消息总线SpringCloud Bus-蒲公英云

消息总线SpringCloud Bus

文章目录

- 消息总线SpringCloud Bus
- - RabbitMQ 实现消息总线
  - - 快速入门
    - 整合 Spring Cloud Bus
  - kafka 实现消息总线
  - - 快速入门

RabbitMQ 实现消息总线

快速入门

新建 rabbitmq-hello 项目

pom 依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.zk.springcloud.rabbitmq</groupId>
    <artifactId>springcloud-rabbitmq</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>springcloud-rabbitmq</name>
    <description>Demo project for Spring Boot</description>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-amqp</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

application.properties

spring.application.name=rabbitmq-hello
spring.rabbitmq.host=localhost
spring.rabbitmq.port=5672
spring.rabbitmq.username=springcloud
spring.rabbitmq.password=123456

创建消息生产者

package com.zk.springcloud.rabbitmq;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.util.Date;
@Component
public class Sender { 
    @Autowired
    AmqpTemplate rabbitTemplate;
    public void send(){ 
        String context = "hello " + new Date();
        System.out.println("Sender : " + context);
        this.rabbitTemplate.convertAndSend("hello",context);
    }
}

创建消息消费者

package com.zk.springcloud.rabbitmq;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;
@Component
@RabbitListener(queues = "hello")
public class Receiver { 
    @RabbitHandler
    public void process(String hello) { 
        System.out.println("Receiver : " + hello);
    }
}

创建 RabbitMQ 的配置类 RabbitConfig

package com.zk.springcloud.rabbitmq;
import org.springframework.amqp.core.Queue;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class RabbitConfig { 
    @Bean
    public Queue helloQueue(){ 
        return new Queue("hello");
    }
}

应用主类

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class SpringcloudRabbitmqApplication { 
    public static void main(String[] args) { 
        SpringApplication.run(SpringcloudRabbitmqApplication.class, args);
    }
}

单元测试类，用来调用消息生产

package com.zk.springcloud.rabbitmq;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringcloudRabbitmqApplicationTests { 
    @Autowired
    private Sender sender;
    @Test
    public void contextLoads() { 
        sender.send();
    }
}

启动应用主类，在控制台看到如下内容：

2018-10-15 10:59:17.592  INFO 30292 --- [cTaskExecutor-1] o.s.a.r.c.CachingConnectionFactory       : Created new connection: rabbitConnectionFactory#32c726ee:0/SimpleConnection@54c28ee5 [delegate=amqp://springcloud@127.0.0.1:5672/, localPort= 46069]

同时，通过 RabbitMQ 控制面板，看到 Connections 和 Channels 中包含当前连接的条目

运行单元测试类，在控制台输出如下内容：

Sender : hello Mon Oct 15 11:10:36 CST 2018

在应用主类的控制台，输出如下内容：

Receiver : hello Mon Oct 15 11:10:36 CST 2018

整合 Spring Cloud Bus

也可以将 SpringCloudBus 放在 config 9012 进行配置和刷新配置

config-client 9013 项目添加依赖，用来刷新端点

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bus-amqp</artifactId>
        </dependency>

在配置文件中添加关于 RabbitMQ 的链接和用户信息

spring.rabbitmq.host=localhost
spring.rabbitmq.port=5672
spring.rabbitmq.username=springcloud
spring.rabbitmq.password=123456

启动 config 9012 再启动 config-client 9013 ，可以在 config-client 控制台看到多了 /bus/refresh 请求

2018-10-15 11:16:35.060  INFO 32424 --- [           main] s.b.a.e.w.s.WebMvcEndpointHandlerMapping : Mapped "{[/actuator/bus-refresh/{destination}],methods=[POST]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.web.servlet.AbstractWebMvcEndpointHandlerMapping$OperationHandler.handle(javax.servlet.http.HttpServletRequest,java.util.Map<java.lang.String, java.lang.String>)
2018-10-15 11:16:35.060  INFO 32424 --- [           main] s.b.a.e.w.s.WebMvcEndpointHandlerMapping : Mapped "{[/actuator/bus-refresh],methods=[POST]}" onto public java.lang.Object

访问 http://localhost:9013/from 返回 git-default-1.0
修改 git 仓库 config-repo/didispace.properties 为 git-default-2.0 ，并发送 POST 请求 http://localhost:9013/actuator/bus-refresh
再访问 http://localhost:9013/from 返回 git-default-2.0

已经能够通过 Spring Cloud Bus 来更新总线上的属性配置了。

kafka 实现消息总线

快速入门

kafka在windows上的安装、运行

修改 config-client 9013 上的依赖，将 spring-cloud-starter-bus-amqp 替换成 spring-cloud-starter-bus-kafka

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bus-kafka</artifactId>
        </dependency>

kafka 采用默认配置，启动 config-client 9013 查看日志，订阅了名为 springCloudBus 的 Topic

o.s.c.s.b.k.KafkaMessageChannelBinder$1  : partitions assigned: [springCloudBus-0]

访问 http://localhost:9013/from 返回 git-default-1.0
修改 git 仓库 config-repo/didispace.properties 为 git-default-2.0 ，并发送 POST 请求 http://localhost:9013/actuator/bus-refresh
再访问 http://localhost:9013/from 返回 git-default-2.0

config-client 9013 查看日志

com.netflix.discovery.DiscoveryClient    : Saw local status change event StatusChangeEvent [timestamp=1539586923629, current=UP, previous=DOWN]
o.s.cloud.bus.event.RefreshListener      : Received remote refresh request. Keys refreshed [config.client.version, from]