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What is the difference between an 'Abstraction' and a 'Facade'?
Is there a difference at all? Or are the terms interchangeable?
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No, I's not the same. For implementing Facade design pattern is not necessary to implement any interface. It just provide a new layer to communicate to your services, as an example. So it will give you one point to communicate with all services that are related.
The main difference between factory and facade design pattern is that factory is a creational design pattern that defines an interface or an abstract class to create an object, while the facade is a structural design pattern that provides a simplified interface to represent a set of interfaces in a subsystem to hide ...
Usage. A Facade is used when an easier or simpler interface to an underlying object is desired. Alternatively, an adapter can be used when the wrapper must respect a particular interface and must support polymorphic behavior. A decorator makes it possible to add or alter behavior of an interface at run-time.
Facade is a part of Gang of Four design pattern and it is categorized under Structural design patterns.
The facade pattern is an simplified interface to a larger, possibly more complex code base. The code base may be a single class, or more. The facade just gives you a simple interface to it.
Abstraction, is used to represent a concept, but not to be bound to any specific instance. (Ie: An abstract class). This doesn't imply simplifying (like the facade pattern does), but rather making a 'common' interface or representation.
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Facade is a specific design pattern, meant to hide the internal stuff inside a package / module from its clients behind a well-defined interface. It usually hides several interfaces/classes behind a single common one, hence its name.
'Abstraction' is a general term, meaning to hide the concrete details of something from the outside world.
So these two are not interchangeable terms.
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