From 4e54dfd0af0768050f7f6d0a85a4968ba0e60025 Mon Sep 17 00:00:00 2001
From: Maggiekimani1 <maggiekim42@gmail.com>
Date: Wed, 8 May 2024 11:34:30 +0300
Subject: [PATCH 1/2] Make the readers dictionary in the registry concurrent to
 avoid corrupting the dictionary's state when running concurrent operations

---
 src/Microsoft.OpenApi/Reader/OpenApiReaderRegistry.cs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Microsoft.OpenApi/Reader/OpenApiReaderRegistry.cs b/src/Microsoft.OpenApi/Reader/OpenApiReaderRegistry.cs
index 6605c12f7..2d967dad9 100644
--- a/src/Microsoft.OpenApi/Reader/OpenApiReaderRegistry.cs
+++ b/src/Microsoft.OpenApi/Reader/OpenApiReaderRegistry.cs
@@ -2,6 +2,7 @@
 // Licensed under the MIT license.
 
 using System;
+using System.Collections.Concurrent;
 using System.Collections.Generic;
 using Microsoft.OpenApi.Interfaces;
 
@@ -12,7 +13,7 @@ namespace Microsoft.OpenApi.Reader
     /// </summary>
     public static class OpenApiReaderRegistry
     {
-        private static readonly Dictionary<string, IOpenApiReader> _readers = new(StringComparer.OrdinalIgnoreCase);
+        private static readonly ConcurrentDictionary<string, IOpenApiReader> _readers = new(StringComparer.OrdinalIgnoreCase);
 
         /// <summary>
         /// Defines a default OpenAPI reader.

From 15ce520692a37c7254da4e15a2c26b1b6531ad59 Mon Sep 17 00:00:00 2001
From: Maggiekimani1 <maggiekim42@gmail.com>
Date: Wed, 8 May 2024 16:02:40 +0300
Subject: [PATCH 2/2] Implement PR feedback

---
 src/Microsoft.OpenApi/Reader/OpenApiReaderRegistry.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Microsoft.OpenApi/Reader/OpenApiReaderRegistry.cs b/src/Microsoft.OpenApi/Reader/OpenApiReaderRegistry.cs
index 2d967dad9..e1eea86a1 100644
--- a/src/Microsoft.OpenApi/Reader/OpenApiReaderRegistry.cs
+++ b/src/Microsoft.OpenApi/Reader/OpenApiReaderRegistry.cs
@@ -27,7 +27,7 @@ public static class OpenApiReaderRegistry
         /// <param name="reader">The reader instance.</param>
         public static void RegisterReader(string format, IOpenApiReader reader)
         {
-            _readers[format] = reader;
+            _readers.AddOrUpdate(format, reader, (_, _) => reader);
         }
 
         /// <summary>