What is the difference between Facade and Gateway design patterns?

design-patterns gateway facade
antz picture antz · Dec 12, 2010 · Viewed 30.9k times · Source

or Facade==Gateway?

Answer

Brian Drummond picture Brian Drummond · Nov 21, 2012

Reviewing Facade in the GoF book and the link in another answer to Martin Fowler's Gateway, it appears that their focus is in opposite directions.

Facade provides a simple uniform view of complex internals to (one or more) external clients;

Gateway provides a simple uniform view of external resources to the internals of an application.

This distinction lets us focus on which is more important in a design:

With the Facade, the external system is our customer; it is better to add complexity facing inwards if it makes the external interface simpler.

With the Gateway, the internal system is our customer; give it all the help we can, even if the externals are more complex.

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