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 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.IO;
  32 using System.Threading;
  33
  34 namespace System.Net
  35 {
  36         class WebAsyncResult : IAsyncResult
  37         {
  38                 ManualResetEvent handle;
  39                 bool synch;
  40                 bool isCompleted;
  41                 AsyncCallback cb;
  42                 object state;
  43                 int nbytes;
  44                 IAsyncResult innerAsyncResult;
  45                 bool callbackDone;
  46                 Exception exc;
  47                 HttpWebResponse response;
  48                 Stream writeStream;
  49                 byte [] buffer;
  50                 int offset;
  51                 int size;
  52                 object locker = new object ();
  53                 public bool EndCalled;
  54
  55                 public WebAsyncResult (AsyncCallback cb, object state)
  56                 {
  57                         this.cb = cb;
  58                         this.state = state;
  59                 }
  60
  61                 public WebAsyncResult (HttpWebRequest request, AsyncCallback cb, object state)
  62                 {
  63                         this.cb = cb;
  64                         this.state = state;
  65                 }
  66
  67                 public WebAsyncResult (AsyncCallback cb, object state, byte [] buffer, int offset, int size)
  68                 {
  69                         this.cb = cb;
  70                         this.state = state;
  71                         this.buffer = buffer;
  72                         this.offset = offset;
  73                         this.size = size;
  74                 }
  75
  76                 internal void SetCompleted (bool synch, Exception e)
  77                 {
  78                         this.synch = synch;
  79                         exc = e;
  80                         lock (locker) {
  81                                 isCompleted = true;
  82                                 if (handle != null)
  83                                         handle.Set ();
  84                         }
  85                 }
  86
  87                 internal void Reset ()
  88                 {
  89                         callbackDone = false;
  90                         exc = null;
  91                         response = null;
  92                         writeStream = null;
  93                         exc = null;
  94                         lock (locker) {
  95                                 isCompleted = false;
  96                                 if (handle != null)
  97                                         handle.Reset ();
  98                         }
  99                 }
 100
 101                 internal void SetCompleted (bool synch, int nbytes)
 102                 {
 103                         this.synch = synch;
 104                         this.nbytes = nbytes;
 105                         exc = null;
 106                         lock (locker) {
 107                                 isCompleted = true;
 108                                 if (handle != null)
 109                                         handle.Set ();
 110                         }
 111                 }
 112
 113                 internal void SetCompleted (bool synch, Stream writeStream)
 114                 {
 115                         this.synch = synch;
 116                         this.writeStream = writeStream;
 117                         exc = null;
 118                         lock (locker) {
 119                                 isCompleted = true;
 120                                 if (handle != null)
 121                                         handle.Set ();
 122                         }
 123                 }
 124
 125                 internal void SetCompleted (bool synch, HttpWebResponse response)
 126                 {
 127                         this.synch = synch;
 128                         this.response = response;
 129                         exc = null;
 130                         lock (locker) {
 131                                 isCompleted = true;
 132                                 if (handle != null)
 133                                         handle.Set ();
 134                         }
 135                 }
 136
 137                 internal void DoCallback ()
 138                 {
 139                         if (!callbackDone && cb != null) {
 140                                 callbackDone = true;
 141                                 cb (this);
 142                         }
 143                 }
 144
 145                 internal void WaitUntilComplete ()
 146                 {
 147                         if (IsCompleted)
 148                                 return;
 149
 150                         AsyncWaitHandle.WaitOne ();
 151                 }
 152
 153                 internal bool WaitUntilComplete (int timeout, bool exitContext)
 154                 {
 155                         if (IsCompleted)
 156                                 return true;
 157
 158                         return AsyncWaitHandle.WaitOne (timeout, exitContext);
 159                 }
 160
 161                 public object AsyncState {
 162                         get { return state; }
 163                 }
 164
 165                 public WaitHandle AsyncWaitHandle {
 166                         get {
 167                                 lock (locker) {
 168                                         if (handle == null)
 169                                                 handle = new ManualResetEvent (isCompleted);
 170                                 }
 171
 172                                 return handle;
 173                         }
 174                 }
 175
 176                 public bool CompletedSynchronously {
 177                         get { return synch; }
 178                 }
 179
 180                 public bool IsCompleted {
 181                         get {
 182                                 lock (locker) {
 183                                         return isCompleted;
 184                                 }
 185                         }
 186                 }
 187
 188                 internal bool GotException {
 189                         get { return (exc != null); }
 190                 }
 191
 192                 internal Exception Exception {
 193                         get { return exc; }
 194                 }
 195
 196                 internal int NBytes {
 197                         get { return nbytes; }
 198                         set { nbytes = value; }
 199                 }
 200
 201                 internal IAsyncResult InnerAsyncResult {
 202                         get { return innerAsyncResult; }
 203                         set { innerAsyncResult = value; }
 204                 }
 205
 206                 internal Stream WriteStream {
 207                         get { return writeStream; }
 208                 }
 209
 210                 internal HttpWebResponse Response {
 211                         get { return response; }
 212                 }
 213
 214                 internal byte [] Buffer {
 215                         get { return buffer; }
 216                 }
 217
 218                 internal int Offset {
 219                         get { return offset; }
 220                 }
 221
 222                 internal int Size {
 223                         get { return size; }
 224                 }
 225         }
 226 }
 227