🏭 What is a Factory Pattern? Create Objects the Smart Way! 🚀

 The Factory Pattern is a Creational Design Pattern that provides a way to create objects without exposing the object creation logic to the client.

Instead of creating objects directly using CREATE OBJECT, the Factory Pattern uses a dedicated factory class to create and return the required object.

📖 Definition

The Factory Pattern provides an interface for creating objects in a superclass, but allows subclasses to alter the type of objects that will be created.

👉 It hides the object creation logic and returns the required object.

🔹 How Factory Pattern Works

1. 👤 Client Request — Requests an object
   ⬇️
2. 🏭 Factory Class — Decides which object to create
   ⬇️
3. Returns the required object:
   🚗 Car Object | 🏍️ Bike Object | 🚚 Truck Object

🔹 Why Use Factory Pattern?

• 🔗 Loose Coupling — Client is not tightly coupled with concrete classes
• 🔧 Better Maintainability — Changes in object creation logic don't affect client code
• 🧩 Improved Flexibility — Easy to introduce new types of objects
• 🧪 Easier Testing — Objects can be easily mocked or replaced
• ♻️ Reusable Logic — Centralized object creation logic can be reused

⚖️ Traditional Approach vs Factory Pattern Approach

❌ Traditional Approach

DATA lo_car TYPE REF TO zcl_car.

CREATE OBJECT lo_car.

🔴 High Coupling: Client knows which class object is being created.

✅ Factory Pattern Approach

DATA lo_vehicle TYPE REF TO zif_vehicle.

lo_vehicle =
  zcl_vehicle_factory=>get_vehicle( 'CAR' ).

🟢 Low Coupling: Client requests the object, factory decides which object to create.

🌍 Real-Life Example

🏭 Vehicle Factory ➡️ 🚗 Car | 🏍️ Bike | 🚚 Truck

💡 Customer requests a vehicle. Factory creates and returns the required vehicle.

💻 Example (ABAP)

INTERFACE zif_vehicle.
  METHODS drive.
ENDINTERFACE.

CLASS zcl_car DEFINITION.
  PUBLIC SECTION.
    INTERFACES zif_vehicle.
ENDCLASS.

CLASS zcl_vehicle_factory DEFINITION.
  PUBLIC SECTION.
    CLASS-METHODS get_vehicle
      IMPORTING iv_type TYPE string
      RETURNING VALUE(ro_vehicle)
        TYPE REF TO zif_vehicle.
ENDCLASS.

🔹 Where Is It Used?

• 📦 RAP Frameworks — Used to create handler / service objects
• ☁️ SAP BTP Applications — Manage services and components creation dynamically
• 🏢 Enterprise Applications — Create objects based on business scenarios
• ⚙️ Service Classes — Factory used to create service implementations
• 👥 Dependency Injection — Helps in decoupling and unit testing

💡 Key Takeaway

Factory Pattern helps developers create objects in a flexible, maintainable and scalable way without being dependent on concrete classes.

🎯 Factory Pattern = Create Objects Smartly, Not Directly!

💬 Have you implemented Factory Pattern in your ABAP projects? Share your experience below!