ribbon，feign选择和与Hystrix的整合应用

@SpringBootApplication(scanBasePackages = "com.vanpeng.cms")
@ComponentScan("com.vanpeng.cms.*")
@EnableCaching
@EnableEurekaClient
@EnableSwagger2
@EnableFeignClients  #开启feign
@EnableCircuitBreaker  #开启hystrix  
//@EnableApolloConfig
public class CmsApplication {
    public static void main(String[] args) {
        SpringApplication.run(CmsApplication.class, args);
    }
    @Bean
    @LoadBalanced
    RestTemplate restTemplate() {
        return new RestTemplate();
    }
}

feign:
  hystrix:
    enabled: true  #hystrix默认关闭需要 开启
ribbon:
  ConnectTimeout: 5000 # 请求连接的超时时间 默认的时间为 1 秒
  ReadTimeout: 5000 # 请求处理的超时时间
hystrix:
  command:
    default:  #default全局有效，service id指定应用有效
      execution:
        timeout:
          #如果enabled设置为false，则请求超时交给ribbon控制,为true,则超时作为熔断根据
          enabled: true
        isolation:
          strategy: SEMAPHORE
          thread:
            timeoutInMilliseconds: 5000 #断路器超时时间，默认1000ms
      circuitBreaker:
        enabled: true
        requestVolumeThreshold: 10 #默认20 ，熔断的阈值，如何user服务报错满足3次，熔断器就会打开，就算order之后请求正确的数据也不行。
        sleepWindowInMilliseconds: 8000 #默认5S ， 等5S之后熔断器会处于半开状态，然后下一次请求的正确和错误讲决定熔断器是否真的关闭和是否继续打开
        errorThresholdPercentage: 0.5

@FeignClient(name = "data-service", fallback = DataFallBack.class) //表明是feign接口 name为被调用服务在erueka上的服务名
public interface DataServiceFeign {
    @PostMapping("/selectDataSetId") //对应着被调用服务的路径   post表明为post请求 请求参数为@RequestBody ResultCatalog resultCatalog
    Result<Object> selectByDataSetId(@RequestBody ResultCatalog resultCatalog);
    @GetMapping("/resourceMenu/selectFeignService/{lecturerUserNo}") //表明为get请求 参数为 @PathVariable(value = "lecturerUserNo") Long lecturerUserNo
    Result<List<ResultCatalog>>
        selectService(@PathVariable(value = "lecturerUserNo") Long lecturerUserNo);
}

@Component
public class DataFallBack implements DataServiceFeign {  //需要实现feign接口 每个方法对应着每个feign调用的服务 
    @Override
    public Result<Object> selectByDataSetId(ResultCatalog resultCatalog) {
        Result<Object> result = new Result<Object>();
        String error = "调用系统失败。";
        result.setCode(506);
        result.setMessage(error);
        return result;
    }
    @Override
    public Result<List<ResultCatalog>>
        selectServicel(Long lecturerUserNo) {
        Result<List<ResultCatalog>> result = new Result<>();
        String error = "调用系统失败。";
        result.setCode(506);
        result.setMessage(error);
        return result;
    }
}

public class DataServiceController {
    @Autowired
    DataServiceFeign dataServiceFeign;
    @Autowired
    SystemPortalFeign systemPortalFeign;
    /**
     * ajax数据服务
     * 
     * @param resultMapResourceCatalog
     * @return
     */
    @PostMapping("/DataService")
    public Result
        DataService(@RequestBody ResultCatalog resultCatalog) {
        Result<Object> resultObj = dataServiceFeign.selectByDataSetId(resultCatalog);
    }
}