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Service Layer
Overview
The Service Layer contains all business logic and orchestrates operations across the application. Services handle transaction management, complex validation, exception translation, data transformation, and cross-cutting concerns. This layer acts as the core of business intelligence, translating domain requirements into executable operations.
Location:
src/main/java/com/smartsupplypro/inventory/service/
Responsibility: Business logic execution, transaction boundaries, validation orchestration, exception translation
Architecture
HTTP Requests"] ServiceInterface["Service Interface
Contract Definition"] ServiceImpl["Service Implementation
Business Logic"] Validation["Validation Layer
Business Rules"] Repository["Repository Layer
Data Access"] Exception["Exception Handling
Domain → HTTP"] Mapper["Data Mapper
DTO ↔ Entity"] Audit["Audit Service
Change Tracking"] Controller -->|Call| ServiceInterface ServiceInterface -->|Implements| ServiceImpl ServiceImpl --> Validation ServiceImpl --> Repository ServiceImpl --> Mapper ServiceImpl --> Audit ServiceImpl -->|Throws| Exception Exception -->|Translated| Controller style Controller fill:#42a5f5 style ServiceInterface fill:#42a5f5 style ServiceImpl fill:#2196f3 style Validation fill:#1976d2 style Repository fill:#1565c0 style Exception fill:#ef9a9a style Mapper fill:#a5d6a7 style Audit fill:#a5d6a7
Quick Navigation
By Topic
- Core Services - Supplier, InventoryItem, StockHistory, Analytics
- Service Patterns - DI, Transactions, Exception Translation, DTOs, Validation, Audit
- Interaction Diagram - Service operation flow visualization
- Cross-Cutting Concerns - Exception handling, logging strategies
- Testing - Unit test patterns with Mockito
- Integration - Interaction with other layers
- Best Practices - Service design guidelines
By Role
- Developers → Start with Core Services and Service Patterns
- QA/Testers → See Testing for test patterns
- Architects → Review Integration for layer design
- DevOps → Check Cross-Cutting Concerns for logging/monitoring
- Code Reviewers → Use Best Practices as checklist
Core Services Overview
The service layer includes four primary services:
- SupplierService - Manage supplier lifecycle (create, read, update, delete)
- InventoryItemService - Manage inventory items with integrated stock tracking
- StockHistoryService - Log and query stock movement audit trail
- AnalyticsService - Provide business intelligence and financial analysis
See supplier-service.md for detailed documentation of each service.
Service Patterns
Services use consistent patterns for dependency injection, transaction management, exception translation, and data transformation.
See Service Patterns for detailed documentation: - Dependency Injection - Transaction Management - Exception Translation - Data Transformation - Validation Strategy - Audit Logging