springcloud微服务学习笔记56：Bus动态刷新全局应播的设计思想和选型

springcloud微服务学习笔记目录：

新建cloud-config-client-3366
pom

<dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bus-amqp</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <dependency>
            <groupId>com.atguigu.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--监控-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--eureka client-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <!--热部署-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

 

bootstrap.yml

server:
  port: 3366

spring:
  application:
    name: config-client
  cloud:
    #Config客户端配置
    config:
      label: master #分支名称
      name: config #配置文件名称
      profile: dev #读取后缀名称 上诉3个综合就是 master分支上 config-dev.yml
      uri: http://localhost:3344

  rabbitmq: #rabbitmq相关配置，15672是web管理端口，5672是mq访问端口
    port: 5672
    host: localhost
    username: guest
    password: guest

eureka:
  client:
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/

#暴露监控端点
management:
  endpoints:
    web:
      exposure:
        include: "*"

 

主启动

@SpringBootApplication
@EnableEurekaClient
public class ConfigClientMain3366 {
    public static void main(String[] args) {
        SpringApplication.run(ConfigClientMain3366.class, args);
    }
}

 

controller

@RestController
@RefreshScope
public class ConfigClientController {

    @Value("${config.info}")
    private String configInfo;

    @GetMapping("/configInfo")
    public String getConfigInfo() {
        return configInfo;
    }
}

 

设计思想：
（1）利用消息总线触发一公客户端/bus/refresh,而刷新所有客户端的配置

（2）利用消息总线触发一个服务端ConfigServer的/bus/refresh端点，而刷新所有客户端的配置

图二更合适，图一不合适的原因：
打破了微服务的职责单一性，因为微服务本身是业务模块，它本不应该承担配置刷新的职责。
破坏了微服务各节点的对等性。
有一定的局限性。例如，微服务在迁移时，.它的网络地址常常会发生变化，此时如果想要做到自动刷新，那就会增加更多的修改