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AbstractDubboMetadata

dubbo-spring-boot-project-2.7.3/dubbo-spring-boot-compatible/actuator/src/main/java/org/apache/dubbo/spring/boot/actuate/endpoint/metadata/AbstractDubboMetadata.java

public abstract class AbstractDubboMetadata implements ApplicationContextAware, EnvironmentAware {

    protected ApplicationContext applicationContext;

    protected ConfigurableEnvironment environment;

    private static boolean isSimpleType(Class type) {
        return isPrimitiveOrWrapper(type)
                || type == String.class
                || type == BigDecimal.class
                || type == BigInteger.class
                || type == Date.class
                || type == URL.class
                || type == Class.class
                ;
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    @Override
    public void setEnvironment(Environment environment) {
        if (environment instanceof ConfigurableEnvironment) {
            this.environment = (ConfigurableEnvironment) environment;
        }
    }

    protected Map resolveBeanMetadata(final Object bean) {

        final Map beanMetadata = new LinkedHashMap<>();

        try {

            BeanInfo beanInfo = Introspector.getBeanInfo(bean.getClass());
            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();

            for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {

                Method readMethod = propertyDescriptor.getReadMethod();

                if (readMethod != null && isSimpleType(propertyDescriptor.getPropertyType())) {

                    String name = Introspector.decapitalize(propertyDescriptor.getName());
                    Object value = readMethod.invoke(bean);

                    beanMetadata.put(name, value);
                }

            }

        } catch (Exception e) {
            throw new RuntimeException(e);
        }

        return beanMetadata;

    }

    protected Map getServiceBeansMap() {
        return beansOfTypeIncludingAncestors(applicationContext, ServiceBean.class);
    }

    protected ReferenceAnnotationBeanPostProcessor getReferenceAnnotationBeanPostProcessor() {
        return applicationContext.getBean(BEAN_NAME, ReferenceAnnotationBeanPostProcessor.class);
    }

    protected Map getProtocolConfigsBeanMap() {
        return beansOfTypeIncludingAncestors(applicationContext, ProtocolConfig.class);
    }


}

• AbstractDubboMetadata声明实现了ApplicationContextAware及EnvironmentAware接口；提供了getServiceBeansMap、getReferenceAnnotationBeanPostProcessor、getProtocolConfigsBeanMap实现类使用

DubboShutdownMetadata

dubbo-spring-boot-project-2.7.3/dubbo-spring-boot-compatible/actuator/src/main/java/org/apache/dubbo/spring/boot/actuate/endpoint/metadata/DubboShutdownMetadata.java

@Component
public class DubboShutdownMetadata extends AbstractDubboMetadata {


    public Map shutdown() throws Exception {

        Map shutdownCountData = new LinkedHashMap<>();

        // registries
        int registriesCount = getRegistries().size();

        // protocols
        int protocolsCount = getProtocolConfigsBeanMap().size();

        shutdownCountData.put("registries", registriesCount);
        shutdownCountData.put("protocols", protocolsCount);

        // Service Beans
        Map serviceBeansMap = getServiceBeansMap();
        if (!serviceBeansMap.isEmpty()) {
            for (ServiceBean serviceBean : serviceBeansMap.values()) {
                serviceBean.destroy();
            }
        }
        shutdownCountData.put("services", serviceBeansMap.size());

        // Reference Beans
        ReferenceAnnotationBeanPostProcessor beanPostProcessor = getReferenceAnnotationBeanPostProcessor();

        int referencesCount = beanPostProcessor.getReferenceBeans().size();

        beanPostProcessor.destroy();

        shutdownCountData.put("references", referencesCount);

        // Set Result to complete
        Map shutdownData = new TreeMap<>();
        shutdownData.put("shutdown.count", shutdownCountData);


        return shutdownData;
    }

}

• DubboShutdownMetadata继承了AbstractDubboMetadata，它提供了shutdown方法，该方法会遍历getServiceBeansMap，挨个执行serviceBean.destroy()方法，最后执行ReferenceAnnotationBeanPostProcessor.destroy方法

ReferenceAnnotationBeanPostProcessor

dubbo-2.7.3-sources.jar!/org/apache/dubbo/config/spring/beans/factory/annotation/ReferenceAnnotationBeanPostProcessor.java

public class ReferenceAnnotationBeanPostProcessor extends AnnotationInjectedBeanPostProcessor implements
        ApplicationContextAware, ApplicationListener {

    /**
     * The bean name of {@link ReferenceAnnotationBeanPostProcessor}
     */
    public static final String BEAN_NAME = "referenceAnnotationBeanPostProcessor";

    /**
     * Cache size
     */
    private static final int CACHE_SIZE = Integer.getInteger(BEAN_NAME + ".cache.size", 32);

    private final ConcurrentMap> referenceBeanCache =
            new ConcurrentHashMap<>(CACHE_SIZE);

    private final ConcurrentHashMap localReferenceBeanInvocationHandlerCache =
            new ConcurrentHashMap<>(CACHE_SIZE);

    private final ConcurrentMap> injectedFieldReferenceBeanCache =
            new ConcurrentHashMap<>(CACHE_SIZE);

    private final ConcurrentMap> injectedMethodReferenceBeanCache =
            new ConcurrentHashMap<>(CACHE_SIZE);

    private ApplicationContext applicationContext;

    /**
     * To support the legacy annotation that is @com.alibaba.dubbo.config.annotation.Reference since 2.7.3
     */
    public ReferenceAnnotationBeanPostProcessor() {
        super(Reference.class, com.alibaba.dubbo.config.annotation.Reference.class);
    }

    //......

    @Override
    public void destroy() throws Exception {
        super.destroy();
        this.referenceBeanCache.clear();
        this.localReferenceBeanInvocationHandlerCache.clear();
        this.injectedFieldReferenceBeanCache.clear();
        this.injectedMethodReferenceBeanCache.clear();
    }

}

• ReferenceAnnotationBeanPostProcessor继承了AnnotationInjectedBeanPostProcessor，实现了ApplicationContextAware, ApplicationListener接口；destroy方法会执行AnnotationInjectedBeanPostProcessor.destroy，然后清空referenceBeanCache、localReferenceBeanInvocationHandlerCache、injectedFieldReferenceBeanCache、injectedMethodReferenceBeanCache

小结

DubboShutdownMetadata继承了AbstractDubboMetadata，它提供了shutdown方法，该方法会遍历getServiceBeansMap，挨个执行serviceBean.destroy()方法，最后执行ReferenceAnnotationBeanPostProcessor.destroy方法

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