Core Concepts
This section of the guide provides the core conceptual concepts that underpin the design of this package.
Bounded Contexts
The Bounded Contexts Chapter explains what a bounded context is, and how this relates to the concept of "modules" in this package.
Layers
The Layers Chapter explains how each bounded context - or module - is divided into layers. Each layer has a specific responsibility and is designed to be as decoupled as possible from the other layers. The layers are:
- Domain
- Application
- Infrastructure
- Presentation
Encapsulation
The Encapsulation Chapter explains how the bounded context is encapsulated. This means the application layer exposes a defined contract to the outside world, while hiding the internal implementation of the domain. It also defines the boundary with the infrastructure layer.
The chapter describes how messages - commands, queries and integration events - are used to pass information between the outside world and the bounded context. It also covers coupling between bounded contexts for context-to-context communication.
Modularisation
The Modularisation Chapter explains how this package's modular approach can be used to split a monolith down into a modular monolith - in an incremental way. This modularisation can then be used to transition to a microservices architecture over time.