Flutter application for retrieve the stargazers of a Github repository.

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During development I followed the approach of the Clean Architecture

Why?

Because Clean Architecture is the most powerful solutions for building clean apps that multiple teams can work on, independent data layers, scalable for adding/removing features, testable, independent frameworks/tools, and can be easily maintained at any time.

The source code is separate into three layers:

• Presentation
• Business Logic
• Data
  • Repository
  • Data Provider

The data layer's responsibility is to retrieve/manipulate data from one or more sources.

The data layer can be split into two parts:

• Repository
• Data Provider

This layer is the lowest level of the application and interacts with databases, network requests, and other asynchronous data sources.

The data provider's responsibility is to provide raw data. The data provider should be generic and versatile.

The data provider will usually expose simple APIs to perform operations. Most of the time is a library shared and imported into the project. It can be multiple data provider in a project, es. one for fetch the data from the network and one from the database. The goal is to make simple and usable as possible.

The repository layer is a wrapper around one or more data providers with which the Business Logic Layer communicates.

The repository layer can interact with multiple data providers and perform transformations on the data before handing the result to the business logic Layer.

The business logic layer's responsibility is to respond to input from the presentation layer with new states. This layer can depend on one or more repositories to retrieve data needed to build up the application state.

Think of the business logic layer as the bridge between the user interface (presentation layer) and the data layer. The business logic layer is notified of events/actions from the presentation layer and then communicates with repository in order to build a new state for the presentation layer to consume.

The presentation layer's responsibility is to figure out how to render itself based on one or more business logic states. In addition, it should handle user input and application lifecycle events.

The application flows will start with a AppStart event which triggers the application to fetch some data to present to the user. In addition, the presentation layer will have to figure out what to render on the screen based on the state from the business logic layer.

This app used

• flutter_bloc make it easy to implement the BLoC (Business Logic Component) design pattern. Built to be used with the bloc state management package.
• flow_builder which simplifies flows with a flexible, declarative API.
• url_launcher for launching a URL. Supports web, phone, SMS, and email schemes.
• retrofit for network call.
• json_serializable for automatically generate code for converting to and from JSON by annotation.
• equatable for helps to implement value based equality without needing to explicitly override == and hashCode.
• tuple tuple data structure