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This article mainly explains "how to use NacosDiscoveryClient". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to use NacosDiscoveryClient.

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This paper mainly studies NacosDiscoveryClient.

NacosDiscoveryClient

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

Public class NacosDiscoveryClient implements DiscoveryClient {private static final Logger log = LoggerFactory.getLogger (NacosDiscoveryClient.class); public static final String DESCRIPTION = "Spring Cloud NacosDiscoveryClient"; private NacosDiscoveryProperties discoveryProperties; public NacosDiscoveryClient (NacosDiscoveryProperties discoveryProperties) {this.discoveryProperties = discoveryProperties;} @ Override public String description () {return DESCRIPTION } @ Override public List getInstances (String serviceId) {try {List instances = discoveryProperties.namingServiceInstance () .selectInstances (serviceId, true); return hostToServiceInstanceList (instances, serviceId) } catch (Exception e) {throw new RuntimeException ("Can not get hosts from nacos server. ServiceId: "+ serviceId, e);}} private static ServiceInstance hostToServiceInstance (Instance instance, String serviceId) {NacosServiceInstance nacosServiceInstance = new NacosServiceInstance (); nacosServiceInstance.setHost (instance.getIp ()); nacosServiceInstance.setPort (instance.getPort ()); nacosServiceInstance.setServiceId (serviceId) Map metadata = new HashMap (); metadata.put ("nacos.instanceId", instance.getInstanceId ()); metadata.put ("nacos.weight", instance.getWeight () + "); metadata.put (" nacos.healthy ", instance.isHealthy () +"); metadata.put ("nacos.cluster", instance.getClusterName () + "") Metadata.putAll (instance.getMetadata ()); nacosServiceInstance.setMetadata (metadata); if (metadata.containsKey ("secure")) {boolean secure = Boolean.parseBoolean (metadata.get ("secure")); nacosServiceInstance.setSecure (secure);} return nacosServiceInstance } private static List hostToServiceInstanceList (List instances, String serviceId) {List result = new ArrayList (instances.size ()); for (Instance instance: instances) {result.add (hostToServiceInstance (instance, serviceId));} return result } @ Override public List getServices () {try {ListView services = discoveryProperties.namingServiceInstance () .getServicesOfServer (1, Integer.MAX_VALUE); return services.getData () } catch (Exception e) {log.error ("get service name from nacos server fail,", e); return Collections.emptyList ();}}

NacosDiscoveryClient implements the org.springframework.cloud.client.discovery.DiscoveryClient interface; its getInstances method obtains NamingService from discoveryProperties, then obtains instance information through NamingService.selectInstances, and then converts it to org.springframework.cloud.client.ServiceInstance type; getServices method obtains services information through NamingService.getServicesOfServer

NacosDiscoveryClientAutoConfiguration

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

Configuration@ConditionalOnNacosDiscoveryEnabled@AutoConfigureBefore ({SimpleDiscoveryClientAutoConfiguration.class, CommonsClientAutoConfiguration.class}) public class NacosDiscoveryClientAutoConfiguration {@ Bean @ ConditionalOnMissingBean public NacosDiscoveryProperties nacosProperties () {return new NacosDiscoveryProperties ();} @ Bean public DiscoveryClient nacosDiscoveryClient (NacosDiscoveryProperties discoveryProperties) {return new NacosDiscoveryClient (discoveryProperties) } @ Bean @ ConditionalOnMissingBean @ ConditionalOnProperty (value = "spring.cloud.nacos.discovery.watch.enabled", matchIfMissing = true) public NacosWatch nacosWatch (NacosDiscoveryProperties nacosDiscoveryProperties) {return new NacosWatch (nacosDiscoveryProperties);}}

NacosDiscoveryClientAutoConfiguration is registered with NacosDiscoveryClient

Summary

NacosDiscoveryClient implements the org.springframework.cloud.client.discovery.DiscoveryClient interface; its getInstances method obtains NamingService from discoveryProperties, then obtains instance information through NamingService.selectInstances, and then converts it to org.springframework.cloud.client.ServiceInstance type; getServices method obtains services information through NamingService.getServicesOfServer

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