【微服务｜openfeign】feign的两种降级方式｜Fallback｜FallbackFactory

上文我们对@FeignClient做了详细的介绍，接下来，我们来一起feign的两种降级方式。

fallbackFactory 推荐：可以捕获异常信息并返回默认降级结果。可以打印堆栈信息。

Fallback

容错类

import com.ossa.feign.api.producer.ProducerFeign;
import feign.hystrix.FallbackFactory;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

/** * @author issavior */
@Slf4j
@Service
public class ProducerFeignFallback implements ProducerFeign {
    

    @Override
    public String producerById(String id) {
    
        String msg = "fallback限流方法";
        return id + msg;
    }
}

FeignClient

import com.ossa.feign.config.FeignClientConfig;
import com.ossa.feign.fallback.ProducerFeignFallback;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;



/** * @author issavior */
@FeignClient(value = "ossa-service-producer", configuration = FeignClientConfig.class,fallback = ProducerFeignFallback.class)
public interface ProducerFeign {
    

    /** * 根据ID查询商品 * * @param id 商品的主键ID * @return 相关商品的信息 */
    @GetMapping(value = "/producer/{id}")
    String producerById(@PathVariable("id") String id);

}

FallbackFactory

容错类

import com.ossa.feign.api.producer.ProducerFeign;
import feign.hystrix.FallbackFactory;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

/** * @author issavior */
@Slf4j
@Service
public class ProducerFeignFallback implements FallbackFactory<ProducerFeign> {
    

    @Override
    public ProducerFeign create(Throwable throwable) {
    
        return id -> {
    
            log.info("错误是：{}", throwable.getMessage());
            String msg = "fallback限流方法";
            return id + msg;
        };
    }
}

FeignClient

import com.ossa.feign.config.FeignClientConfig;
import com.ossa.feign.fallback.ProducerFeignFallback;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;



/** * @author issavior */
@FeignClient(value = "ossa-service-producer", configuration = FeignClientConfig.class,fallbackFactory = ProducerFeignFallback.class)
public interface ProducerFeign {
    

    /** * 根据ID查询商品 * * @param id 商品的主键ID * @return 相关商品的信息 */
    @GetMapping(value = "/producer/{id}")
    String producerById(@PathVariable("id") String id);

}