mcs/class/System/System.Net/DnsAsyncResult.cs

   1 //
   2 // System.Net.DnsAsyncResult
   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 using Mono.Dns;
  34
  35 namespace System.Net
  36 {
  37         class DnsAsyncResult : IAsyncResult
  38         {
  39                 static WaitCallback internal_cb = new WaitCallback (CB);
  40                 ManualResetEvent handle;
  41                 bool synch;
  42                 bool is_completed;
  43                 AsyncCallback callback;
  44                 object state;
  45                 IPHostEntry entry;
  46                 Exception exc;
  47
  48                 public DnsAsyncResult (AsyncCallback cb, object state)
  49                 {
  50                         this.callback = cb;
  51                         this.state = state;
  52                 }
  53
  54                 public void SetCompleted (bool synch, IPHostEntry entry, Exception e)
  55                 {
  56                         this.synch = synch;
  57                         this.entry = entry;
  58                         exc = e;
  59                         lock (this) {
  60                                 if (is_completed)
  61                                         return;
  62                                 is_completed = true;
  63                                 if (handle != null)
  64                                         handle.Set ();
  65                         }
  66                         if (callback != null)
  67                                 ThreadPool.QueueUserWorkItem (internal_cb, this);
  68                 }
  69
  70                 public void SetCompleted (bool synch, Exception e)
  71                 {
  72                         SetCompleted (synch, null, e);
  73                 }
  74
  75                 public void SetCompleted (bool synch, IPHostEntry entry)
  76                 {
  77                         SetCompleted (synch, entry, null);
  78                 }
  79
  80                 static void CB (object _this)
  81                 {
  82                         DnsAsyncResult ares = (DnsAsyncResult) _this;
  83                         ares.callback (ares);
  84                 }
  85
  86                 public object AsyncState {
  87                         get { return state; }
  88                 }
  89
  90                 public WaitHandle AsyncWaitHandle {
  91                         get {
  92                                 lock (this) {
  93                                         if (handle == null)
  94                                                 handle = new ManualResetEvent (is_completed);
  95                                 }
  96                                 return handle;
  97                         }
  98                 }
  99
 100                 public Exception Exception {
 101                         get { return exc; }
 102                 }
 103
 104                 public IPHostEntry HostEntry {
 105                         get { return entry; }
 106                 }
 107
 108                 public bool CompletedSynchronously {
 109                         get { return synch; }
 110                 }
 111
 112                 public bool IsCompleted {
 113                         get {
 114                                 lock (this) {
 115                                         return is_completed;
 116                                 }
 117                         }
 118                 }
 119         }
 120 }
 121