| Data Models |
Encapsulation + Validation |
ViewModel with StateFlow rules |
Entity with JPA annotations |
| Architecture Layers |
Abstraction boundaries |
Use Cases between ViewModel and Repository |
Service interfaces between Controller and Repository |
| Testing |
Polymorphism for test doubles |
Mock repositories for unit tests |
Mock services in integration tests |
| Extensibility |
Open/Closed principle |
New repository implementations |
New strategy implementations |
| State Management |
Unidirectional data flow |
Redux/MVI with immutable state |
Event sourcing with snapshots |
| Error Handling |
Graceful degradation |
Try-catch with Result type |
Exception handling with logging |