[dotnet] Lazy initialization of log handlers when required

Author: nvborisenko

dotnet/src/webdriver/Internal/Logging/LogContext.cs

@@ -35,6 +35,8 @@ internal class LogContext : ILogContext
 
         private readonly ILogContext _parentLogContext;
 
+        private readonly Lazy<LogHandlerList> _lazyLogHandlerList;
+
         public LogContext(LogEventLevel level, ILogContext parentLogContext, ConcurrentDictionary<Type, ILogger> loggers, IEnumerable<ILogHandler> handlers)
         {
             _level = level;
@@ -45,7 +47,11 @@ public LogContext(LogEventLevel level, ILogContext parentLogContext, ConcurrentD
 
             if (handlers is not null)
             {
-                Handlers = new LogHandlerList(this, handlers);
+                _lazyLogHandlerList = new Lazy<LogHandlerList>(() => new LogHandlerList(this, handlers));
+            }
+            else
+            {
+                _lazyLogHandlerList = new Lazy<LogHandlerList>(() => new LogHandlerList(this));
             }
         }
 
@@ -125,7 +131,7 @@ public ILogContext SetLevel(Type issuer, LogEventLevel level)
             return this;
         }
 
-        public ILogHandlerList Handlers { get; }
+        public ILogHandlerList Handlers => _lazyLogHandlerList.Value;
 
         public void Dispose()
         {

dotnet/test/common/Internal/Logging/LogTest.cs

@@ -119,6 +119,14 @@ public void ShouldCreateContextWithCustomLevel()
             Assert.That(logger.Level, Is.EqualTo(LogEventLevel.Warn));
         }
 
+        [Test]
+        public void ShouldCreateContextWithNullLogHandlers()
+        {
+            var context = new LogContext(LogEventLevel.Info, null, null, handlers: null);
+
+            Assert.That(context.Handlers, Is.Empty);
+        }
+
         [Test]
         public void ContextShouldChangeLevel()
         {