服务熔断、降级--Hystrix

1.导入依赖

2.添加注解

在方法上或者Controller中的路径上添加注解@HystrixCommand(fallbackMethod = “dept_TimeoutHandler”）

3.激活熔断器功能

@SpringBootApplication@EnableEurekaClient //开启 Eureka 客户端功能@EnableCircuitBreaker //激活熔断器功能<---------public class MicroServiceCloudProviderDeptHystrix8004Application { public static void main(String[] args) { SpringApplication.run(MicroServiceCloudProviderDeptHystrix8004Application.class, args); }}

降级--------

1.配置

feign: hystrix: enabled: true #开启客户端 hystrix

2.降级

@Component@FeignClient(value = "MICROSERVICECLOUDPROVIDERDEPTHYSTRIX", fallback = DeptHystrixFallBackService.class)public interface DeptHystrixService { @RequestMapping(value = "/dept/hystrix/ok/{id}") public String deptInfo_Ok(@PathVariable("id") Integer id); @RequestMapping(value = "/dept/hystrix/timeout/{id}") public String deptInfo_Timeout(@PathVariable("id") Integer id);}

Dashboard流监控

1，依赖

org.springframework.cloud spring-cloud-starter-hystrix-dashboard

2.开启注解
@EnablehystrixDashboard

3.增加一个Servlet

@Bean public ServletRegistrationBean getServlet() { HystrixMetricsStreamServlet streamServlet = new HystrixMetricsStreamServlet(); ServletRegistrationBean registrationBean = new ServletRegistrationBean(streamServlet); registrationBean.setLoadOnStartup(1); registrationBean.addUrlMappings("/actuator/hystrix.stream");//访问路径 registrationBean.setName("hystrix.stream"); return registrationBean; }

监控依赖

spring-cloud-start-actuator