Design Patterns - Facade Pattern

Facade Pattern


Provides a unified interface to a set of interfaces in a subsystem. Facade defines a higher-level interface that makes the subsystem easier to use. - Gang of Four

Intent You want to simplify how to use an existing system. You need to define your own interface.
Problem You need to use only a subset of a complex system. Or you need to interact with the system in a particular way
Solution The Facade presents a new interface for the client of existing system to use
Participants and Collaborators The Facade simplifies the use of the required subsystem. However, because the Facade is not complete, certain functionality may be unavailable to the client
Implementation Define a new Class or classes that have the required interface. Have this new class use the system

Facade Example


  • Allows us to avoid tight coupling between Clients and Subsystems
  • Facade still leaves the subsystem accessible to be used directly
  • You can implement more than one facade for a subsystem