Get Your Hands Dirty on Clean Architecture (Java Talks 12/2019)

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@TomHombergs https://reflectoring.io Get Your Hands Dirty on Clean Architecture

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@TomHombergs https://reflectoring.io Layers

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@TomHombergs https://reflectoring.io Why bother with architecture?

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@TomHombergs https://reflectoring.io Architecture Goals

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@TomHombergs https://reflectoring.io Architecture Goals

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@TomHombergs https://reflectoring.io The Ultimate Goal of Architecture The goal of software architecture is to minimize the lifetime cost of the software

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@TomHombergs https://reflectoring.io So ... what‘s wrong with layers?

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@TomHombergs https://reflectoring.io Disclaimer Layers are a solid   architecture pattern! But without additional restrictions they tend to erode

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@TomHombergs https://reflectoring.io Layers Promote Database-Driven Design

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@TomHombergs https://reflectoring.io Layers Promote Hard-to-test Shortcuts

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@TomHombergs https://reflectoring.io Layers Promote Hidden Functionality

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@TomHombergs https://reflectoring.io Do circles instead!

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@TomHombergs https://reflectoring.io SOLID Principles S O L I D Single Responsibility Principle Open-Closed Principle Liskov Substitution Principle Interface Segregation Principle Dependency Inversion Principle

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@TomHombergs https://reflectoring.io Dependency Inversion Principle SOLID Principles S O L I D Single Responsibility Principle Open-Closed Principle Liskov Substitution Principle Interface Segregation Principle

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@TomHombergs https://reflectoring.io Dependency Inversion Principle

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@TomHombergs https://reflectoring.io Dependency Inversion Principle We can choose the direction of any code dependency* * As long as we have control over the code

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@TomHombergs https://reflectoring.io Clean Architecture (Robert C. Martin)

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@TomHombergs https://reflectoring.io Single Responsibility Principle Dependency Inversion Principle SOLID Principles S O L I D Open-Closed Principle Liskov Substitution Principle Interface Segregation Principle

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@TomHombergs https://reflectoring.io Single Responsibility Principle

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@TomHombergs https://reflectoring.io Single Responsibility Principle A module* should have only one reason to change * or class, package, component, architecture element, software entity, …

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@TomHombergs https://reflectoring.io Single Responsibility Principle – Micro Level

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@TomHombergs https://reflectoring.io Single Responsibility Principle – Micro Level

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@TomHombergs https://reflectoring.io Single Responsibility Principle – Macro Level

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@TomHombergs https://reflectoring.io Single Responsibility Principle – Macro Level

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@TomHombergs https://reflectoring.io Domain-Driven Design Only a domain-centric architecture allows Domain-Driven Design

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@TomHombergs https://reflectoring.io Or do hexagons instead!

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@TomHombergs https://reflectoring.io Hexagonal Architecture / Ports & Adapters (Alistair Cockburn)

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@TomHombergs https://reflectoring.io Choose your Polygonal Style

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@TomHombergs https://reflectoring.io Quiz: What does this Application do?

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@TomHombergs https://reflectoring.io Quiz: What does this Application do?

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@TomHombergs https://reflectoring.io Let‘s get our hands dirty! Code Example: https://github.com/thombergs/buckpal

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@TomHombergs https://reflectoring.io Conclusion

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@TomHombergs https://reflectoring.io Benefits of a Domain-Centric Architecture

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@TomHombergs https://reflectoring.io Drawbacks of a Domain-Centric Architecture

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@TomHombergs https://reflectoring.io Thank you for your Patience …if you promise to post a review on Amazon :) https://speakerdeck.com/thombergs/2019 Slides! https://reflectoring.io/javatalks Free ebook! Pretty Book Covers!