本篇内容介绍了“dubbo spring boot中DubboShutdownMetadata的实例用法”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
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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
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
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
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
“dubbo spring boot中DubboShutdownMetadata的实例用法”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注创新互联网站，小编将为大家输出更多高质量的实用文章！
