生产者消费者的3种实现方式

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/**
 * 一、使用synchronized、wait、notify实现生产者，消费者模式
 */
public class ProducerConsumerWaitNofityAll {
    public static void main(String[] args) {
        Queue<Integer> queue = new LinkedList<Integer>();
        new Thread(new Producer1(queue)).start();
        new Thread(new Consumer1(queue)).start();
    }
}
class Producer1 implements Runnable{
    private final Queue<Integer> queue;
    public Producer1(Queue<Integer> queue){
        this.queue = queue;
    }
    public void run() {
        while(true){
            synchronized (queue) {
                while(queue.size() >= 10){
                    try {
                        System.out.println("queue is full,waiting...");
                        queue.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                int i = new Random().nextInt();
                System.out.println("producer:"+i);
                queue.add(i);
                queue.notifyAll();
            }
        }
    }
}
class Consumer1 implements Runnable{
    private final Queue<Integer> queue;
    public Consumer1(Queue<Integer> queue){
        this.queue = queue;
    }
    public void run() {
        while(true){
            synchronized (queue) {
                while(queue.size() == 0){
                    try {
                        System.out.println("queue is empty,waiting...");
                        queue.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                int i = queue.poll();
                System.out.println("consumer:"+i);
                queue.notifyAll();
            }
        }
    }

}


/**
 * 二、使用lock、condition、await、signal实现生产者，消费者模式
 */
public class ProducerConsumerAwaitSignalAll {
    public static void main(String[] args) {
        Lock lock = new ReentrantLock();
        Condition prodCondition = lock.newCondition();
        Condition consCondition = lock.newCondition();
        Queue<Integer> queue = new LinkedList<Integer>();
        new Thread(new Producer2(lock, prodCondition, consCondition, queue)).start();
        new Thread(new Consumer2(lock, prodCondition, consCondition, queue)).start();
    }
}

class Producer2 implements Runnable{
    private Lock lock;
    private Condition prodCondition;
    private Condition consCondition;
    private Queue<Integer> queue;
    public Producer2(Lock lock,Condition prodCondition,Condition consCondition,Queue<Integer> queue){
        this.lock = lock;
        this.prodCondition = prodCondition;
        this.consCondition = consCondition;
        this.queue = queue;
    }
    public void run() {
        while(true){
            lock.lock();
            try {
                while(queue.size() >= 10){
                    System.out.println("queue is full,waiting...");
                    prodCondition.await();
                }
                int i = new Random().nextInt();
                System.out.println("producer:"+i);
                queue.add(i);
                consCondition.signalAll();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }finally{
                lock.unlock();
            }
        }
    }
}

class Consumer2 implements Runnable{
    private Lock lock;
    private Condition prodCondition;
    private Condition consCondition;
    private Queue<Integer> queue;
    public Consumer2(Lock lock, Condition prodCondition,Condition consCondition, Queue<Integer> queue) {
        this.lock = lock;
        this.prodCondition = prodCondition;
        this.consCondition = consCondition;
        this.queue = queue;
    }
    public void run() {
        while(true){
            lock.lock();
            try {
                while(queue.size() == 0){
                    System.out.println("queue is empty,waiting...");
                    consCondition.await();
                }
                int i = queue.poll();
                System.out.println("consumer:"+i);
                prodCondition.signalAll();
            } catch (Exception e) {
                e.printStackTrace();
            }finally{
                lock.unlock();
            }
        }
    }
}


/**
 * 三、使用BlockingQueue实现生产者，消费者模式。
 * 经典的方法是使用wait和notify方法在生产者和消费者，BlockingQueue隐含的提供了这些控制，是线程安全的。
 * 可以安全地与多个生产者和多个使用者一起使用
 */
public class ProducerConsumerBlockingQueue {
    public static void main(String[] args) {
        BlockingQueue<Integer> sharedQueue = new LinkedBlockingQueue<Integer>();
        Thread prodThread = new Thread(new Producer(sharedQueue));
        Thread consThread1 = new Thread(new Consumer(sharedQueue));
        Thread consThread2 = new Thread(new Consumer(sharedQueue));
        prodThread.start();
        consThread1.start();
        consThread2.start();
    }
}
/**
 * 生产者
 */
class Producer implements Runnable{
    private final BlockingQueue<Integer> sharedQueue;
    public Producer(BlockingQueue<Integer> sharedQueue){
        this.sharedQueue = sharedQueue;
    }
    public void run() {
        for(int i= 0;i<10;i++){
            System.out.println("Producer: "+Thread.currentThread().getName()+" "+i);
            try {
                sharedQueue.put(i);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

/**
 * 消费者
 */
class Consumer implements Runnable{
    private final BlockingQueue<Integer> sharedQueue;
    public Consumer(BlockingQueue<Integer> sharedQueue){
        this.sharedQueue = sharedQueue;
    }
    public void run() {
        while(true){
            try {
                System.out.println("Consumed: "+Thread.currentThread().getName()+" "+ sharedQueue.take());
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

}