mcs/class/System/System.Net/WebAsyncResult.cs

   1 //
   2 // System.Net.WebAsyncResult
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //
   7 // (C) 2003 Ximian, Inc (http://www.ximian.com)
   8 //
   9
  10 using System.IO;
  11 using System.Threading;
  12
  13 namespace System.Net
  14 {
  15         class WebAsyncResult : IAsyncResult
  16         {
  17                 ManualResetEvent handle;
  18                 bool synch;
  19                 bool isCompleted;
  20                 AsyncCallback cb;
  21                 object state;
  22                 int nbytes;
  23                 IAsyncResult innerAsyncResult;
  24                 bool callbackDone;
  25                 Exception exc;
  26                 HttpWebRequest request;
  27                 HttpWebResponse response;
  28                 Stream writeStream;
  29                 byte [] buffer;
  30                 int offset;
  31                 int size;
  32
  33                 public WebAsyncResult (AsyncCallback cb, object state)
  34                 {
  35                         this.cb = cb;
  36                         this.state = state;
  37                 }
  38
  39                 public WebAsyncResult (HttpWebRequest request, AsyncCallback cb, object state)
  40                 {
  41                         this.request = request;
  42                         this.cb = cb;
  43                         this.state = state;
  44                 }
  45
  46                 public WebAsyncResult (AsyncCallback cb, object state, byte [] buffer, int offset, int size)
  47                 {
  48                         this.cb = cb;
  49                         this.state = state;
  50                         this.buffer = buffer;
  51                         this.offset = offset;
  52                         this.size = size;
  53                 }
  54
  55                 internal void SetCompleted (bool synch, Exception e)
  56                 {
  57                         isCompleted = true;
  58                         this.synch = synch;
  59                         exc = e;
  60                         ((ManualResetEvent) AsyncWaitHandle).Set ();
  61                 }
  62
  63                 internal void Reset ()
  64                 {
  65                         isCompleted = false;
  66                         callbackDone = false;
  67                         exc = null;
  68                         request = null;
  69                         response = null;
  70                         writeStream = null;
  71                         exc = null;
  72                         if (handle != null)
  73                                 handle.Reset ();
  74                 }
  75
  76                 internal void SetCompleted (bool synch, int nbytes)
  77                 {
  78                         isCompleted = true;
  79                         this.synch = synch;
  80                         this.nbytes = nbytes;
  81                         exc = null;
  82                         ((ManualResetEvent) AsyncWaitHandle).Set ();
  83                 }
  84
  85                 internal void SetCompleted (bool synch, Stream writeStream)
  86                 {
  87                         isCompleted = true;
  88                         this.synch = synch;
  89                         this.writeStream = writeStream;
  90                         exc = null;
  91                         ((ManualResetEvent) AsyncWaitHandle).Set ();
  92                 }
  93
  94                 internal void SetCompleted (bool synch, HttpWebResponse response)
  95                 {
  96                         isCompleted = true;
  97                         this.synch = synch;
  98                         this.response = response;
  99                         exc = null;
 100                         ((ManualResetEvent) AsyncWaitHandle).Set ();
 101                 }
 102
 103                 internal void DoCallback ()
 104                 {
 105                         if (!callbackDone && cb != null) {
 106                                 callbackDone = true;
 107                                 cb (this);
 108                         }
 109                 }
 110
 111                 internal void WaitUntilComplete ()
 112                 {
 113                         if (isCompleted)
 114                                 return;
 115
 116                         AsyncWaitHandle.WaitOne ();
 117                 }
 118
 119                 internal bool WaitUntilComplete (int timeout, bool exitContext)
 120                 {
 121                         if (isCompleted)
 122                                 return true;
 123
 124                         return AsyncWaitHandle.WaitOne (timeout, exitContext);
 125                 }
 126
 127                 public object AsyncState {
 128                         get { return state; }
 129                 }
 130
 131                 public WaitHandle AsyncWaitHandle {
 132                         get {
 133                                 if (handle == null) {
 134                                         lock (this) {
 135                                                 if (handle == null)
 136                                                         handle = new ManualResetEvent (isCompleted);
 137                                         }
 138                                 }
 139
 140                                 return handle;
 141                         }
 142                 }
 143
 144                 public bool CompletedSynchronously {
 145                         get { return synch; }
 146                 }
 147
 148                 public bool IsCompleted {
 149                         get { return isCompleted; }
 150                 }
 151
 152                 internal bool GotException {
 153                         get { return (exc != null); }
 154                 }
 155
 156                 internal Exception Exception {
 157                         get { return exc; }
 158                 }
 159
 160                 internal int NBytes {
 161                         get { return nbytes; }
 162                         set { nbytes = value; }
 163                 }
 164
 165                 internal IAsyncResult InnerAsyncResult {
 166                         get { return innerAsyncResult; }
 167                         set { innerAsyncResult = value; }
 168                 }
 169
 170                 internal Stream WriteStream {
 171                         get { return writeStream; }
 172                 }
 173
 174                 internal HttpWebResponse Response {
 175                         get { return response; }
 176                 }
 177
 178                 internal byte [] Buffer {
 179                         get { return buffer; }
 180                 }
 181
 182                 internal int Offset {
 183                         get { return offset; }
 184                 }
 185
 186                 internal int Size {
 187                         get { return size; }
 188                 }
 189         }
 190 }
 191