mcs/class/System.ServiceModel/System.ServiceModel.Channels/SvcHttpHandler.cs

   1 //
   2 // SvcHttpHandler.cs
   3 //
   4 // Author:
   5 //      Ankit Jain  <jankit@novell.com>
   6 //      Atsushi Enomoto <atsushi@ximian.com>
   7 //
   8 // Copyright (C) 2006,2009 Novell, Inc.  http://www.novell.com
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29 using System;
  30 using System.Collections.Generic;
  31 using System.Linq;
  32 using System.Web;
  33 using System.Threading;
  34
  35 using System.ServiceModel;
  36 using System.ServiceModel.Activation;
  37 using System.ServiceModel.Configuration;
  38 using System.ServiceModel.Description;
  39
  40 namespace System.ServiceModel.Channels {
  41
  42         internal class SvcHttpHandler : IHttpHandler
  43         {
  44                 Type type;
  45                 Type factory_type;
  46                 string path;
  47                 Uri request_url;
  48                 ServiceHostBase host;
  49                 Queue<HttpContext> pending = new Queue<HttpContext> ();
  50                 int close_state;
  51
  52                 AutoResetEvent process_request_wait = new AutoResetEvent (false);
  53                 AutoResetEvent listening = new AutoResetEvent (false);
  54
  55                 public SvcHttpHandler (Type type, Type factoryType, string path)
  56                 {
  57                         this.type = type;
  58                         this.factory_type = factoryType;
  59                         this.path = path;
  60                 }
  61
  62                 public bool IsReusable
  63                 {
  64                         get { return true; }
  65                 }
  66
  67                 public ServiceHostBase Host {
  68                         get { return host; }
  69                 }
  70
  71                 public HttpContext WaitForRequest (TimeSpan timeout)
  72                 {
  73                         if (close_state > 0)
  74                                 return null;
  75                         DateTime start = DateTime.Now;
  76
  77                         if (close_state > 0)
  78                                 return null;
  79                         if (pending.Count == 0) {
  80                                 if (!process_request_wait.WaitOne (timeout - (DateTime.Now - start), false) || close_state > 0)
  81                                         return null;
  82                         }
  83                         HttpContext ctx;
  84                         lock (pending) {
  85                                 if (pending.Count == 0)
  86                                         return null;
  87                                 ctx = pending.Dequeue ();
  88                         }
  89                         if (ctx.AllErrors != null && ctx.AllErrors.Length > 0)
  90                                 return WaitForRequest (timeout - (DateTime.Now - start));
  91                         return ctx;
  92                 }
  93
  94                 public void ProcessRequest (HttpContext context)
  95                 {
  96                         request_url = context.Request.Url;
  97                         EnsureServiceHost ();
  98                         pending.Enqueue (context);
  99                         process_request_wait.Set ();
 100
 101                         if (close_state == 0)
 102                                 listening.WaitOne ();
 103                 }
 104
 105                 public void EndRequest (HttpContext context)
 106                 {
 107                         listening.Set ();
 108                 }
 109
 110                 // called from SvcHttpHandlerFactory's remove callback (i.e.
 111                 // unloading asp.net). It closes ServiceHost, then the host
 112                 // in turn closes the listener and the channels it opened.
 113                 // The channel listener calls CloseServiceChannel() to stop
 114                 // accepting further requests on its shutdown.
 115                 public void Close ()
 116                 {
 117                         host.Close ();
 118                         host = null;
 119                 }
 120
 121                 // called from AspNetChannelListener.Close() or .Abort().
 122                 public void CloseServiceChannel ()
 123                 {
 124                         if (close_state > 0)
 125                                 return;
 126                         close_state = 1;
 127                         process_request_wait.Set ();
 128                         listening.Set ();
 129                         close_state = 2;
 130                 }
 131
 132                 void EnsureServiceHost ()
 133                 {
 134                         if (host != null)
 135                                 return;
 136
 137                         //ServiceHost for this not created yet
 138                         var baseUri = new Uri (HttpContext.Current.Request.Url.GetLeftPart (UriPartial.Path));
 139                         if (factory_type != null) {
 140                                 host = ((ServiceHostFactory) Activator.CreateInstance (factory_type)).CreateServiceHost (type, new Uri [] {baseUri});
 141                         }
 142                         else
 143                                 host = new ServiceHost (type, baseUri);
 144                         host.Extensions.Add (new VirtualPathExtension (baseUri.AbsolutePath));
 145
 146                         host.Open ();
 147                 }
 148         }
 149 }