Domain Driven Design or DDD for short is a huge but interesting topic. It has many complex subjects focused on business and technical perspectives. In the technology industry, people always talk about how both perspectives should work together in order to give the business benefits. However, that is not an easy task and it is when DDD appears in the scene. In this course, you are going to learn the most important concepts of DDD. You will see some concerns, techniques to model, how DDD can be implemented using hexagonal architecture and many other amazing concepts.

Domain Driven Design (DDD) Made Easy

As with any other architectural pattern, hexagonal architecture defines some layers that have to be followed to succeed. Those layers are going to be covered in this lesson. 

# Hexagonal architecture layers
Hexagonal architecture defines four layers to structure a component. As mentioned before, they are focused on all parts an application may have such as frameworks, database connections, business flows, and many more.

## Domain objects 
Located in the center of the hexagon, it contains all objects related to the business. In the Domain-Driven Design terms, business objects are entities, value objects, and aggregates. Additionally, this layer contains all abstractions defined to carry out a business process. The abstractions are factories and the definition of repositories. Services can have two possibilities, if they interact with external dependencies, this layer will only have the definition of them. If not, this layer will have all the implementation.


Learn what hexagonal architecture layers are and how they interact with each other.

Introduction

Mapping Domain to Model

Domain Activities

Domain Objects

Domain Abstractions

Hexagonal Architecture

Layers

Hexagonal architecture layers

Domain objects