前言

在Spring Cloud进阶之路 | 六：断路器（Hystrix）一文中，介绍了服务熔断降级及断路器组件。可是，这些数据终归看不到摸不着，不好监控。

所以，需要一个能针对断路器进行监控的组件，即本文要介绍的Hystrix Dashboard断路器监控组件，该组件针对各断路器的数据，提供友好的图形化界面。

准备工作

复用Spring Cloud进阶之路 | 六：断路器（Hystrix）文章中的所有工程：xmall-product、xmall-product-clients-ribbon、xmall-product-clients-feign。

ribbon方式断路器监控

改造xmall-product-clients-ribbon工程，添加相关依赖及配置。

依赖改造

添加依赖spring-boot-starter-actuator、spring-cloud-starter-netflix-hystrix-dashboard。修改后的pom文件如下。

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>com.luas.cloud</groupId>
        <artifactId>java-boot-parent-2.1</artifactId>
        <version>1.0.0-SNAPSHOT</version>
        <relativePath>../../java-boot-parent-2.1</relativePath>
    </parent>

    <groupId>com.luas.xmall</groupId>
    <artifactId>xmall-product-clients-ribbon</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <name>xmall-product-clients-ribbon</name>
    <description>product service clients by ribbon</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- nacos cloud -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

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

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

注意：一定要添加spring-boot-starter-actuator依赖，不然不会创建/actuator/hystrix.stream端点。

开启断路器监控

启动类添加@EnableHystrixDashboard注解，开启断路器监控组件。

package com.luas.xmall.product.clients;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.netflix.hystrix.EnableHystrix;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@EnableHystrix
@EnableHystrixDashboard
@SpringBootApplication
public class XmallProductClientsRibbonApplication {

    public static void main(String[] args) {
        SpringApplication.run(XmallProductClientsRibbonApplication.class, args);
    }

    @Bean
    @LoadBalanced
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

}

监控

启动工程xmall-product、xmall-product-clients-ribbon，端口分别为8080、8082。

如配置无误，控制台则会打印/actuator/hystrix.stream端点注册成功信息。

访问http://localhost:8082/actuator/hystrix.stream，如果配置正确，会出现一连串的ping。

访问http://localhost:8082/hystrix，输入相关参数如下：

点击Monitor Stream，即可开启断路器监控界面。

可以看到，两处监控均出现loading。不慌，这是因为没有数据。

访问http://localhost:8082/sku/1122，正常出现商品信息。

此时，再观察hystrix.stream，已经出现了相关数据。

hystrix监控界面已正常展示图形化界面。

控制台也显示了连接成功信息。

feign方式断路器监控

依赖改造

添加依赖spring-boot-starter-actuator、spring-cloud-starter-netflix-hystrix-dashboard。修改后的pom文件如下。

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>com.luas.cloud</groupId>
        <artifactId>java-boot-parent-2.1</artifactId>
        <version>1.0.0-SNAPSHOT</version>
        <relativePath>../../java-boot-parent-2.1</relativePath>
    </parent>

    <groupId>com.luas.xmall</groupId>
    <artifactId>xmall-product-clients-feign</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <name>xmall-product-clients-feign</name>
    <description>product service clients by ribbon</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- nacos cloud -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

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

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

注意：一定要添加spring-boot-starter-actuator依赖，不然不会创建/actuator/hystrix.stream端点。

开启断路器监控

启动类添加注解@EnableCircuitBreaker、@EnableHystrixDashboard。

package com.luas.xmall.product.clients;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
import org.springframework.cloud.openfeign.EnableFeignClients;

@EnableCircuitBreaker
@EnableHystrixDashboard
@EnableFeignClients("com.luas.xmall.product.clients.clients")
@SpringBootApplication
public class XmallProductClientsFeignApplication {

    public static void main(String[] args) {
        SpringApplication.run(XmallProductClientsFeignApplication.class, args);
    }

}

注意：虽然feign集成了hystrix，可以手动通过配置开启断路器，但是，想要开启断路器相关监控功能，还需添加@EnableCircuitBreaker注解。