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.Close ();
  74                                 handle = null;
  75                         }
  76                 }
  77
  78                 internal void SetCompleted (bool synch, int nbytes)
  79                 {
  80                         isCompleted = true;
  81                         this.synch = synch;
  82                         this.nbytes = nbytes;
  83                         exc = null;
  84                         ((ManualResetEvent) AsyncWaitHandle).Set ();
  85                 }
  86
  87                 internal void SetCompleted (bool synch, Stream writeStream)
  88                 {
  89                         isCompleted = true;
  90                         this.synch = synch;
  91                         this.writeStream = writeStream;
  92                         exc = null;
  93                         ((ManualResetEvent) AsyncWaitHandle).Set ();
  94                 }
  95
  96                 internal void SetCompleted (bool synch, HttpWebResponse response)
  97                 {
  98                         isCompleted = true;
  99                         this.synch = synch;
 100                         this.response = response;
 101                         exc = null;
 102                         ((ManualResetEvent) AsyncWaitHandle).Set ();
 103                 }
 104
 105                 internal void DoCallback ()
 106                 {
 107                         if (!callbackDone && cb != null) {
 108                                 callbackDone = true;
 109                                 cb (this);
 110                         }
 111                 }
 112
 113                 internal void WaitUntilComplete ()
 114                 {
 115                         if (isCompleted)
 116                                 return;
 117
 118                         AsyncWaitHandle.WaitOne ();
 119                 }
 120
 121                 internal bool WaitUntilComplete (int timeout, bool exitContext)
 122                 {
 123                         if (isCompleted)
 124                                 return true;
 125
 126                         return AsyncWaitHandle.WaitOne (timeout, exitContext);
 127                 }
 128
 129                 public object AsyncState {
 130                         get { return state; }
 131                 }
 132
 133                 public WaitHandle AsyncWaitHandle {
 134                         get {
 135                                 if (handle == null) {
 136                                         lock (this) {
 137                                                 if (handle == null)
 138                                                         handle = new ManualResetEvent (isCompleted);
 139                                         }
 140                                 }
 141
 142                                 return handle;
 143                         }
 144                 }
 145
 146                 public bool CompletedSynchronously {
 147                         get { return synch; }
 148                 }
 149
 150                 public bool IsCompleted {
 151                         get { return isCompleted; }
 152                 }
 153
 154                 internal bool GotException {
 155                         get { return (exc != null); }
 156                 }
 157
 158                 internal Exception Exception {
 159                         get { return exc; }
 160                 }
 161
 162                 internal int NBytes {
 163                         get { return nbytes; }
 164                         set { nbytes = value; }
 165                 }
 166
 167                 internal IAsyncResult InnerAsyncResult {
 168                         get { return innerAsyncResult; }
 169                         set { innerAsyncResult = value; }
 170                 }
 171
 172                 internal Stream WriteStream {
 173                         get { return writeStream; }
 174                 }
 175
 176                 internal HttpWebResponse Response {
 177                         get { return response; }
 178                 }
 179
 180                 internal byte [] Buffer {
 181                         get { return buffer; }
 182                 }
 183
 184                 internal int Offset {
 185                         get { return offset; }
 186                 }
 187
 188                 internal int Size {
 189                         get { return size; }
 190                 }
 191         }
 192 }
 193