聊聊NacosDiscoveryHealthIndicatorAutoConfiguration

序

本文主要研究一下NacosDiscoveryHealthIndicatorAutoConfiguration

NacosDiscoveryHealthIndicatorAutoConfiguration

nacos-spring-boot-project/nacos-discovery-spring-boot-actuator/src/main/java/com/alibaba/boot/nacos/discovery/actuate/autoconfigure/NacosDiscoveryHealthIndicatorAutoConfiguration.java

@Configuration
@ConditionalOnClass({ HealthIndicator.class })
@AutoConfigureBefore({ EndpointAutoConfiguration.class })
@AutoConfigureAfter(NacosDiscoveryAutoConfiguration.class)
@ConditionalOnEnabledHealthIndicator(NacosDiscoveryConstants.ENDPOINT_PREFIX)
public class NacosDiscoveryHealthIndicatorAutoConfiguration {

	@Bean
	@ConditionalOnMissingBean
	public NacosDiscoveryHealthIndicator nacosDiscoveryHealthIndicator() {
		return new NacosDiscoveryHealthIndicator();
	}

}

• NacosDiscoveryHealthIndicatorAutoConfiguration注册了NacosDiscoveryHealthIndicator

NacosDiscoveryHealthIndicator

nacos-spring-boot-project/nacos-discovery-spring-boot-actuator/src/main/java/com/alibaba/boot/nacos/discovery/actuate/health/NacosDiscoveryHealthIndicator.java

public class NacosDiscoveryHealthIndicator extends AbstractHealthIndicator {

	@Autowired
	private ApplicationContext applicationContext;

	private static final String UP_STATUS = "up";

	@Override
	protected void doHealthCheck(Health.Builder builder) throws Exception {
		builder.up();
		NacosServiceFactory nacosServiceFactory = CacheableEventPublishingNacosServiceFactory.getSingleton();
		for (NamingService namingService : nacosServiceFactory.getNamingServices()) {
			if (namingService instanceof NacosServiceMetaData) {
				NacosServiceMetaData nacosServiceMetaData = (NacosServiceMetaData) namingService;
				Properties properties = nacosServiceMetaData.getProperties();
				builder.withDetail(
						JSON.toJSONString(
								PropertiesUtils.extractSafeProperties(properties)),
						namingService.getServerStatus());
			}
			if (!namingService.getServerStatus().equalsIgnoreCase(UP_STATUS)) {
				builder.down();
			}
		}
	}
}

• NacosDiscoveryHealthIndicator继承了AbstractHealthIndicator，其doHealthCheck方法会遍历namingService，如果namingService为NacosServiceMetaData则将properties的json作为key，serverStatus作为value填充到detail中；接着判断其serverStatus是否为up，不是的话则标记为down

小结

NacosDiscoveryHealthIndicatorAutoConfiguration注册了NacosDiscoveryHealthIndicator；NacosDiscoveryHealthIndicator继承了AbstractHealthIndicator，其doHealthCheck方法会遍历namingService，如果namingService为NacosServiceMetaData则将properties的json作为key，serverStatus作为value填充到detail中；接着判断其serverStatus是否为up，不是的话则标记为down

doc

• NacosDiscoveryHealthIndicatorAutoConfiguration

来源：https://my.oschina.net/go4it/blog/3111013