Java多執行緒18 Producer and Consumer設計模式
摘要：
Java多執行緒目錄
public class ProducerThread extends Thread {
private final static Random random = new Random(System.currentTimeMi...
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;
}
}
}
}
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;
}
}
}
}
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;
}
}
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();
}
}
}
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...