• Intent ⇒ provides an interface for creating objects in a superclass (sharing methods —posibbly not all) while allowing for subclasses to alter the type of objects that will be created. Separting the what from the how.
  • Very useful for rapid extensibility (i.e., PnP ⇒ plug and play)
• Logic
  • A single object creator interface with some general methods
    • The responsibility here is to do some business logic the relies on the Produc objects retured by the factory method
    • Common business logic agnostic to the type of product
      • HERE is where you call the product-specific methods (after instantiang the factory method)
  • Factory method is an abstractmethod whose purpose is only to overwrite the given object to be created
    • They instantiate a new object
  • The final concrete object has some unified interface methods
• Pros and cons
  • Pros ⇒
    • avoid tight coupling
    • single responsibility principle ⇒ concentrating object creation in a single palce
    • open-closesd principle (OCP) ⇒ open for extension, closed for modification (existing shared-logic modules—parent classes)
• Client usage
  • The client only instantiates the ConcreteCreator + calls the Creator methods
• Code
  • Use abstractmethod and ABC from abc library
  • Example