Patch-1

benchmark/Microsoft.IdentityModel.Benchmarks/ExpiredCheck.cs

@@ -0,0 +1,57 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System;
+using System.Collections.Concurrent;
+using BenchmarkDotNet.Attributes;
+
+namespace Microsoft.IdentityModel.Benchmarks
+{
+    // dotnet run -c release -f net8.0 --filter Microsoft.IdentityModel.Benchmarks.ExpiredCheck*
+
+    public class ExpiredCheck
+    {
+        private ConcurrentDictionary<int, DateTime> _map1;
+        private ConcurrentDictionary<int, DateTime> _map2;
+
+        [GlobalSetup]
+        public void Setup()
+        {
+            _map1 = new ConcurrentDictionary<int, DateTime>();
+            _map2 = new ConcurrentDictionary<int, DateTime>();
+
+            DateTime now = DateTime.UtcNow;
+            for (int i = 0; i < 100000; i++)
+            {
+                _map1.TryAdd(i, now);
+                _map2.TryAdd(i, now);
+            }
+        }
+
+        [Benchmark]
+        public void RemoveUsingDateTimeUtcNow()
+        {
+            foreach (var entry in _map1)
+            {
+                if (entry.Value < DateTime.UtcNow)
+                {
+                    _map1.TryRemove(entry.Key, out _);
+                }
+            }
+        }
+
+        [Benchmark]
+        public void RemoveUsingDateTimeVariable()
+        {
+            DateTime now = DateTime.UtcNow;
+            foreach (var entry in _map2)
+            {
+                if (entry.Value < now)
+                {
+                    _map2.TryRemove(entry.Key, out _);
+                }
+
+            }
+        }
+    }
+}