Ribbon服务请求调用流程

spring.factories

InterceptingRequestExecution#execute

注入LoadBalancerClient

spring-cloud-commons.jar

AbstractBufferingClientHttpRequest#executeInternal()

DynamicServerListLoadBalancer

getLoadBalancer(serviceId)

负载均衡拦截器(注入LoadBalancerClient)

RibbonLoadBalancerClient#getServer()

AbstractClientHttpRequest#execute

RestTemplateCustomizer

EurekaServer

restOfInit()

EurekaClient#getInstancesByVipAddress()

DiscoveryEnabledNIWSServerList#obtainServersViaDiscovery

LoadBalancerInterceptor#intercept

LoadBalancerInterceptor

DynamicServerListLoadBalancer#updateListOfServers

LoadBalancerAutoConfiguration

RibbonClientConfiguration

RibbonLoadBalancerClient#execute()

给每个RestTemplate设置拦截器，这样每个@LoadBalanced注解的方法都会执行LoadBalancerInterceptor.interceptor()方法

其他Bean......

ZoneAwareLoadBalancer

HttpComponentsClientHttpRequest#executeInternal