Structuring Domain Logic in Java: Introducing the Centralized System Class

In the ongoing development of Parcial2-Abatedaga-Tomas-Tema-C-, we recently identified a need to centralize the management of our public works domain. As projects scale, keeping logic organized is key to maintaining a clean and readable codebase.

The Need for Centralization

Previously, logic related to public works was potentially scattered or missing from the core architecture. When managing entities like infrastructure projects, having a single entry point—a "System" class—acts as a manager or facilitator. Think of this as the main office of a city planning department; instead of wandering into individual construction sites, you go to the central office to request status updates or register new projects.

The Implementation

We introduced the SistemaObrasPublicas class to encapsulate the operations related to our domain entities. By creating a dedicated class, we separate concerns and ensure that all business rules regarding the lifecycle of a public work are contained in one location.

public class SistemaObrasPublicas {
    private List<Obra> registros;

    public SistemaObrasPublicas() {
        this.registros = new ArrayList<>();
    }

    public void registrarObra(Obra nuevaObra) {
        registros.add(nuevaObra);
    }

    public List<Obra> obtenerObras() {
        return new ArrayList<>(registros);
    }
}

This structure allows for a clean interface where adding a new project is as simple as calling registrarObra(). It abstracts the underlying storage mechanism, allowing us to swap the ArrayList for a database repository in the future without changing the signature of our public methods.

Why This Matters

Organizing logic into service-style classes prevents "code sprawl." When every feature has a home, developers know exactly where to look when a bug arises or a new requirement is added. It transforms a collection of loose files into a cohesive, maintainable system.

Actionable Takeaway

If you find your main application classes becoming cluttered with domain logic, extract that behavior into a dedicated manager or service class. Aim for one class per domain responsibility to keep your codebase intuitive and modular.

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