feat: add event bus

Client/Infrastructure/Events/InMemoryEventBus.cs

@@ -0,0 +1,49 @@
+using Client.Domain.Events;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Data;
+
+namespace Client.Infrastructure.Events
+{
+    public class InMemoryEventBus : EventBusInterface
+    {
+        public void Publish<T>(T @event) where T : EventInterface
+        {
+            var type = @event.GetType();
+            if (subscribers.ContainsKey(type))
+            {
+                foreach (var subscriber in subscribers[type])   
+                {
+                    (subscriber as EventHandlerInterface<T>)?.Handle(@event);
+                }
+            }
+        }
+
+        public void Subscrbe<T>(EventHandlerInterface<T> handler) where T : EventInterface
+        {
+            var type = typeof(T);
+
+            if (!subscribers.ContainsKey(type))
+            {
+                subscribers[type] = new List<EventHandlerInterface>();
+            }
+
+            subscribers[type].Add(handler);
+        }
+
+        public void Unsubscrbe<T>(EventHandlerInterface<T> handler) where T : EventInterface
+        {
+            var type = typeof(T);
+
+            if (subscribers.ContainsKey(type))
+            {
+                subscribers[type].Remove(handler);
+            }
+        }
+
+        private Dictionary<Type, List<EventHandlerInterface>> subscribers = new Dictionary<Type, List<EventHandlerInterface>>();
+    }
+}