Overview

Data Layer

The data layer of an app contains the business logic. The business logic is what gives value to our app—it's made of rules that determine how our app creates, stores, and changes data.

• Database and Migrations
• DAOs and Repositories

Domain Layer

The domain layer is responsible for encapsulating complex business logic, or simple business logic that is reused by multiple Clients. To keep these controllers simple and lightweight, each use case should only have responsibility over a single functionality, and they should not contain mutable data. You should instead handle mutable data in your UI or data layers.

• Controllers and CRUDs
• Routing
• Authorization, authentication and routing end-points
• Testability of the app

UI Layer

The role of the UI is to display the application data on the screen and also to serve as the primary point of user interaction.

• Basic UI elements
• Pre-built UI elements and utilities
  • Drop down list
• Events, data and state flow
  • Network call and Basic network call
• Components and view models
  • Observable
• Threading and concurrency
• Network Calls and DTOs
  • With loading and error
• Show in-progress operations
• Show errors on the screen
• Navigation common patterns
  • matchFirst

External materials

• Kotlin Idioms