DKNet

Service Layer

The Service Layer provides application services and cross-cutting concerns that support business operations while maintaining clear separation from domain logic. These services implement the application layer patterns in the Onion Architecture.

Components

Blob Storage Services

Data Processing Services

Architecture Role in DDD & Onion Architecture

The Service Layer implements the Application Layer in the Onion Architecture, orchestrating business operations and providing external integrations:

┌─────────────────────────────────────────────────────────────────┐
│                    🌐 Presentation Layer                        │
│                   (Controllers, API Endpoints)                  │
│                                                                 │
│  Uses: Application services for file uploads, data processing  │
└─────────────────────────┬───────────────────────────────────────┘
                          │
┌─────────────────────────┴───────────────────────────────────────┐
│                   🎯 Application Layer                          │
│              (Use Cases, Application Services)                  │
│                                                                 │
│  🔧 DKNet.Svc.BlobStorage.* - File storage operations          │
│  📊 DKNet.Svc.Transformation - Data processing pipelines       │
│  🎭 Orchestrates domain operations with external services      │
└─────────────────────────┬───────────────────────────────────────┘
                          │
┌─────────────────────────┴───────────────────────────────────────┐
│                    💼 Domain Layer                             │
│           (Entities, Aggregates, Domain Services)              │
│                                                                 │
│  No direct dependencies on service implementations             │
│  May define service contracts/interfaces                       │
└─────────────────────────┬───────────────────────────────────────┘
                          │
┌─────────────────────────┴───────────────────────────────────────┐
│                 🗄️ Infrastructure Layer                        │
│                  (Data Access, External APIs)                  │
│                                                                 │
│  Implements: Concrete service implementations                  │
│  Integrates: AWS S3, Azure Storage, Local file system         │
└─────────────────────────────────────────────────────────────────┘

Key Design Patterns Implemented

1. Provider Pattern

2. Adapter Pattern

3. Strategy Pattern

4. Façade Pattern

DDD Implementation Benefits

1. Application Services

2. Technology Independence

3. Cross-Cutting Concerns

4. Integration Patterns

Onion Architecture Benefits

1. Dependency Inversion

2. Separation of Concerns

3. Testability

4. Flexibility

Service Categories

1. File Storage Services

2. Data Transformation Services

3. Cross-Cutting Services

Integration Patterns

1. Domain Event Integration

public class DocumentProcessingService
{
    public async Task ProcessDocumentAsync(DocumentUploadedEvent evt)
    {
        // Save document using blob service
        var location = await _blobService.SaveAsync(evt.DocumentData);
        
        // Transform document data
        var transformedData = await _transformationService.ProcessAsync(evt.Metadata);
        
        // Update domain entity
        var document = await _documentRepository.GetByIdAsync(evt.DocumentId);
        document.SetProcessingComplete(location, transformedData);
    }
}

2. Multi-Provider Configuration

public void ConfigureServices(IServiceCollection services)
{
    // Configure multiple storage providers
    services.Configure<BlobServiceOptions>("AWS", options => {
        options.Provider = "S3";
        options.ConnectionString = awsConfig;
    });
    
    services.Configure<BlobServiceOptions>("Azure", options => {
        options.Provider = "AzureBlob";
        options.ConnectionString = azureConfig;
    });
    
    // Register provider factory
    services.AddSingleton<IBlobServiceFactory, BlobServiceFactory>();
}

3. Pipeline Processing

public class DataProcessingPipeline
{
    public async Task<ProcessedData> ProcessAsync(RawData input)
    {
        return await _transformationService
            .ExtractTokens(input)
            .ValidateTokens()
            .ResolveTokens()
            .FormatOutput()
            .ExecuteAsync();
    }
}

Performance & Scalability Features

Security Features

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