[Java知识库]SpringCloud-Feign开启Hystrix

一、配置文件开启Hystrix

通过feign.hystrix.enabled=true开启Hystrix

feign:
  hystrix:
    enabled: true #开启熔断支持
ribbon:
  ReadTimeout: 3000
  SocketTimeout: 3000
  ConnectTimeout: 3000
hystrix:
  command:
    default:
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 10300

二、Fiegn接口熔断

一.fallback方式

@FeignClient(value = "user-server",fallback = UserFeignClientFallback.class)
public interface UserFeignClient {

    //订单服务来调用这个方法      http://localhost:1020/user/10
    // @GetMapping(value = "/user/{id}" )
    @RequestMapping(value = "/user/{id}",method = RequestMethod.GET)
    User getById(@PathVariable("id")Long id);
}

//让Spring扫描到该托底类
@Component
public class UserFeignClientFallback implements UserFeignClient {

    //日志打印器
    private Logger log = LoggerFactory.getLogger(UserFeignClientFallback.class);

    @Override
    public User getById(Long id) {
        log.info("用户服务不可用");
        //托底数据
        return new User(-1l,"无此用户","用户服务不可用");
    }
}

二.fallbackFactory方式

//@FeignClient(value = "user-server",fallback = UserFeignClientFallback.class)
@FeignClient(value = "user-server",fallbackFactory = UserFeignClientFallbackFactory.class)
public interface UserFeignClient {

    //订单服务来调用这个方法      http://localhost:1020/user/10
    // @GetMapping(value = "/user/{id}" )
    @RequestMapping(value = "/user/{id}",method = RequestMethod.GET)
    User getById(@PathVariable("id")Long id);
}

//工厂方式的 ， 托底类
@Component
public class UserFeignClientFallbackFactory implements FallbackFactory<UserFeignClient>{

    //拖地方法 ： throwable，异常
    @Override
    public UserFeignClient create(Throwable throwable) {
		//返回UserFeignClient 接口的实例
        return new UserFeignClient() {
            @Override
            public User getById(Long id) {
                //把异常信息打印到控制台
                throwable.printStackTrace();

                //真正拖地方法 ， 这里的数据是托底数据
                return new User(-1L,"无此用户","用户服务不可用");
            }
        };
    }
}