mcs/class/System.ComponentModel.Composition/src/ComponentModel/System/ComponentModel/Composition/ReflectionModel/DisposableReflectionComposablePart.cs

   1 \r
   2 // -----------------------------------------------------------------------\r
   3 // Copyright (c) Microsoft Corporation.  All rights reserved.\r
   4 // -----------------------------------------------------------------------\r
   5 using System;\r
   6 using System.Collections.Generic;\r
   7 using System.ComponentModel.Composition.Hosting;\r
   8 using System.ComponentModel.Composition.Primitives;\r
   9 using System.Diagnostics.CodeAnalysis;\r
  10 using System.Globalization;\r
  11 using System.Linq;\r
  12 using System.Reflection;\r
  13 using Microsoft.Internal;\r
  14 using Microsoft.Internal.Collections;\r
  15 using System.Threading;\r
  16 \r
  17 namespace System.ComponentModel.Composition.ReflectionModel\r
  18 {\r
  19     internal sealed class DisposableReflectionComposablePart : ReflectionComposablePart, IDisposable\r
  20     {\r
  21         private volatile int _isDisposed = 0;\r
  22 \r
  23         public DisposableReflectionComposablePart(ReflectionComposablePartDefinition definition)\r
  24             : base(definition)\r
  25         {\r
  26         }\r
  27 \r
  28         protected override void ReleaseInstanceIfNecessary(object instance)\r
  29         {\r
  30             IDisposable disposable = instance as IDisposable;\r
  31             if (disposable != null)\r
  32             {\r
  33                 disposable.Dispose();\r
  34             }\r
  35         }\r
  36 \r
  37         protected override void EnsureRunning()\r
  38         {\r
  39             base.EnsureRunning();\r
  40             if (this._isDisposed == 1)\r
  41             {\r
  42                 throw ExceptionBuilder.CreateObjectDisposed(this);\r
  43             }\r
  44         }\r
  45 \r
  46         void IDisposable.Dispose()\r
  47         {\r
  48             // NOTE : According to http://msdn.microsoft.com/en-us/library/4bw5ewxy.aspx, the warning is bogus when used with Interlocked API.\r
  49 #pragma warning disable 420\r
  50             if (Interlocked.CompareExchange(ref this._isDisposed, 1, 0) == 0)\r
  51 #pragma warning restore 420\r
  52             {\r
  53                 this.ReleaseInstanceIfNecessary(this.CachedInstance);\r
  54             }\r
  55         }\r
  56     }\r
  57 }\r