refactor routing

src/Umbraco.Core/UpgradeableReadLock.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+
+namespace Umbraco.Core
+{
+    /// <summary>
+    /// Provides a convenience methodology for implementing locked access to resources. 
+    /// </summary>
+    /// <remarks>
+    /// Intended as an infrastructure class.
+    /// </remarks>
+    public class ReadLock : IDisposable
+    {
+        private readonly ReaderWriterLockSlim _rwLock;
+
+        /// <summary>
+		/// Initializes a new instance of the <see cref="ReadLock"/> class.
+        /// </summary>
+        /// <ReadLock name="rwLock">The rw lock.</param>
+		public ReadLock(ReaderWriterLockSlim rwLock)
+        {
+            _rwLock = rwLock;
+            _rwLock.EnterReadLock();
+        }
+
+        void IDisposable.Dispose()
+        {
+            _rwLock.ExitReadLock();
+        }
+    }
+}