Spring Cloud OpeFeign原理

.......

OpenFeign Framework

NamedContextFactory

getObject()

FeignInvocationHandler

$goodsServiceProxy

FeignClientFactoryBeanname:feign-client-name2

Contract协议解析规则

OpenFeign

 @AutowiredIGoodsServiceFeignClient goodsService;

远程调用

MethodHandler

value: AnnotationConfigApplicationContext

OrderController

GoodsController

invoke

Feign.Builder

请求转发

Decoder

$Proxy2

RequestTemplate

IGoodsService gs; gs.getGoodsById();

   @GetMapping    public String order(){      goodsServiceFeignClient.getGoodsById();    }

interface#method

返回结果

gpmall-portal

Contract

Proxy.newInstance

@FeignClient(name=\"feign-client-name2\")public interface IFeignName2{}

引入OpenFeign之前的通信方式

$Proxy3

http通信

OpenFeign的整体工作原理图解

OpenFeign模版解析以及方法请求分发逻辑

Spring Cloud OpenFeign 父子容器隔离

FeignLoggerFactory

IGoodsService

dependency

Encoder

@Autowiredprivate IFeignName1 feignName1

@FeignClientpublic interface IGoodServiceFeignClient{    @RequestMapping     String getGoodsById();}

@Slf4j@RestControllerpublic class GoodsServices implements IGoodsService {    public String getGoodsById(){        log.info(\"receive request\");        return \"返回商品详细信息\";    }}

Spring ApplicationContext

返回

方法调用的元数据信息

client.execute

......

FeignClientFactoryBeanname:feign-client-name1

Feign接口注入

Nexus Repository

buildTemplateFromArgs.create()

FeignContext

全局对象

goods-service

key:  feign-client-name2

解析

RestTemplate

解析模版

List<MethodMetadata>

deploy

注入Dynamic Proxy instance

@FeignClient(name=\"feign-client-name1\")public interface IFeignName1{}

引入OpenFeign之后的通信方式

OpenFeign接口定义

GoodsServiceImpl

Goods-Service

OKhttp

扫描@EnableFeignClient路径下的@FeignClient

goods-service-api

key:  feign-client-name1

FeignClient接口

Spring IOC容器

当客户端调用动态代理的方法时，会被FeignInvocationHandler转发到方法对应的MethodHandler处理

保存到Map集合

Reqeust

targetRequest转化为真正的请求

Dispatch

保存