feat: add chat messages

Client/Domain/Service/ChatMessageHandler.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Client.Domain.DTO;
+using Client.Domain.Entities;
+using Client.Domain.Enums;
+using Client.Domain.Factories;
+using Client.Domain.ValueObjects;
+
+namespace Client.Domain.Service
+{
+    public class ChatMessageHandler : HandlerInterface
+    {
+        public void Update(MessageOperationEnum operation, string content)
+        {
+            var message = factory.Create(content);
+            if (operation == MessageOperationEnum.Create)
+            {
+                if (message == null)
+                {
+                    throw new ArgumentNullException(nameof(message));
+                }
+                messages.Add(message);
+            }
+        }
+
+        public ChatMessageHandler(EntityFactoryInterface<ChatMessage> factory)
+        {
+            this.factory = factory;
+        }
+
+        private readonly EntityFactoryInterface<ChatMessage> factory;
+        private List<ChatMessage> messages = new List<ChatMessage>();
+    }
+}

Client/Domain/Service/EntityHandler.cs

@@ -10,7 +10,7 @@ using Client.Domain.Factories;
 
 namespace Client.Domain.Service
 {
-    public class EntityHandler<T> : HandlerInterface where T : EntityInterface
+    public class EntityHandler<T> : HandlerInterface where T : class, EntityInterface
     {
         public void Update(MessageOperationEnum operation, string content)
         {