博客详情

2018-10-01

4109

原创

一、Hystrix Dashboard 简介

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。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。

二、监控环境搭建

本文的的工程，来源于第一篇文章的例子，复制成新工工程，在它的基础上进行改造。

1. service-hi 改造

1. pom.xml

在pom的工程文件引入相应的依赖：

<?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.gf</groupId>
	<artifactId>service-hi</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>service-hi</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>com.gf</groupId>
		<artifactId>chapter11</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<!-- 本文需要添加的新的依赖 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
		</dependency>

	</dependencies>


</project>

2. application.yml

server:
  port: 8762

spring:
  application:
    name: service-hi
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/
management:
  endpoints:
    web:
      exposure:
        include: "*"
      cors:
        allowed-origins: "*"
        allowed-methods: "*"

3. 主启动类 ServiceHiApplication

在程序的入口ServiceHiApplication类，加上@EnableHystrix注解开启断路器，这个是必须的，并且需要在程序中声明断路点HystrixCommand；加上@EnableHystrixDashboard注解，开启HystrixDashboard

package com.gf;

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.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.hystrix.EnableHystrix;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@EnableEurekaClient
@SpringBootApplication
@RestController
@EnableHystrix
@EnableHystrixDashboard
public class ServiceHiApplication {

	/**
	 * 访问地址 http://localhost:8762/actuator/hystrix.stream
	 */

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

	@Value( "${server.port}" )
	private String port;

	@GetMapping("/hi")
	@HystrixCommand(fallbackMethod = "hiError")
	public String hi() {
		return "hello , port is " + port;
	}

	public String hiError() {
		return "sorry, server error";
	}

}

运行程序：依次开启eureka-server 和service-hi