Sentinel-結合Feign(五)

分為以下4步:

1. 添加依賴: sentinel，feign
2. 配置feign允許sentinel
3. 編寫: feign，請求客戶端
4. 為客戶端添加(sentinel)異常處理類

1.添加依賴: sentinel，feign

<dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
</dependency>

2.配置feign允許sentinel

feign:
  sentinel:
    enabled: true

3.編寫: feign，請求客戶端

@FeignClient(name = "user-center")
public interface UserCenterFeignClient {
    public ApiResult findBy(Integer id);
    public ApiResult getDetail(User user);
}

4.為客戶端添加(sentinel)異常處理類

方式(1).

// 用戶中心 Feign 接口
@FeignClient(name = "user-center",fallback = FeignClientFallback.class)
public interface UserCenterFeignClient {
    public ApiResult findBy(Integer id);
    public ApiResult getDetail(User user);
}

// 用戶中心 Feign異常接收處理類
@Component
public class UserCenterFeignClientFallback implements UserCenterFeignClient {
    @Override
    public ApiResult findBy(Integer id) {
        return ApiResult.error("異常");
    }

    @Override
    public ApiResult getDetail(User users) {
        return ApiResult.error("異常");
    }
}

方式(2).

// 接口
@FeignClient(name = "user-center",fallbackFactory = FeignClientFallback.class)        // 方法上可以拿到異常
public interface UserCenterFeignClient {
    public ApiResult findBy(Integer id);
    public ApiResult getDetail(User user);
}

// 異常處理類
@Component
@Slf4j
public class UserCenterFeignClientFallbackFactory implements FallbackFactory<UserCenterFeignClient> {

    // 用戶中心 Feign異常接收處理類
    @Override
    public UserCenterFeignClient create(Throwable throwable) {
        return new UserCenterFeignClient() {
            @Override
            public ApiResult findBy(Integer id) {
                log.warn("異常",throwable);
                return ApiResult.error("Sentinel 異常");
            }

            @Override
            public ApiResult getDetail(User users) {
                return ApiResult.error("Sentinel 異常");
            }
        };
    }

}