eureka源码画图剖析

最新推荐文章于 2026-01-01 15:39:09 发布

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本文深入剖析Eureka服务端和客户端的启动流程，从源码层面理解其工作原理。首先，详细讲解了Eureka Server的启动过程，接着分析Eureka Client如何进行服务注册。

1、入口分析
web.xml

<listener>
  <listener-class>com.netflix.eureka.EurekaBootStrap</listener-class>
</listener>

2、流程分析
    2.1 EurekaBootStrap.initEurekaEnvironment
    2.2 EurekaBootStrap.initEurekaServerContext
        2.2.1 DefaultEurekaServerConfig
        2.2.2 DefaultServerCodecs
        2.2.3 new DiscoveryClient 进入客户端流程
            2.2.3.1 ApplicationInfoManager.getInfo
            2.2.3.2 EurekaClientConfig.getTransportConfig
            2.2.3.3 DiscoveryClient.scheduleServerEndpointTask
                2.2.3.3.1 EurekaHttpClients.registrationClientFactory
                2.2.3.3.2 EurekaHttpClientFactory.newClient -> SessionedEurekaHttpClient
            2.2.3.4 DiscoveryClient.fetchRegistry
            2.2.3.5 DiscoveryClient.getAndStoreFullRegistry
            2.2.3.6 DiscoveryClient.initScheduledTasks
                2.2.3.6.1 new CacheRefreshThread().refreshRegistry
                2.2.3.6.2 new HeartbeatThread().renew
                2.2.3.6.3 InstanceInfoReplicator.start().scheduler.schedule 延时注册
        2.2.4 new PeerAwareInstanceRegistryImpl
        2.2.5 getPeerEurekaNodes
        2.2.6 EurekaServerContext.initialize
            2.2.6.1 PeerEurekaNodes.start
            2.2.6.2 PeerAwareInstanceRegistry.init
        2.2.7 PeerAwareInstanceRegistryImpl.syncUp
        2.2.8 PeerAwareInstanceRegistryImpl.openForTraffic

1、eurekaServer启动

web.xml

<listener>
  <listener-class>com.netflix.eureka.EurekaBootStrap</listener-class>
</listener>

@Override
public void contextInitialized(ServletContextEvent event) {
	try {
	    initEurekaEnvironment();
	    initEurekaServerContext();

	    ServletContext sc = event.getServletContext();
	    sc.setAttribute(EurekaServerContext.class.getName(), serverContext);
	} catch (Throwable e) {
	    logger.error("Cannot bootstrap eureka server :", e);
	    throw new RuntimeException("Cannot bootstrap eureka server :", e);
	}
}


标准的web项目，listener带动整个项目的启动

2、eureka client启动

private static synchronized EurekaClient initializeEurekaClient(ApplicationInfoManager applicationInfoManager, EurekaClientConfig clientConfig) {
	if (eurekaClient == null) {
	 	eurekaClient = new DiscoveryClient(applicationInfoManager, clientConfig);
	}

	return eurekaClient;
}