Domain Modeling Made Functional

Code Structure Within a Bounded Context

Now let’s look at how the code is structured within a bounded context.

In a traditional “layered approach,” the code is divided into layers: a core domain or business logic layer, a database layer, a services layer, and an API or user interface layer (or some variant of these). A workflow will start at the top layer, work its way down to the database layer, and then return back to the top as shown in the figure.

This approach has many problems, however. One particular issue is that it breaks the important ...