January 2015
Intermediate to advanced
212 pages
4h 22m
English
Content preview from Mastering Python Design PatternsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 6. The Facade Pattern
As systems evolve, they can get very complex. It is not unusual to end up with a very large (and sometimes confusing) collection of classes and interactions. In many cases, we don't want to expose this complexity to the client. The Facade (also known as Façade) design pattern helps us to hide the internal complexity of our systems and expose only what is necessary to the client through a simplified interface [Eckel08, page 209]. In essence, Facade is an abstraction layer implemented over an existing complex system.
The role of Facade is demonstrated in the following figure. The figure is a class diagram representation of Wikipedia's Java Facade example [j.mp/wikifac]. A computer is a complex machine that depends on ...
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