rabbitmq(3)消息队列(轮询分发)
祈雨的笔记
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2018-03-25
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via 祈雨的笔记
1、模型
一个生产者绑定一个队列，对应多个消费者：
2、代码
2.1、生产者
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| private final static String QUEUE_NAME = "hello";
public static void main(String[] args) throws Exception {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("192.168.1.7");
factory.setUsername("root");
factory.setPassword("123456");
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, true, false, false, null);
for(int i=0;i<20;i++) {
String message = "Hello "+i;
channel.basicPublish("", QUEUE_NAME, null, message.getBytes());
System.out.println(" [1] Sent '" + message + "'");
}
channel.close();
connection.close();
}
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2.2、消费者1
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| private final static String QUEUE_NAME = "hello";
public static void main(String[] args) throws Exception {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("192.168.1.7");
factory.setUsername("root");
factory.setPassword("123456");
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, true, false, false, null);
System.out.println(" [1] Waiting for messages.");
Consumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties,
byte[] body) throws IOException {
String message = new String(body, "UTF-8");
System.out.println(" [1] Received '" + message + "'");
}
};
boolean autoAck = true;
channel.basicConsume(QUEUE_NAME, autoAck, consumer);
}
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2.3、消费者2
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| private final static String QUEUE_NAME = "hello";
public static void main(String[] args) throws Exception {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("192.168.1.7");
factory.setUsername("root");
factory.setPassword("123456");
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, true, false, false, null);
System.out.println(" [2] Waiting for messages.");
Consumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties,
byte[] body) throws IOException {
String message = new String(body, "UTF-8");
System.out.println(" [2] Received '" + message + "'");
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
boolean autoAck = true;
channel.basicConsume(QUEUE_NAME, autoAck, consumer);
}
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3、效果
即使消费者2的处理速度远低于消费者1，两者接收到的任务数量几乎相同，即rabbitmq将消息均匀分发给所有消费者，即使其中有的消费者闲置有的消费者高负荷。
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