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producer是生产者的意思：指生产数据的线程， -
consumer是消费者的意思：指的是使用数据的线程
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public class ProducerThread extends Thread { private final static Random random = new Random(System.currentTimeMillis()); private final static AtomicInteger counter = new AtomicInteger(0); private final MessageQueue messageQueue; public ProducerThread(MessageQueue messageQueue, int seq) { super("Producer-" + seq); this.messageQueue = messageQueue; } @Override public void run() { while (true) { try { Message message = new Message("Message-" + counter.getAndIncrement()); messageQueue.put(message); System.out.println(Thread.currentThread().getName() + " put message " + message.getData()); Thread.sleep(random.nextInt(1000)); } catch (InterruptedException e) { break; } } }} |
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public class ConsumerThread extends Thread { private final static Random random = new Random(System.currentTimeMillis()); private final MessageQueue messageQueue; public ConsumerThread(MessageQueue messageQueue, int seq) { super("Consumer-" + seq); this.messageQueue = messageQueue; } @Override public void run() { while (true) { try { Message message = messageQueue.take(); System.out.println(Thread.currentThread().getName() + " take a message " + message.getData()); Thread.sleep(random.nextInt(1000)); } catch (InterruptedException e) { break; } } }} |
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public class Message { public Message(String data) { this.data = data; } private String data; public String getData() { return data; } public void setData(String data) { this.data = data; }} |
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public class MessageQueue { private final static int DEFAULT_MAX_LIMIT = 100; private final LinkedList<Message> queue; private final int limit; public MessageQueue() { this(DEFAULT_MAX_LIMIT); } public MessageQueue(final int limit) { this.limit = limit; this.queue = new LinkedList<>(); } public void put(final Message message) throws InterruptedException { synchronized (queue) { while (queue.size() > limit) { queue.wait(); } queue.addLast(message); queue.notifyAll(); } } public Message take() throws InterruptedException { synchronized (queue) { while (queue.isEmpty()) { queue.wait(); } Message message = queue.removeFirst(); queue.notifyAll(); return message; } } public int getMaxLimit() { return this.limit; } public int getMessageSize() { synchronized (queue) { return queue.size(); } }} |
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public class ProducerAndConsumerClient { public static void main(String[] args) { final MessageQueue messageQueue = new MessageQueue(); new ProducerThread(messageQueue, 1).start(); new ProducerThread(messageQueue, 2).start(); new ProducerThread(messageQueue, 3).start(); new ConsumerThread(messageQueue, 1).start(); new ConsumerThread(messageQueue, 2).start(); }} |
Producer-1 put message Message-0
Producer-3 put message Message-2
Producer-2 put message Message-1
Consumer-1 take a message Message-0
Consumer-2 take a message Message-1
Producer-2 put message Message-3
Consumer-1 take a message Message-2
Producer-2 put message Message-4
Consumer-2 take a message Message-3
Producer-3 put message Message-5
Producer-3 put message Message-6
Producer-3 put message Message-7
Consumer-1 take a message Message-4
Producer-2 put message Message-8
Consumer-2 take a message Message-5
Producer-3 put message Message-9
Producer-1 put message Message-10
Producer-1 put message Message-11
Producer-2 put message Message-12
省略...
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原文链接：https://juejin.cn/post/7023247132865855524
