# springcloud-chapter05-02

**Repository Path**: Vakishim/springcloud-chapter05-02

## Basic Information

- **Project Name**: springcloud-chapter05-02
- **Description**: 第5章 容错服务 教材P70，P74
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 61
- **Created**: 2024-10-25
- **Last Updated**: 2024-10-25

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# springcloud-chapter05-01

#### 介绍
第五章服务容错保护库 Hystrix  
基于Feign中使用
教材P70 Feign组件包含了Hystrix 熔断功能，但需要配置启用  
需要**重点掌握**  
#### 软件架构
基于Feign实现类图

![](doc/hystrix-client.png)

#### 安装教程

Feign客户端配置

```yaml
server:
  port: 8764
spring:
  application:
    name: eureka-hystrix-client
eureka:
  client:
    service-url:
      defaultZone: http://localhost:7000/eureka/
    instance:
      hostname: localhost
feign:
  hystrix:
    enabled: true
```

1. 运行 Eureka Server
2. 运行 hello-provider
3. 运行 eureka-hystrix-client,发请求测试效果
4. 停止 hello-provider
5. 发请求测试效果

#### 效果

![](./doc/1-1.png)

停止 hello-provider 后的效果
![](./doc/1-2.png)

### Hystrix Dashboard 监控

> eureka-hystrix-client 下 pom.xml 添加 

```xml
		<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-actuator</artifactId>
		</dependency>
```
> 主程序添加注解  EurekaHystrixClientApplication

```java
@SpringBootApplication
@EnableFeignClients
@EnableEurekaClient
@EnableHystrixDashboard
public class EurekaHystrixClientApplication {

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

}

```

>添加配置类 HystrixDashboardConfiguration  

```java
@Configuration
public class HystrixDashboardConfiguration {
    @Bean
    public ServletRegistrationBean getServlet() {
        HystrixMetricsStreamServlet streamServlet = new
                HystrixMetricsStreamServlet();
        ServletRegistrationBean registrationBean = new
                ServletRegistrationBean(streamServlet);
        registrationBean.setLoadOnStartup(1);
        registrationBean.addUrlMappings("/hystrix.stream");
        registrationBean.setName("HystrixMetricsStreamServlet");
        return registrationBean;
    }
}

```

#### 监控效果图

![](doc/2-1.png)

![](doc/2-2.png)