Eliminate overhead in the Log API when logging is disabled.

Author: claudiamurialdo

dotnet/src/dotnetframework/GxClasses/Diagnostics/Log.cs

@@ -1,6 +1,8 @@
 using GeneXus.Attributes;
 using GeneXus.Configuration;
 using log4net;
+using System.Collections.Concurrent;
+
 #if NETCORE
 using GeneXus.Services.Log;
 using Microsoft.Extensions.Logging;
@@ -26,17 +28,19 @@ private enum LogLevel
 		private static readonly string DefaultRepository = LogManager.GetRepository().Name;
 		private static readonly string DefaultUserLogNamespace = Config.GetValueOf("USER_LOG_NAMESPACE", LogConfiguration.USER_LOG_TOPIC);
 		private static readonly IGXLogger GlobalLog = new GXLoggerLog4Net(LogManager.GetLogger(DefaultRepository, DefaultUserLogNamespace));
-
+		private static ConcurrentDictionary<string, IGXLogger> LoggerDictionary = new ConcurrentDictionary<string, IGXLogger>() { [string.Empty] = GlobalLog };
 		internal static IGXLogger GetLogger(string topic)
 		{
-			if (!string.IsNullOrEmpty(topic))
+			if (LoggerDictionary.TryGetValue(topic, out IGXLogger logger))
 			{
-				string loggerName = topic.StartsWith(LoggerPrefix) ? topic.Substring(1) : $"{DefaultUserLogNamespace}.{topic.Trim()}";
-				return GXLoggerFactory.GetLogger(loggerName);
+				return logger;
 			}
 			else
 			{
-				return GlobalLog;
+				string loggerName = topic.StartsWith(LoggerPrefix) ? topic.Substring(1) : $"{DefaultUserLogNamespace}.{topic.Trim()}";
+				logger = GXLoggerFactory.GetLogger(loggerName);
+				LoggerDictionary.TryAdd(topic, logger);
+				return logger;
 			}
 		}