springcloud实战之8 断路器-仪表盘-单例监控（Hystrix）

r囧r小猫 2022-06-03 05:16 186阅读 0赞

Spring Cloud不但跟Hystrix能够做到优雅的整合，还能够整合他的仪表盘组件Hystrix Dashboard，它主要用来实时监控Hystrix的各项指标信息。通过Hystrix Dashboard反馈的实时信息，可以帮助我们快速发现系统中存在的问题，从而及时的采取应对措施。

在Spring Cloud中构建Hystrix Dashboard非常简单。

## 创建工程（springcloud-hystirx-dashboard） ##

### 添加依赖 ###

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
        <relativePath />
    </parent>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${version.springcloud}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <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>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>

### 创建配置文件 ###

spring:
      application:
        name: springcloud-hystrix-dashboard
    server:
      port: 8005
    
    eureka:
      client:
        service-url:
          defaultZone: http://peer1:8080/eureka/
      instance:
          lease-renewal-interval-in-seconds: 45 # 用于定义服务续约任务的调用间隔时间，默认30秒
          lease-expiration-duration-in-seconds: 90  # 用于定义服务失效的时间 ，默认90秒

### 创建入口文件 ###

@SpringBootApplication
    @EnableDiscoveryClient
    @EnableHystrixDashboard
    @EnableCircuitBreaker // 开启断路器功能
    public class SpringCloudHystrixDashboardApplication { 
    
        public static void main(String[] args) {
            new SpringApplicationBuilder(SpringCloudHystrixDashboardApplication.class)
                    .web(true)
                    .run(args) ;
        }
    }

### 编写config文件 ###

@Configuration
    public class BeanConfig { 
    
        @Bean
        @LoadBalanced  // 开启服务端负载均衡
        RestTemplate restTemplate(){
            return new RestTemplate();
        }
    }

### 编写service接口 ###

@Service("restfulSerivce")
    public class RestfulServiceImpl { 
    
        @Autowired private RestTemplate restTemplate ;
    
        /** * 定义服务降级逻辑(serviceFallback) * 并且自动的实现了线程调用得依赖隔离-实现线程池的隔离， * 为每一个依赖服务创建一个独立的线程池，这样就算某一个依赖服务出现延迟过高 * 的情况，也只是对该依赖服务的调用产生影响，而不会拖慢其他的服务。 * * Hystrix会将请求结果放入缓存，默认缓存key既是请求参数 */
        @HystrixCommand(fallbackMethod = "serviceFallback")
        public String getRestData(){
            return restTemplate.getForObject("http://springcloud-producer-rest/api/rest/info",String.class) ;
        }
    
        public String serviceFallback() {
            return "hi,sorry,error!";
        }
    }

### 编写web层接口 ###

@RestController
    @RequestMapping("/api/rest")
    public class RestfulController { 
    
        @Autowired private RestfulServiceImpl restfulService ;
    
        @Value("${server.port}")
        String port ;
        @Value("${spring.application.name}")
        String name ;
    
        @RequestMapping("/home")
        public String home(){
            return "I am info from port("+port+") from application name("+name+") invoke other service." + "\n"
                    +restfulService.getRestData();
        }
    }

## 启动工程 ##

1.启动Eureka Server集群项目

2.启动springcloud-hystirx-dashboard项目

服务注册效果图  
![这里写图片描述][SouthEast]

![这里写图片描述][SouthEast 1]

注意：要想看到第二张图的效果，必须先访问一次接口，才能对接口访问情况进行监控

## 源码 ##

[springcloud-hystirx-dashboard][]

## 历史文章 ##

[springcloud实战之技术选型：dubbo还是springcloud][springcloud_dubbo_springcloud]

[springboot实战之服务消费者（ribbon）][springboot_ribbon]

[springcloud实战之服务消费者（Feign）][springcloud_Feign]

[springcloud实战之服务注册与发现（eureka实现）][springcloud_eureka]

[springcloud实战之高可用服务注册中心（eureka集群）][springcloud_eureka 1]

[springcloud实战之断路器（Hystrix）][springcloud_Hystrix]

[SouthEast]: /images/20220603/1db464cd839c46e7bdfd8c87a140953c.png
[SouthEast 1]: /images/20220603/61e6b933cf0749449dea4f1e95466541.png
[springcloud-hystirx-dashboard]: https://github.com/shiyuan2he/springcloud/tree/master/springcloud-hystirx-dashboard
[springcloud_dubbo_springcloud]: http://blog.csdn.net/u012806787/article/details/78789312
[springboot_ribbon]: http://blog.csdn.net/u012806787/article/details/78796605
[springcloud_Feign]: http://blog.csdn.net/u012806787/article/details/78798951
[springcloud_eureka]: http://blog.csdn.net/u012806787/article/details/78790958
[springcloud_eureka 1]: http://blog.csdn.net/u012806787/article/details/78793639
[springcloud_Hystrix]: http://blog.csdn.net/u012806787/article/details/78801119