【Java】Hystrix服务保护框架 服务降级Fallback

• Z时代
• 2024-01-10
• 分类：技术分享

//Hystrix 第二种方式，使用类方式
@RequestMapping("/getUserInfoByMemberHystrix2")
public BaseResponse getUserInfoByMemberHystrix2() {
System.out.println("getUserInfoByMemberHystrix-->线程池名称：" + Thread.currentThread().getName());
return memberServiceFeign.getUserInfo();
}

package com.baba.api.fallback;
import com.baba.api.entity.UserEntity;
import com.baba.api.feign.MemberServiceFeign;
import com.baba.wlb.base.BaseApiService;
import com.baba.wlb.base.BaseResponse;
import org.springframework.stereotype.Component;
/**
* @Author wulongbo
* @Date 2021/1/28 10:13
* @Version 1.0
*/@Component
public class MemberServiceFallback extends BaseApiService implements MemberServiceFeign {
@Override
public UserEntity getMember(String name) {
return null;
}
// 服务降级友好提示
@Override
public BaseResponse getUserInfo() {
return setResultError("以类的方式写服务降级，服务器繁忙，请稍后重试！");
}
}

package com.baba.api.feign;
import com.baba.api.fallback.MemberServiceFallback;
import com.baba.api.service.IMemberService;
import org.springframework.cloud.openfeign.FeignClient;
/**
* @Author wulongbo
* @Date 2021/1/22 14:12
* @Version 1.0
*///@FeignClient(name = "app-member")
@FeignClient(value = "app-member",fallback = MemberServiceFallback.class)
public interface MemberServiceFeign extends IMemberService{
}

前言

前面我们使用 @HystrixCommand 注解来做服务熔断降级。这种方式存在很大的弊端，代码冗余，并且是不管是否降级都事先开启了新线程，而使用fallback的方式则不调用feign方法前都是在之前的主线程中，只有超时了，才会开新线程来处理，这样性能上更好。

代码改造

Hystrix 使用类方式

//Hystrix 第二种方式，使用类方式
@RequestMapping("/getUserInfoByMemberHystrix2")
public BaseResponse getUserInfoByMemberHystrix2() {
System.out.println("getUserInfoByMemberHystrix-->线程池名称：" + Thread.currentThread().getName());
return memberServiceFeign.getUserInfo();
}

MemberServiceFallback

package com.baba.api.fallback;
import com.baba.api.entity.UserEntity;
import com.baba.api.feign.MemberServiceFeign;
import com.baba.wlb.base.BaseApiService;
import com.baba.wlb.base.BaseResponse;
import org.springframework.stereotype.Component;
/**
* @Author wulongbo
* @Date 2021/1/28 10:13
* @Version 1.0
*/@Component
public class MemberServiceFallback extends BaseApiService implements MemberServiceFeign {
@Override
public UserEntity getMember(String name) {
return null;
}
// 服务降级友好提示
@Override
public BaseResponse getUserInfo() {
return setResultError("以类的方式写服务降级，服务器繁忙，请稍后重试！");
}
}

MemberServiceFeign

@FeignClient(name = "app-member") 改为 @FeignClient(value = "app-member",fallback = MemberServiceFallback.class)

package com.baba.api.feign;
import com.baba.api.fallback.MemberServiceFallback;
import com.baba.api.service.IMemberService;
import org.springframework.cloud.openfeign.FeignClient;
/**
* @Author wulongbo
* @Date 2021/1/22 14:12
* @Version 1.0
*///@FeignClient(name = "app-member")
@FeignClient(value = "app-member",fallback = MemberServiceFallback.class)
public interface MemberServiceFeign extends IMemberService{
}

这样就实现了类的方式调用Fallback。

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