Developing the structure

In the previous chapters, we defined our domains, which are as follows:

• SportNewsService
• PoliticsNewsService
• FamousNewsService
• RecomendationService
• UsersService

The first step is to choose a domain to apply our techniques. To do this, we will use the UsersService. This domain is quite interesting because it has unique characteristics and is an excellent case to apply the techniques learned here.

Let's gather the tools that we will use for the composition of UsersService. At first, we will use only one database table, but we know that the rest will be created.

Database

Our database is a PostgreSQL and the structure of the first table is extremely simple, as seen in the following screenshot:

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