Talk about nacos NacosDiscoveryAutoConfiguration

sequence

In this paper, we study the nacos NacosDiscoveryAutoConfiguration

NacosDiscoveryAutoConfiguration

nacos-spring-boot-project/nacos-discovery-spring-boot-autoconfigure/src/main/java/com/alibaba/boot/nacos/discovery/autoc onfigure/NacosDiscoveryAutoConfiguration.java

@ConditionalOnProperty(name = NacosDiscoveryConstants.ENABLED, matchIfMissing = true)
@ConditionalOnMissingBean(name = DISCOVERY_GLOBAL_NACOS_PROPERTIES_BEAN_NAME)
@EnableNacosDiscovery
@EnableConfigurationProperties(value = NacosDiscoveryProperties.class)
@ConditionalOnClass(name = "org.springframework.boot.context.properties.bind.Binder")
public class NacosDiscoveryAutoConfiguration {

    @Bean
    public NacosDiscoveryAutoRegister discoveryAutoRegister() {
        returnnew NacosDiscoveryAutoRegister(); }}Copy the code

• NacosDiscoveryAutoConfiguration registered NacosDiscoveryAutoRegister

NacosDiscoveryAutoRegister

nacos-spring-boot-project/nacos-discovery-spring-boot-autoconfigure/src/main/java/com/alibaba/boot/nacos/discovery/autoc onfigure/NacosDiscoveryAutoRegister.java

@Component
public class NacosDiscoveryAutoRegister implements ApplicationListener<WebServerInitializedEvent> {

    private static final Logger logger = LoggerFactory.getLogger(NacosDiscoveryAutoRegister.class);

    @NacosInjected
    private NamingService namingService;

    @Autowired
    private NacosDiscoveryProperties discoveryProperties;

    @Value("${spring.application.name:spring.application.name}")
    private String applicationName;

    @Override
    public void onApplicationEvent(WebServerInitializedEvent event) {

        if(! discoveryProperties.isAutoRegister()) {return;
        }

        Register register = discoveryProperties.getRegister();

        if (StringUtils.isEmpty(register.getIp())) {
            register.setIp(NetUtils.localIP());
        }

        if (register.getPort() == 0) {
            register.setPort(event.getWebServer().getPort());
        }

        register.getMetadata().put("preserved.register.source"."SPRING_BOOT");

        register.setInstanceId("");
        String serviceName = StringUtils.isEmpty(register.getServiceName()) ? applicationName : register.getServiceName();

        try {
            namingService.registerInstance(serviceName, register.getGroupName(), register);
            logger.info("Finished auto register service : {}, ip : {}, port : {}", register.getServiceName(), register.getIp(), register.getPort()); } catch (NacosException e) { throw new AutoRegisterException(e); }}}Copy the code

• NacosDiscoveryAutoRegister ApplicationListener interface is achieved, When it is received WebServerInitializedEvent through namingService. RegisterInstance (serviceName, register getGroupName (), register) to register as an example, An AutoRegisterException is escaped if a NacosException occurs

NacosDiscoveryAutoDeregister

nacos-spring-boot-project/nacos-discovery-spring-boot-autoconfigure/src/main/java/com/alibaba/boot/nacos/discovery/autoc onfigure/NacosDiscoveryAutoDeregister.java

@Component public class NacosDiscoveryAutoDeregister implements ApplicationListener<ContextClosedEvent> { private static  final Logger logger = LoggerFactory.getLogger(NacosDiscoveryAutoRegister.class); @NacosInjected private NamingService namingService; private final NacosDiscoveryProperties discoveryProperties; private final WebServer webServer; @Value("${spring.application.name:spring.application.name}")
    private String applicationName;

    public NacosDiscoveryAutoDeregister(NacosDiscoveryProperties discoveryProperties, WebServer webServer) {
        this.discoveryProperties = discoveryProperties;
        this.webServer = webServer;
    }

    @Override
    public void onApplicationEvent(ContextClosedEvent event) {
        if(! discoveryProperties.isAutoRegister()) {return;
        }

        Register register = discoveryProperties.getRegister();

        if (StringUtils.isEmpty(register.getIp())) {
            register.setIp(NetUtils.localIP());
        }

        if (register.getPort() == 0) {
            register.setPort(webServer.getPort());
        }

        String serviceName = StringUtils.isEmpty(register.getServiceName()) ? applicationName : register.getServiceName();

        try {
            namingService.deregisterInstance(serviceName, register.getGroupName(), register);
            logger.info("Finished auto deregister service : {}, ip : {}, port : {}", register.getServiceName(), register.getIp(), register.getPort()); } catch (NacosException e) { throw new AutoDeregisterException(e); }}}Copy the code

• NacosDiscoveryAutoDeregister ApplicationListener interface is achieved, When it is received ContextClosedEvent through namingService. DeregisterInstance (serviceName, register getGroupName (), register), the cancellation of the instance An AutoDeregisterException will be escaped if a NacosException occurs

summary

• NacosDiscoveryAutoConfiguration registered NacosDiscoveryAutoRegister
• NacosDiscoveryAutoRegister ApplicationListener interface is achieved, When it is received WebServerInitializedEvent through namingService. RegisterInstance (serviceName, register getGroupName (), register) to register as an example, An AutoRegisterException is escaped if a NacosException occurs
• NacosDiscoveryAutoDeregister ApplicationListener interface is achieved, When it is received ContextClosedEvent through namingService. DeregisterInstance (serviceName, register getGroupName (), register), the cancellation of the instance An AutoDeregisterException will be escaped if a NacosException occurs

doc

• NacosDiscoveryAutoConfiguration