Singleton Design Pattern in Flutter

This project demonstrates the implementation of the Singleton Design Pattern in a Flutter application. The Singleton pattern ensures that only one instance of a class is created and provides a global point of access to it.

Project Structure

The project consists of the following files:

1. database.dart: Contains the Database class, which implements the Singleton pattern.
2. client.dart: Contains the Client class, which tests the Singleton implementation.
3. main.dart: The entry point of the Flutter application.

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How It Works

Singleton Implementation (database.dart)

• The Database class uses a private constructor (_internal) and a static instance (_instance) to ensure only one instance of the class is created.
• A factory constructor (factory Database()) checks if an instance already exists. If it does, it returns the existing instance; otherwise, it creates a new one.
• The createDatabase() method simulates the creation of a database.

Testing the Singleton Pattern (client.dart)

• The Client class creates two instances of the Database class using the Database() factory constructor.
• It checks if both instances are the same using the identical() function.
• If the instances are the same, it confirms that the Singleton pattern is working correctly.

Entry Point (main.dart)

• The main.dart file initializes the Client class and calls the checkSingletonPattern() method to verify the Singleton implementation.