Added command routing

Added router class using attributes
Added success parameter to mc computer response
Added generic answer type class (for future choice results)

Changelog: added

MinecraftDiscordBot/CommandRouter.cs

@@ -0,0 +1,30 @@
+using Discord;
+using Discord.WebSocket;
+using System.Reflection;
+
+namespace MinecraftDiscordBot;
+
+public abstract class CommandRouter<T> : ICommandHandler<T> {
+    private readonly Dictionary<string, HandleCommandDelegate<T>> _handlers = new();
+    public CommandRouter() {
+        foreach (var method in GetType().GetMethods())
+            if (GetHandlerAttribute(method) is CommandHandlerAttribute handler)
+                try {
+                    _handlers.Add(handler.CommandName, method.CreateDelegate<HandleCommandDelegate<T>>(this));
+                } catch (Exception) {
+                    Program.LogWarning("CommandRouter", $"Could not add delegate for method {handler.CommandName} in function {method.ReturnType} {method.Name}(...)!");
+                    throw;
+                }
+    }
+
+    private static CommandHandlerAttribute? GetHandlerAttribute(MethodInfo method)
+        => method.GetCustomAttributes(typeof(CommandHandlerAttribute), true).OfType<CommandHandlerAttribute>().FirstOrDefault();
+    public abstract Task<T> RootAnswer(SocketUserMessage message, CancellationToken ct);
+    public abstract Task<T> FallbackHandler(SocketUserMessage message, string method, string[] parameters, CancellationToken ct);
+    public Task<T> HandleCommand(SocketUserMessage message, string[] parameters, CancellationToken ct)
+        => parameters is { Length: 0 }
+            ? RootAnswer(message, ct)
+            : _handlers.TryGetValue(parameters[0], out var handler)
+                ? handler(message, parameters[1..], ct)
+                : FallbackHandler(message, parameters[0], parameters[1..], ct);
+}

MinecraftDiscordBot/ConnectedComputer.cs

@@ -3,13 +3,23 @@ using Discord.WebSocket;
 using Fleck;
 using Newtonsoft.Json;
 using System.Diagnostics;
+using System.Runtime.Serialization;
 using System.Text;
 
 namespace MinecraftDiscordBot;
 
-public class ConnectedComputer {
+public delegate Task<TResponse> HandleCommandDelegate<TResponse>(SocketUserMessage message, string[] parameters, CancellationToken ct);
+public delegate Task HandleCommandDelegate(SocketUserMessage message, string[] parameters, CancellationToken ct);
+
+[AttributeUsage(AttributeTargets.Method, Inherited = true, AllowMultiple = false)]
+public sealed class CommandHandlerAttribute : Attribute {
+    public CommandHandlerAttribute(string commandName) => CommandName = commandName;
+    public string CommandName { get; }
+}
+
+public class ConnectedComputer : CommandRouter<ResponseType> {
     protected readonly IWebSocketConnection _socket;
-    public ConnectedComputer(IWebSocketConnection socket) {
+    public ConnectedComputer(IWebSocketConnection socket) : base() {
         socket.OnMessage = OnMessage;
         _socket = socket;
     }
@@ -23,6 +33,7 @@ public class ConnectedComputer {
                 return;
             }
         }
+        if (!msg.Success) waiter.SetUnsuccessful();
         waiter.AddChunk(msg.Chunk, msg.Total, msg.Result);
         if (waiter.Finished || waiter.IsCancellationRequested)
             lock (_syncRoot)
@@ -40,6 +51,7 @@ public class ConnectedComputer {
         int ID { get; }
         bool IsCancellationRequested { get; }
         void AddChunk(int chunkId, int totalChunks, string value);
+        void SetUnsuccessful();
     }
 
     protected class ChunkWaiter<T> : IChunkWaiter {
@@ -57,6 +69,7 @@ public class ConnectedComputer {
         public bool IsCancellationRequested => _ct.IsCancellationRequested;
         private string?[]? _chunks = null;
         private int _receivedChunks = 0;
+        private bool _success = true;
         private readonly object _syncRoot = new();
         public void AddChunk(int chunkId, int totalChunks, string value) {
             lock (_syncRoot) {
@@ -75,9 +88,12 @@ public class ConnectedComputer {
             if (++_receivedChunks == totalChunks) FinalizeResult(_chunks);
         }
         private void FinalizeResult(string?[] _chunks) {
-            tcs.SetResult(resultParser(string.Concat(_chunks)));
+            var resultString = string.Concat(_chunks);
+            if (_success) tcs.SetResult(resultParser(resultString));
+            else tcs.SetException(new ReplyException(resultString));
             Finished = true;
         }
+        public void SetUnsuccessful() => _success = false;
     }
 
     protected int GetFreeId() {
@@ -101,9 +117,7 @@ public class ConnectedComputer {
 
     protected static Func<string, T> Deserialize<T>() => msg
          => JsonConvert.DeserializeObject<T>(msg) ?? throw new InvalidProgramException("Empty response!");
-}
 
-public class RefinedStorageComputer : ConnectedComputer {
     public const string Role = "rs";
     private const string CmdEnergyUsage = "energyusage";
     private const string CmdEnergyStorage = "energystorage";
@@ -111,7 +125,6 @@ public class RefinedStorageComputer : ConnectedComputer {
     private const string CmdItemName = "itemname";
     private const string CmdListFluids = "listfluids";
 
-    public RefinedStorageComputer(IWebSocketConnection socket) : base(socket) { }
     public async Task<int> GetEnergyUsageAsync(CancellationToken ct) {
         var waiter = GetWaiter(int.Parse, ct);
         await Send(new RequestMessage(waiter.ID, CmdEnergyUsage));
@@ -134,46 +147,21 @@ public class RefinedStorageComputer : ConnectedComputer {
         return await waiter.Task;
     }
 
-    public async Task HandleCommand(SocketUserMessage message, string[] parameters, CancellationToken ct) {
+    [CommandHandler(CmdEnergyStorage)]
-        if (parameters is not { Length: > 0 }) {
+    public async Task<ResponseType> HandleEnergyStorage(SocketUserMessage message, string[] parameters, CancellationToken ct)
-            await message.ReplyAsync($"Refined Storage system is online");
+        => ResponseType.AsString($"Refined Storage system stores {await GetEnergyStorageAsync(ct)} RF/t");
-            return;
+    [CommandHandler(CmdEnergyUsage)]
-        }
+    public async Task<ResponseType> HandleEnergyUsage(SocketUserMessage message, string[] parameters, CancellationToken ct)
-
+        => ResponseType.AsString($"Refined Storage system currently uses {await GetEnergyUsageAsync(ct)} RF/t");
-        try {
+    [CommandHandler(CmdItemName)]
-            switch (parameters[0].ToLower()) {
+    public async Task<ResponseType> HandleItemName(SocketUserMessage message, string[] parameters, CancellationToken ct) {
-            case CmdEnergyUsage:
+        if (parameters.Length < 2) return ResponseType.AsString($"Usage: {CmdItemName} filters...");
-                await message.ReplyAsync($"Refined Storage system currently uses {await GetEnergyUsageAsync(ct)} RF/t");
-                break;
-            case CmdEnergyStorage:
-                await message.ReplyAsync($"Refined Storage system stores {await GetEnergyStorageAsync(ct)} RF/t");
-                break;
-            case CmdListItems:
-                await HandleItemListing(message, ct);
-                break;
-            case CmdItemName:
-                await HandleItemName(message, parameters, ct);
-                break;
-            case CmdListFluids:
-                await HandleFluidListing(message, ct);
-                break;
-            case string other:
-                await message.ReplyAsync($"Refined Storages cannot do '{other}', bruh");
-                break;
-            }
-        } catch (TaskCanceledException) {
-            await message.ReplyAsync("The Refined Storage system request timed out!");
-        }
-    }
-
-    private async Task HandleItemName(SocketUserMessage message, string[] parameters, CancellationToken ct) {
-        if (parameters.Length < 2) await message.ReplyAsync($"Usage: {CmdItemName} filters...");
         else {
             var items = await FilterItems(message, parameters[1..], ct);
             var sb = new StringBuilder();
             sb.AppendLine("Did you mean:");
             sb.AppendJoin("\n", items.Select(i => i.ToString()));
-            await message.ReplyAsync(sb.ToString());
+            return ResponseType.AsString(sb.ToString());
         }
     }
 
@@ -188,51 +176,22 @@ public class RefinedStorageComputer : ConnectedComputer {
         return items.ToList();
     }
 
-    public abstract class ItemFilter {
+    [CommandHandler(CmdListFluids)]
-        public abstract bool Match(Fluid item);
+    public async Task<ResponseType> HandleFluidListing(SocketUserMessage message, string[] parameters, CancellationToken ct) {
-        public virtual bool MatchItem(Item item) => Match(item);
-
-        public static ItemFilter Parse(string filter)
-            => filter.StartsWith('@')
-                ? new ModNameFilter(filter[1..])
-                : filter.StartsWith('$')
-                ? new TagFilter(filter[1..])
-                : new ItemNameFilter(filter);
-
-        private class ModNameFilter : ItemFilter {
-            private readonly string filter;
-            public ModNameFilter(string filter) => this.filter = filter;
-            public override bool Match(Fluid item) => item.ItemId.ModName.Contains(filter, StringComparison.InvariantCultureIgnoreCase);
-        }
-
-        private class TagFilter : ItemFilter {
-            private readonly string filter;
-            public TagFilter(string filter) => this.filter = filter;
-            public override bool Match(Fluid item)
-                => item.Tags?.Any(tag => tag.Contains(filter, StringComparison.InvariantCultureIgnoreCase)) ?? false;
-        }
-
-        private class ItemNameFilter : ItemFilter {
-            private readonly string filter;
-            public ItemNameFilter(string filter) => this.filter = filter;
-            public override bool Match(Fluid item) => item.DisplayName.Contains(filter, StringComparison.InvariantCultureIgnoreCase);
-        }
-    }
-
-    private async Task HandleFluidListing(SocketUserMessage message, CancellationToken ct) {
         var sb = new StringBuilder();
         sb.Append("The Refined Storage system stores those fluids:");
         var fluids = await ListFluidsAsync(ct);
         foreach (var fluid in fluids.OrderByDescending(i => i.Amount))
             if (fluid.Amount > 10000) sb.AppendFormat("\n{0:n2} B of {1}", fluid.Amount / 1000.0f, fluid.DisplayName);
             else sb.AppendFormat("\n{0:n0} mB of {1}", fluid.Amount, fluid.DisplayName);
-        await message.ReplyAsync(sb.ToString());
+        return ResponseType.AsString(sb.ToString());
     }
 
     private List<Item>? Items;
     private readonly object _itemLock = new();
 
-    private async Task HandleItemListing(SocketUserMessage message, CancellationToken ct) {
+    [CommandHandler(CmdListItems)]
+    public async Task<ResponseType> HandleItemListing(SocketUserMessage message, string[] parameters, CancellationToken ct) {
         var sb = new StringBuilder();
         sb.Append("The Refined Storage system currently stores these items:");
         var items = await RefreshItemList(ct);
@@ -245,7 +204,7 @@ public class RefinedStorageComputer : ConnectedComputer {
             }
             if (items.Count > taken) sb.AppendFormat("\nand {0} more items.", items.Skip(taken).Sum(i => i.Amount));
         }
-        await message.ReplyAsync(sb.ToString());
+        return ResponseType.AsString(sb.ToString());
     }
 
     private async Task<List<Item>> RefreshItemList(CancellationToken ct) {
@@ -255,6 +214,19 @@ public class RefinedStorageComputer : ConnectedComputer {
             return Items;
         }
     }
+
+    public override Task<ResponseType> RootAnswer(SocketUserMessage message, CancellationToken ct)
+        => Task.FromResult(ResponseType.AsString("The Minecraft server is connected!"));
+    public override Task<ResponseType> FallbackHandler(SocketUserMessage message, string method, string[] parameters, CancellationToken ct)
+        => Task.FromResult(ResponseType.AsString($"What the fuck do you mean by '{method}'?"));
+}
+
+[Serializable]
+public class ReplyException : Exception {
+    public ReplyException() { }
+    public ReplyException(string message) : base(message) { }
+    public ReplyException(string message, Exception inner) : base(message, inner) { }
+    protected ReplyException(SerializationInfo info, StreamingContext context) : base(info, context) { }
 }
 
 [JsonObject(MemberSerialization.OptIn, Description = "Describes an item in a Refined Storage system.", MissingMemberHandling = MissingMemberHandling.Ignore)]

MinecraftDiscordBot/ICommandHandler.cs

@@ -0,0 +1,11 @@
+using Discord.WebSocket;
+
+namespace MinecraftDiscordBot;
+
+public interface ICommandHandler {
+    Task HandleCommand(SocketUserMessage message, string[] parameters, CancellationToken ct);
+}
+
+public interface ICommandHandler<T> {
+    Task<T> HandleCommand(SocketUserMessage message, string[] parameters, CancellationToken ct);
+}

MinecraftDiscordBot/ItemFilter.cs

@@ -0,0 +1,32 @@
+namespace MinecraftDiscordBot;
+
+public abstract class ItemFilter {
+    public abstract bool Match(Fluid item);
+    public virtual bool MatchItem(Item item) => Match(item);
+
+    public static ItemFilter Parse(string filter)
+        => filter.StartsWith('@')
+            ? new ModNameFilter(filter[1..])
+            : filter.StartsWith('$')
+            ? new TagFilter(filter[1..])
+            : new ItemNameFilter(filter);
+
+    private class ModNameFilter : ItemFilter {
+        private readonly string filter;
+        public ModNameFilter(string filter) => this.filter = filter;
+        public override bool Match(Fluid item) => item.ItemId.ModName.Contains(filter, StringComparison.InvariantCultureIgnoreCase);
+    }
+
+    private class TagFilter : ItemFilter {
+        private readonly string filter;
+        public TagFilter(string filter) => this.filter = filter;
+        public override bool Match(Fluid item)
+            => item.Tags?.Any(tag => tag.Contains(filter, StringComparison.InvariantCultureIgnoreCase)) ?? false;
+    }
+
+    private class ItemNameFilter : ItemFilter {
+        private readonly string filter;
+        public ItemNameFilter(string filter) => this.filter = filter;
+        public override bool Match(Fluid item) => item.DisplayName.Contains(filter, StringComparison.InvariantCultureIgnoreCase);
+    }
+}

MinecraftDiscordBot/Message.cs

@@ -11,7 +11,7 @@ public abstract class Message {
 public class CapabilityMessage : Message {
     public override string Type => "roles";
     [JsonProperty("role", Required = Required.Always)]
-    public string Role { get; set; } = default!;
+    public string[] Role { get; set; } = default!;
 }
 
 public class TextMessage : Message {
@@ -36,10 +36,15 @@ public class ReplyMessage : Message {
     public int AnswerId { get; set; }
     [JsonProperty("result", Required = Required.Always)]
     public string Result { get; set; }
-    [JsonProperty("chunk", Required = Required.Always)]
+    [JsonProperty("chunk", Required = Required.DisallowNull)]
-    public int Chunk { get; set; }
+    public int Chunk { get; set; } = 1;
-    [JsonProperty("total", Required = Required.Always)]
+    [JsonProperty("total", Required = Required.DisallowNull)]
-    public int Total { get; set; }
+    public int Total { get; set; } = 1;
+    /// <summary>
+    /// If at least one packet was received where 
+    /// </summary>
+    [JsonProperty("success", Required = Required.DisallowNull)]
+    public bool Success { get; set; } = true;
     public override string Type => "reply";
 }
 

MinecraftDiscordBot/MinecraftDiscordBot.csproj

@@ -21,6 +21,7 @@
     <PackageReference Include="Fleck" Version="1.2.0" />
     <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.14.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+    <PackageReference Include="OneOf" Version="3.0.205" />
   </ItemGroup>
 
 </Project>

MinecraftDiscordBot/Program.cs

@@ -1,17 +1,18 @@
-using CommandLine;
+using CommandLine;
 using Discord;
 using Discord.Commands;
 using Discord.Rest;
 using Discord.WebSocket;
 using Fleck;
 using Newtonsoft.Json;
+using OneOf;
 using System.Collections.Concurrent;
 using System.Reflection;
 using System.Runtime.CompilerServices;
 
 namespace MinecraftDiscordBot;
 
-public class Program : IDisposable {
+public class Program : IDisposable, ICommandHandler<ResponseType> {
     public const string WebSocketSource = "WebSocket";
     public const string BotSource = "Bot";
     private static readonly object LogLock = new();
@@ -25,13 +26,15 @@ public class Program : IDisposable {
     private readonly ConcurrentDictionary<Guid, ConnectedComputer> _connections = new();
     private static readonly char[] WhiteSpace = new char[] { '\t', '\n', ' ', '\r' };
     public ITextChannel[] _channels = Array.Empty<ITextChannel>();
-    private RefinedStorageComputer? _rsSystem = null;
+    private ConnectedComputer? _rsSystem = null;
     private bool disposedValue;
+    public static bool OnlineNotifications => false;
 
-    public RefinedStorageComputer? RsSystem {
+    public ConnectedComputer? Computer {
         get => _rsSystem; set {
             if (_rsSystem != value) {
                 _rsSystem = value;
+                if (OnlineNotifications)
                     _ = Task.Run(() => Broadcast(i => i.SendMessageAsync(value is null
                           ? $"The Refined Storage went offline. Please check the server!"
                           : $"The Refined Storage is back online!")));
@@ -115,27 +118,13 @@ public class Program : IDisposable {
         }
     }
 
-    private async Task SocketReceived(IWebSocketConnection socket, string message) {
+    private static async Task SocketReceived(IWebSocketConnection socket, string message)
-        if (JsonConvert.DeserializeObject<CapabilityMessage>(message) is not CapabilityMessage capability) return;
+        => await LogInfoAsync(WebSocketSource, $"[{socket.ConnectionInfo.Id}] Received: {message}");
 
-        try {
+    private void AddComputerSocket(IWebSocketConnection socket, ConnectedComputer pc) => Computer = pc;
-            var pc = capability.Role switch {
-                RefinedStorageComputer.Role => new RefinedStorageComputer(socket),
-                string role => throw new ArgumentException($"Invalid role '{role}'!")
-            };
-            AddComputerSocket(socket, pc);
-            await LogInfoAsync(WebSocketSource, $"[{socket.ConnectionInfo.Id}] Presented capability as {pc.GetType().Name}");
-        } catch (ArgumentException e) {
-            await LogErrorAsync(WebSocketSource, e);
-        }
-    }
-
-    private void AddComputerSocket(IWebSocketConnection socket, ConnectedComputer pc) {
-        if (pc is RefinedStorageComputer rs) RsSystem = rs;
-    }
 
     private void RemoveComputerSocket(IWebSocketConnection socket) {
-        if (RsSystem?.ConnectionInfo.Id == socket.ConnectionInfo.Id) RsSystem = null;
+        if (Computer is { ConnectionInfo.Id: Guid id } && id == socket.ConnectionInfo.Id) Computer = null;
     }
 
     private async Task SocketClosed(IWebSocketConnection socket) {
@@ -143,8 +132,10 @@ public class Program : IDisposable {
         await LogInfoAsync(WebSocketSource, $"[{socket.ConnectionInfo.Id}] Client disconnected!");
     }
 
-    private static async Task SocketOpened(IWebSocketConnection socket)
+    private async Task SocketOpened(IWebSocketConnection socket) {
-        => await LogInfoAsync(WebSocketSource, $"[{socket.ConnectionInfo.Id}] Client connected from {socket.ConnectionInfo.ClientIpAddress}:{socket.ConnectionInfo.ClientPort}!");
+        AddComputerSocket(socket, new(socket));
+        await LogInfoAsync(WebSocketSource, $"[{socket.ConnectionInfo.Id}] Client connected from {socket.ConnectionInfo.ClientIpAddress}:{socket.ConnectionInfo.ClientPort}!");
+    }
 
     private async Task DiscordMessageReceived(SocketMessage arg, int timeout = 10000) {
         if (arg is not SocketUserMessage message) return;
@@ -155,7 +146,10 @@ public class Program : IDisposable {
 
         if (IsCommand(message, out var argPos)) {
             var parameters = message.Content[argPos..].Split(WhiteSpace, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
-            _ = Task.Run(() => HandleCommand(message, parameters, cts.Token));
+            _ = Task.Run(async () => {
+                var response = await HandleCommand(message, parameters, cts.Token);
+                await SendResponse(message, response);
+            });
             return;
         }
 
@@ -163,18 +157,34 @@ public class Program : IDisposable {
         // TODO: Relay Message to Chat Receiver   
     }
 
-    private Task HandleCommand(SocketUserMessage message, string[] parameters, CancellationToken ct)
+    private static Task SendResponse(SocketUserMessage message, ResponseType response) => response switch {
-        => parameters is { Length: > 0 }
+        ResponseType.IChoiceResponse res => HandleChoice(message, res),
-            ? parameters[0].ToLower() switch {
+        ResponseType.StringResponse res => message.ReplyAsync(res.Message),
-                RefinedStorageComputer.Role => HandleRefinedStorageCommand(message, parameters[1..], ct),
+        _ => message.ReplyAsync($"Whoops, someone forgot to implement '{response.GetType()}' responses?"),
-                _ => message.ReplyAsync($"What the fuck do you mean by '{parameters[0]}'?")
+    };
-            }
-            : message.ReplyAsync($"You really think an empty command works?");
 
-    private Task HandleRefinedStorageCommand(SocketUserMessage message, string[] parameters, CancellationToken ct)
+    private static async Task HandleChoice(SocketUserMessage message, ResponseType.IChoiceResponse res) {
-        => RsSystem is RefinedStorageComputer rs
+        var reply = await message.ReplyAsync($"{res.Query}\n{string.Join("\n", res.Options)}");
-            ? rs.HandleCommand(message, parameters, ct)
+        var reactions = new Emoji[] { new("0️⃣"), new("1️⃣"), new("2️⃣"), new("3️⃣"), new("4️⃣"), new("5️⃣"), new("6️⃣"), new("7️⃣"), new("8️⃣"), new("9️⃣") };
-            : message.ReplyAsync("The Refined Storage system is currently unavailable!");
+        await reply.AddReactionsAsync(reactions);
+    }
+
+    public async Task<ResponseType> HandleCommand(SocketUserMessage message, string[] parameters, CancellationToken ct) {
+        return ResponseType.FromChoice("Select an emoji:", new[] { "One", "Two", "Nine", "420" }, (choice) => message.ReplyAsync($"You chose: {choice}"));
+        if (Computer is ICommandHandler<ResponseType> handler)
+            try {
+                return await handler.HandleCommand(message, parameters, ct);
+            } catch (TaskCanceledException) {
+                return ResponseType.AsString("Your request could not be processed in time!");
+            } catch (ReplyException e) {
+                await LogWarningAsync(BotSource, e.Message);
+                return ResponseType.AsString($"Your request failed: {e.Message}");
+            } catch (Exception e) {
+                await LogErrorAsync(BotSource, e);
+                return ResponseType.AsString($"Oopsie doopsie, this should not have happened!");
+            }
+        else return ResponseType.AsString("The Minecraft server is currently unavailable!");
+    }
 
     private bool IsCommand(SocketUserMessage message, out int argPos) {
         argPos = 0;
@@ -227,3 +237,32 @@ public class Program : IDisposable {
         GC.SuppressFinalize(this);
     }
 }
+
+public abstract class ResponseType {
+    private static string DefaultDisplay<T>(T obj) => obj?.ToString() ?? throw new InvalidProgramException("ToString did not yield anything!");
+    public static ResponseType AsString(string message) => new StringResponse(message);
+    public static ResponseType FromChoice<T>(string query, IEnumerable<T> choice, Func<T, Task> resultHandler, Func<T, string>? display = null) => new ChoiceResponse<T>(query, choice, resultHandler, display ?? DefaultDisplay);
+    public class StringResponse : ResponseType {
+        public StringResponse(string message) => Message = message;
+        public string Message { get; }
+    }
+    public interface IChoiceResponse {
+        IEnumerable<string> Options { get; }
+        string Query { get; }
+        Task HandleResult(int index);
+    }
+    public class ChoiceResponse<T> : ResponseType, IChoiceResponse {
+        private readonly Func<T, Task> _resultHandler;
+        private readonly T[] _options;
+        private readonly Func<T, string> _displayer;
+        public IEnumerable<string> Options => _options.Select(_displayer);
+        public string Query { get; }
+        public Task HandleResult(int index) => _resultHandler(_options[index]);
+        public ChoiceResponse(string query, IEnumerable<T> choice, Func<T, Task> resultHandler, Func<T, string> display) {
+            Query = query;
+            _resultHandler = resultHandler;
+            _options = choice.ToArray();
+            _displayer = display;
+        }
+    }
+}