some changes

Femto.Api/Infrastructure/EventBus.cs

@@ -0,0 +1,32 @@
+using System.Threading.Channels;
+using Femto.Common.Integration;
+
+namespace Femto.Api.Infrastructure;
+
+public class EventBus(Channel<IEvent> channel) : BackgroundService, IEventBus
+{
+    private readonly ICollection<IEventBus.Subscriber> _subscribers = [];
+
+    public Task Publish<T>(T evt)
+        where T : IEvent
+    {
+        channel.Writer.TryWrite(evt);
+        
+        return Task.CompletedTask;
+    }
+
+    public void Subscribe(IEventBus.Subscriber subscriber)
+    {
+        this._subscribers.Add(subscriber);
+    }
+
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        await foreach (var message in channel.Reader.ReadAllAsync(stoppingToken))
+        {
+            await Task.WhenAll(
+                this._subscribers.Select(subscriber => subscriber.Invoke(message, stoppingToken))
+            );
+        }
+    }
+}