PDF《第3 章》

} protected T doGetBean(final String name, @Nullable final Class requiredType,@Nullable final Object[] args, boolean typeCheckOnly) throws BeansException { final String beanName = transformedBeanName(name);

Object bean;

// Eagerly check singleton cache for manually registered singletons. Object sharedInstance = getSingleton(beanName);

//省略代码 } @Nullable protected Object getSingleton(String beanName, boolean allowEarlyReference) { Object singletonObject = this.singletonObjects.get(beanName);

if (singletonObject == null &

&

isSingletonCurrentlyInCreation (beanName)) { synchronized (this.singletonObjects) { singletonObject = this.earlySingletonObjects.get(beanName);

if (singletonObject == null &

&

allowEarlyReference) { ObjectFactory singletonFactory = this.singletonFacto........