Issue #25: implement sta command dispatcher

src/MxGateway.Worker/Sta/StaCommand.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Threading;
+using Google.Protobuf.WellKnownTypes;
+using MxGateway.Contracts.Proto;
+
+namespace MxGateway.Worker.Sta;
+
+public sealed class StaCommand
+{
+    public StaCommand(
+        string sessionId,
+        string correlationId,
+        MxCommand command,
+        Timestamp? enqueueTimestamp = null,
+        CancellationToken cancellationToken = default)
+    {
+        if (string.IsNullOrWhiteSpace(sessionId))
+        {
+            throw new ArgumentException("STA command requires a session id.", nameof(sessionId));
+        }
+
+        if (string.IsNullOrWhiteSpace(correlationId))
+        {
+            throw new ArgumentException("STA command requires a correlation id.", nameof(correlationId));
+        }
+
+        SessionId = sessionId;
+        CorrelationId = correlationId;
+        Command = command ?? throw new ArgumentNullException(nameof(command));
+        EnqueueTimestamp = enqueueTimestamp ?? Timestamp.FromDateTime(DateTime.UtcNow);
+        CancellationToken = cancellationToken;
+    }
+
+    public string SessionId { get; }
+
+    public string CorrelationId { get; }
+
+    public MxCommand Command { get; }
+
+    public Timestamp EnqueueTimestamp { get; }
+
+    public CancellationToken CancellationToken { get; }
+
+    public MxCommandKind Kind => Command.Kind;
+
+    public string MethodName => Kind.ToString();
+}