Hexagonal architecture for java applications
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• RESTful API with Spring Boot
• Securing REST APIs
• References:
[1] alistair.cockburn.us/Hexagonal+architecture
[2] www.infoq.com/news/2013/08/hexagonal-lifepreserver-spring
[3] github.com/russmiles/life-preserver-introductory-article-developer-magazine/
blob/master/README.md
[4] github.com/spring-guides/deprecate-tut-rest
[5] blog.ploeh.dk/2013/12/03/layers-onions-ports-adapters-its-all-the-same
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Hexagonal architecture for java applications
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Workshop Guide for Java Hexagonal Applications using Spring Boot
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Hexagonal architecture for java applications
- 1. Java Development HEXAGONAL ARCHITECTURE for Java Applications
- 3. 01 What drives the software architecture? • High Maintainability • Low Technical Debt: The cost payed by bad decisions • Lack of understanding • Lack of tests • Lack of documentation • Lack of collaboration • Lack of process
- 4. 01 Common multi-layer architecture ! " # " ! UI Layer " Application Layer # Data " Crosscutting Dependency
- 5. 01 Multi-tier architecture Web Application Tier ! ! " " " # # # " " " ! " Client Tier Browsers, Frontend App Mobile devices, PC$Q % ! + Data / Integration Tier Database, File Storage, External Systems, Cloud & ERP CRM DOCs Dependency
- 6. 01 Dependency inversion principle Reference: http://blog.ploeh.dk/2013/12/03/layers-onions-ports-adapters-its-all-the-same Dependency DANGER - Possible business logic leaks
- 8. 02 Intent • Alternative names • Ports & Adapters • Onion Architecture / Onion Layers “Allow an application to equally be driven by users, programs, automated test or batch scripts, and to be developed and tested in isolation from its eventual run- time devices and databases.” Alistair Cockburn
- 9. 02 Key Concepts Ports are interfaces Adapters are implementations
- 10. The big picture: Ports & Adapters02 "Application Port Port Port Mock DB DB Integration Test Agent UI Adapter Adapter Adapter Adapter Use Case Boundary ‘’driven’’ adapters ‘’driver’’ adapters
- 11. Overview02 In-Memory "Application # Database ( Web Services ) ) Enterprise Integration * SQL Server REST Adapter * Configuration + Test Agent ! HTML5 App Environment Adapter File Source Adapter , SQL Adapter # NoSQL Adapter - MQ Service MQ Adapter . . Messaging Queue &ERP CRM DOCs EI Adapter (SOAP Adapter TEST Adapter
- 12. 03 Application Keeping it simple
- 13. 03 • Organizing Concerns and Code with Domains • Well defined boundaries between domains • Simple event-driven components • Life Preserver diagram Life preserver approach by Russ Miles
- 14. Life Preserver diagram03 Integration Core Domain Event Service Domain Boundary
- 15. Notes03 • Core • Single purpose • Focus on unit testing • No side-effects • Integration • Side effects
- 17. Kick-off04 github.com/fabricioepa/lab- springboot-rest-sample Lets start from the sample project and then create the ports and adapters
- 18. 05 Core Use Case as service
- 19. Implementing the Use Case as Service05 • Domain model • Entities • Repositories • Well defined interface • Input/Output Events • Event Handlers & Translators • Service composition • Unit Testing
- 21. 06 Controllers
- 22. Implementing passive controllers • Dummy service invokers • Do not perform multiple service calls • It does not make any workflow decision • REST Domain translator 0305 • UC • Service • Services • Domain • Controller REST Domain 06
- 24. 07 Configuration
- 25. Externalized configuration • External files • Environment variables • Configuration profiles • Services 030507
- 27. Comments • How many ports? • The hexagon is a metaphor • Abstractions • Use Case as port • Module as port: Notification, Administration, Public API, Database 0303 • Services
- 28. See more… • RESTful API with Spring Boot • Securing REST APIs • References: [1] alistair.cockburn.us/Hexagonal+architecture [2] www.infoq.com/news/2013/08/hexagonal-lifepreserver-spring [3] github.com/russmiles/life-preserver-introductory-article-developer-magazine/ blob/master/README.md [4] github.com/spring-guides/deprecate-tut-rest [5] blog.ploeh.dk/2013/12/03/layers-onions-ports-adapters-its-all-the-same / fabricioepa.wordpress.com
- 29. Contact FABRICIO EPAMINONDAS 0 linkedin.com/in/fabricioepa / fabricioepa.wordpress.com 1 @fabricioepa