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使用示例

ConditionDemoAwait :开始之后加锁，阻塞并释放锁

package com.caozz.demo5.concurrent;

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

public class ConditionDemoAwait implements Runnable{

    private Lock lock;

    private Condition condition;

    public ConditionDemoAwait(Lock lock, Condition condition){
        this.condition = condition;
        this.lock = lock;
    }

    @Override
    public void run() {
        System.out.println("begin---ConditoiopnDemoAwait--");
        lock.lock();
        try{
            condition.await();
            System.out.println("end---ConditoiopnDemoAwait--");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
}

• ConditionDemoSinal :开始之后唤醒，此时并不会释放锁，所以会先结束，才会释放锁

package com.caozz.demo5.concurrent;

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

public class ConditionDemoSinal implements Runnable{

    private Lock lock;

    private Condition condition;

    public ConditionDemoSinal(Lock lock, Condition condition){
        this.condition = condition;
        this.lock = lock;
    }

    @Override
    public void run() {
        System.out.println("begin---ConditoiopnDemoSinal--");
        lock.lock();
        try{
            //让当前线程阻塞，相当于Object.notify()
            condition.signal();
            System.out.println("end---ConditoiopnDemoSinal--");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
}

测试：

package com.caozz.demo5.controller;

import com.caozz.demo5.concurrent.ConditionDemoAwait;
import com.caozz.demo5.concurrent.ConditionDemoSinal;
import com.caozz.demo5.concurrent.Consumer;
import com.caozz.demo5.concurrent.Producer;

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 Test {
    public static void main(String[] args) throws InterruptedException {
        Lock lock = new ReentrantLock();
        Condition condition = lock.newCondition();
        ConditionDemoAwait await = new ConditionDemoAwait(lock, condition);
        ConditionDemoSinal sinal = new ConditionDemoSinal(lock, condition);
        new Thread(await).start();
        Thread.sleep(10);
        new Thread(sinal).start();
    }
}

结果：
线程启动：await启动，执行开始后加锁，并阻塞，此时signal开始，并执行唤醒，然后signal结束，释放锁，被唤醒得await结束
如果启动不加sleep，可能会sinal先启动，那么sinal开始，唤醒，结束，然后await执行，阻塞，然后就会一直阻塞，无法结束，因为没有被唤醒

begin---ConditoiopnDemoAwait--
begin---ConditoiopnDemoSinal--
end---ConditoiopnDemoSinal--
end---ConditoiopnDemoAwait--

设计猜想

• 作用：实现线程的阻塞与唤醒
• 前提条件： 必须先要获得锁
• await、signal、signalall
  • await:让线程阻塞，并且释放锁
  • signal：唤醒阻塞的线程

• 加锁的操作，必然会涉及到AQS的阻塞队列
• await释放锁时，AQS队列中不存在已经释放锁的线程，那么被释放的线程去到了哪里？
• 唤醒被阻塞的线程：被阻塞的线程在哪里？
  经过上面的思考，应该可以想到，通过await方法释放的线程，必须要有一个地方来存储，同时，阻塞的线程，是通过AQS还是单独地方来存储呢？

Condition等价于wait/notify
Condition是JUC里面得实现，所以不能使用wait/notify ,锁的实现不同。

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