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                 public bool AsyncWriteAll;
  55
  56                 public WebAsyncResult (AsyncCallback cb, object state)
  57                 {
  58                         this.cb = cb;
  59                         this.state = state;
  60                 }
  61
  62                 public WebAsyncResult (HttpWebRequest request, AsyncCallback cb, object state)
  63                 {
  64                         this.cb = cb;
  65                         this.state = state;
  66                 }
  67
  68                 public WebAsyncResult (AsyncCallback cb, object state, byte [] buffer, int offset, int size)
  69                 {
  70                         this.cb = cb;
  71                         this.state = state;
  72                         this.buffer = buffer;
  73                         this.offset = offset;
  74                         this.size = size;
  75                 }
  76
  77                 internal void SetCompleted (bool synch, Exception e)
  78                 {
  79                         this.synch = synch;
  80                         exc = e;
  81                         lock (locker) {
  82                                 isCompleted = true;
  83                                 if (handle != null)
  84                                         handle.Set ();
  85                         }
  86                 }
  87
  88                 internal void Reset ()
  89                 {
  90                         callbackDone = false;
  91                         exc = null;
  92                         response = null;
  93                         writeStream = null;
  94                         exc = null;
  95                         lock (locker) {
  96                                 isCompleted = false;
  97                                 if (handle != null)
  98                                         handle.Reset ();
  99                         }
 100                 }
 101
 102                 internal void SetCompleted (bool synch, int nbytes)
 103                 {
 104                         this.synch = synch;
 105                         this.nbytes = nbytes;
 106                         exc = null;
 107                         lock (locker) {
 108                                 isCompleted = true;
 109                                 if (handle != null)
 110                                         handle.Set ();
 111                         }
 112                 }
 113
 114                 internal void SetCompleted (bool synch, Stream writeStream)
 115                 {
 116                         this.synch = synch;
 117                         this.writeStream = writeStream;
 118                         exc = null;
 119                         lock (locker) {
 120                                 isCompleted = true;
 121                                 if (handle != null)
 122                                         handle.Set ();
 123                         }
 124                 }
 125
 126                 internal void SetCompleted (bool synch, HttpWebResponse response)
 127                 {
 128                         this.synch = synch;
 129                         this.response = response;
 130                         exc = null;
 131                         lock (locker) {
 132                                 isCompleted = true;
 133                                 if (handle != null)
 134                                         handle.Set ();
 135                         }
 136                 }
 137
 138                 internal void DoCallback ()
 139                 {
 140                         if (!callbackDone && cb != null) {
 141                                 callbackDone = true;
 142                                 if (synch)
 143                                         cb (this);
 144                                 else
 145                                         ThreadPool.QueueUserWorkItem (CB, null);
 146                         }
 147                 }
 148
 149                 void CB (object unused)
 150                 {
 151                         cb (this);
 152                 }
 153
 154                 internal void WaitUntilComplete ()
 155                 {
 156                         if (IsCompleted)
 157                                 return;
 158
 159                         AsyncWaitHandle.WaitOne ();
 160                 }
 161
 162                 internal bool WaitUntilComplete (int timeout, bool exitContext)
 163                 {
 164                         if (IsCompleted)
 165                                 return true;
 166
 167                         return AsyncWaitHandle.WaitOne (timeout, exitContext);
 168                 }
 169
 170                 public object AsyncState {
 171                         get { return state; }
 172                 }
 173
 174                 public WaitHandle AsyncWaitHandle {
 175                         get {
 176                                 lock (locker) {
 177                                         if (handle == null)
 178                                                 handle = new ManualResetEvent (isCompleted);
 179                                 }
 180
 181                                 return handle;
 182                         }
 183                 }
 184
 185                 public bool CompletedSynchronously {
 186                         get { return synch; }
 187                 }
 188
 189                 public bool IsCompleted {
 190                         get {
 191                                 lock (locker) {
 192                                         return isCompleted;
 193                                 }
 194                         }
 195                 }
 196
 197                 internal bool GotException {
 198                         get { return (exc != null); }
 199                 }
 200
 201                 internal Exception Exception {
 202                         get { return exc; }
 203                 }
 204
 205                 internal int NBytes {
 206                         get { return nbytes; }
 207                         set { nbytes = value; }
 208                 }
 209
 210                 internal IAsyncResult InnerAsyncResult {
 211                         get { return innerAsyncResult; }
 212                         set { innerAsyncResult = value; }
 213                 }
 214
 215                 internal Stream WriteStream {
 216                         get { return writeStream; }
 217                 }
 218
 219                 internal HttpWebResponse Response {
 220                         get { return response; }
 221                 }
 222
 223                 internal byte [] Buffer {
 224                         get { return buffer; }
 225                 }
 226
 227                 internal int Offset {
 228                         get { return offset; }
 229                 }
 230
 231                 internal int Size {
 232                         get { return size; }
 233                 }
 234         }
 235 }
 236