脚本宝典收集整理的这篇文章主要介绍了Dubbo解析之初始化过程分析，脚本宝典觉得挺不错的，现在分享给大家，也给大家做个参考。
public class DefaultBeanDefinitionDocumentReader implements BeanDefinitionDocumentReader { protected void parseBeanDefinitions(Element root, BeanDefinitionParserDelegate delegate) { if (delegate.isDefaultNamespace(root)) { NodeList nl = root.getChildNodes(); for (int i = 0; i < nl.getLength(); i++) { Node node = nl.item(i); if (node instanceof Element) { Element ele = (Element) node; if (delegate.isDefaultNamespace(ele)) { parseDefaultElement(ele, delegate); } else { delegate.parseCustomElement(ele); } } } } else { delegate.parseCustomElement(root); } } }
public class BeanDefinitionParserDelegate { public BeanDefinition parseCustomElement(Element ele, BeanDefinition containingBd) { //在Dubbo中，namespaceUri就是http://dubbo.apache.org/schema/dubbo String namespaceUri = getNamespaceURI(ele); //根据命名空间获取处理类 NamespaceHandler handler = this.readerContext.getNamespaceHandlerResolver().resolve(namespaceUri); if (handler == null) { error("Unable to locate Spring NamespaceHandler for XML schema namespace [" + namespaceUri + "]", ele); return null; } //调用方法，完成对Bean的加载和注册 return handler.parse(ele, new ParserContext(this.readerContext, this, containingBd)); } }
http://dubbo.apache.org/schema/dubbo= com.alibaba.dubbo.config.spring.schema.DubboNamespaceHandler http://code.alibabatech.com/schema/dubbo= com.alibaba.dubbo.config.spring.schema.DubboNamespaceHandler
NamespaceHandler namespaceHandler = (NamespaceHandler) BeanUtils.instantiateClass(handlerClass);
namespaceHandler.init();
handlerMappings.put(namespaceUri, namespaceHandler);
public class DubboNamespaceHandler extends NamespaceHandlerSupport { public void init() { registerBeanDefinitionParser("application", new DubboBeanDefinitionParser(ApplicationConfig.class, true)); registerBeanDefinitionParser("module", new DubboBeanDefinitionParser(ModuleConfig.class, true)); registerBeanDefinitionParser("registry", new DubboBeanDefinitionParser(RegistryConfig.class, true)); registerBeanDefinitionParser("monitor", new DubboBeanDefinitionParser(MonitorConfig.class, true)); registerBeanDefinitionParser("provider", new DubboBeanDefinitionParser(ProviderConfig.class, true)); registerBeanDefinitionParser("consumer", new DubboBeanDefinitionParser(ConsumerConfig.class, true)); registerBeanDefinitionParser("protocol", new DubboBeanDefinitionParser(ProtocolConfig.class, true)); registerBeanDefinitionParser("service", new DubboBeanDefinitionParser(ServiceBean.class, true)); registerBeanDefinitionParser("reference", new DubboBeanDefinitionParser(ReferenceBean.class, false)); registerBeanDefinitionParser("annotation", new AnnotationBeanDefinitionParser()); } }
public abstract class NamespaceHandlerSupport implements NamespaceHandler { public BeanDefinition parse(Element element, ParserContext parserContext) { return findParserForElement(element, parserContext).parse(element, parserContext); } private BeanDefinitionParser findParserForElement(Element element, ParserContext parserContext) { //获取配置文件中的节点名称 String localName = parserContext.getDelegate().getLocalName(element); //找到对应的处理类返回 BeanDefinitionParser parser = this.parsers.get(localName); return parser; } }
dubbo_producer1=Root bean: class [com.alibaba.dubbo.config.ApplicationConfig]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null, dubbo=Root bean: class [com.alibaba.dubbo.config.ProtocolConfig]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null, com.alibaba.dubbo.config.RegistryConfig=Root bean: class [com.alibaba.dubbo.config.RegistryConfig]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null, com.viewscenes.netsupervisor.service.InfoUserService=Root bean: class [com.alibaba.dubbo.config.spring.ServiceBean]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null, infoUserService=Generic bean: class [com.viewscenes.netsupervisor.service.impl.InfoUserServiceImpl]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null; defined in class path resource [dubbo_provider1.xml]
package com.alibaba.dubbo.config.spring; public class ServiceBean<T> extends ServiceConfig<T> implements InitializingBean, DisposableBean, ApplicationContextAware, ApplicationListener<ContextRefreshedEvent>, BeanNameAware { public void setApplicationContext(ApplicationContext applicationContext) { this.applicationContext = applicationContext; //...... } public void onApplicationEvent(ContextRefreshedEvent event) { //服务暴露 export(); } public void afterPropertiesSet() throws Exception { //类初始化方法 //...... } }
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