Three-Tier Microservices

We can apply good old-fashioned ideas of three-tier architecture to individual microservices. Some of the benefits are:

• good separation of concerns

• clear test boundaries

• most of our tests can be more simple.

I want to write about this. For now, here are some references:

• PresentationDomainDataLayering (article by Martin Fowler)

• Hexagonal Architecture (article by Alistair Cockburn)

• Perhaps this (not sure yet): Hexagonal Architecture: Scaling Across Multiple Concurrent Teams (article by Cory Foy)

• TDD, where did it all go wrong? (great talk by Ian Cooper)

• Structuring Clojure Web Applications (article by James Reeves)

• Google for three tier web service hexagonal.