15Feign整合断路器监控Hystrix-Dashboard

公众号：java 乐园

Ribbon 可以整合整合断路器监控 Hystrix Dashboard，Feign 也不能少, 本篇讲解一下 Feign 如何整合断路器监控 Hystrix Dashboard。本篇主要整合 sc-eureka-client-consumer-feign-hystrix 项目和 sc-hystrix-dashboard 项目。

1、新建项目 sc-feign-hystrix-dashboard，对应的 pom.xml 文件如下

<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>spring-cloud</groupId>
  <artifactId>sc-feign-hystrix-dashboard</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>sc-feign-hystrix-dashboard</name>
  <url>http://maven.apache.org</url>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
    </parent>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

        </dependencies>
    </dependencyManagement>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>
    
        <!-- 说明是一个 eureka client -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        
        <!-- <dependency> 
                <groupId>org.springframework.cloud</groupId> 
                <artifactId>spring-cloud-starter-feign</artifactId> 
                <version>1.4.5.RELEASE</version> 
           </dependency> -->

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        
        
        <!-- <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>
            <version>1.4.5.RELEASE</version>
        </dependency> -->


        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
        </dependency>


        <!-- <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-hystrix</artifactId>
            <version>1.4.5.RELEASE</version>
        </dependency> -->
        
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>
        
        
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
        
    </dependencies>
</project>

说明：可以看出这个 pom.xml 文件是 sc-eureka-client-consumer-feign-hystrix 项目和 sc-hystrix-dashboard 项目的并集。

2、新建 spring root 启动类 FeignDashboardApplication.java

package sc.consumer;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
import org.springframework.cloud.openfeign.EnableFeignClients;

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

}

这个启动类的注解是 sc-eureka-client-consumer-feign-hystrix 项目和 sc-hystrix-dashboard 项目的并集
3、其他项目文件说明如下，具体见源码

4、启动注册中心 sc-eureka-server 和服务提供者 sc-eureka-client-provider，并确保启动成功

5、启动 sc-feign-hystrix-dashboard 项目，并验证是否启动成功
方式一：访问注册中心查看 sc-feign-hystrix-dashboard 项目配置的服务名是否注册成功

方式二：访问仪表盘 Dashboard 对的地址 http://127.0.0.1:5800/hystrix

6、使用 Hystrix Dashboard 查看服务情况
在下图标注处输入 http://127.0.0.1:5800/hystrix.stream

然后点击 Monitor Stream 按钮

7、使用 postman 访问任意服务接口，以访问获取用户信息接口为例
http://127.0.0.1:5800/feign/user/getUser/3

尽量多访问几次，然后查看仪表盘 Bashboard 监控后台，发现之前一直处于 Loading 的界面发生了变化，如下图，图中单元具体含义可以访问网站
https://github.com/Netflix-Sk…

访问 http://127.0.0.1:5800/hystrix.stream 也出现大量数据，这些数据就是对服务的监控数据。