Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Karumi Dojo: Kata ContactsPedro Vicente Gómez SánchezSenior Mobile Developer at Karumi

pedro@karumi.com@pedro_g_sgithub.com/pedrovgs

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Sergio GutierrezSenior Mobile Developer

Alberto GrageraTechnical Director

Jorge BarrosoGoogle Developer Expert

Davide MendoliaSenior Full Stack Engineer

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Karumi Dojo● We are here to practice and learn.

● This exercise is meant to be collaborative, not competitive.

● Try to open your mind to new concepts.

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Karumi Dojo● We are here to practice architecture.

● Keep always in mind the S.O.L.I.D principles.

● We are going to practice pair programming.

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Clean Architecture

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Clean Architecture Principles

● Separation of concerns using layers.

● Independent of Framework or third party libraries.

● Testable.

● Independent of UI or Database.

● The Dependency Rule.

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Clean Architecture Principles

● Entities representing enterprise business rules.

● Use cases of the software.

● Adapters to be decoupled from boundaries.

● Platform/Framework as a delivery mechanism.

● Data mapping.

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Clean Architecture Conclusion

“Conforming to these simple rules is not hard, and will save you a lot of headaches going forward. By separating the software into layers, and conforming to The Dependency Rule, you will create a system that is intrinsically testable, with all the benefits that implies. When any of the external parts of the system become obsolete, like the database, or the web framework, you can replace those obsolete elements with a minimum of fuss.” - Robert C. Martin

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Clean Architecture Karumi Style

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Clean Architecture Karumi Style

● Model View Presenter and Presentation Models.

● Use cases

● Repositories to abstract the data origin.

● Adapters to abstract third party libraries.

● Data mapping.

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Time to practice!!!

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Rules:● Do not start coding until you understand the requirements.

● Do not start coding without thinking in the most important part of the domain.

● Today your notebook is more important than your laptop.

● Think carefully the patterns and responsibilities associated to every class.

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Tips● Baby steps.

● Think before to code.

● Write always testable code.

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Kata Contacts● Command line application to handle your agenda.

● All the data is local but in the future will consume an external API.

● The user can add a contact.

● The user can list all the contacts already added.

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Are you ready?

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Business Requirements

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Entities

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Data Storage

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Use Cases

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

User Interface

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Changing Requirements

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Testing

Pedro V. Gómez Sánchez - pedro@karumi.com - @pedro_g_s - github.com/pedrovgs

Resources

● The Clean Architecture - Robert C. Martin

● Kata Contacts - Karumi

● Rosie - Karumi