ribbon

ServiceA

LoadBalancerRequest.apply()

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ZoneAwareLoadBalancer

mapServiceA 独立的spring容器 ApplicationContextServiceB 独立的spring容器 ApplicationContextServiceC 独立的spring容器 ApplicationContext

reconstructURI构造请求的url

依赖 LoadBalancerClientLoadBalancerRequestFactoryLoadBalancerRequest

updateAction开启一个scheduled，1s后定时每30s调用updateListOfServers

setPingInterval()setupPingTask()

SpringClientFactory

父类DynamicServerListLoadBalancer

AbstractServerPredicate类的chooseRoundRobinAfterFiltering方法默认的 round robin轮询算法eligible.get(nextIndex.getAndIncrement() % eligible.size())

restTemplate中添加LoadBalancerInterceptor拦截器，对请求进行拦截

RibbonLoadBalancerClient

LoadBalancerAutoConfiguration

LoadBalancerRequestFactorycreateRequest->LoadBalancerRequest

获取到ZoneAwareLoadBalancer

ServiceRequestWrapper.getUrl()服务名转服务实例ip端口

IPing.isAlive()

SmartInitializingSingleton

@LoadBalanced  注入一个RestTemplate 入口

RibbonClientConfiguration向容器注册一个ZoneAwareLoadBalancer

restOfInit()其余初始化，初始化serverList

BaseLoadBalancer中的initWithConfig()->

注册

restTemplate.getForObject

DomainExtractingServerList的getUpdatedListOfServers最终调用obtainServersViaDiscovery

LoadBalancerInterceptor

 super.setServersList(lsrv)将serverList加入到BaseLoadBalancer的allServers中

LoadBalancerInterceptor的intercept方发进行拦截

RestTemplateCustomizer

ServiceA 独立的spring容器 ApplicationContext

choose 选择服务实例

ZoneAwareLoadBalancerServiceA  ->192.168.22.1:8021192.168.22.3:8921

DiscoveryEnabledNIWSServerListEureka的客户端，从本地缓存获取服务列表

updateListOfServers更新服务列表

ClientHttpRequest.execute()发送合http请求