leanSpring

A succinct IOC & AOP container. Mainly refer to the github project tiny-Spring. Here are two majority difference.

1. explore the BeanRegistry interface to let BeanDefinitionReader add BeanDefinition into BeanFactory's concurrent hash map.
2. remove the io package and simply the resource as a file location string.

TODD:
[] Add UML and Sequence Diagram

Reference:

1. tiny-Spring
2. toySpring