文章目录

• bean 核心类
  • beanFactory
• bean definition
  • ConfigurableListableBeanFactory
  • AbstractRefreshableApplicationContext
• bean creation
  • DefaultSingletonBeanRegistry
  • AbstractAutowireCapableBeanFactory
  • AbstractBeanFactory

• spring使用版本 4.3.14.RELEASE

bean 核心类

beanFactory

最直接的就是源码部分注释：

• factory: hold beanDefinitions
• bean: bean unique name
• registry: a central registry of application components
  
  
• bean life cycle
  
  
  
• getBean
  

bean definition

ConfigurableListableBeanFactory

```java
BeanDefinition getBeanDefinition(String beanName) throws NoSuchBeanDefinitionException;
```	

AbstractRefreshableApplicationContext

• loadBeanDefinitions

bean creation

• BeanCurrentlyInCreationException
  
• AbstractAutowireCapableBeanFactory extends DefaultSingletonBeanRegistry
  

DefaultSingletonBeanRegistry

• doCreateBean 大体流程：
  • // Instantiate the bean.
  • // Allow post-processors to modify the merged bean definition.
  • // Eagerly cache singletons to be able to resolve circular references even when triggered by lifecycle interfaces like BeanFactoryAware.
  • // Initialize the bean instance.
  • // Register bean as disposable.
    

AbstractAutowireCapableBeanFactory

protected Object createBean

AbstractBeanFactory

protected <T> T doGetBean