.unlock();
        }
    }
}

/**
 * 生产者 不断的生产产品给店员
 */
class Productor implements Runnable {
    private Clerk clerk;

    public Productor(Clerk clerk) {
        this.clerk = clerk;
    }

    public void run() {
        for (int i = 0; i < 2; i++) {
            clerk.purchase();
        }
    }
}

/**
 * 消费者 不断的从店员那里消费产品
 */
class Consumer implements Runnable {
    private Clerk clerk;

    public Consumer(Clerk clerk) {
        this.clerk = clerk;
    }

    public void run() {
        for (int i = 0; i < 2; i++) {
            clerk.sell();
        }
    }
}