When to use it Abstract Factory Design Pattern

 👉👉👉👉Differences between Abstract Factory and Factory Method Design Pattern

The Abstract Factory Design Pattern is particularly useful in situations where:

1. Need to Create Families of Related Objects

When your system needs to handle multiple families of related or dependent objects without specifying their concrete classes. For example, a user interface toolkit that supports different themes (e.g., dark mode, light mode) might require different sets of components (buttons, text boxes) for each theme.

2. Product Variations

When you have multiple product variations that need to work together. If you need to ensure that all products in a family are compatible with each other, the Abstract Factory helps by providing a way to create these products in a cohesive manner.

3. Object Creation is Decoupled from Use

When you want to decouple the creation of objects from their use. The Abstract Factory provides an interface for creating objects, which allows the client code to remain independent of the concrete classes being instantiated.

4. System is Configured to Work with Multiple Product Families

When your system needs to support multiple product families, and you want to switch between these families easily. For example, a system that needs to support both Windows and Mac platforms with different sets of components can use Abstract Factory to manage these variations.

5. Consistency Among Related Products

When you need to ensure consistency among related products. The Abstract Factory guarantees that a set of related products are created together, ensuring that they fit together and work as intended.

Example Scenarios

1. User Interface Libraries

If you are developing a UI library that needs to work across different platforms (e.g., Windows, Mac, Linux), you can use the Abstract Factory to create platform-specific components (buttons, text boxes, menus) while ensuring they are consistent with each other.

public interface IUIFactory
{
    IButton CreateButton();
    ITextBox CreateTextBox();
}

public class WindowsFactory : IUIFactory
{
    public IButton CreateButton() => new WindowsButton();
    public ITextBox CreateTextBox() => new WindowsTextBox();
}

public class MacFactory : IUIFactory
{
    public IButton CreateButton() => new MacButton();
    public ITextBox CreateTextBox() => new MacTextBox();
}

C#

2. Document Management Systems

For a document management system that supports multiple formats (e.g., PDF, Word), you can use Abstract Factory to create readers, editors, and savers for each document format.

public interface IDocumentFactory
{
    IReader CreateReader();
    IEditor CreateEditor();
    ISaver CreateSaver();
}

public class PdfDocumentFactory : IDocumentFactory
{
    public IReader CreateReader() => new PdfReader();
    public IEditor CreateEditor() => new PdfEditor();
    public ISaver CreateSaver() => new PdfSaver();
}

public class WordDocumentFactory : IDocumentFactory
{
    public IReader CreateReader() => new WordReader();
    public IEditor CreateEditor() => new WordEditor();
    public ISaver CreateSaver() => new WordSaver();
}

C#

3. Game Development

In game development,if you need to create different sets of game objects (e.g., enemies, weapons)
for different levels or settings, you can use Abstract Factory to manage these
variations.
public interface IGameFactory
{
    IEnemy CreateEnemy();
    IWeapon CreateWeapon();
}

public class EasyLevelFactory : IGameFactory
{
    public IEnemy CreateEnemy() => new EasyEnemy();
    public IWeapon CreateWeapon() => new BasicWeapon();
}

public class HardLevelFactory : IGameFactory
{
    public IEnemy CreateEnemy() => new HardEnemy();
    public IWeapon CreateWeapon() => new AdvancedWeapon();
}
C#
Summary
Use the Abstract Factory Design Pattern when:
You need to create families of related objects.
You want to ensure that objects from a family are used together.
Your system needs to support multiple product families and you want to keep your client code decoupled from concrete implementations.
You want to provide a consistent interface for creating related objects.
This pattern helps in managing complex object creation logic, ensuring consistency, 
and providing flexibility in how objects are created and used. 

Author : Dotnet Office | https://www.youtube.com/TheDotNetOffice

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