org.springframework.beans.factory.support.DefaultListableBeanFactory#registerBeanDefinition
public void registerBeanDefinition(String beanName, BeanDefinition beanDefinition) throws BeanDefinitionStoreException {
Assert.hasText(beanName, "Bean name must not be empty");
Assert.notNull(beanDefinition, "BeanDefinition must not be null");
if (beanDefinition instanceof AbstractBeanDefinition) {
try {
((AbstractBeanDefinition)beanDefinition).validate();
} catch (BeanDefinitionValidationException var7) {
throw new BeanDefinitionStoreException(beanDefinition.getResourceDescription(), beanName, "Validation of bean definition failed", var7);
}
}
BeanDefinition oldBeanDefinition;
//对注册过程加锁，保证数据一致性
synchronized(this.beanDefinitionMap) {
oldBeanDefinition = (BeanDefinition)this.beanDefinitionMap.get(beanName);
//判断是否已经有同名的beandefinition已经在IOC容器中了，如果有，同时又不可以覆盖，就报错
if (oldBeanDefinition != null) {
if (!this.allowBeanDefinitionOverriding) {
throw new BeanDefinitionStoreException(beanDefinition.getResourceDescription(), beanName, "Cannot register bean definition [" + beanDefinition + "] for bean '" + beanName + "': There is already [" + oldBeanDefinition + "] bound.");
}
if (this.logger.isInfoEnabled()) {
this.logger.info("Overriding bean definition for bean '" + beanName + "': replacing [" + oldBeanDefinition + "] with [" + beanDefinition + "]");
}
} else {
//这是注册BeanDefinition的过程，把bean的名字存入到beanDefinitionNames中，同时存入beanDefinitionMap中
this.beanDefinitionNames.add(beanName);
this.frozenBeanDefinitionNames = null;
}
this.beanDefinitionMap.put(beanName, beanDefinition);
}
if (oldBeanDefinition != null || this.containsSingleton(beanName)) {
this.resetBeanDefinition(beanName);
}
}
