Web App System Design

Anemic Domain Model: Model View Controller (MVC)

In backend, there are 3 types of classes.

• Repository: It visites data.
• Service: It deals with business logic.
• Controller: It exposes the endpoints.

In Service, we have 2 classes, Service and BussinessObject. BussinessObject (BO) class processes data only. It hasn't logic codes which are in the Service class.

The class that only contains data are called Anemic Domain Model.

Anemic Domain Model splits the data and the operation, destroyes the encapsulation of OOP. Data can be modified without the limit.

Rich Domain Model: Domain Driven Design (DDD)

DDD also has 3 types of classes, Repository, Service, Controller. But in Service, It has Service class and Domain class.

Unlike BussinessObject, Domain has data and bussiness logic. We use Service to connect Repository to get data, and put other bussiness logic code to Domain.

To sum up, Domain is a BO with methods.