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                 object locker = new object ();
  33
  34                 public WebAsyncResult (AsyncCallback cb, object state)
  35                 {
  36                         this.cb = cb;
  37                         this.state = state;
  38                 }
  39
  40                 public WebAsyncResult (HttpWebRequest request, AsyncCallback cb, object state)
  41                 {
  42                         this.request = request;
  43                         this.cb = cb;
  44                         this.state = state;
  45                 }
  46
  47                 public WebAsyncResult (AsyncCallback cb, object state, byte [] buffer, int offset, int size)
  48                 {
  49                         this.cb = cb;
  50                         this.state = state;
  51                         this.buffer = buffer;
  52                         this.offset = offset;
  53                         this.size = size;
  54                 }
  55
  56                 internal void SetCompleted (bool synch, Exception e)
  57                 {
  58                         this.synch = synch;
  59                         exc = e;
  60                         lock (locker) {
  61                                 isCompleted = true;
  62                                 if (handle != null)
  63                                         handle.Set ();
  64                         }
  65                 }
  66
  67                 internal void Reset ()
  68                 {
  69                         callbackDone = false;
  70                         exc = null;
  71                         request = null;
  72                         response = null;
  73                         writeStream = null;
  74                         exc = null;
  75                         lock (locker) {
  76                                 isCompleted = false;
  77                                 if (handle != null)
  78                                         handle.Reset ();
  79                         }
  80                 }
  81
  82                 internal void SetCompleted (bool synch, int nbytes)
  83                 {
  84                         this.synch = synch;
  85                         this.nbytes = nbytes;
  86                         exc = null;
  87                         lock (locker) {
  88                                 isCompleted = true;
  89                                 if (handle != null)
  90                                         handle.Set ();
  91                         }
  92                 }
  93
  94                 internal void SetCompleted (bool synch, Stream writeStream)
  95                 {
  96                         this.synch = synch;
  97                         this.writeStream = writeStream;
  98                         exc = null;
  99                         lock (locker) {
 100                                 isCompleted = true;
 101                                 if (handle != null)
 102                                         handle.Set ();
 103                         }
 104                 }
 105
 106                 internal void SetCompleted (bool synch, HttpWebResponse response)
 107                 {
 108                         this.synch = synch;
 109                         this.response = response;
 110                         exc = null;
 111                         lock (locker) {
 112                                 isCompleted = true;
 113                                 if (handle != null)
 114                                         handle.Set ();
 115                         }
 116                 }
 117
 118                 internal void DoCallback ()
 119                 {
 120                         if (!callbackDone && cb != null) {
 121                                 callbackDone = true;
 122                                 cb (this);
 123                         }
 124                 }
 125
 126                 internal void WaitUntilComplete ()
 127                 {
 128                         if (IsCompleted)
 129                                 return;
 130
 131                         AsyncWaitHandle.WaitOne ();
 132                 }
 133
 134                 internal bool WaitUntilComplete (int timeout, bool exitContext)
 135                 {
 136                         if (IsCompleted)
 137                                 return true;
 138
 139                         return AsyncWaitHandle.WaitOne (timeout, exitContext);
 140                 }
 141
 142                 public object AsyncState {
 143                         get { return state; }
 144                 }
 145
 146                 public WaitHandle AsyncWaitHandle {
 147                         get {
 148                                 lock (locker) {
 149                                         if (handle == null)
 150                                                 handle = new ManualResetEvent (isCompleted);
 151                                 }
 152
 153                                 return handle;
 154                         }
 155                 }
 156
 157                 public bool CompletedSynchronously {
 158                         get { return synch; }
 159                 }
 160
 161                 public bool IsCompleted {
 162                         get {
 163                                 lock (locker) {
 164                                         return isCompleted;
 165                                 }
 166                         }
 167                 }
 168
 169                 internal bool GotException {
 170                         get { return (exc != null); }
 171                 }
 172
 173                 internal Exception Exception {
 174                         get { return exc; }
 175                 }
 176
 177                 internal int NBytes {
 178                         get { return nbytes; }
 179                         set { nbytes = value; }
 180                 }
 181
 182                 internal IAsyncResult InnerAsyncResult {
 183                         get { return innerAsyncResult; }
 184                         set { innerAsyncResult = value; }
 185                 }
 186
 187                 internal Stream WriteStream {
 188                         get { return writeStream; }
 189                 }
 190
 191                 internal HttpWebResponse Response {
 192                         get { return response; }
 193                 }
 194
 195                 internal byte [] Buffer {
 196                         get { return buffer; }
 197                 }
 198
 199                 internal int Offset {
 200                         get { return offset; }
 201                 }
 202
 203                 internal int Size {
 204                         get { return size; }
 205                 }
 206         }
 207 }
 208