NanoBus.Core 0.0.1

NanoBus.Core

A lightweight, thread-safe, in-memory event bus for .NET — designed for simplicity, minimal overhead, and zero dependencies.

NanoBus allows decoupled communication between components in your application through an intuitive publish/subscribe model.

🚀 Features

• In-memory & dependency-free — no external libraries required.
• Thread-safe using ConcurrentDictionary and minimal locking.
• Fluent API for clean and expressive subscriptions.
• Automatic subscription cleanup via Dispose().
• Tiny footprint — a few hundred lines of well-documented C# code.

📦 Installation

You can include this in your project manually or via a NuGet package (if you publish it):

dotnet add package NanoBus.Core

Or clone and reference it locally:

git clone https://github.com/yourusername/NanoBus.Core.git

💡 Quick Start

Here’s a simple example showing how to use NanoBus to publish and subscribe to events:

using NanoBus.Core;

// Create the event bus
var bus = new NanoBus();

// Define an event type
public class OrderPlaced
{
    public string OrderId { get; set; } = string.Empty;
}

// Subscribe to the event
var subscription = bus.CreateSub<OrderPlaced>();

subscription.OnMessage(order =>
{
    Console.WriteLine($"Order received: {order.OrderId}");
});

// Publish an event
bus.Fire(new OrderPlaced { OrderId = "ORD-001" });

// Unsubscribe when done
subscription.Dispose();

Output:

Order received: ORD-001

⚙️ API Overview

IEventBus

Subscription<TEvent>

🧩 Thread Safety

NanoBus ensures safe concurrent publishing and subscribing across multiple threads.

🧹 Lifecycle Management

Each subscription is automatically tracked.
When you call Dispose() on a Subscription<TEvent>, it:

1. Sets IsActive to false.
2. Removes the subscription from the internal dictionary.

This ensures your application won't leak handlers over time.

🧪 Example: Multiple Subscribers

var bus = new NanoBus();

bus.CreateSub<string>().OnMessage(msg => Console.WriteLine($"Handler A: {msg}"));
bus.CreateSub<string>().OnMessage(msg => Console.WriteLine($"Handler B: {msg}"));

bus.Fire("Hello, NanoBus!");

Output:

Handler A: Hello, NanoBus!
Handler B: Hello, NanoBus!

🧠 Design Philosophy

NanoBus is intentionally minimalist — designed for small services, background workers, and local message-passing between components where introducing a full-blown event system (like MediatR, MassTransit, or Kafka) would be excessive.

It’s not meant to replace distributed message buses — it’s a micro bus for in-memory, single-process event delivery.

📄 License

MIT License

Copyright (c) 2025 Paul Q. Peters

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.