implement irDaemon last token caching.

RaceLapTimer/IrDaemonNotifier/IrDaemonTransponderUtilities.cs

@@ -1,3 +1,5 @@
+using System;
+using System.Threading;
 using System.Threading.Tasks;
 using Interfaces;
 
@@ -6,10 +8,52 @@ namespace IrDaemonNotifier
     public class IrDaemonTransponderUtilities : ITransponderUtilityProvider
     {
         private readonly ILoggerService _logger;
+        private int _lastScannedId = -1;
+        private readonly object _lastScanedLock = new object();
+        private readonly Thread _idRefreshThread;
+        private bool _killRefreshThread;
 
         public IrDaemonTransponderUtilities(ILoggerService logger)
         {
             _logger = logger;
+            _idRefreshThread = new Thread(IrDaemonInterrogation)
+            {
+                IsBackground = true,
+                Name = "Ir Daemon Id Update Thread",
+                Priority = ThreadPriority.BelowNormal
+            };
+            _killRefreshThread = false;
+            _idRefreshThread.Start();
+        }
+
+        private void IrDaemonInterrogation()
+        {
+            while (!_killRefreshThread)
+            {
+                try
+                {
+                    var communicator = new IrDaemonCommunicator(_logger);
+                    var lastId = communicator.RequestData<int>(Commands.Properties.GetLastToken);
+                    lock (_lastScanedLock)
+                    {
+                        _lastScannedId = lastId;
+                    }
+                    Thread.Sleep(500);
+                }
+                catch (Exception e)
+                {
+                    _logger.Error(e);
+                }
+            }
+        }
+
+        ~IrDaemonTransponderUtilities()
+        {
+            _killRefreshThread = true;
+            if (_idRefreshThread.IsAlive)
+            {
+                _idRefreshThread.Abort();
+            }
         }
 
         public Task<int> GetLastScannedIdAsync()
@@ -24,9 +68,10 @@ namespace IrDaemonNotifier
 
         private int GetLastId()
         {
-            //TODO: implement caching here, network/request latency is mega, always exceeds 1second, this is too much
-            var communicator = new IrDaemonCommunicator(_logger);
-            return communicator.RequestData<int>(Commands.Properties.GetLastToken);
+            lock (_lastScanedLock)
+            {
+                return _lastScannedId;
+            }
         }
     }
 }