Spring Cloud 的 Hystrix 通過Fallback Factory 檢查回退的錯誤原因

一、Feign指向

         注意採用的是fallbackFactory指向

package com.itmuch.cloud;

import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@FeignClient(name="cloud-service", fallbackFactory = FeignClientFallbackFactory.class)   // 服務端提供者的name
public interface UserFeignClient {

	@RequestMapping(value = "/get/{id}", method = RequestMethod.GET)
	public User findById(@PathVariable("id") Long id); 

}

二、創建一個Feign接口實現類

package com.itmuch.cloud;

import org.springframework.stereotype.Component;

import feign.hystrix.FallbackFactory;

@Component
public class FeignClientFallbackFactory implements FallbackFactory<UserFeignClient> {

	@Override
	public UserFeignClient create(Throwable cause) {
		return new UserFeignClient() {

			@Override
			public User findById(Long id) {
				System.out.println("fallback; reason was:" + cause);
				User user = new User();
				user.setId(-1L);
				user.setName("NULL");
				return user;
			}
			
		};
	}


}