Feign Hystrix 支持

小灰灰 2022-06-15 03:23 207阅读 0赞

如果Hystrix在类路径上，feign.hystrix.enable=true，Feign将用断路器包装所有方法。

Hystrix支持回退的概念：当电路断开或出现错误时执行的默认代码路径。要为给定的@FeignClient启用回退，请将fallback属性设置为实现回退的类名。

示例代码：

![这里写图片描述][SouthEast]

UserFeignClientHystrix 需要实现UserFeignClient

UserFeignClient.java

@FeignClient(name = "springcloud-userservcie", fallback = UserFeignClientHystrix.class)
    public interface UserFeignClient {
    
        @RequestMapping(value = "userService/getUser/{userId}", method = RequestMethod.GET)
        public User getUser(@PathVariable("userId") String userId);
    
        @RequestMapping(value = "userService/saveUser", method = RequestMethod.POST)
        public String saveUser(User user);
    
        @RequestMapping(value = "userService/deleteUser/{userId}", method = RequestMethod.GET)
        public Boolean deleteUser(@PathVariable("userId") String userId);
    
        @RequestMapping(value = "userService/findUserByUserNameAndPassword", method = RequestMethod.GET)
        public User findUserByUserNameAndPassword(@RequestParam("userName") String userName, @RequestParam("password") String password);
    
    }

![这里写图片描述][SouthEast 1]

UserFeignClientHystrix.java

@Component
    public class UserFeignClientHystrix implements UserFeignClient { 
    
        @Override
        public User getUser(String userId) {
            System.out.println("打开了断路器--->" + userId);
            return null;
        }
    
        @Override
        public String saveUser(User user) {
            return null;
        }
    
        @Override
        public Boolean deleteUser(String userId) {
            return null;
        }
    
        @Override
        public User findUserByUserNameAndPassword(String userName, String password) {
            return null;
        }
    
    }

![这里写图片描述][SouthEast 2]

[SouthEast]: /images/20220615/379569b96d074418b79bb1863e435480.png
[SouthEast 1]: /images/20220615/567f6c175bb4414da7f366acae6159d0.png
[SouthEast 2]: /images/20220615/7d3433bd09984a98995ffc8cbf9c86c0.png