mcs/class/System.Runtime.Remoting/System.Runtime.Remoting.Channels.Http/HttpRemotingHandlerFactory.cs

   1 //
   2 // System.Runtime.Remoting.Channels.Http.HttpRemotingHandlerFactory
   3 //
   4 // Authors:
   5 //      Martin Willemoes Hansen (mwh@sysrq.dk)
   6 //      Lluis Sanchez Gual (lluis@ximian.com)
   7 //
   8 // (C) 2003 Martin Willemoes Hansen
   9 //
  10
  11 using System.Web;
  12 using System.IO;
  13 using System.Runtime.Remoting;
  14 using System.Runtime.Remoting.Channels;
  15
  16 namespace System.Runtime.Remoting.Channels.Http
  17 {
  18         public class HttpRemotingHandlerFactory : IHttpHandlerFactory
  19         {
  20                 static bool webConfigLoaded = false;
  21                 static HttpServerTransportSink transportSink = null;
  22
  23                 public HttpRemotingHandlerFactory ()
  24                 {
  25                 }
  26
  27                 public IHttpHandler GetHandler (HttpContext context,
  28                                                 string verb,
  29                                                 string url,
  30                                                 string filePath)
  31                 {
  32                         if (!webConfigLoaded)
  33                                 ConfigureHttpChannel (context);
  34
  35                         return new HttpRemotingHandler (transportSink);
  36                 }
  37
  38                 void ConfigureHttpChannel (HttpContext context)
  39                 {
  40                         lock (GetType())
  41                         {
  42                                 if (webConfigLoaded) return;
  43
  44                                 // Look for a channel that wants to receive http request
  45
  46                                 foreach (IChannel channel in ChannelServices.RegisteredChannels)
  47                                 {
  48                                         IChannelReceiverHook chook = channel as IChannelReceiverHook;
  49                                         if (chook == null) continue;
  50
  51                                         if (chook.ChannelScheme != "http")
  52                                                 throw new RemotingException ("Only http channels are allowed when hosting remoting objects in a web server");
  53
  54                                         if (!chook.WantsToListen) continue;
  55
  56                                         // Register the uri for the channel. The channel uri includes the scheme, the
  57                                         // host and the application path
  58
  59                                         string channelUrl = context.Request.Url.GetLeftPart(UriPartial.Authority);
  60                                         channelUrl += context.Request.ApplicationPath;
  61                                         chook.AddHookChannelUri (channelUrl);
  62
  63                                         transportSink = new HttpServerTransportSink (chook.ChannelSinkChain, null);
  64                                 }
  65                                 webConfigLoaded = true;
  66                         }
  67                 }
  68
  69                 public void ReleaseHandler (IHttpHandler handler)
  70                 {
  71                 }
  72         }
  73 }