RabbitMQ优先级队列实战

偏执的太偏执、 2021-07-24 14:15 563阅读 0赞

**一 代码**

package com.rabbitmq.priority;
    
    import com.rabbitmq.client.AMQP;
    import com.rabbitmq.client.Channel;
    import com.rabbitmq.client.Connection;
    import com.rabbitmq.client.ConnectionFactory;
    import com.rabbitmq.util.ConnectionUtils;
    import java.io.IOException;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.concurrent.TimeoutException;
    
    // 消息优先级消费
    public class PriorityQueue {
        private static final String IP_ADDRESS = "127.0.0.1";
        private static final int PORT = 5672;//RabbitMQ（AMQP） 服务端默认端口号为 5672
    
        public static void main(String[] args) throws IOException,
                TimeoutException {
            ConnectionFactory factory = new ConnectionFactory();
            factory.setHost(IP_ADDRESS);
            factory.setUsername("root");
            factory.setPassword("123456");
            Connection connection = factory.newConnection();
            Channel channel = connection.createChannel();
    
            channel.exchangeDeclare("exchange.priority", "direct", true, false, null);
            Map<String, Object> arg = new HashMap<String, Object>(3);
            arg.put("x-max-priority", 10);
            channel.queueDeclare("queue.priority", true, false, false, arg);
            channel.queueBind("queue.priority", "exchange.priority", "routingKey");
            String message = "Hello World  10!";
            AMQP.BasicProperties.Builder builder = new AMQP.BasicProperties.Builder();
            builder.priority(10);
            AMQP.BasicProperties properties = builder.build();
            // 消息发布
            // 第三个参数为mandatory
            channel.basicPublish("exchange.priority", "routingKey", false,
                    properties, message.getBytes());
            ConnectionUtils.close(channel, connection);
        }
    }

**二 测试**

1 优先级队列特性标志

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

2 消息已经发到优先级队列

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1][]

**三 参考代码**

[https://github.com/cakin24/RabbitMQDemo/tree/master/src/main/java/com/rabbitmq/priority][https_github.com_cakin24_RabbitMQDemo_tree_master_src_main_java_com_rabbitmq_priority]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70]: /images/20210724/98cfb04c853b49029f725cb2593381a8.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1]: /images/20210724/5e76e48008d74f218a5c9451e6b87653.png
[https_github.com_cakin24_RabbitMQDemo_tree_master_src_main_java_com_rabbitmq_priority]: https://github.com/cakin24/RabbitMQDemo/tree/master/src/main/java/com/rabbitmq/priority