多线程之Condition

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简介

上面我们说了Lock,那是对synchronized的一种更为面向对象的替代,在原来的synchronized内部,我们可以调用object的wait与notify方法,那么使用lock之后,如何进行线程的通信呢？condition一方面是对lock功能的补充(也就是说,你用了lock,为了保证线程的通信,就得用condition)。

Condition实现多生产多消费模式

package com.example.demo.three.untils.condition;/** * @Author: CYM * @Description: * @Data: 2017/10/11 16:23 */import java.util.LinkedList;import java.util.concurrent.TimeUnit;import java.util.concurrent.locks.Condition;import java.util.concurrent.locks.Lock;import java.util.concurrent.locks.ReentrantLock;import java.util.stream.IntStream;/** * Condition是一个wait notify替代 */public class ConditionTest1 {    private final static Lock lock = new ReentrantLock();    private final static Condition pCondition = lock.newCondition();    private final static Condition cCondition = lock.newCondition();    private final static LinkedList<Long> timeList = new LinkedList<>();    private final static int MAX = 100;    public static void main(String[] args) {        IntStream.range(0, 6).boxed().forEach(ConditionTest1::beginProduce);        IntStream.range(0, 10).boxed().forEach(ConditionTest1::beginConsume);    }    private static void beginProduce(int i) {        new Thread(() -> {            for (; ; ) {                produce();                try {                    TimeUnit.SECONDS.sleep(2);                } catch (InterruptedException e) {                    e.printStackTrace();                }            }        }, "p-" + i).start();    }    private static void beginConsume(int i) {        new Thread(() -> {            for (; ; ) {                consume();                try {                    TimeUnit.SECONDS.sleep(2);                } catch (InterruptedException e) {                    e.printStackTrace();                }            }        }, "c" + i).start();    }    private static void produce() {        try {            lock.lock();            while (timeList.size() >= MAX) {                pCondition.await();            }            long l = System.currentTimeMillis();            System.out.println(Thread.currentThread().getName() + "-p-->>" + l);            timeList.addLast(l);            cCondition.signalAll();        } catch (InterruptedException e) {            e.printStackTrace();        } finally {            lock.unlock();        }    }    private static void consume() {        try {            lock.lock();            while (timeList.isEmpty()) {                cCondition.await();            }            Long aLong = timeList.removeFirst();            System.out.println(Thread.currentThread().getName() + "--c->>" + aLong);            pCondition.signalAll();        } catch (InterruptedException e) {            e.printStackTrace();        } finally {            lock.unlock();        }    }}

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