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The Dependency Inversion Principle

Explore the Dependency Inversion Principle to understand how inverting dependencies between domain and persistence layers improves modularity and reduces reasons for change. This lesson helps you grasp key concepts to separate concerns and create maintainable software architectures.

Dependency in layered architecture

In our layered architecture, the cross-layer dependencies always point downward to the next layer. When we apply the Single Responsibility Principle on a high level, we notice that the upper layers have more reasons to change than the lower layers.

Thus, due to the domain layer’s dependency to the persistence layer, each change in the ...