FictionArchive/FictionArchive.Service.Shared/Services/EventBus/EventBusBuilder.cs

using Microsoft.Extensions.DependencyInjection;

namespace FictionArchive.Service.Shared.Services.EventBus;

public class EventBusBuilder<TEventBus> where TEventBus : class, IEventBus
{
    private readonly IServiceCollection _services;
    private readonly SubscriptionManager _subscriptionManager;

    public EventBusBuilder(IServiceCollection services)
    {
        _services = services;
        _services.AddSingleton<IEventBus, TEventBus>();
        
        _subscriptionManager = new SubscriptionManager();
        _services.AddSingleton<SubscriptionManager>(_subscriptionManager);
    }

    public EventBusBuilder<TEventBus> Subscribe<TEvent, TEventHandler>() where TEvent : IIntegrationEvent where TEventHandler : class, IIntegrationEventHandler<TEvent>
    {
        _services.AddKeyedTransient<IIntegrationEventHandler, TEventHandler>(typeof(TEvent).Name);
        _subscriptionManager.RegisterSubscription<TEvent>();
        return this;
    }
}