spring cloud 学习笔记0x11

[hugeterry]

断路器监控(Hystrix Dashboard)

• 在笔记0x1的基础上，在工程eurekaclient 加入Hystrix Dashboard起步依赖

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

• 在启动器上加上@EnableHystrix,@EnableHystrixDashboard,@EnableCircuitBreaker断路器相关注解

  @SpringBootApplication
  @EnableEurekaClient
  @EnableDiscoveryClient
  @RestController
  @EnableHystrix
  @EnableHystrixDashboard
  @EnableCircuitBreaker
  public class EurekaclientApplication {
  
      public static void main(String[] args) {
          SpringApplication.run(EurekaclientApplication.class, args);
      }
  
      @Value("${server.port}")
      String port;
  
      @RequestMapping("/nice")
      public String home(@RequestParam(value = "name", defaultValue = "a") String name) {
          return "hello " + name + " ,port:" + port;
      }
  
      @RequestMapping("/hi")
      @HystrixCommand(fallbackMethod = "hiError")
      public String hi(@RequestParam(value = "name", defaultValue = "hugeterry") String name) {
          return "hi " + name + " ,i am from port:" + port;
      }
  
      public String hiError(String name) {
          return "hi," + name + ",sorry,error!";
      }
  
      @Bean
      public ServletRegistrationBean getServlet() {
          HystrixMetricsStreamServlet streamServlet = new   HystrixMetricsStreamServlet();
          ServletRegistrationBean registrationBean = new   ServletRegistrationBean(streamServlet);
          registrationBean.setLoadOnStartup(1);
          registrationBean.addUrlMappings("/actuator/hystrix.stream");
          registrationBean.setName("HystrixMetricsStreamServlet");
          return registrationBean;
      }
  }

  其中getServlet是在spring cloud2 hystrix没有/actuator/hystrix.stream路径解决方式
• 访问http://localhost:8662/actuator/hystrix.stream 可看到请求数据
• 访问http://localhost:8662/hystrix , 配上http://localhost:8662/actuator/hystrix.stream 2000 hi确认，这个时候没有看到监控数据
• 访问http://localhost:8662/hi?name=wqw，再刷新Hystrix Dashboard界面，会看到监控到数据
• 更多Hystrix Dashboard 的运用可查阅https://www.cnblogs.com/happyflyingpig/p/8372485.html