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Today, I would like to talk to you about how to understand NacosRibbonClientConfiguration. Many people may not know much about it. In order to make you understand better, the editor has summarized the following contents for you. I hope you can get something from this article.

Order

This paper mainly studies NacosRibbonClientConfiguration.

NacosRibbonClientConfiguration

Spring-cloud-alibaba-0.9.0.RELEASE/spring-cloud-alibaba-nacos-discovery/src/main/java/org/springframework/cloud/alibaba/nacos/ribbon/NacosRibbonClientConfiguration.java

@ Configuration@ConditionalOnRibbonNacospublic class NacosRibbonClientConfiguration {@ Bean @ ConditionalOnMissingBean public ServerList ribbonServerList (IClientConfig config, NacosDiscoveryProperties nacosDiscoveryProperties) {NacosServerList serverList = new NacosServerList (nacosDiscoveryProperties); serverList.initWithNiwsConfig (config); return serverList;}}

NacosRibbonClientConfiguration creates a NacosServerList

NacosServerList

Spring-cloud-alibaba-0.9.0.RELEASE/spring-cloud-alibaba-nacos-discovery/src/main/java/org/springframework/cloud/alibaba/nacos/ribbon/NacosServerList.java

Public class NacosServerList extends AbstractServerList {private NacosDiscoveryProperties discoveryProperties; private String serviceId; public NacosServerList (NacosDiscoveryProperties discoveryProperties) {this.discoveryProperties = discoveryProperties;} @ Override public List getInitialListOfServers () {return getServers (); @ Override public List getUpdatedListOfServers () {return getServers () } private List getServers () {try {List instances = discoveryProperties.namingServiceInstance () .selectInstances (serviceId, true); return instancesToServerList (instances) } catch (Exception e) {throw new IllegalStateException ("Can not get service instances from nacos, serviceId=" + serviceId, e) }} private List instancesToServerList (List instances) {List result = new ArrayList (); if (null = = instances) {return result;} for (Instance instance: instances) {result.add (new NacosServer (instance)) Return result;} public String getServiceId () {return serviceId;} @ Override public void initWithNiwsConfig (IClientConfig iClientConfig) {this.serviceId = iClientConfig.getClientName ();}}

NacosServerList inherits com.netflix.loadbalancer.AbstractServerList. Both its getInitialListOfServers and getUpdatedListOfServers methods call the getServers;getServers method, and the service instance information is obtained through NamingService.selectInstances.

NacosServer

Spring-cloud-alibaba-0.9.0.RELEASE/spring-cloud-alibaba-nacos-discovery/src/main/java/org/springframework/cloud/alibaba/nacos/ribbon/NacosServer.java

Public class NacosServer extends Server {private final MetaInfo metaInfo; private final Instance instance; private final Map metadata; public NacosServer (final Instance instance) {super (instance.getIp (), instance.getPort ()); this.instance = instance This.metaInfo = new MetaInfo () {@ Override public String getAppName () {return instance.getServiceName () } @ Override public String getServerGroup () {return null;} @ Override public String getServiceIdForDiscovery () {return null } @ Override public String getInstanceId () {return instance.getInstanceId ();}}; this.metadata = instance.getMetadata () } @ Override public MetaInfo getMetaInfo () {return metaInfo;} public Instance getInstance () {return instance;} public Map getMetadata () {return metadata;}}

NacosServer inherits com.netflix.loadbalancer.Server;. It mainly has three attributes: metaInfo, instance and metadata.

Summary

NacosRibbonClientConfiguration will create NacosServerList;NacosServerList and inherit com.netflix.loadbalancer.AbstractServerList. Both its getInitialListOfServers and getUpdatedListOfServers methods call the getServers;getServers method and obtain the service instance information through NamingService.selectInstances.

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