Smart Domain Pattern 的核心思想和适用场景是什么？
- Object-Oriented Approach（No service）
- Model as fully connected object graph （Not disconnected aggreation）
- Direcly map to restful API（with HATEOAS）
- Act as an absracion layer to hide implentation details
- Consistent between conceptual model / model / api
Entity is not about value，but about identity and association。
Can be mapped easily as s lossess representation model
Association is as abstraction mechanism for connections
Association is as abstraction mechanism for lifecycle
kenk back CRC 法
Restful 不是关于 get put put post，而是学习了互联网架构模式（数据表达行为），和面向对象本书数据抽象行为一致