14.Hystrix -电商系统集成Hystrix（基础组件Dashboard+开放微服务端点）

1.在platform下创建模块hystrix-dashboard

2. pom配置

<?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">
    <parent>
        <artifactId>foodie-cloud</artifactId>
        <groupId>com.imooc</groupId>
        <version>1.0-SNAPSHOT</version>
        <relativePath>../../pom.xml</relativePath>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>hystrix-dashboard</artifactId>
    <dependencies>
        <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-netflix-hystrix</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <mainClass>com.imooc.HystrixDashboardApplication</mainClass>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

3. application.yml

平台组件的端口往后移注册中心20000,、Turbine的20001、Dashboard的20002

spring:
  application:
    name: hystrix-dashboard

server:
  port: 20002

4. HystrixDashboardApplication

@SpringCloudApplication
@EnableHystrixDashboard

package com.imooc;

import org.springframework.boot.SpringApplication;
import org.springframework.cloud.client.SpringCloudApplication;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;

@SpringCloudApplication
@EnableHystrixDashboard
public class HystrixDashboardApplication {
    public static void main(String[] args) {
        SpringApplication.run(HystrixDashboardApplication.class, args);
    }
}

4.要把Hystrix所有的端点暴露出来

是通过actuator来暴露的
依赖已经加到了foodie-cloud-web-components微服务中了，所以其他微服务都已经加载了这个依赖
所有微服务的web微服务基本上是加载了actuator的

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

5.微服务foodie-user-web把端点开放出来

开启所有actuator-endpoint
在application-dev.yml中添加配置

## 开启所有actuator-endpoint
management:
  endpoint:
    health:
      show-details: always
  endpoints:
    web:
      exposure:
#生产环境下不能配置 '*'
        include: '*'
  #        include: health, info, xxxx
  security:
    enabled: false

6.添加Hystrix依赖及配置

1.完成1-5的配置步骤还，其实还并没有暴露Hystrix的端点
2.Hystrix可以使用在foodie-user-web当中，也可以使用在foodie-user-service当中
3.这里把hystrix配置到service中，步骤如下

添加下面的hystrix依赖到foodie-user-service 的pom中。同样的把下面的依赖及actuator-endpoint配置到别的微服务当中，如foodie-order-service的pom和application-dev.yml中

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

列表第二项