Summary
In this chapter, we have learned how to use the facade pattern. This pattern is ideal for providing a simple interface to client code that wants to use a complex system but does not need to be aware of the system's complexity. A computer is a facade since all we need to do to use it is press a single button for turning it on. All the rest of the hardware complexity is handled transparently by the BIOS, the boot loader, and the other components of the system software. There are more real-life examples of facade, such as when we are connected to the customer service department of a bank or a company, and the keys that we use to turn a vehicle on.
We discussed a Django third-party module that uses Facade: django-oscar-datacash. It uses the facade pattern to provide a simple DataCash API and the ability to save transactions.
We covered the basic use cases of facade and ended the chapter with an implementation of the interface used by a multiserver operating system. A facade is an elegant...
