spring启动过程之源码跟踪（中）--spring Debug

上节我们debug到

1 // Tell the subclass to refresh the internal bean factory.2 ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();

我们继续debug 下一步：配置beanfactory的上下文

 1     /** 2      * Configure the factory's standard context characteristics, 3      * such as the context's ClassLoader and post-processors. 4      * @param beanFactory the BeanFactory to configure 5      */ 6     protected void prepareBeanFactory(ConfigurableListableBeanFactory beanFactory) { 7         // Tell the internal bean factory to use the context's class loader. 8         beanFactory.setBeanClassLoader(getClassLoader()); 9 10         // Populate the bean factory with context-specific resource editors.11         beanFactory.addPropertyEditorRegistrar(new ResourceEditorRegistrar(this));12 13         // Configure the bean factory with context callbacks.14         beanFactory.addBeanPostProcessor(new ApplicationContextAwareProcessor(this));15         beanFactory.ignoreDependencyInterface(ResourceLoaderAware.class);16         beanFactory.ignoreDependencyInterface(ApplicationEventPublisherAware.class);17         beanFactory.ignoreDependencyInterface(MessageSourceAware.class);18         beanFactory.ignoreDependencyInterface(ApplicationContextAware.class);19 20         // BeanFactory interface not registered as resolvable type in a plain factory.21         // MessageSource registered (and found for autowiring) as a bean.22         beanFactory.registerResolvableDependency(BeanFactory.class, beanFactory);23         beanFactory.registerResolvableDependency(ResourceLoader.class, this);24         beanFactory.registerResolvableDependency(ApplicationEventPublisher.class, this);25         beanFactory.registerResolvableDependency(ApplicationContext.class, this);26 27         // Detect a LoadTimeWeaver and prepare for weaving, if found.28         if (beanFactory.containsBean(LOAD_TIME_WEAVER_BEAN_NAME) && JdkVersion.isAtLeastJava15()) {29             // Register the (JDK 1.5 specific) LoadTimeWeaverAwareProcessor.30             try {31                 Class ltwapClass = ClassUtils.forName(32                         "org.springframework.context.weaving.LoadTimeWeaverAwareProcessor",33                         AbstractApplicationContext.class.getClassLoader());34                 BeanPostProcessor ltwap = (BeanPostProcessor) BeanUtils.instantiateClass(ltwapClass);35                 ((BeanFactoryAware) ltwap).setBeanFactory(beanFactory);36                 beanFactory.addBeanPostProcessor(ltwap);37             }38             catch (ClassNotFoundException ex) {39                 throw new IllegalStateException("Spring's LoadTimeWeaverAwareProcessor class is not available");40             }41             // Set a temporary ClassLoader for type matching.42             beanFactory.setTempClassLoader(new ContextTypeMatchClassLoader(beanFactory.getBeanClassLoader()));43         }44     }

下面是下一步要debug的内容：

                // Allows post-processing of the bean factory in context subclasses.
                postProcessBeanFactory(beanFactory);

                // Invoke factory processors registered as beans in the context.
                invokeBeanFactoryPostProcessors(beanFactory);

                // Register bean processors that intercept bean creation.
                registerBeanPostProcessors(beanFactory);

                // Initialize message source for this context.
                initMessageSource();

                // Initialize event multicaster for this context.
                initApplicationEventMulticaster();

                // Initialize other special beans in specific context subclasses.
                onRefresh();

                // Check for listener beans and register them.
                registerListeners();

                // Instantiate all remaining (non-lazy-init) singletons.
                finishBeanFactoryInitialization(beanFactory);

                // Last step: publish corresponding event.
                finishRefresh();

初始化singletonbean（DefaultListableBeanFactory.java#preInstantiateSingletons()）

 1     public void preInstantiateSingletons() throws BeansException { 2         if (this.logger.isInfoEnabled()) { 3             this.logger.info("Pre-instantiating singletons in " + this); 4         } 5  6         synchronized (this.beanDefinitionMap) { 7             for (Iterator it = this.beanDefinitionNames.iterator(); it.hasNext();) { 8                 String beanName = (String) it.next(); 9                 RootBeanDefinition bd = getMergedLocalBeanDefinition(beanName);10                 if (!bd.isAbstract() && bd.isSingleton() && !bd.isLazyInit()) {11                     if (isFactoryBean(beanName)) {12                         FactoryBean factory = (FactoryBean) getBean(FACTORY_BEAN_PREFIX + beanName);13                         if (factory instanceof SmartFactoryBean && ((SmartFactoryBean) factory).isEagerInit()) {14                             getBean(beanName);15                         }16                     }17                     else {18                         getBean(beanName);19                     }20                 }21             }22         }23     }

结束动作：发布事件

 1     public void publishEvent(ApplicationEvent event) { 2         Assert.notNull(event, "Event must not be null"); 3         if (logger.isTraceEnabled()) { 4             logger.trace("Publishing event in context [" + getId() + "]: " + event); 5         } 6         getApplicationEventMulticaster().multicastEvent(event); 7         if (this.parent != null) { 8             this.parent.publishEvent(event); 9         }10     }