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LiteBus is an easy-to-use and ambitious in-process mediator providing the foundation to implement Command Query Separation (CQS). It is implemented with minimal reflection and instead utilizes covariance and contravariance to provide its core functionality.

License: MIT License

C# 100.00%

cqrs cqs csharp dotnet-core mediator eventbus dotnet dispatcher

litebus's Introduction

LiteBus

An easy-to-use and ambitious in-process mediator to implement CQS

For a detailed understanding and advanced use cases, please refer to the Wiki.

Features

Developed with .NET 8.0
Independent (No external dependencies)
Reduced use of reflection
Provides polymorphic dispatch and handling of messages with support for covariance and contravariance
Core Messaging Types include:
- ICommand: Command without result
- ICommand<TResult>: Command with a result
- IQuery<TResult>: Query
- IStreamQuery<TResult>: Query yielding IAsyncEnumerable<TResult>
- IEvent: Event
Designed for flexibility and extensibility
Modular architecture: Abstractions and implementations are provided in distinct packages
Allows ordering of handlers
Can handle plain messages (class types without specific interface implementations)
Supports generic messages
Features both global and individual pre and post handlers. These handlers also support covariance and contravariance
Events do not necessarily need to inherit from IEvent, accommodating DDD scenarios. This is beneficial for maintaining clean domain events without binding them to any particular library interface.

litebus's People

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bubdm amirhosseinfazlikhani abolfathi

litebus's Issues

Question about Cancellation Tokens parameters

Is there a particular reason that System.Threading.CancellationToken is not included in the various command handler interface method definitions as a parameter?

services.AddLiteBus throws System.TypeLoadException

Exception Unhandled:
System.TypeLoadException: 'Could not load type 'LiteBus.Messaging.Abstractions.IPostHandlerHook" from assembly 'LiteBus.Messaging.Abstractions, Version=0.8.1.0, Culture=neutral, PublicKeyToken=null'.'

I have an MVC Core web app, .NET 5.0.

Inside of ConfigureServices, I make a call to services.AddLiteBus((builder) => builder.Register(typeof(MyDbContext).Assembly) which is in a separate project references by the web app.

I am following the instructions from the readme for Litebus for handler registration.

Both LiteBus and LiteBus.Extensions.MicrosoftDependencyInjection package have been imported into both projects.

Add Contextual Scenario

HandlerScenarioAttribute, alternatively named ContextAttribute, allows developers to tag handler classes with a specific operational context.

[HandlerScenario("ServiceBus")]
public class CreateUserCommandValidator : ICommandPreHandler<CreateUserCommand>
{
    // Handler implementation for service bus-specific logic
    // In this example, we could assume there is no need for any type of authorization in validator as the command is coming from backend-to-backend communication
}

StreamAsync always returns null result

Even with hard-coded values within the implementation, a call to QueryMediator.StreamAsync always returns a null instance of IAsyncEnumerable.

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