From da998e9285417ecb8d0922990a44f832b6896127 Mon Sep 17 00:00:00 2001
From: Shannon <sdeminick@gmail.com>
Date: Tue, 14 Jul 2020 13:10:19 +1000
Subject: [PATCH] missing file

---
 .../ErrorLoggingConcurrentMergeScheduler.cs   | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 src/Examine/LuceneEngine/Providers/ErrorLoggingConcurrentMergeScheduler.cs

diff --git a/src/Examine/LuceneEngine/Providers/ErrorLoggingConcurrentMergeScheduler.cs b/src/Examine/LuceneEngine/Providers/ErrorLoggingConcurrentMergeScheduler.cs
new file mode 100644
index 000000000..99738bf1a
--- /dev/null
+++ b/src/Examine/LuceneEngine/Providers/ErrorLoggingConcurrentMergeScheduler.cs
@@ -0,0 +1,39 @@
+using System;
+using System.Security;
+using Lucene.Net.Index;
+
+
+namespace Examine.LuceneEngine.Providers
+{
+    /// <summary>
+    /// Used to prevent the appdomain from crashing when lucene runs into a concurrent merge scheduler failure
+    /// </summary>
+    [SecurityCritical]
+    internal class ErrorLoggingConcurrentMergeScheduler : ConcurrentMergeScheduler
+    {
+        private readonly Action<string, Exception> _logger;
+
+        [SecurityCritical]
+        public ErrorLoggingConcurrentMergeScheduler(string indexName, Action<string, Exception> logger)
+        {
+            IndexName = indexName;
+            _logger = logger;
+        }
+
+        public string IndexName { get; }
+
+        [SecurityCritical]
+        protected override void HandleMergeException(System.Exception exc)
+        {
+            try
+            {
+                base.HandleMergeException(exc);
+            }
+            catch (Exception e)
+            {
+                _logger($"Concurrent merge failed for index: {IndexName} if this error is persistent then index rebuilding is necessary", e);
+            }
+        }
+    }
+}
+