Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.ServiceModel/System/ServiceModel/Channels/MsmqInputMessagePool.cs

@@ -0,0 +1,40 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+namespace System.ServiceModel.Channels
+{
+    interface IMsmqMessagePool : IDisposable
+    {
+        MsmqInputMessage TakeMessage();
+        void ReturnMessage(MsmqInputMessage message);
+    }
+
+    sealed class MsmqInputMessagePool
+        : SynchronizedDisposablePool<MsmqInputMessage>, IMsmqMessagePool
+    {
+        int maxPoolSize;
+
+        internal MsmqInputMessagePool(int maxPoolSize)
+            : base(maxPoolSize)
+        {
+            this.maxPoolSize = maxPoolSize;
+        }
+
+        MsmqInputMessage IMsmqMessagePool.TakeMessage()
+        {
+            MsmqInputMessage message = this.Take();
+            if (null == message)
+                message = new MsmqInputMessage();
+            return message;
+        }
+
+        void IMsmqMessagePool.ReturnMessage(MsmqInputMessage message)
+        {
+            if (!this.Return(message))
+            {
+                MsmqDiagnostics.PoolFull(this.maxPoolSize);
+                message.Dispose();
+            }
+        }
+    }
+}