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Software Architecture with Kotlin

You're reading from   Software Architecture with Kotlin Analyze, combine, and terraform various architecture styles for sustainable and scalable software

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Product type Paperback
Published in Dec 2024
Publisher Packt
ISBN-13 9781835461860
Length
Edition 1st Edition
Languages
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Author (1):
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Mr. Jason Chow Mr. Jason Chow
Author Profile Icon Mr. Jason Chow
Mr. Jason Chow
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Table of Contents (18) Chapters Close

Preface 1. Chapter 1: The Essence of Software Architecture 2. Chapter 2: Principles of Software Architecture FREE CHAPTER 3. Chapter 3: Polymorphism and Alternatives 4. Chapter 4: Peer-to-Peer and Client-Server Architecture 5. Chapter 5: Exploring MVC, MVP, and MVVM 6. Chapter 6: Microservices, Serverless, and Microfrontends 7. Chapter 7: Modular and Layered Architectures 8. Chapter 8: Domain-Driven Design (DDD) 9. Chapter 9: Event Sourcing and CQRS 10. Chapter 10: Idempotency, Replication, and Recovery Models 11. Chapter 11: Auditing and Monitoring Models 12. Chapter 12: Performance and Scalability 13. Chapter 13: Testing 14. Chapter 14: Security 15. Chapter 15: Beyond Architecture 16. Index 17. Other Books You May Enjoy

Summary

We used the example of three types of services (plumbing, babysitting, and room cleaning) that households can perform for each other, focusing on the start, completion, confirmation, and checks for whether the service was performed.

We presented a solution that uses traditional polymorphism in object-oriented programming. An interface was defined and implemented by three subclasses, one for each type of service. The main function uses these subclasses in a homogeneous yet polymorphic manner.

We then used the Kotlin sealed class feature to restrict all subclasses to be known. A further variation was that the sealed class was used together with the when construct to handle all branches within the when block. It resulted in a function containing all variations of the service check behaviors suitable for a small and fixed number of subclasses in a package.

We presented an alternative solution that uses Kotlin delegation over polymorphism. We defined smaller interfaces...

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