Scala and Clean-Architecture

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Scala and Clean- Architecture by Sebastian Nozzi

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Part I Screaming

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What do the following pictures *SCREAM* at you?

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Church?

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Stadium?

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Airport?

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What about your codebase? What does it scream?

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Does it scream... I'm an Accounting System! I'm a Community Portal! I'm a CRM-System!

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Or rather... I'm a Web-based App! I use the Play-Framework! Database FTW!

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Here's the idea Put your app, your domain problem, at the center The "web", database, framework, etc. are details

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Part II The Concept

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Nothing new or revolutionary really...

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It looks like this

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Application Core

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Interface Adapters

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Frameworks & Drivers

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Whole Picture Source: https://blog.8thlight.com/uncle-bob/2012/08/13/the-clean-architecture.html

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Another view Source: http://www.planetgeek.ch/2013/11/26/chop-onions-instead-of-layers/

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Why is this good? Good Design Clean boundaries / roles Easy to fix, refactor, extend, re-use Easy and fast to test etc.

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Good Thing™ (right?)

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Part III Scala

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Why is Scala well suited?

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Scala. Recap: Object Oriented and Functional

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Culture Language Scala

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Some aspects: Case-classes Immutability Collections Objects val(ues) Implicits Data-transformations For-comprehensions Lazyness / Rective(ness) etc.

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Specific to Play: Async. results (Futures) Parametrized Views Dep. Injection etc.

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Applied to this...

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Conclusions Clean code / architecture has its advantages Scala, the language and the culture, support these notions well

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Some Resources by Robert C. Martin by Alistair Cockburn by Jeffrey Palermo from a post by Robert C. Martin from James Coplien, and Trygve Reenskaug by Ivar Jacobson from his book Object Oriented Software Engineering: A Use-Case Driven Approach and many more... Clean Architecture Hexagonal Architecture Onion Architecture Screaming Architecture DCI BCE

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