Clean architectureAndrzej Bednarz

andbedwroc@gmail.comhttps://github.com/andbed/clean-architecture

05.07.2014

A new project

Self testing software

Clean architecture

Demo• Basic structure• Input/output

Application Core

Source: Uncle Bob, http://blog.8thlight.com/uncle-bob/2011/11/22/Clean-Architecture.html

Controller -> Interactor

Source: Uncle Bob, http://blog.8thlight.com/uncle-bob/2011/11/22/Clean-Architecture.html

Controller <- Interactor

Source: Uncle Bob, http://blog.8thlight.com/uncle-bob/2011/11/22/Clean-Architecture.html

Source: Uncle Bob, http://blog.8thlight.com/uncle-bob/2011/11/22/Clean-Architecture.html

Traditional layered architecture

Clean architecture

Source: Uncle Bob, http://blog.8thlight.com/uncle-bob/2012/08/13/the-clean-architecture.html

Hexagonal Architecture

Summary

We are still on the way...

Excellent testability

Every component and layer could be tested in isolation

Clearly defined separation of concerns

Flexibility

Gradual architecture introduction

Lots of additional classes and interfaces

Lots of DTOs and conversions

Cost

Source: David Heinemeier Hansson, https://gist.github.com/dhh/4849a20d2ba89b34b201Based on: Jim Weirich's "Decoupling from Rails"

Source: David Heinemeier Hansson, https://gist.github.com/dhh/4849a20d2ba89b34b201Based on: Jim Weirich's "Decoupling from Rails"

Source: David Heinemeier Hansson, https://gist.github.com/dhh/4849a20d2ba89b34b201Based on: Jim Weirich's "Decoupling from Rails"

Not new

Not only Java related

Not a rocket science

Not home-grown

Referenceshttp://blog.8thlight.com/uncle-bob/2012/08/13/the-clean-architecture.htmlhttp://blog.8thlight.com/uncle-bob/2011/11/22/Clean-Architecture.htmlhttp://blog.8thlight.com/uncle-bob/2011/09/30/Screaming-Architecture.htmlhttp://alistair.cockburn.us/Hexagonal+architecturehttp://www.growing-object-oriented-software.com/http://jeffreypalermo.com/blog/the-onion-architecture-part-1/http://martinfowler.com/articles/is-tdd-dead/https://groups.google.com/forum/#!forum/clean-code-discussionhttp://en.wikipedia.org/wiki/Data,_context_and_interactionhttp://andrzejonsoftware.blogspot.com/2013/12/the-four-architectures-that-will.htmlObject Oriented Software Engineering: A Use Case Driven Approach, Ivar Jacobson, 1992

Examples

https://github.com/andbed/clean-architecturehttp://obvious.retromocha.com/https://github.com/michelchenrich/crudrefactorkata.githttps://github.com/lukasz-duda/ArchitectureSamplehttp://www.whitewashing.de/2012/08/13/oop_business_applications_entity_boundary_interactor.html

Thank you!