聊聊NacosDiscoveryHealthIndicatorAutoConfiguration
- 2019 年 10 月 7 日
- 筆記
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
