Zooper.Octopus is a lightweight .NET library that simplifies the implementation of Hexagonal Architecture (Ports and Adapters) pattern in your applications. It provides a clean and intuitive way to define ports and automatically register their adapters in your dependency injection container.

• Clean Architecture: Implements the Hexagonal Architecture pattern with clear separation of concerns
• Ports and Adapters: Provides a clear way to define ports and their implementations
• Dependency Injection: Automatic registration of adapters in your DI container
• Flexible Scanning: Multiple ways to scan and register adapters from different assemblies
• Minimal Dependencies: Only depends on Microsoft.Extensions.DependencyInjection and Scrutor
• Type-safe: Leverages C#'s type system for robust port definitions
• Testable: Designed with testability in mind from the ground up

dotnet add package Zooper.Octopus

Here's a basic example of implementing Hexagonal Architecture with Zooper.Octopus:

// Define your port (in your core/domain layer)
public interface IUserRepository : IPort
{
    Task<User?> GetByIdAsync(Guid id);
    Task SaveAsync(User user);
}

// Implement your adapter (in your infrastructure layer)
public class SqlUserRepository : IUserRepository
{
    private readonly DbContext _dbContext;

    public SqlUserRepository(DbContext dbContext)
    {
        _dbContext = dbContext;
    }

    public async Task<User?> GetByIdAsync(Guid id)
    {
        return await _dbContext.Users.FindAsync(id);
    }

    public async Task SaveAsync(User user)
    {
        _dbContext.Users.Update(user);
        await _dbContext.SaveChangesAsync();
    }
}

// Register adapters in your composition root
public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        // Register all adapters from the current assembly
        services.RegisterAdapters();

        // Or register adapters from specific assemblies
        services.RegisterAdapters(typeof(SqlUserRepository).Assembly);

        // Or register adapters from multiple assemblies
        services.RegisterAdapters(
            typeof(SqlUserRepository).Assembly,
            typeof(AnotherAdapter).Assembly
        );
    }
}

Ports are interfaces that define the boundaries of your application. They represent the contracts that your application core expects to be fulfilled:

public interface IEmailService : IPort
{
    Task SendEmailAsync(string to, string subject, string body);
}

Adapters are the implementations of ports. They live in the infrastructure layer and provide the actual functionality:

public class SmtpEmailService : IEmailService
{
    private readonly SmtpClient _smtpClient;

    public SmtpEmailService(SmtpClient smtpClient)
    {
        _smtpClient = smtpClient;
    }

    public async Task SendEmailAsync(string to, string subject, string body)
    {
        var message = new MailMessage("[email protected]", to, subject, body);
        await _smtpClient.SendMailAsync(message);
    }
}

Zooper.Octopus provides several ways to register your adapters:

// Register all adapters from application dependencies
services.RegisterAdapters();

// Register adapters from a specific assembly
services.RegisterAdapters(typeof(SqlUserRepository).Assembly);

// Register adapters from multiple assemblies
services.RegisterAdapters(
    typeof(SqlUserRepository).Assembly,
    typeof(SmtpEmailService).Assembly
);

// Register adapters from the assembly containing a specific type
services.RegisterAdapters<SqlUserRepository>();

1. Keep Ports Focused: Each port should have a single responsibility
2. Use Meaningful Names: Port names should clearly indicate their purpose
3. Define Clear Contracts: Port interfaces should be well-defined and stable

1. Keep Adapters Simple: Adapters should focus on implementing the port contract
2. Handle Dependencies: Use constructor injection for dependencies
3. Implement Error Handling: Adapters should handle errors appropriately

1. Test Ports Independently: Test ports without their adapters
2. Mock Adapters: Use mocks for testing the application core
3. Test Adapters in Isolation: Test adapters with their specific dependencies

Check out the Zooper.Octopus.Examples project for comprehensive examples including:

• User management system
• Email notification service
• File storage system
• Different adapter implementations

Contributions are welcome! Please feel free to submit a Pull Request.

This project is licensed under the MIT License - see the LICENSE file for details.

• Zooper.Bee - Fluent workflow framework
• Zooper.Fox - Functional programming primitives