SpringCloud第五篇-Hystrix Dashboard

Hystrix Dashboard简介

Hystrix Dashboard是作为断路器状态的一个组件，提供了数据监控和友好的图形化界面。在微服务架构中为例保证程序的可用性，防止程序出错导致网络阻塞，出现了断路器模型。断路器的状况反应了一个程序的可用性和健壮性，它是一个重要指标。

在我的第四篇文章断路器讲述了如何使用断路器，并简单的介绍了下Hystrix Dashboard组件，这篇文章更加详细的介绍Hystrix Dashboard。

项目准备

• servic-hystrix-dashboard：新建项目
• 拷贝service-hello项目的pom,yml,java文件到该项目中

断路器监控的配置

java类的注解配置

主程序的类名Application修改为HystrixDashboardApplication

pom

<?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">    <groupId>comm.bamboo</groupId>    <version>1.0-SNAPSHOT</version>    <artifactId>servic-hystrix-dashboard</artifactId>    <packaging>jar</packaging>    <name>servic-hystrix-dashboard</name>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.5.2.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.cloud</groupId>            <artifactId>spring-cloud-starter-eureka</artifactId>        </dependency>        <!--断路器监控，必不可少的三个依赖-->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-actuator</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-hystrix</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>    </dependencies>    <dependencyManagement>        <dependencies>            <dependency>                <groupId>org.springframework.cloud</groupId>                <artifactId>spring-cloud-dependencies</artifactId>                <version>Dalston.RC1</version>                <type>pom</type>                <scope>import</scope>            </dependency>        </dependencies>    </dependencyManagement>    <build>        <plugins>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>            </plugin>        </plugins>    </build>    <repositories>        <repository>            <id>spring-milestones</id>            <name>Spring Milestones</name>            <url>https://repo.spring.io/milestone</url>            <snapshots>                <enabled>false</enabled>            </snapshots>        </repository>    </repositories></project>

以下三个依赖必加，缺一不可(重点)

<!--新增的保护模式处理配置部分：暴露各种指标-->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-actuator</artifactId>        </dependency>        <!-- hystrix和 HystrixDashboard 依赖包 -->        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-hystrix</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>        </dependency>

yml

server:  port: 8762spring:  application:    name: service-hystrix-dashboardeureka:  client:    serviceUrl:      defaultZone: http://localhost:8761/eureka/

java类

在程序的入口HystrixDashboardApplication类，

• 加上@EnableHystrix注解开启断路器，这个是必须的
• 加上@EnableHystrixDashboard注解，开启HystrixDashboard
• 并且需要在程序中的接口名上加上@HystrixCommand注解声明断路点和异常回调方法

package com.bamboo;import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;import org.springframework.beans.factory.annotation.Value;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;import org.springframework.cloud.netflix.hystrix.EnableHystrix;import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.RestController;/** * * 服务端service-hystrix-dashboard * 增加断路器和断路器的监控 * * service-hystrix-dashboard Application */@SpringBootApplication@EnableEurekaClient@RestController@EnableHystrix//添加断路器的注解@EnableHystrixDashboard//添加断路器监控注解public class HystrixDashboardApplication {    public static void main(String... args) throws Exception {        SpringApplication.run(HystrixDashboardApplication.class, args);    }    @Value("${server.port}")    String port;    @RequestMapping("/hello")    @HystrixCommand(fallbackMethod = "helloError")//明断路点和回调方法名    public String home() {        return "hello from port:" +port;    }    //异常处理的回调方法    public String helloError() {        return "hello Error,sorry,error!";    }}

运行并查看结果

• 惯例先运行eureka-server
• 在运行当前的service-hystrix-dashboard

可以在http://localhost:8761/看到服务都已经其起来了
- 先运行一次http://localhost:8762/hello接口服务，运行成功返回字符串（很多教程没有这一步，后面的数据只能看得到ping字符串啥都没，至少我这个版本是如此）
- 在访问http://localhost:8762/hystrix.stream，可以看到返回的数据，如下图1
- 在控制台页面查看曲线图面板，如图2，填好后点击monitor stream按钮可以看到图三

图1

图2

图3