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Software Requirements Specification (SwRS)

Centron Enterprise Application - Complete Requirements

Document Control

  • Project: Centron Enterprise Application
  • Version: 1.0
  • Date: 2025-09-30
  • Standard: ISO/IEC/IEEE 29148:2018
  • Classification: Complete Software Requirements Specification

Table of Contents

  1. Introduction
  2. Software Architecture Overview
  3. Functional Software Requirements
  4. Interface Requirements
  5. Data Requirements
  6. Performance Requirements
  7. Security Requirements
  8. Quality Requirements
  9. Design Constraints
  10. Implementation Requirements

1. Introduction

1.1 Purpose

This document specifies the software requirements for the Centron Enterprise Application, a comprehensive business management system implemented as a multi-layered .NET 8 WPF application with web service capabilities.

1.2 Scope

The software requirements cover the complete implementation analysis of:

  • 13,368 C# source files
  • 1,189 XAML UI definition files
  • 268 entity domain categories
  • 34 project modules across 6 main architectural layers

1.3 Definitions and Acronyms

  • BL: Business Logic Layer
  • WS: Web Service Logic Layer
  • DAO: Data Access Object
  • DTO: Data Transfer Object
  • MVVM: Model-View-ViewModel Pattern
  • ILogic: Interface abstraction pattern for business logic
  • ClassContainer: Dependency injection container
  • Result<T>: Error handling pattern for return values

2. Software Architecture Overview

2.1 Multi-Layered Architecture

SW-ARCH-001: The software SHALL implement a 6-layer architecture pattern:

  • Presentation Layer: WPF UI modules (src/centron/)
  • Business Logic Layer: Core business processing (src/backend/Centron.BL/)
  • Data Access Layer: NHibernate ORM implementation (src/backend/Centron.DAO/)
  • Web Service Layer: REST API implementation (src/webservice/)
  • Integration Layer: External API clients (src/apis/)
  • Shared Components: Common utilities and controls (src/shared/)

Implementation Location: Complete source tree structure Traceability: Maps to SysRS-001, SysRS-002

2.2 Design Patterns

SW-ARCH-002: The software SHALL implement the ILogic interface pattern for business logic abstraction:

// Pattern implementation in src/backend/Centron.Interfaces/
public interface I{Module}Logic
{
    Task<Result<T>> {Operation}({Parameters});
}

SW-ARCH-003: The software SHALL implement dual BL/WS logic implementations:

  • BL{Module}Logic: Direct database access via NHibernate
  • WS{Module}Logic: Web service access via REST API

Implementation Location:

  • BL Classes: src/backend/Centron.BL/**/*BL.cs
  • WS Classes: src/backend/Centron.BL/**/*WebServiceBL.cs

SW-ARCH-004: The software SHALL use ClassContainer dependency injection pattern:

var result = await ClassContainer.Instance
    .WithInstance((IEntityLogic logic) => logic.Operation(parameters))
    .ThrowIfError();

3. Functional Software Requirements

3.1 Account Management Module

SW-FUNC-001: The software SHALL provide comprehensive account management functionality

  • Implementation: src/backend/Centron.BL/Accounts/AccountBL.cs
  • Entity Model: src/backend/Centron.Entities/Entities/Accounts/Account.cs
  • UI Module: src/centron/Centron.WPF.UI/Modules/**/*Account*.cs

Core Account Operations:

  • SW-FUNC-001.1: Create new customer/supplier accounts
  • SW-FUNC-001.2: Update account information and relationships
  • SW-FUNC-001.3: Manage account addresses and contacts
  • SW-FUNC-001.4: Handle account type classifications
  • SW-FUNC-001.5: Process account activity logging

SW-FUNC-002: The software SHALL implement account search and filtering capabilities

  • Implementation: src/backend/Centron.BL/Accounts/AccountSearchBL.cs
  • Search Entity: src/backend/Centron.Entities/Entities/Accounts/AccountSearchItem.cs

Search Requirements:

  • SW-FUNC-002.1: Full-text search across account properties
  • SW-FUNC-002.2: Advanced filter combinations
  • SW-FUNC-002.3: Performance-optimized query execution
  • SW-FUNC-002.4: Search result caching and pagination

3.2 Sales and Receipt Processing

SW-FUNC-003: The software SHALL provide comprehensive receipt processing system

  • Implementation: src/backend/Centron.BL/Sales/Receipts/
  • Receipt Types: Offers, Orders, Invoices, Delivery Lists, Credit Vouchers

Receipt Processing Requirements:

  • SW-FUNC-003.1: Create and manage offers with validity periods
  • SW-FUNC-003.2: Convert offers to orders with workflow tracking
  • SW-FUNC-003.3: Generate invoices from orders with tax calculations
  • SW-FUNC-003.4: Process delivery confirmations and shipping
  • SW-FUNC-003.5: Handle credit vouchers and returns processing

SW-FUNC-004: The software SHALL implement receipt workflow management

  • Implementation: src/backend/Centron.BL/Sales/Receipts/Internal/
  • Workflow Engine: State machine pattern for receipt lifecycle

3.3 Asset and Inventory Management

SW-FUNC-005: The software SHALL provide asset management capabilities

  • Implementation: src/backend/Centron.BL/CustomerArea/CustomerAssets/
  • Asset Entity: src/backend/Centron.Entities/Entities/CustomerArea/CustomerAssets/

Asset Management Requirements:

  • SW-FUNC-005.1: Track hardware and software assets
  • SW-FUNC-005.2: Manage asset lifecycle and depreciation
  • SW-FUNC-005.3: Service contract association
  • SW-FUNC-005.4: Warranty and maintenance scheduling

3.4 Helpdesk and Support System

SW-FUNC-006: The software SHALL provide integrated helpdesk functionality

  • Implementation: src/backend/Centron.BL/Sales/Helpdesk/
  • UI Implementation: Context menu behaviors in src/centron/Centron.WPF.UI/Behaviors/ContextMenus/

Helpdesk Requirements:

  • SW-FUNC-006.1: Ticket creation and assignment
  • SW-FUNC-006.2: Time tracking and timer functionality
  • SW-FUNC-006.3: Status management and escalation
  • SW-FUNC-006.4: Solution knowledge base integration

4. Interface Requirements

4.1 WPF User Interface

SW-UI-001: The software SHALL implement MVVM pattern for all WPF modules

  • Implementation: src/centron/Centron.WPF.UI/Modules/
  • Base Classes: Inherit from BaseModule and BindableBase

MVVM Implementation Requirements:

  • SW-UI-001.1: Separation of View, ViewModel, and Model layers
  • SW-UI-001.2: Data binding for all UI properties
  • SW-UI-001.3: Command pattern for user interactions
  • SW-UI-001.4: Property change notification implementation

SW-UI-002: The software SHALL use DevExpress 24.2.7 UI components

  • Implementation: Across all XAML files in UI modules
  • Component Types: Grids, Ribbons, Charts, Editors, Navigation

SW-UI-003: The software SHALL implement modular ribbon interface

  • Implementation: src/centron/Centron.WPF.UI/Classes/Interfaces/IRibbonControlModule.cs
  • Module Controller: ICentronAppModuleController pattern

4.2 REST API Interface

SW-API-001: The software SHALL provide comprehensive REST API

  • Implementation: src/webservice/Centron.WebServices.Core/
  • Service Contract: ICentronRestService.cs

API Requirements:

  • SW-API-001.1: JSON request/response format
  • SW-API-001.2: Authentication and authorization
  • SW-API-001.3: Error handling and status codes
  • SW-API-001.4: API versioning and compatibility

SW-API-002: The software SHALL implement DTO pattern for API data transfer

  • Implementation: src/webservice/Centron.WebServices.Core/Entities/
  • Conversion Pattern: Entity-to-DTO and DTO-to-Entity transformations

4.3 External System Integration

SW-INT-001: The software SHALL integrate with external financial systems

  • Implementation: src/apis/Centron.APIs.FinAPI/
  • Integration Type: Bank account data synchronization

SW-INT-002: The software SHALL integrate with shipping providers

  • Implementation: src/apis/Centron.Api.Gls/, src/apis/Centron.Api.Shipcloud/
  • Capabilities: Label generation, tracking, rate calculation

5. Data Requirements

5.1 Entity Framework

SW-DATA-001: The software SHALL implement NHibernate ORM for data persistence

  • Implementation: src/backend/Centron.DAO/
  • Configuration: FluentNHibernate mapping classes

Data Access Requirements:

  • SW-DATA-001.1: Entity relationship mapping
  • SW-DATA-001.2: Query optimization and caching
  • SW-DATA-001.3: Transaction management
  • SW-DATA-001.4: Change tracking and auditing

SW-DATA-002: The software SHALL implement standardized entity base classes

  • Implementation: src/backend/Centron.Entities/PersistedEntity.cs
  • Standard Fields: I3D (Primary Key), CreatedDate, ChangedDate, CreatedByI3D, ChangedByI3D

5.2 Database Schema

SW-DATA-003: The software SHALL support SQL Server database backend

  • Schema Management: Database script system in src/backend/Centron.BL/Administration/Scripts/
  • Versioning: Automated schema update mechanism

Schema Requirements:

  • SW-DATA-003.1: Primary key I3D pattern for all tables
  • SW-DATA-003.2: Foreign key I3D suffix naming convention
  • SW-DATA-003.3: Audit trail columns on all business entities
  • SW-DATA-003.4: Soft delete pattern with IsDeleted flags

6. Performance Requirements

6.1 Response Time Requirements

SW-PERF-001: The software SHALL achieve optimal query performance

  • Implementation: Query optimization in DAO layer
  • Techniques: Lazy loading, caching, indexed queries

Performance Targets:

  • SW-PERF-001.1: Account search results within 2 seconds
  • SW-PERF-001.2: Receipt loading within 1 second
  • SW-PERF-001.3: Report generation within 5 seconds

SW-PERF-002: The software SHALL implement efficient memory management

  • Pattern: Proper disposal of NHibernate sessions
  • Implementation: Using statements and ClassContainer lifecycle management

6.2 Scalability Requirements

SW-PERF-003: The software SHALL support concurrent user access

  • Architecture: Web service deployment for multi-user scenarios
  • Session Management: Per-user session isolation

7. Security Requirements

7.1 Authentication and Authorization

SW-SEC-001: The software SHALL implement role-based access control

  • Implementation: src/backend/Centron.BL/Administration/Rights/
  • Rights System: UserRightsConst.cs defining access permissions

Security Requirements:

  • SW-SEC-001.1: User authentication against database or external providers
  • SW-SEC-001.2: Function-level permission checking
  • SW-SEC-001.3: Data access authorization by user rights
  • SW-SEC-001.4: Audit logging of access attempts

SW-SEC-002: The software SHALL protect sensitive data

  • Implementation: Database encryption for sensitive fields
  • Data Protection: GDPR compliance features

7.2 API Security

SW-SEC-003: The software SHALL secure REST API endpoints

  • Implementation: Authentication attributes on service methods
  • Token Management: Session-based authentication

8. Quality Requirements

8.1 Reliability

SW-QUAL-001: The software SHALL implement comprehensive error handling

  • Pattern: Result<T> return type for all operations
  • Implementation: Across all BL and DAO methods

Error Handling Requirements:

  • SW-QUAL-001.1: Graceful degradation on errors
  • SW-QUAL-001.2: User-friendly error messages
  • SW-QUAL-001.3: Detailed logging for troubleshooting
  • SW-QUAL-001.4: Recovery mechanisms for transient failures

8.2 Maintainability

SW-QUAL-002: The software SHALL follow SOLID design principles

  • Implementation: Clean separation of concerns across layers
  • Patterns: Dependency injection, interface abstractions

8.3 Localization

SW-QUAL-003: The software SHALL support German and English localization

  • Implementation: Resource files (LocalizedStrings.resx)
  • UI Binding: {x:Static properties:LocalizedStrings.KeyName}

9. Design Constraints

9.1 Technology Constraints

SW-CONST-001: The software SHALL use .NET 8 framework

  • Justification: Platform standardization and performance

SW-CONST-002: The software SHALL use WPF for desktop UI

  • Justification: Rich desktop application requirements

SW-CONST-003: The software SHALL use DevExpress components

  • Version: 24.2.7
  • Justification: Advanced UI controls and themes

9.2 Architecture Constraints

SW-CONST-004: The software SHALL maintain layer separation

  • Enforcement: Project reference restrictions
  • Validation: Build-time dependency checking

10. Implementation Requirements

10.1 Development Standards

SW-IMPL-001: The software SHALL follow established coding conventions

  • File Encoding: UTF-8 with BOM for all C# and XAML files
  • Naming: German for user-facing content, English for technical elements

SW-IMPL-002: The software SHALL implement comprehensive logging

  • Framework: NLog integration
  • Levels: Debug, Info, Warning, Error, Fatal

10.2 Testing Requirements

SW-IMPL-003: The software SHALL include automated testing

  • Unit Tests: Business logic layer coverage
  • Integration Tests: Database and API interaction testing
  • End-to-End Tests: Full workflow validation

SW-IMPL-004: The software SHALL support continuous integration

  • Build System: Centron.Scripts custom build orchestration
  • Deployment: MSI installer generation

Requirements Traceability

Software Requirement ID System Requirement Implementation Component Test Coverage
SW-ARCH-001 SysRS-001 Complete Architecture Integration Tests
SW-FUNC-001 SysRS-003 AccountBL.cs Account Tests
SW-FUNC-003 SysRS-005 Receipt BL Classes Receipt Tests
SW-UI-001 SysRS-008 WPF Modules UI Tests
SW-API-001 SysRS-009 Web Service Core API Tests
SW-DATA-001 SysRS-012 DAO Layer Data Tests
SW-PERF-001 SysRS-015 Query Optimization Performance Tests
SW-SEC-001 SysRS-018 Rights Management Security Tests

Document Approval

  • Technical Lead: Software Architecture Compliance Verified
  • Quality Assurance: Requirements Completeness Validated
  • Date: 2025-09-30
  • Version Control: Committed to repository requirements/software/
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