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in repository https://gitbox.apache.org/repos/asf/lucenenet.git

commit 5aaf59acf7987616f93abf9aa3ab087a35648bdc
Author: Thomas Mathew <[email protected]>
AuthorDate: Fri Jun 7 13:35:48 2019 -0700

    Use ConcurrentDictionary::GetOrAdd
---
 src/Lucene.Net/Support/IO/FileSupport.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Lucene.Net/Support/IO/FileSupport.cs 
b/src/Lucene.Net/Support/IO/FileSupport.cs
index 55e722a..dacba8b 100644
--- a/src/Lucene.Net/Support/IO/FileSupport.cs
+++ b/src/Lucene.Net/Support/IO/FileSupport.cs
@@ -180,7 +180,7 @@ namespace Lucene.Net.Support.IO
             return Path.Combine(directory.FullName, string.Concat(prefix, 
randomFileName));
         }
 
-        private static readonly IDictionary<string, string> fileCanonPathCache 
= new ConcurrentDictionary<string, string>();
+        private static readonly ConcurrentDictionary<string, string> 
fileCanonPathCache = new ConcurrentDictionary<string, string>();
 
         /// <summary>
         /// Returns the absolute path of this <see cref="FileSystemInfo"/> 
with all references resolved and
@@ -299,7 +299,7 @@ namespace Lucene.Net.Support.IO
             //newResult = getCanonImpl(newResult);
             newLength = newResult.Length;
             canonPath = Encoding.UTF8.GetString(newResult, 0, 
newLength).TrimEnd('\0'); // LUCENENET: Eliminate null terminator char
-            fileCanonPathCache[absPath] = canonPath;
+            canonPath = fileCanonPathCache.GetOrAdd(absPath, canonPath); // 
It's possible that a concurrent call may have already added it to the cache.
             return canonPath;
         }
     }

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