Configuration Guide

This guide covers all aspects of configuring SimpleMessageBus in your .NET applications, from basic setup to advanced scenarios.

Basic Configuration

Configure for ASP.NET Core

Configure SimpleMessageBus in your Program.cs file:

using SimpleMessageBus.Publish.Azure.Extensions;
using SimpleMessageBus.Dispatch.Azure.Extensions;

var builder = WebApplication.CreateBuilder(args);

// Configure publisher
builder.Services.AddSimpleMessageBusAzureStoragePublisher(options =>
{
    options.ConnectionString = builder.Configuration.GetConnectionString("AzureStorage");
    options.DefaultQueueName = "messages";
});

// Configure dispatcher
builder.Services.AddSimpleMessageBusAzureStorageDispatcher(options =>
{
    options.ConnectionString = builder.Configuration.GetConnectionString("AzureStorage");
    options.MaxConcurrentMessages = 32;
    options.PollingInterval = TimeSpan.FromSeconds(5);
});

// Register message handlers
builder.Services.AddScoped<IMessageHandler, OrderCreatedHandler>();

var app = builder.Build();
app.Run();

Configure for Console Applications

For console applications, use the generic host:

using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.DependencyInjection;

var builder = Host.CreateApplicationBuilder(args);

// Configure SimpleMessageBus
builder.Services.AddSimpleMessageBusFileSystemPublisher(options =>
{
    options.RootPath = Path.Combine(Directory.GetCurrentDirectory(), "messages");
});

builder.Services.AddSimpleMessageBusFileSystemDispatcher(options =>
{
    options.RootPath = Path.Combine(Directory.GetCurrentDirectory(), "messages");
});

// Register handlers
builder.Services.AddScoped<IMessageHandler, OrderHandler>();

var host = builder.Build();
await host.RunAsync();

Provider-Specific Configuration

Azure Storage Queue

Basic Configuration

services.AddSimpleMessageBusAzureStoragePublisher(options =>
{
    options.ConnectionString = "DefaultEndpointsProtocol=https;AccountName=...";
    options.DefaultQueueName = "messages";
    options.CreateQueuesAutomatically = true;
});

services.AddSimpleMessageBusAzureStorageDispatcher(options =>
{
    options.ConnectionString = "DefaultEndpointsProtocol=https;AccountName=...";
    options.DefaultQueueName = "messages";
    options.PollingInterval = TimeSpan.FromSeconds(5);
    options.MaxConcurrentMessages = 32;
    options.VisibilityTimeout = TimeSpan.FromMinutes(5);
});

Managed Identity

services.AddSimpleMessageBusAzureStoragePublisher(options =>
{
    options.AccountName = "mystorageaccount";
    // No connection string - uses managed identity
    options.DefaultQueueName = "messages";
});

Custom Queue Naming

services.AddSingleton<IQueueNameResolver, CustomQueueNameResolver>();

public class CustomQueueNameResolver : IQueueNameResolver
{
    public string ResolveQueueName<T>(T message) where T : IMessage
    {
        return $"{typeof(T).Name.ToLowerInvariant()}-queue";
    }
}

Amazon SQS

Access Key Configuration

services.AddSimpleMessageBusAmazonSQSPublisher(options =>
{
    options.Region = "us-east-1";
    options.AccessKey = "AKIAIOSFODNN7EXAMPLE";
    options.SecretKey = "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY";
    options.DefaultQueueName = "messages";
});

IAM Role Configuration

services.AddSimpleMessageBusAmazonSQSPublisher(options =>
{
    options.Region = "us-east-1";
    options.UseInstanceProfile = true; // Use attached IAM role
    options.DefaultQueueName = "messages";
});

FIFO Queue Configuration

services.AddSimpleMessageBusAmazonSQSPublisher(options =>
{
    options.DefaultQueueName = "messages.fifo";
    options.UseFifoQueues = true;
    options.MessageGroupId = "default";
    options.ContentBasedDeduplication = true;
});

File System

Basic Configuration

services.AddSimpleMessageBusFileSystemPublisher(options =>
{
    options.RootPath = @"C:\MessageQueue";
    options.CreateDirectoriesAutomatically = true;
});

services.AddSimpleMessageBusFileSystemDispatcher(options =>
{
    options.RootPath = @"C:\MessageQueue";
    options.PollingInterval = TimeSpan.FromSeconds(1);
    options.ProcessedDirectory = "processed";
    options.ErrorDirectory = "errors";
});

Azure Functions Integration

[FunctionName("ProcessMessage")]
public async Task ProcessFileMessage(
    [SimpleMessageBusFileTrigger("messages")] MessageEnvelope envelope,
    ILogger log)
{
    await _dispatcher.Dispatch(envelope);
}

IndexedDB (Blazor WebAssembly)

// Program.cs in Blazor WebAssembly
builder.Services.AddSimpleMessageBusIndexedDbPublisher(options =>
{
    options.DatabaseName = "MessageBusDB";
    options.DatabaseVersion = 1;
});

builder.Services.AddSimpleMessageBusIndexedDbDispatcher(options =>
{
    options.DatabaseName = "MessageBusDB";
    options.PollingInterval = TimeSpan.FromSeconds(2);
});

Environment-Based Configuration

By Environment
With Feature Flags

Configure different providers for different environments:

var builder = WebApplication.CreateBuilder(args);

if (builder.Environment.IsDevelopment())
{
    // Use file system in development
    builder.Services.AddSimpleMessageBusFileSystemPublisher(options =>
    {
        options.RootPath = Path.Combine(Directory.GetCurrentDirectory(), "dev-messages");
    });

    builder.Services.AddSimpleMessageBusFileSystemDispatcher(options =>
    {
        options.RootPath = Path.Combine(Directory.GetCurrentDirectory(), "dev-messages");
        options.PollingInterval = TimeSpan.FromSeconds(1);
    });
}
else if (builder.Environment.IsStaging())
{
    // Use Azure Storage in staging
    builder.Services.AddSimpleMessageBusAzureStoragePublisher(options =>
    {
        options.ConnectionString = builder.Configuration.GetConnectionString("StagingStorage");
        options.DefaultQueueName = "staging-messages";
    });

    builder.Services.AddSimpleMessageBusAzureStorageDispatcher(options =>
    {
        options.ConnectionString = builder.Configuration.GetConnectionString("StagingStorage");
        options.DefaultQueueName = "staging-messages";
    });
}
else // Production
{
    // Use Amazon SQS in production
    builder.Services.AddSimpleMessageBusAmazonSQSPublisher(options =>
    {
        options.Region = builder.Configuration["AWS:Region"];
        options.UseInstanceProfile = true;
        options.DefaultQueueName = "production-messages";
    });

    builder.Services.AddSimpleMessageBusAmazonSQSDispatcher(options =>
    {
        options.Region = builder.Configuration["AWS:Region"];
        options.UseInstanceProfile = true;
        options.DefaultQueueName = "production-messages";
    });
}

Use feature flags to control provider selection:

var useAmazonSQS = builder.Configuration.GetValue<bool>("Features:UseAmazonSQS");
var useHighThroughput = builder.Configuration.GetValue<bool>("Features:HighThroughput");

if (useAmazonSQS)
{
    builder.Services.AddSimpleMessageBusAmazonSQSPublisher(options =>
    {
        builder.Configuration.GetSection("AmazonSQS").Bind(options);
    });
}
else
{
    builder.Services.AddSimpleMessageBusAzureStoragePublisher(options =>
    {
        builder.Configuration.GetSection("AzureStorage").Bind(options);
    });
}

// Adjust concurrency based on feature flag
builder.Services.Configure<DispatcherOptions>(options =>
{
    options.MaxConcurrentMessages = useHighThroughput ? 64 : 16;
});

Message Handler Registration

Manual Registration
Assembly Scanning
Conditional Registration

// Register individual handlers
services.AddScoped<IMessageHandler, OrderCreatedHandler>();
services.AddScoped<IMessageHandler, PaymentProcessedHandler>();
services.AddScoped<IMessageHandler, InventoryReservedHandler>();

Best for: Small projects with few handlers.

Automatically discover and register handlers:

// Register all handlers from current assembly
services.Scan(scan => scan
    .FromAssemblyOf<OrderCreatedHandler>()
    .AddClasses(classes => classes.AssignableTo<IMessageHandler>())
    .As<IMessageHandler>()
    .WithScopedLifetime());

// Register handlers from multiple assemblies
services.Scan(scan => scan
    .FromAssemblies(
        Assembly.GetExecutingAssembly(),
        Assembly.GetAssembly(typeof(ExternalHandler)))
    .AddClasses(classes => classes.AssignableTo<IMessageHandler>())
    .As<IMessageHandler>()
    .WithScopedLifetime());

Best for: Large projects with many handlers.

// Register handlers based on configuration
if (builder.Configuration.GetValue<bool>("Features:OrderProcessing"))
{
    services.AddScoped<IMessageHandler, OrderCreatedHandler>();
    services.AddScoped<IMessageHandler, OrderCancelledHandler>();
}

if (builder.Configuration.GetValue<bool>("Features:PaymentProcessing"))
{
    services.AddScoped<IMessageHandler, PaymentProcessedHandler>();
    services.AddScoped<IMessageHandler, PaymentFailedHandler>();
}

Best for: Feature flag-based deployments.

Advanced Configuration

Multiple Providers

Use different providers for different message types:

// Configure multiple publishers with names
services.AddSimpleMessageBusAzureStoragePublisher("orders", options =>
{
    options.ConnectionString = azureConnectionString;
    options.DefaultQueueName = "orders";
});

services.AddSimpleMessageBusAmazonSQSPublisher("payments", options =>
{
    options.Region = "us-east-1";
    options.UseInstanceProfile = true;
    options.DefaultQueueName = "payments";
});

// Use named publishers
public class OrderService
{
    private readonly IMessagePublisher _orderPublisher;
    private readonly IMessagePublisher _paymentPublisher;

    public OrderService(
        [FromKeyedServices("orders")] IMessagePublisher orderPublisher,
        [FromKeyedServices("payments")] IMessagePublisher paymentPublisher)
    {
        _orderPublisher = orderPublisher;
        _paymentPublisher = paymentPublisher;
    }

    public async Task ProcessOrderAsync(Order order)
    {
        await _orderPublisher.PublishAsync(new OrderCreatedMessage { ... });
        await _paymentPublisher.PublishAsync(new ProcessPaymentMessage { ... });
    }
}

Custom Dispatcher Configuration

Configure message dispatching behavior:

// Parallel dispatcher (default)
services.AddSimpleMessageBusParallelDispatcher(options =>
{
    options.MaxConcurrency = Environment.ProcessorCount * 2;
    options.BatchSize = 10;
});

// Ordered dispatcher
services.AddSimpleMessageBusOrderedDispatcher();

// Custom dispatcher
services.AddScoped<IMessageDispatcher, CustomMessageDispatcher>();

Serialization Configuration

Customize JSON serialization:

services.Configure<JsonSerializerOptions>(options =>
{
    options.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
    options.WriteIndented = true;
    options.Converters.Add(new JsonStringEnumConverter());
});

// Or configure per provider
services.AddSimpleMessageBusAzureStoragePublisher(options =>
{
    options.SerializerOptions = new JsonSerializerOptions
    {
        PropertyNamingPolicy = JsonNamingPolicy.CamelCase
    };
});

Configuration Best Practices

1. Use Configuration Sections

Organize configuration in appsettings.json:

{
  "SimpleMessageBus": {
    "Azure": {
      "ConnectionString": "DefaultEndpointsProtocol=https;...",
      "DefaultQueueName": "messages",
      "MaxConcurrentMessages": 32,
      "PollingInterval": "00:00:05"
    },
    "Amazon": {
      "Region": "us-east-1",
      "DefaultQueueName": "messages",
      "UseFifoQueues": false,
      "WaitTimeSeconds": 20
    }
  }
}

services.AddSimpleMessageBusAzureStoragePublisher(options =>
{
    builder.Configuration.GetSection("SimpleMessageBus:Azure").Bind(options);
});

2. Environment-Specific Settings

Use different configuration files per environment:

// appsettings.Development.json
{
  "SimpleMessageBus": {
    "Provider": "FileSystem",
    "FileSystem": {
      "RootPath": "./dev-messages",
      "PollingInterval": "00:00:01"
    }
  }
}

// appsettings.Production.json
{
  "SimpleMessageBus": {
    "Provider": "AmazonSQS",
    "Amazon": {
      "Region": "us-east-1",
      "UseInstanceProfile": true,
      "WaitTimeSeconds": 20
    }
  }
}

3. Secure Configuration

Store sensitive values in Azure Key Vault or AWS Secrets Manager:

// Azure Key Vault
builder.Configuration.AddAzureKeyVault(
    vaultUri: "https://myvault.vault.azure.net/",
    credential: new DefaultAzureCredential());

// AWS Secrets Manager
builder.Configuration.AddSecretsManager(region: RegionEndpoint.USEast1);

// Use in configuration
services.AddSimpleMessageBusAzureStoragePublisher(options =>
{
    options.ConnectionString = builder.Configuration["SimpleMessageBus:ConnectionString"];
});

4. Configuration Validation

Validate configuration at startup:

services.Configure<AzureStorageOptions>(
    builder.Configuration.GetSection("SimpleMessageBus:Azure"));

services.AddOptions<AzureStorageOptions>()
    .Configure(builder.Configuration.GetSection("SimpleMessageBus:Azure"))
    .ValidateDataAnnotations()
    .ValidateOnStart();

public class AzureStorageOptions
{
    [Required]
    public string ConnectionString { get; set; }
    
    [Required]
    [RegularExpression(@"^[a-z0-9-]+$")]
    public string DefaultQueueName { get; set; }
    
    [Range(1, 32)]
    public int MaxConcurrentMessages { get; set; } = 16;
}

Monitoring and Observability Configuration

Logging

Configure structured logging:

builder.Services.AddLogging(logging =>
{
    logging.ClearProviders();
    logging.AddConsole();
    logging.AddApplicationInsights();
    
    // Filter SimpleMessageBus logs
    logging.AddFilter("SimpleMessageBus", LogLevel.Information);
});

Metrics

Configure metrics collection:

builder.Services.AddMetrics();

// Custom metrics
services.AddSingleton<IMetrics>(provider =>
{
    var factory = provider.GetRequiredService<IMeterFactory>();
    return factory.Create("SimpleMessageBus.Application");
});

Health Checks

Add health checks for message bus components:

services.AddHealthChecks()
    .AddCheck<MessageBusHealthCheck>("messagebus")
    .AddAzureQueueStorage(connectionString, "messages")
    .AddSqs(options => { ... });

Testing Configuration

Integration Tests

Configure for integration testing:

public class TestStartup
{
    public void ConfigureServices(IServiceCollection services)
    {
        // Use in-memory provider for tests
        services.AddSimpleMessageBusInMemoryProvider();
        
        // Or use test containers
        services.AddSimpleMessageBusAzureStoragePublisher(options =>
        {
            options.ConnectionString = "UseDevelopmentStorage=true";
        });
    }
}

Unit Tests

Mock configuration for unit tests:

[Test]
public void Configure_WithValidOptions_RegistersServices()
{
    var services = new ServiceCollection();
    var configuration = new ConfigurationBuilder()
        .AddInMemoryCollection(new Dictionary<string, string>
        {
            ["ConnectionString"] = "UseDevelopmentStorage=true",
            ["DefaultQueueName"] = "test-queue"
        })
        .Build();

    services.AddSimpleMessageBusAzureStoragePublisher(options =>
    {
        configuration.Bind(options);
    });

    var provider = services.BuildServiceProvider();
    var publisher = provider.GetService<IMessagePublisher>();
    
    Assert.That(publisher, Is.Not.Null);
}

Troubleshooting Configuration Issues

Connection String Issues

Problem: Authentication failures or connection errorsSolutions:

Verify connection string format
Check account credentials
Ensure network connectivity
Validate queue/storage account exists

// Test connection at startup
services.AddHealthChecks()
    .AddAzureQueueStorage(connectionString);

Handler Registration Problems

Problem: Handlers not receiving messagesSolutions:

Verify handler implements IMessageHandler
Check GetHandledMessageTypes() returns correct types
Ensure handler is registered in DI container
Verify message type matches exactly

// Debug handler registration
var handlers = serviceProvider.GetServices<IMessageHandler>();
foreach (var handler in handlers)
{
    var types = handler.GetHandledMessageTypes();
    Console.WriteLine($"Handler {handler.GetType().Name} handles: {string.Join(", ", types.Select(t => t.Name))}");
}

Performance Issues

Problem: Slow message processingSolutions:

Increase MaxConcurrentMessages
Reduce PollingInterval
Optimize handler performance
Consider batch processing

// Performance-optimized configuration
options.MaxConcurrentMessages = Environment.ProcessorCount * 4;
options.PollingInterval = TimeSpan.FromSeconds(1);
options.BatchSize = 32;

Next Steps

Testing Guide

Learn how to test your configuration

Error Handling

Implement robust error handling

Performance Guide

Optimize for production workloads

Provider Guides

Deep dive into specific providers

Getting Started

Guides

Providers

API Reference

Configuration Guide

Basic Configuration

Provider-Specific Configuration

Azure Storage Queue

Amazon SQS

File System

IndexedDB (Blazor WebAssembly)

Environment-Based Configuration

Message Handler Registration

Advanced Configuration

Multiple Providers

Custom Dispatcher Configuration

Serialization Configuration

Configuration Best Practices

1. Use Configuration Sections

2. Environment-Specific Settings

3. Secure Configuration

4. Configuration Validation

Monitoring and Observability Configuration

Logging

Metrics

Health Checks

Testing Configuration

Integration Tests

Unit Tests

Troubleshooting Configuration Issues

Next Steps

Testing Guide

Error Handling

Performance Guide

Provider Guides

​Basic Configuration

​Provider-Specific Configuration

​Azure Storage Queue

​Amazon SQS

​File System

​IndexedDB (Blazor WebAssembly)

​Environment-Based Configuration

​Message Handler Registration

​Advanced Configuration

​Multiple Providers

​Custom Dispatcher Configuration

​Serialization Configuration

​Configuration Best Practices

​1. Use Configuration Sections

​2. Environment-Specific Settings

​3. Secure Configuration

​4. Configuration Validation

​Monitoring and Observability Configuration

​Logging

​Metrics

​Health Checks

​Testing Configuration

​Integration Tests

​Unit Tests

​Troubleshooting Configuration Issues

​Next Steps

Testing Guide

Error Handling

Performance Guide

Provider Guides

Basic Configuration

Provider-Specific Configuration

Azure Storage Queue

Amazon SQS

File System

IndexedDB (Blazor WebAssembly)

Environment-Based Configuration

Message Handler Registration

Advanced Configuration

Multiple Providers

Custom Dispatcher Configuration

Serialization Configuration

Configuration Best Practices

1. Use Configuration Sections

2. Environment-Specific Settings

3. Secure Configuration

4. Configuration Validation

Monitoring and Observability Configuration

Logging

Metrics

Health Checks

Testing Configuration

Integration Tests

Unit Tests

Troubleshooting Configuration Issues

Next Steps