spring启动过程之源码跟踪（中）--spring Debug

上节我们debug到

// 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

/**
* Configure the factory's standard context characteristics,
* such as the context's ClassLoader and post-processors.
* @param beanFactory the BeanFactory to configure
*/
protected void prepareBeanFactory(ConfigurableListableBeanFactory beanFactory) {
// Tell the internal bean factory to use the context's class loader.
beanFactory.setBeanClassLoader(getClassLoader());

// Populate the bean factory with context-specific resource editors.
beanFactory.addPropertyEditorRegistrar(new ResourceEditorRegistrar(this));

// Configure the bean factory with context callbacks.
beanFactory.addBeanPostProcessor(new ApplicationContextAwareProcessor(this));
beanFactory.ignoreDependencyInterface(ResourceLoaderAware.class);
beanFactory.ignoreDependencyInterface(ApplicationEventPublisherAware.class);
beanFactory.ignoreDependencyInterface(MessageSourceAware.class);
beanFactory.ignoreDependencyInterface(ApplicationContextAware.class);

// BeanFactory interface not registered as resolvable type in a plain factory.
// MessageSource registered (and found for autowiring) as a bean.
beanFactory.registerResolvableDependency(BeanFactory.class, beanFactory);
beanFactory.registerResolvableDependency(ResourceLoader.class, this);
beanFactory.registerResolvableDependency(ApplicationEventPublisher.class, this);
beanFactory.registerResolvableDependency(ApplicationContext.class, this);

// Detect a LoadTimeWeaver and prepare for weaving, if found.
if (beanFactory.containsBean(LOAD_TIME_WEAVER_BEAN_NAME) && JdkVersion.isAtLeastJava15()) {
// Register the (JDK 1.5 specific) LoadTimeWeaverAwareProcessor.
try {
Class ltwapClass = ClassUtils.forName(
"org.springframework.context.weaving.LoadTimeWeaverAwareProcessor",
AbstractApplicationContext.class.getClassLoader());
BeanPostProcessor ltwap = (BeanPostProcessor) BeanUtils.instantiateClass(ltwapClass);
((BeanFactoryAware) ltwap).setBeanFactory(beanFactory);
beanFactory.addBeanPostProcessor(ltwap);
}
catch (ClassNotFoundException ex) {
throw new IllegalStateException("Spring's LoadTimeWeaverAwareProcessor class is not available");
}
// Set a temporary ClassLoader for type matching.
beanFactory.setTempClassLoader(new ContextTypeMatchClassLoader(beanFactory.getBeanClassLoader()));
}
}

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()）

public void preInstantiateSingletons() throws BeansException {
if (this.logger.isInfoEnabled()) {
this.logger.info("Pre-instantiating singletons in " + this);
}

synchronized (this.beanDefinitionMap) {
for (Iterator it = this.beanDefinitionNames.iterator(); it.hasNext();) {
String beanName = (String) it.next();
RootBeanDefinition bd = getMergedLocalBeanDefinition(beanName);
if (!bd.isAbstract() && bd.isSingleton() && !bd.isLazyInit()) {
if (isFactoryBean(beanName)) {
FactoryBean factory = (FactoryBean) getBean(FACTORY_BEAN_PREFIX + beanName);
if (factory instanceof SmartFactoryBean && ((SmartFactoryBean) factory).isEagerInit()) {
getBean(beanName);
}
}
else {
getBean(beanName);
}
}
}
}
}

结束动作：发布事件

public void publishEvent(ApplicationEvent event) {
Assert.notNull(event, "Event must not be null");
if (logger.isTraceEnabled()) {
logger.trace("Publishing event in context [" + getId() + "]: " + event);
}
getApplicationEventMulticaster().multicastEvent(event);
if (this.parent != null) {
this.parent.publishEvent(event);
}
}