生产者消费者JAVA实现

三种实现方式：

1. Object对象的wait(),notify()，加synchronize.

2. Lock的await(),signal().

3. BlockingQueue阻塞队列.

Object对象的wait(),notify()，加synchronize --> StorageObject();

Lock的await(),signal() --> StorageLock();

BlockingQueue阻塞队列 --> StorageBlockingQueue();

package concurent;

import java.util.LinkedList;
import java.util.concurrent.BlockingDeque;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * Created by jenkin K on 17/6/8.
 */
public class PCModelTread {

    public static void main(String args[]){

//        Storage storage = new StorageObject();
        Storage storage = new StorageLock();
//        Storage storage = new StorageBlockingQueue();

        Producer p1 = new Producer(storage);
        Producer p2 = new Producer(storage);
        Producer p3 = new Producer(storage);
        Producer p4 = new Producer(storage);

        Consumer c1 = new Consumer(storage);
        Consumer c2 = new Consumer(storage);

        p1.setNum(6);
        p2.setNum(1);
        p3.setNum(1);
        p4.setNum(8);

        c1.setNum(1);
        c2.setNum(5);

        new Thread(p1, "producer1").start();
        new Thread(p2, "producer2").start();
        new Thread(p3, "producer3").start();
        new Thread(p4, "producer4").start();

        new Thread(c1, "consumer1").start();
        new Thread(c2, "consumer2").start();
    }
}

interface Storage {
    public void consume(int num);
    public void produce(int num);
}

class StorageObject implements Storage {
    final int MAX_STORAGE = 10;
    private LinkedList<Object> list = new LinkedList<Object>();

    public void produce(int num){
        synchronized (list){
            while(num + list.size() > MAX_STORAGE){
                System.out.println("库存:["+ list.size() + "]/["+ MAX_STORAGE +"], 待生产数量:[" + num + "], 生产阻塞:" + Thread.currentThread().getName() + "阻塞.");
                try{
                    list.wait();
                }catch (InterruptedException e){
                    e.printStackTrace();
                }
            }
            for(int i = 0; i < num; i++){
                list.add(new Object());
                System.out.println("库存:["+ list.size() + "]/[" + MAX_STORAGE + "], " + Thread.currentThread().getName() + "正在生产:[" + (i+1) + "].");
            }
            System.out.println(Thread.currentThread().getName() + "生产完成, 共生产:" + num + ", 库存:["+ list.size() + "]/["+ MAX_STORAGE +"].");
            list.notifyAll();
        }
    }

    public void consume(int num){
        synchronized (list){
            while(list.size() < num){
                System.out.println("库存:["+ list.size() + "]/[" + MAX_STORAGE + "], 待消费数量:[" + num + "], 消费阻塞:" + Thread.currentThread().getName() + "阻塞.");
                try{
                    list.wait();
                }catch (InterruptedException e){
                    e.printStackTrace();
                }
            }
            for(int i = 0; i < num; i++){
                System.out.println("库存:["+ list.size() + "]/[" + MAX_STORAGE + "], " + Thread.currentThread().getName() + "正在消费:[" + (i+1) + "].");
                list.remove();
            }
            System.out.println(Thread.currentThread().getName() + "消费完成, 共消费:" + num + ", 库存:["+ list.size() + "]/["+ MAX_STORAGE + "].");
            list.notifyAll();
        }
    }
}

class StorageLock implements Storage {
    final int MAX_STORAGE = 10;
    LinkedList<Object> list = new LinkedList<Object>();
    Lock lock = new ReentrantLock(false);
    Condition produce = lock.newCondition();
    Condition consume = lock.newCondition();

    @Override
    public void produce(int num) {
        lock.lock();
        try {
            while (num + list.size() > MAX_STORAGE) {
                System.out.println("库存:[" + list.size() + "]/[" + MAX_STORAGE + "], 待生产数量:[" + num + "], 生产阻塞:" + Thread.currentThread().getName() + "阻塞.");
                produce.await();
            }
            for (int i = 0; i < num; i++) {
                list.add(new Object());
                System.out.println("库存:[" + list.size() + "]/[" + MAX_STORAGE + "], " + Thread.currentThread().getName() + "正在生产:[" + (i + 1) + "].");
            }
            System.out.println(Thread.currentThread().getName() + "生产完成, 共生产:" + num + ", 库存:[" + list.size() + "]/[" + MAX_STORAGE + "].");
        }catch (InterruptedException e){
            e.printStackTrace();
        }finally {
            produce.signalAll();
            consume.signalAll();
            lock.unlock();
        }
    }

    @Override
    public void consume(int num) {
        lock.lock();
        try {
            while (list.size() < num) {
                System.out.println("库存:[" + list.size() + "]/[" + MAX_STORAGE + "], 待消费数量:[" + num + "], 消费阻塞:" + Thread.currentThread().getName() + "阻塞.");
                consume.await();
            }
            for (int i = 0; i < num; i++) {
                System.out.println("库存:[" + list.size() + "]/[" + MAX_STORAGE + "], " + Thread.currentThread().getName() + "正在消费:[" + (i + 1) + "].");
                list.remove();
            }
            System.out.println(Thread.currentThread().getName() + "消费完成, 共消费:" + num + ", 库存:[" + list.size() + "]/[" + MAX_STORAGE + "].");
        }catch (InterruptedException e){
            e.printStackTrace();
        }finally {
            consume.signalAll();
            produce.signalAll();
            lock.unlock();
        }
    }
}

class StorageBlockingQueue implements Storage{
    int MAX_STORAGE = 10;
    BlockingQueue<Object> queue = new LinkedBlockingQueue<Object>(MAX_STORAGE);

    @Override
    public void produce(int num) {
        if(queue.size() == MAX_STORAGE){
            System.out.println("库存:[" + queue.size() + "]/[" + MAX_STORAGE + "], 待生产数量:[" + num + "], 生产阻塞:" + Thread.currentThread().getName() + "阻塞.");
        }
        for(int i = 0; i < num; i++){
            try {
                queue.put(new Object());
                System.out.println("库存:[" + queue.size() + "]/[" + MAX_STORAGE + "], " + Thread.currentThread().getName() + "正在生产:[" + (i + 1) + "].");
            }catch (InterruptedException e){
                e.printStackTrace();
            }
        }
        System.out.println(Thread.currentThread().getName() + "生产完成, 共生产:" + num + ", 库存:[" + queue.size() + "]/[" + MAX_STORAGE + "].");
    }

    @Override
    public void consume(int num) {
        if(queue.size() == 0){
            System.out.println("库存:[" + queue.size() + "]/[" + MAX_STORAGE + "], 待消费数量:[" + num + "], 消费阻塞:" + Thread.currentThread().getName() + "阻塞.");
        }
        for (int i = 1; i < num; i++){
            try{
                queue.take();
                System.out.println("库存:[" + queue.size() + "]/[" + MAX_STORAGE + "], " + Thread.currentThread().getName() + "正在消费:[" + (i + 1) + "].");
            }catch (InterruptedException e){
                e.printStackTrace();
            }
        }
        System.out.println(Thread.currentThread().getName() + "消费完成, 共消费:" + num + ", 库存:[" + queue.size() + "]/[" + MAX_STORAGE + "].");
    }
}

class Producer implements Runnable {

    Storage storage;
    int num;

    public Producer(Storage storage){
        this.storage = storage;
    }

    @Override
    public void run() {
        produce(num);
    }

    public void produce(int num){
        storage.produce(num);
    }

    public void setNum(int num) {
        this.num = num;
    }
}

class Consumer implements Runnable {

    Storage storage;
    int num;

    public Consumer(Storage storage){
        this.storage = storage;
    }
    @Override
    public void run() {
        consumer(num);
    }

    public void consumer(int num){
        storage.consume(num);
    }

    public void setNum(int num) {
        this.num = num;
    }
}

 输出结果：

StorageObject()输出结果：
库存:[1]/[10], producer1正在生产:[1].
库存:[2]/[10], producer1正在生产:[2].
库存:[3]/[10], producer1正在生产:[3].
库存:[4]/[10], producer1正在生产:[4].
库存:[5]/[10], producer1正在生产:[5].
库存:[6]/[10], producer1正在生产:[6].
producer1生产完成, 共生产:6, 库存:[6]/[10].
库存:[6]/[10], consumer2正在消费:[1].
库存:[5]/[10], consumer2正在消费:[2].
库存:[4]/[10], consumer2正在消费:[3].
库存:[3]/[10], consumer2正在消费:[4].
库存:[2]/[10], consumer2正在消费:[5].
consumer2消费完成, 共消费:5, 库存:[1]/[10].
库存:[1]/[10], consumer1正在消费:[1].
consumer1消费完成, 共消费:1, 库存:[0]/[10].
库存:[1]/[10], producer4正在生产:[1].
库存:[2]/[10], producer4正在生产:[2].
库存:[3]/[10], producer4正在生产:[3].
库存:[4]/[10], producer4正在生产:[4].
库存:[5]/[10], producer4正在生产:[5].
库存:[6]/[10], producer4正在生产:[6].
库存:[7]/[10], producer4正在生产:[7].
库存:[8]/[10], producer4正在生产:[8].
producer4生产完成, 共生产:8, 库存:[8]/[10].
库存:[9]/[10], producer3正在生产:[1].
producer3生产完成, 共生产:1, 库存:[9]/[10].
库存:[10]/[10], producer2正在生产:[1].
producer2生产完成, 共生产:1, 库存:[10]/[10].

StorageLock()输出结果：
库存:[1]/[10], producer1正在生产:[1].
库存:[2]/[10], producer1正在生产:[2].
库存:[3]/[10], producer1正在生产:[3].
库存:[4]/[10], producer1正在生产:[4].
库存:[5]/[10], producer1正在生产:[5].
库存:[6]/[10], producer1正在生产:[6].
producer1生产完成, 共生产:6, 库存:[6]/[10].
库存:[7]/[10], producer2正在生产:[1].
producer2生产完成, 共生产:1, 库存:[7]/[10].
库存:[8]/[10], producer3正在生产:[1].
producer3生产完成, 共生产:1, 库存:[8]/[10].
库存:[8]/[10], 待生产数量:[8], 生产阻塞:producer4阻塞.
库存:[8]/[10], consumer1正在消费:[1].
consumer1消费完成, 共消费:1, 库存:[7]/[10].
库存:[7]/[10], consumer2正在消费:[1].
库存:[6]/[10], consumer2正在消费:[2].
库存:[5]/[10], consumer2正在消费:[3].
库存:[4]/[10], consumer2正在消费:[4].
库存:[3]/[10], consumer2正在消费:[5].
consumer2消费完成, 共消费:5, 库存:[2]/[10].
库存:[3]/[10], producer4正在生产:[1].
库存:[4]/[10], producer4正在生产:[2].
库存:[5]/[10], producer4正在生产:[3].
库存:[6]/[10], producer4正在生产:[4].
库存:[7]/[10], producer4正在生产:[5].
库存:[8]/[10], producer4正在生产:[6].
库存:[9]/[10], producer4正在生产:[7].
库存:[10]/[10], producer4正在生产:[8].
producer4生产完成, 共生产:8, 库存:[10]/[10].

StorageBlockingQueue()输出结果：
库存:[3]/[10], producer2正在生产:[1].
库存:[3]/[10], consumer2正在消费:[2].
库存:[4]/[10], producer4正在生产:[1].
consumer1消费完成, 共消费:1, 库存:[4]/[10].
库存:[3]/[10], producer3正在生产:[1].
producer3生产完成, 共生产:1, 库存:[3]/[10].
库存:[2]/[10], producer1正在生产:[1].
库存:[3]/[10], producer4正在生产:[2].
库存:[2]/[10], consumer2正在消费:[3].
producer2生产完成, 共生产:1, 库存:[3]/[10].
库存:[4]/[10], consumer2正在消费:[4].
库存:[5]/[10], producer4正在生产:[3].
库存:[4]/[10], producer1正在生产:[2].
库存:[5]/[10], producer1正在生产:[3].
库存:[4]/[10], producer4正在生产:[4].
库存:[3]/[10], consumer2正在消费:[5].
库存:[7]/[10], producer4正在生产:[5].
库存:[6]/[10], producer1正在生产:[4].
库存:[8]/[10], producer4正在生产:[6].
consumer2消费完成, 共消费:5, 库存:[7]/[10].
库存:[10]/[10], producer4正在生产:[7].
库存:[9]/[10], producer1正在生产:[5].

　　

从输出结果看，Synchronized和Lock方式，生产和消费是有序的，也就是某一生产线程全生产完，才会释放锁，不会被其他线程强占。BlockingQueue方式，生产和消费是无序的，即，生产线程没有生产完，或是消费线程没有消费完，都会被其他线程强占。原因是，前者的循环生产操作是在锁同步块里边，后者的生产循环生产操作是在锁的外面。