C4 Architecture Documentation Skill
Purpose
Document CIA platform architecture using C4 model for different abstraction levels.
When to Use
- ✅ Documenting system architecture
- ✅ Onboarding new developers
- ✅ Architecture decision records
- ✅ Security architecture reviews
C4 Model Levels
Level 1: System Context
[External Users] --uses--> [CIA Platform] --uses--> [Riksdagen API]
[CIA Platform] --uses--> [World Bank API]
[CIA Platform] --uses--> [PostgreSQL Database]
Level 2: Container Diagram
[Web Browser] --HTTPS--> [Spring MVC App] --JDBC--> [PostgreSQL]
[Spring MVC App] --HTTPS--> [External APIs]
[Spring MVC App] --uses--> [Redis Cache]
Level 3: Component Diagram
// Service Layer Components
@Component PoliticianService --uses--> @Repository PoliticianRepository
@Component VotingAnalysisService --uses--> @Repository VotingRecordRepository
@Component RiksdagenClient --calls--> [External Riksdagen API]
Level 4: Code
// Detailed class design
public class PoliticianService {
private final PoliticianRepository repository;
private final RiksdagenClient riksdagenClient;
// Implementation details...
}
PlantUML Diagrams
@startuml
!include https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/master/C4_Container.puml
Person(user, "Citizen", "Wants political transparency")
System_Boundary(cia, "CIA Platform") {
Container(web, "Web Application", "Spring MVC, Vaadin 8", "Provides UI")
ContainerDb(db, "Database", "PostgreSQL", "Stores data")
}
System_Ext(riksdagen, "Riksdagen API", "Government data")
Rel(user, web, "Uses", "HTTPS")
Rel(web, db, "Reads/Writes", "JDBC")
Rel(web, riksdagen, "Fetches data", "HTTPS/REST")
@enduml
References
- C4 Model: https://c4model.com/
- ARCHITECTURE.md
- FUTURE_ARCHITECTURE.md
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