消费者和生产者问题的实现-基于线程安全的容器来和非线程安全的容器类

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生产者和消费者的实现的大概思路

缓冲区的接口

import java.util.concurrent.locks.Condition;import java.util.concurrent.locks.ReentrantLock;/** * All rights reserved. * Created by zhaideyin on 2017/10/27. * Description: */public interface Plate {    final int PLATE_SIZE=10;    ReentrantLock reentrantLock=new ReentrantLock();    Condition notEmpty=reentrantLock.newCondition();    Condition notFull=reentrantLock.newCondition();    void takeApple();    void putApple();}

非线程安全的容器类,以list为例

import java.util.ArrayList;import java.util.List;/** * All rights reserved. * Created by zhaideyin on 2017/10/27. * Description: */public class NoSafePlate implements Plate {    List<Integer>  plateList=new ArrayList<Integer>();    @Override   public void takeApple(){        reentrantLock.lock();        if(plateList.size()==0){            try {                 System.out.println(Thread.currentThread()+"other consumer wait");                  notEmpty.await();//阻塞消费进程            } catch (InterruptedException e) {                e.printStackTrace();            }        }else {            plateList.remove(0);            System.out.println(Thread.currentThread()+"consumer :"+plateList.size()+" apple");            notFull.signalAll();//通知生产线程可以放苹果        }        reentrantLock.unlock();    }    @Override    public void putApple(){        reentrantLock.lock();        if(plateList.size()==PLATE_SIZE){            try {                System.out.println(Thread.currentThread()+"other producer wait");                notFull.await();            } catch (InterruptedException e) {                e.printStackTrace();            }        }else {            plateList.add(1);            System.out.println(Thread.currentThread()+" producer :"+plateList.size()+" apple");            notEmpty.signalAll();        }        reentrantLock.unlock();    }}

线程安全的容器类

import java.util.ArrayList;import java.util.Collections;import java.util.List;/** * All rights reserved. * Created by zhaideyin on 2017/10/27. * Description: */public class SafePlate implements Plate{    //一下的方法虽然生成的list是线程安全的list,也只是仅仅局限于原子操作的方法,在多线程的条件下,这个list也有可能会被修改    List<Integer> plateList= Collections.synchronizedList(new ArrayList<Integer>());    @Override   public  void takeApple(){        synchronized (plateList) {            while (plateList.size()==0){                System.out.println(Thread.currentThread()+"consumer wait");                try {                    plateList.wait();                    Thread.sleep(1000);                } catch (InterruptedException e) {                    e.printStackTrace();                }            }            plateList.remove(0);            System.out.println(Thread.currentThread() + "consumer : " + plateList.size());            plateList.notifyAll();      }    }    @Override   public  void putApple(){        synchronized (plateList) {            while (plateList.size()==PLATE_SIZE){                System.out.println(Thread.currentThread()+"producer wait");                try {                    plateList.wait();                    Thread.sleep(1000);                } catch (InterruptedException e) {                    e.printStackTrace();                }            }            plateList.add(1);            System.out.println(Thread.currentThread() + "producer : " + plateList.size());            plateList.notifyAll();       }    }}

生产者

import java.util.Random;/** * All rights reserved. * Created by zhaideyin on 2017/10/27. * Description: */public class Producer implements Runnable {    private Plate plate;    Random r=new Random(10);    public Producer(NoSafePlate noSafePlate) {        this.plate = noSafePlate;    }    public Producer(SafePlate safePlate) {        this.plate = safePlate;    }    @Override    public  void run() {        while (true) {            plate.putApple();        }    }}

消费者

/** * All rights reserved. * Created by zhaideyin on 2017/10/27. * Description: */public class Consumer implements Runnable {    private  Plate plate;    public Consumer(NoSafePlate noSafePlate) {        this.plate = noSafePlate;    }    public Consumer(SafePlate safePlate) {        this.plate = safePlate;    }    @Override    public void run() {        //消费者先等待一段时间,等待生产者生产了部分之后再开始消费        try {            Thread.sleep(3000);        } catch (InterruptedException e) {            e.printStackTrace();        }        while (true) {            plate.takeApple();        }    }}

容器安全的测试类

import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;/** * Copyright 2010-2020  OPPO Mobile Comm Corp., Ltd. * All rights reserved. * Created by zhaideyin on 2017/10/27. * Description: */public class SafePlateTest {    public static void main(String[] args) throws InterruptedException {        SafePlate safePlate=new SafePlate();        ExecutorService service= Executors.newCachedThreadPool();        for(int i=0;i<5;i++){            service.submit(new Producer(safePlate));        }        for(int i=0;i<5;i++){            service.submit(new Consumer(safePlate));        }        Thread.sleep(10*1000);        service.shutdown();    }}

运行结果
这里写图片描述
线程不安全的容器类的测试类

import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;public class ConsumerAndProducerTest {    public static void main(String[] args) throws InterruptedException{        NoSafePlate noSafePlate =new NoSafePlate();        ExecutorService service= Executors.newCachedThreadPool();        for(int i=0;i<5;i++){            service.submit(new Producer(noSafePlate));        }        for(int i=0;i<5;i++){            service.submit(new Consumer(noSafePlate));        }        Thread.sleep(10*1000);        service.shutdown();    }}

运行结果
这里写图片描述

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