Design Patterns

Implementation patterns and best practices used throughout the StockEase application.

Overview

This section documents the design patterns employed in the application to solve common problems and ensure code quality, maintainability, and scalability.

Patterns

Repository Pattern

Implementation of the Repository pattern for data access abstraction and testability.

Security Patterns

Security-related patterns and approaches used for authentication, authorization, and data protection.

Pattern Categories

Behavioral Patterns

Repository Pattern
Security Patterns
Service Layer Pattern
DTO Pattern

Structural Patterns

Layered Architecture
Dependency Injection
Aspect-Oriented Programming (AOP)

Concurrency Patterns

Database Transaction Management
Optimistic Locking
Cache Invalidation

Pattern Selection Criteria

When selecting patterns for the application: 1. Problem Domain: Does it solve our specific problem? 2. Maintainability: Will it make the code easier to maintain? 3. Testability: Does it improve testability? 4. Performance: What are the performance implications? 5. Learning Curve: How complex is it for the team?

Implementation Guidelines

Each pattern includes: - Intent: What problem does it solve? - Participants: Classes/components involved - Collaboration: How components interact - Consequences: Advantages and disadvantages - Code Examples: Real examples from StockEase - Related Patterns: Other relevant patterns

For more information, see: - Architecture Overview - Backend Architecture - Components Documentation - Design Decisions