Enhance concurrent access with ArchiBoT concurrent hashset

ArchiSteamFarm/ConcurrentEnumerator.cs

@@ -0,0 +1,59 @@
+/*
+    _                _      _  ____   _                           _____
+   / \    _ __  ___ | |__  (_)/ ___| | |_  ___   __ _  _ __ ___  |  ___|__ _  _ __  _ __ ___
+  / _ \  | '__|/ __|| '_ \ | |\___ \ | __|/ _ \ / _` || '_ ` _ \ | |_  / _` || '__|| '_ ` _ \
+ / ___ \ | |  | (__ | | | || | ___) || |_|  __/| (_| || | | | | ||  _|| (_| || |   | | | | | |
+/_/   \_\|_|   \___||_| |_||_||____/  \__|\___| \__,_||_| |_| |_||_|   \__,_||_|   |_| |_| |_|
+
+ Copyright 2015-2016 Łukasz "JustArchi" Domeradzki
+ Contact: JustArchi@JustArchi.net
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+					
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+*/
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Threading;
+
+namespace ArchiSteamFarm {
+	internal sealed class ConcurrentEnumerator<T> : IEnumerator<T> {
+		public T Current => Enumerator.Current;
+
+		object IEnumerator.Current => Current;
+
+		private readonly IEnumerator<T> Enumerator;
+		private readonly ReaderWriterLockSlim Lock;
+
+		internal ConcurrentEnumerator(ICollection<T> collection, ReaderWriterLockSlim @lock) {
+			if ((collection == null) || (@lock == null)) {
+				throw new ArgumentNullException(nameof(collection) + " || " + nameof(@lock));
+			}
+
+			@lock.EnterReadLock();
+
+			Lock = @lock;
+			Enumerator = collection.GetEnumerator();
+		}
+
+		public bool MoveNext() => Enumerator.MoveNext();
+		public void Reset() => Enumerator.Reset();
+
+		public void Dispose() {
+			if (Lock != null) {
+				Lock.ExitReadLock();
+			}
+		}
+	}
+}