使用ReentrantLock和Condition实现生产者消费者模型

使用ReentrantLock和Condition实现【生产者-消费者】。

/** * @author wzx * @time 2017/5/8 */public class ProducerConsumerSolutionUsingLock {    public static void main(String[] args) throws InterruptedException {        ProducerConsumerImpl producerConsumer = new ProducerConsumerImpl();        Thread producer = new Thread(new Producer(producerConsumer));        Thread producer2 = new Thread(new Producer(producerConsumer));        Thread producer3 = new Thread(new Producer(producerConsumer));        Thread consumer = new Thread(new Consumer(producerConsumer));        Thread consumer2 = new Thread(new Consumer(producerConsumer));        producer.start();        producer2.start();        producer3.start();        consumer.start();        consumer2.start();        TimeUnit.SECONDS.sleep(3);    }    static class ProducerConsumerImpl {        private static final int CAPACITY = 10;        private final Queue<Integer> queue = new LinkedList();        private final Random theRandom = new Random();        private final ReentrantLock lock = new ReentrantLock();        private final Condition bufferNotFull = lock.newCondition();        private final Condition bufferNotEmpty = lock.newCondition();        public void put() throws InterruptedException {            lock.lock();            try {                while (true) {                    while (queue.size() == CAPACITY) {                        System.out.println("Buffer is full, waiting");                        bufferNotEmpty.await();                    }                    int num = theRandom.nextInt();                    boolean isAdded = queue.offer(num);                    System.out.println("added " + num + " into queue");                    if (isAdded) {                        bufferNotFull.signalAll();                    }                }            } finally {                lock.unlock();            }        }        public void get() throws InterruptedException {            lock.lock();            try {                while (true) {                    while (queue.size() == 0) {                        System.out.println("Buffer is empty, waiting");                        bufferNotFull.await();                    }                    Integer num = queue.poll();                    if (num != null) {                        System.out.println("consumed " + num + " from queue");                        bufferNotEmpty.signalAll();                    }                }            } finally {                lock.unlock();            }        }    }    static class Producer implements Runnable {        private ProducerConsumerImpl producerConsumer;        public Producer(ProducerConsumerImpl producerConsumer) {            this.producerConsumer = producerConsumer;        }        @Override        public void run() {            try {                producerConsumer.put();            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }    static class Consumer implements Runnable {        private ProducerConsumerImpl producerConsumer;        public Consumer(ProducerConsumerImpl producerConsumer) {            this.producerConsumer = producerConsumer;        }        @Override        public void run() {            try {                producerConsumer.get();            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }}

执行结果：

added 1892544024 into queueadded -444311193 into queueadded 1942706941 into queueadded -258892878 into queueadded -1318716428 into queueadded 1574586774 into queueadded 1202469039 into queueadded 432139815 into queueadded 283938192 into queueBuffer is full, waitingBuffer is full, waitingBuffer is full, waitingconsumed -1898407557 from queueconsumed 1892544024 from queueconsumed -444311193 from queueconsumed 1942706941 from queueconsumed -258892878 from queueconsumed -1318716428 from queueconsumed 1574586774 from queueconsumed 1202469039 from queueconsumed 432139815 from queueconsumed 283938192 from queueBuffer is empty, waitingBuffer is empty, waiting

参考
http://javarevisited.blogspot.com/2015/06/java-lock-and-condition-example-producer-consumer.html#axzz4gOjkc8Yu