1 files changed, 39 insertions, 0 deletions
diff --git a/src/mscorlib/shared/System/Diagnostics/Tracing/TraceLogging/SimpleEventTypes.cs b/src/mscorlib/shared/System/Diagnostics/Tracing/TraceLogging/SimpleEventTypes.cs
new file mode 100644
index 0000000000..cdced968f0
--- /dev/null
+++ b/src/mscorlib/shared/System/Diagnostics/Tracing/TraceLogging/SimpleEventTypes.cs
@@ -0,0 +1,39 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using Interlocked = System.Threading.Interlocked;
+
+#if ES_BUILD_STANDALONE
+namespace Microsoft.Diagnostics.Tracing
+#else
+namespace System.Diagnostics.Tracing
+#endif
+{
+    /// <summary>
+    /// TraceLogging: Contains the metadata needed to emit an event, optimized
+    /// for events with one top-level compile-time-typed payload object.
+    /// </summary>
+    /// <typeparam name="T">
+    /// Type of the top-level payload object. Should be EmptyStruct if the
+    /// event has no payload.
+    /// </typeparam>
+    internal static class SimpleEventTypes<T>
+    {
+        private static TraceLoggingEventTypes instance;
+
+        public static TraceLoggingEventTypes Instance
+        {
+            get { return instance ?? InitInstance(); }
+        }
+
+        private static TraceLoggingEventTypes InitInstance()
+        {
+            var info = TraceLoggingTypeInfo.GetInstance(typeof(T), null);
+            var newInstance = new TraceLoggingEventTypes(info.Name, info.Tags, new TraceLoggingTypeInfo[] { info });
+            Interlocked.CompareExchange(ref instance, newInstance, null);
+            return instance;
+        }
+    }
+}