Basic create command and handler for whiteboard

dotnet/AipsCore/Application/Models/Whiteboard/Command/CreateWhiteboard/CreateWhiteboardCommand.cs

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+using System.Windows.Input;
+using AipsCore.Application.Abstract.Command;
+using AipsCore.Domain.Models.Whiteboard.ValueObjects;
+
+namespace AipsCore.Application.Models.Whiteboard.Command.CreateWhiteboard;
+
+public record CreateWhiteboardCommand(string OwnerId, string Title) : ICommand<WhiteboardId>;

dotnet/AipsCore/Application/Models/Whiteboard/Command/CreateWhiteboard/CreateWhiteboardCommandHandler.cs

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+using AipsCore.Application.Abstract.Command;
+using AipsCore.Domain.Abstract;
+using AipsCore.Domain.Models.Whiteboard.External;
+using AipsCore.Domain.Models.Whiteboard.ValueObjects;
+
+namespace AipsCore.Application.Models.Whiteboard.Command.CreateWhiteboard;
+
+public class CreateWhiteboardCommandHandler : ICommandHandler<CreateWhiteboardCommand, WhiteboardId>
+{
+    private readonly IWhiteboardRepository _whiteboardRepository;
+    private readonly IUnitOfWork _unitOfWork;
+    
+    public CreateWhiteboardCommandHandler(IWhiteboardRepository whiteboardRepository, IUnitOfWork unitOfWork)
+    {
+        _whiteboardRepository = whiteboardRepository;
+        _unitOfWork = unitOfWork;
+    }
+    
+    public async Task<WhiteboardId> Handle(CreateWhiteboardCommand command, CancellationToken cancellationToken = default)
+    {
+        WhiteboardCode whiteboardCode;
+        bool codeExists;
+
+        do
+        {
+            whiteboardCode = GenerateUniqueWhiteboardCode();
+
+            codeExists = await _whiteboardRepository.WhiteboardCodeExists(whiteboardCode);
+        } while (codeExists);
+        
+        var whiteboard = Domain.Models.Whiteboard.Whiteboard.Create(command.OwnerId, whiteboardCode.CodeValue, command.Title);
+
+        await _whiteboardRepository.Save(whiteboard, cancellationToken);
+        await _unitOfWork.SaveChangesAsync(cancellationToken);
+        
+        return whiteboard.Id;
+    }
+
+    // TRENUTNO SAMO, CE SE NAPRAVI KO SERVIS IL KAKO VEC KASNIJE
+    private static WhiteboardCode GenerateUniqueWhiteboardCode()
+    {
+        var rng = new Random();
+        char[] result = new char[8];
+
+        for (int i = 0; i < result.Length; i++)
+        {
+            result[i] = (char)('0' + rng.Next(0, 10));
+        }
+        
+        return new WhiteboardCode(new string(result));
+    }
+}