package com.wan.situ;

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

public class ThreadLockTest {

    public final int MAX_SIZE = 10;
    public final Queue<String> mQueue = new LinkedList<>();
    public boolean mRunState = false;
    public Producer worker;
    public Consumer consumer;
    private static int index;

    private final Lock lock = new ReentrantLock();
    private final Condition consumerCondition = lock.newCondition();
    private final Condition producerCondition = lock.newCondition();

    public synchronized String getNewIndex() {
        return (index++) + "";
    }

    public ThreadLockTest() {
        this.worker = new Producer();
        this.consumer = new Consumer();
    }

    public void start() {
        this.mRunState = true;
        this.consumer.start();
        this.worker.start();
    }

    class Producer extends Thread {
        @Override
        public void run() {
            while (mRunState) {
                lock.lock();
                while (mQueue.size() == MAX_SIZE) {
                    try {
                        System.out.println("生产者 + wait");
                        producerCondition.await();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                try {
                    Thread.sleep(1000);
                    String p = getNewIndex();
                    if (mQueue.offer(p)) {
                        System.out.println("生产者 + " + p);
                    }
                    consumerCondition.signal();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                lock.unlock();
            }
        }
    }

    class Consumer extends Thread {
        @Override
        public void run() {
            while (mRunState) {
                lock.lock();
                while (mQueue.isEmpty()) {
                    try {
                        System.out.println("消费者 - wait");
                        consumerCondition.await();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                try {
                    Thread.sleep(1000);
                    System.out.println("消费者 - " + mQueue.poll());
                    producerCondition.signal();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                lock.unlock();
            }
        }

    }

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