RabbitMQ学习12延迟队列

1、从官网链接下载插件：

Releases · rabbitmq/rabbitmq-delayed-message-exchange (github.com)

本文下载的是3.9.0版本。

2、安装插件

将下载的文件rabbitmq_delayed_message_exchange-3.9.0.ez，上传到服务器rabbitmq的安装目录下，执行如下命令：

cd /usr/lib/rabbitmq/lib/rabbitmq_server-3.9.8/plugins/
rabbitmq-plugins enable rabbitmq_delayed_message_exchange

3、重启rabbitmq

service rabbitmq-server restart

4、验证插件是否已安装

重新刷新15672端口的管理界面，在交换机页面，可以看到，增加了一种x-delayed-message的消息类型：

5、使用SpringBoot实现延迟队列

先使用idea建立一个spring boot 的项目，并在pom中添加如下依赖：

<dependencies>
<!--RabbitMQ 依赖-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-amqp</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.47</version>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
    </dependency>
    <!--swagger-->
    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-swagger2</artifactId>
        <version>2.9.2</version>
    </dependency>
    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-swagger-ui</artifactId>
    <version>2.9.2</version>
    </dependency>
    <!--RabbitMQ 测试依赖-->
    <dependency>
        <groupId>org.springframework.amqp</groupId>
        <artifactId>spring-rabbit-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

application.yml文件配置：

spring:
  rabbitmq:
    host: ubu
    port: 5672
    username: admin
    password: 123456
    virtual-host: /

swagger配置类：

package com.yas.rabbitmqboot.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Contact;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

@Configuration
@EnableSwagger2
public class SwaggerConfig {
    @Bean
    public Docket webApiConfig() {
        return new Docket(DocumentationType.SWAGGER_2)
                .groupName("webApi")
                .apiInfo(webApiInfo())
                .select()
                .build();
    }

    private ApiInfo webApiInfo() {
        return new ApiInfoBuilder()
                .title("rabbitmq 接口文档")
                .description("本文档描述了 rabbitmq 微服务接口定义")
                .version("1.0")
                .contact(new Contact("asenyang", "http://asenyang.com", "123456@qq.com")).build();
    }
}

生产者代码：

package com.yas.rabbitmqboot.listen;

import com.rabbitmq.client.Channel;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.IOException;
import java.util.Date;
import java.util.concurrent.TimeUnit;

@RestController
@Slf4j
@RequestMapping("/ttl")
public class DelayedController {

    public static final String DELAYED_EXCHANGE_NAME = "delayed.exchange";
    public static final String DELAYED_ROUTING_KEY = "delayed.routingkey";

    @Autowired
    RabbitTemplate rabbitTemplate;

    @GetMapping("/sendDelayMsg/{message}/{delayTime}")
    public void sendMsg(@PathVariable String message, @PathVariable Integer delayTime) {
        rabbitTemplate.convertAndSend(DELAYED_EXCHANGE_NAME, DELAYED_ROUTING_KEY, message,
                correlationData -> {
                    correlationData.getMessageProperties().setDelay(delayTime);
                    return correlationData;
                });
        log.info(" 当 前 时 间 ： {}, 发 送 一 条 延 迟 {} 毫秒的信息给队列 delayed.queue:{}", new Date(), delayTime, message);
    }
}

消费者代码：

package com.yas.rabbitmqboot.listen;

import com.rabbitmq.client.Channel;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.io.IOException;
import java.util.Date;
import java.util.concurrent.TimeUnit;

@Component
@Slf4j
public class DelayedConsumer {

    public static final String DELAYED_QUEUE_NAME = "delayed.queue";

    @RabbitListener(queues = DELAYED_QUEUE_NAME)
    public void receiveDelayedQueue(Message message) {
        String msg = new String(message.getBody());
        log.info("当前时间：{},收到延时队列的消息：{}", new Date().toString(), msg);
    }
}

测试：

使用postman请求如下地址：

http://localhost:8080/ttl/sendDelayMsg/hello1/20000
http://localhost:8080/ttl/sendDelayMsg/hello2/2000

在控制台查看效果：