Gateway pattern

  • encapsulates access to an external system or resource

  • A gateway class provides a simplified way of interacting with something external that perhaps has a peculiar or difficult API.

  • A gateway class can be created to facilitate interaction with this external system

  • keep software soft by abstracting and insulating the system being developed from its external dependencies

  • By also defining an interface for the gateway, it makes it possible to provide fake versions for testing purposes or swap out one third-party address validation service for another without the change rippling throughout the system.

  • The gateway also helps to deal with anything unique to the external service

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