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

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  plateList=new ArrayList();
    @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 plateList= Collections.synchronizedList(new ArrayList());
    @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

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