Many of the patterns presented in this chapter provide methods of abstracting functionality and of molding interfaces to look the way you want. Keep in mind that with each layer of abstraction a cost is introduced. Function calls take longer but it is also much more confusing for people who need to understand your code. Tooling can help a little but tracking a function call through nine layers of abstraction is never fun.

Also be wary of doing too much in the façade pattern. It is very easy to turn the façade into a fully-fledged management class and that degrades easily into a God object that is responsible for coordinating and doing everything.