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Design patterns

	Definition	Example	Links
Adapter	Enable incompatible interfaces to interoperate	Plug an older object into a newer system	Adapter vs Bridge Wikipedia
Bridge	Enable separation by connecting heirarchies of classes to enable both to vary independently (avoids a combinatorial explosion as well) recommended - avoid compile time dependency between the two ^programmatic definition, no client/server conceptualisation	Shapes and Drawing APIs, Devices and Platforms	Adapter vs Bridge Wikipedia
Gateway	Either API gateway (by service provider) or application gateway (by client) minimise latency in calls to subsystems by centralising it in one place can play an orchestration role handle cross-cutting concerns across subsystems translate vocabularies between client and service can be adapter, facade, mediator		Fowler
Facade	Simplified interface to a complex system	Higher level entry point to e.g. posix serial api	Wikipedia
Proxy	Substitute or extend a real object's interface	Mocking a robot system for simulation	Wikipedia

Technical Notes