package com.isea.data;

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

/**
 * 线程操作资源类
 * 判断，干活，唤醒
 * 虚假唤醒
 *
 * 生产者消费者问题，交替消费和生产，两个生产者，两个消费者
 */

class ShareData{
    private int data = 0;
    Lock lock = new ReentrantLock();
    Condition  condition = lock.newCondition();

    public  void produce() throws InterruptedException {
        lock.lock();
        try {
            while (data != 0){
                condition.await();
            }
            data ++;
            System.out.println(Thread.currentThread().getName() + "生产了，余量\t" + data);
            condition.signalAll();

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public synchronized void consumer() throws InterruptedException {

        lock.lock();
        try {
            while (data == 0){
                condition.await();
            }
            data --;
            System.out.println(Thread.currentThread().getName() + "消费了，余量\t" + data);
            condition.signalAll();
         } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }

    }
}

public class ProduceAndConsumer {
    public static void main(String[] args) {
        ShareData shareData = new ShareData();
        new Thread(() -> {
            for (int i = 0; i < 5; i++) {
                try {
                    shareData.produce();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"Producer1").start();

        new Thread(() -> {
            for (int i = 0; i < 5; i++) {
                try {
                    shareData.consumer();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"Consumer1").start();

        new Thread(() -> {
            for (int i = 0; i < 5; i++) {
                try {
                    shareData.produce();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"Producer2").start();

        new Thread(() -> {
            for (int i = 0; i < 5; i++) {
                try {
                    shareData.consumer();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"Consumer2").start();
    }


}
/*
Producer1生产了，余量	1
Consumer1消费了，余量	0
Producer1生产了，余量	1
Consumer1消费了，余量	0
Producer1生产了，余量	1
Consumer1消费了，余量	0
Producer1生产了，余量	1
Consumer1消费了，余量	0
Producer1生产了，余量	1
Consumer1消费了，余量	0
Producer2生产了，余量	1
Consumer2消费了，余量	0
Producer2生产了，余量	1
Consumer2消费了，余量	0
Producer2生产了，余量	1
Consumer2消费了，余量	0
Producer2生产了，余量	1
Consumer2消费了，余量	0
Producer2生产了，余量	1
Consumer2消费了，余量	0
*/