Shulou(Shulou.com)06/02 Report--

This article introduces how to use RabbitMQ to achieve priority queues in Spring Boot. The content is very detailed. Interested friends can refer to it for reference. I hope it can help you.

Run RabbitMQ locally

docker run -d \--name rabbitmq \--restart always \-p 5672:5672 \-p 15672:15672 \-e RABBITMQ_DEFAULT_USER=user \-e RABBITMQ_DEFAULT_PASS=password \rabbitmq:3-management

Access the visualization panel

Address: 127.0.0.1:15672/

Account: user

Password: password

Spring Boot With RabbitMQ

Spring Boot Integration RabbitMQ

org.springframework.boot spring-boot-starter-amqp

Basic parameter configuration

# host & portspring.rabbitmq.host=127.0.0.1spring.rabbitmq.port=5672

Queue / Exchange / Routing Configuration

/** * RabbitMQ Configuration */@Configurationpublic class RabbitMQConfig { private static final String EXCHANGE = "priority-exchange"; public static final String QUEUE = "priority-queue"; private static final String ROUTING_KEY = "priority.queue.# "; /** * Define Priority Queue */ @Bean Queue queue() { Map args= new HashMap(); args.put("x-max-priority", 100); return new Queue(QUEUE, false, false, false, args); } /** * definition exchanger */ @Bean TopicExchange exchange() { return new TopicExchange(EXCHANGE); } @Bean Binding binding(Queue queue, TopicExchange exchange) { return BindingBuilder.bind(queue).to(exchange).with(ROUTING_KEY); }}

Priority queue definition refer to official document: www.rabbitmq.com/priority.html

Spring Boot 应用启动后，会自动创建 Queue 和 Exchange ，并相互绑定，优先级队列会有如图所示标识。

RabbitMQ Publisher

Spring Boot 相关配置

# 是否开启消息发送到交换器（Exchange）后触发回调spring.rabbitmq.publisher-confirms=false# 是否开启消息发送到队列（Queue）后触发回调spring.rabbitmq.publisher-returns=false# 消息发送失败重试相关配置spring.rabbitmq.template.retry.enabled=truespring.rabbitmq.template.retry.initial-interval=3000msspring.rabbitmq.template.retry.max-attempts=3spring.rabbitmq.template.retry.max-interval=10000msspring.rabbitmq.template.retry.multiplier=1

发送消息

@Component@AllArgsConstructorpublic class FileMessageSender { private static final String EXCHANGE = "priority-exchange"; private static final String ROUTING_KEY_PREFIX = "priority.queue."; private final RabbitTemplate rabbitTemplate; /** * 发送设置有优先级的消息 * * @param priority 优先级 */ public void sendPriorityMessage(String content, Integer priority) { rabbitTemplate.convertAndSend(EXCHANGE, ROUTING_KEY_PREFIX + "test", content, message -> { message.getMessageProperties().setPriority(priority); return message; }); }}RabbitMQ Consumer

Spring Boot 相关配置

# 消息接收确认，可选模式：NONE（不确认）、AUTO（自动确认）、MANUAL（手动确认）spring.rabbitmq.listener.simple.acknowledge-mode=AUTO# 最小线程数量spring.rabbitmq.listener.simple.concurrency=10# 最大线程数量spring.rabbitmq.listener.simple.max-concurrency=10# 每个消费者可能未完成的最大未确认消息数量spring.rabbitmq.listener.simple.prefetch=1

消费者执行耗时较长的话，建议 spring.rabbitmq.listener.simple.prefetch 设置为较小数值，让优先级越高的消息更快加入到消费者线程。

监听消息

@Slf4j@Componentpublic class MessageListener { /** * 处理消息 */ @RabbitListener(queues = "priority-queue") public void listen(String message) { log.info(message); }}番外补充

1、自定义消息发送确认的回调

配置如下：

# 开启消息发送到交换器（Exchange）后触发回调spring.rabbitmq.publisher-confirms=true# 开启消息发送到队列（Queue）后触发回调spring.rabbitmq.publisher-returns=true

自定义

RabbitTemplate.ConfirmCallback

实现类

@Slf4jpublic class RabbitConfirmCallBack implements RabbitTemplate.ConfirmCallback{ @Override public void confirm(CorrelationData correlationData, boolean ack, String cause) { log.info("消息唯一标识: {}", correlationData); log.info("确认状态: {}", ack); log.info("造成原因: {}", cause); }}

自定义

RabbitTemplate.ConfirmCallback

实现类

@Slf4jpublic class RabbitReturnCallback implements RabbitTemplate.ReturnCallback { @Override public void returnedMessage(Message message, int replyCode, String replyText, String exchange, String routingKey) { log.info("消息主体: {}", message); log.info("回复编码: {}", replyCode); log.info("回复内容: {}", replyText); log.info("交换器: {}", exchange); log.info("路由键: {}", routingKey); }}

配置 rabbitTemplate

@Component@AllArgsConstructorpublic class RabbitTemplateInitializingBean implements InitializingBean { private final RabbitTemplate rabbitTemplate; @Override public void afterPropertiesSet() { rabbitTemplate.setConfirmCallback(new RabbitConfirmCallBack()); rabbitTemplate.setReturnCallback(new RabbitReturnCallback()); } }关于Spring Boot中怎么利用RabbitMQ实现优先级队列就分享到这里了，希望以上内容可以对大家有一定的帮助，可以学到更多知识。如果觉得文章不错，可以把它分享出去让更多的人看到。

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.