如何理解NacosRibbonClientConfiguration

今天就跟大家聊聊有关如何理解NacosRibbonClientConfiguration，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。

序

本文主要研究一下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会创建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继承了com.netflix.loadbalancer.AbstractServerList，其getInitialListOfServers及getUpdatedListOfServers方法都是调用了getServers；getServers方法则是通过NamingService.selectInstances来获取服务实例信息

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继承了com.netflix.loadbalancer.Server；它主要有metaInfo、instance、metadata三个属性

小结

NacosRibbonClientConfiguration会创建NacosServerList；NacosServerList继承了com.netflix.loadbalancer.AbstractServerList，其getInitialListOfServers及getUpdatedListOfServers方法都是调用了getServers；getServers方法则是通过NamingService.selectInstances来获取服务实例信息

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