Java多线程|Java多线程 Producer and Consumer设计模式 Java多线程ProducerandConsumer设计模

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

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; }@Overridepublic 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; }}}}

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; }@Overridepublic 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; }}}}

public class Message {public Message(String data) {this.data = https://www.it610.com/article/data; }private String data; public String getData() {return data; }public void setData(String data) {this.data = data; }}

public class MessageQueue {private final static int DEFAULT_MAX_LIMIT = 100; private final LinkedList 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(); }}}

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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