mcs/class/corlib/System.IO/FileStreamAsyncResult.cs

   1 //
   2 // System.IO/FileStreamAsyncResult.cs
   3 //
   4 // Authors:
   5 //   Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //
   7 // (c) 2004 Novell, Inc. (http://www.novell.com)
   8 //
   9
  10 //
  11 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System.Threading;
  34
  35 namespace System.IO
  36 {
  37         class FileStreamAsyncResult : IAsyncResult {
  38                 /* Same structure in the runtime */
  39                 object state;
  40                 bool completed;
  41                 bool done;
  42                 Exception exc;
  43                 ManualResetEvent wh;
  44                 AsyncCallback cb;
  45                 bool completedSynch;
  46
  47 #pragma warning disable 649
  48                 public byte [] Buffer;
  49                 public int Offset;
  50                 public int Count;
  51                 public int OriginalCount;
  52                 public int BytesRead;
  53 #pragma warning restore 649
  54
  55                 AsyncCallback realcb;
  56
  57                 public FileStreamAsyncResult (AsyncCallback cb, object state)
  58                 {
  59                         this.state = state;
  60                         this.realcb = cb;
  61                         if (realcb != null)
  62                                 this.cb = new AsyncCallback (CBWrapper);
  63                         wh = new ManualResetEvent (false);
  64                 }
  65
  66                 static void CBWrapper (IAsyncResult ares)
  67                 {
  68                         FileStreamAsyncResult res = (FileStreamAsyncResult) ares;
  69                         res.realcb.BeginInvoke (ares, null, null);
  70                 }
  71
  72                 public void SetComplete (Exception e)
  73                 {
  74                         exc = e;
  75                         completed = true;
  76                         wh.Set ();
  77                         if (cb != null)
  78                                 cb (this);
  79                 }
  80
  81                 public void SetComplete (Exception e, int nbytes)
  82                 {
  83                         this.BytesRead = nbytes;
  84                         SetComplete (e);
  85                 }
  86
  87                 public void SetComplete (Exception e, int nbytes, bool synch)
  88                 {
  89                         completedSynch = synch;
  90                         SetComplete (e, nbytes);
  91                 }
  92
  93                 public object AsyncState {
  94                         get { return state; }
  95                 }
  96
  97                 public bool CompletedSynchronously {
  98                         get { return completedSynch; }
  99                 }
 100
 101                 public WaitHandle AsyncWaitHandle {
 102                         get { return wh; }
 103                 }
 104
 105                 public bool IsCompleted {
 106                         get { return completed; }
 107                 }
 108
 109                 public Exception Exception {
 110                         get { return exc; }
 111                 }
 112
 113                 public bool Done {
 114                         get { return done; }
 115                         set { done = value; }
 116                 }
 117         }
 118 }
 119