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                 public byte [] Buffer;
  48                 public int Offset;
  49                 public int Count;
  50                 public int OriginalCount;
  51                 public int BytesRead;
  52
  53                 AsyncCallback realcb;
  54
  55                 public FileStreamAsyncResult (AsyncCallback cb, object state)
  56                 {
  57                         this.state = state;
  58                         this.realcb = cb;
  59                         if (realcb != null)
  60                                 this.cb = new AsyncCallback (CBWrapper);
  61                         wh = new ManualResetEvent (false);
  62                 }
  63
  64                 static void CBWrapper (IAsyncResult ares)
  65                 {
  66                         FileStreamAsyncResult res = (FileStreamAsyncResult) ares;
  67                         res.realcb.BeginInvoke (ares, null, null);
  68                 }
  69
  70                 public void SetComplete (Exception e)
  71                 {
  72                         exc = e;
  73                         completed = true;
  74                         wh.Set ();
  75                         if (cb != null)
  76                                 cb (this);
  77                 }
  78
  79                 public void SetComplete (Exception e, int nbytes)
  80                 {
  81                         this.BytesRead = nbytes;
  82                         SetComplete (e);
  83                 }
  84
  85                 public void SetComplete (Exception e, int nbytes, bool synch)
  86                 {
  87                         completedSynch = synch;
  88                         SetComplete (e, nbytes);
  89                 }
  90
  91                 public object AsyncState {
  92                         get { return state; }
  93                 }
  94
  95                 public bool CompletedSynchronously {
  96                         get { return completedSynch; }
  97                 }
  98
  99                 public WaitHandle AsyncWaitHandle {
 100                         get { return wh; }
 101                 }
 102
 103                 public bool IsCompleted {
 104                         get { return completed; }
 105                 }
 106
 107                 public Exception Exception {
 108                         get { return exc; }
 109                 }
 110
 111                 public bool Done {
 112                         get { return done; }
 113                         set { done = value; }
 114                 }
 115         }
 116 }
 117