package com.xing.config;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.context.annotation.Scope;

import feign.Contract;

import feign.Feign;

@Configuration

public class FeignConfig {

    //配置是在FeignClient中的接口中使用Feign自带的注解

    @Bean

    public Contract feignContract(){

        return new feign.Contract.Default();

   }

    //禁用Hystrix

    @Bean

    @Scope("prototype")

    public Feign.Builder feignBuilder() {

        return Feign.builder();

    } 

}
        

package com.xing.movie.FeignInteface;

import org.springframework.cloud.netflix.feign.FeignClient;

import org.springframework.stereotype.Component;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import com.xing.config.FeignConfig;

import com.xing.movie.entity.User;

import feign.Param;

import feign.RequestLine;

import feign.hystrix.FallbackFactory;

//@FeignClient中的fallback和fallbackFactory不能一起使用

@FeignClient(name = "xing-user" ,/*fallback = UserInterfaceFallback.class,*/configuration = FeignConfig.class , fallbackFactory = HystrixClientFallbackFactory.class)//服务名

public interface UserInterface {

    //@RequestMapping(value ="/user/findByNameEn/{nameEn}" ,method =RequestMethod.GET ) //必须使用RequestMapper,使用GetMapping启动报错

    @RequestLine("GET /user/findByNameEn/{nameEn}") //当配置了feignContract之后要使用这个Feign的注解，使用上面的报错,如果配置了这个，那下面方法里面必须使用@Param不能使用@PathVariable

    public User findByNameEn(@Param("nameEn") String nameEn);//@Param后面需要指定nameEn，不然可能报错

}

//不一定要内部类可以是外部类

//Hystrix异常处理类 ，返回空的user

@Component

class UserInterfaceFallback implements UserInterface {

    @Override

    public User findByNameEn(String nameEn) {

        User user = new User();

        user.setName("");

        user.setNameEn("");

        user.setId(0);

        return user;

    }

}

//Hystrix 访问异常时可以显示错误信息

@Component

class HystrixClientFallbackFactory implements FallbackFactory<UserInterface> {

    @Override

    public UserInterface create(Throwable cause) {

        return new UserInterface() {

            @Override

            public User findByNameEn(String nameEn) {

                return new User("fallback;reason was : "+cause.getMessage(), " ", 0);

            }

        };

    }

}