春雲hystrix fallbackfactory

Question

當我用hystrix研究Spring cloud偽裝時，遇到一個問題，如果我使用LOGGER.info（“ **** {}”，cause.getMessage（）），后備功能將不起作用，UserFeignClient＃findById（Long）會計時退出和后備失敗。 但是，如果我刪除cause.getMessage（），回退就可以了。 為什么？

public class UserFeignFallBackFactory implements FallbackFactory<UserFeignClient> {

    private static final Logger LOGGER = LoggerFactory.getLogger(UserFeignFallBackFactory.class);

    @Override
    public UserFeignClient create(Throwable cause) {
        LOGGER.info("call UserFeignClient error, error msg is : {}");
        return new UserFeignClientEx() {
            @Override
            public User findById(@PathVariable("id") Long id) {
                return new User(-1L, null, null, (short) 20);
            }
        };
    }
}

在此處輸入圖片說明

Answer 1

你可以這樣嘗試

public class UserFeignFallBackFactory implements FallbackFactory<UserFeignClient> {

private static final Logger LOGGER = LoggerFactory.getLogger(UserFeignFallBackFactory.class);

@Override
public UserFeignClient create(Throwable cause) {

    return new UserFeignClientEx() {
        @Override
        public User findById(@PathVariable("id") Long id) {
            LOGGER.info("call UserFeignClient error, error msg is : {}");
            return new User(-1L, null, null, (short) 20);
        }
    };
}
}