mcs/class/corlib/System.Runtime.Remoting.Contexts/CrossContextChannel.cs

   1 //
   2 // System.Runtime.Remoting.Contexts.CrossContextChannel.cs
   3 //
   4 // Author: Lluis Sanchez Gual (lluis@ideary.com)
   5 //
   6 // (C) 2002, Lluis Sanchez Gual
   7 //
   8
   9 //
  10 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System;
  33 using System.Threading;
  34 using System.Runtime.Remoting.Messaging;
  35 using System.Runtime.Remoting.Activation;
  36 using System.Runtime.Remoting.Channels;
  37
  38 namespace System.Runtime.Remoting.Contexts
  39 {
  40         internal class CrossContextChannel: IMessageSink
  41         {
  42                 public IMessage SyncProcessMessage (IMessage msg)
  43                 {
  44                         ServerIdentity identity = (ServerIdentity) RemotingServices.GetMessageTargetIdentity (msg);
  45
  46                         Context oldContext = null;
  47                         IMessage response;
  48
  49                         if (Threading.Thread.CurrentContext != identity.Context)
  50                                 oldContext = Context.SwitchToContext (identity.Context);
  51
  52                         try
  53                         {
  54                                 Context.NotifyGlobalDynamicSinks (true, msg, false, false);
  55                                 Thread.CurrentContext.NotifyDynamicSinks (true, msg, false, false);
  56
  57                                 response = identity.Context.GetServerContextSinkChain().SyncProcessMessage (msg);
  58
  59                                 Context.NotifyGlobalDynamicSinks (false, msg, false, false);
  60                                 Thread.CurrentContext.NotifyDynamicSinks (false, msg, false, false);
  61                         }
  62                         catch (Exception ex)
  63                         {
  64                                 response = new ReturnMessage (ex, (IMethodCallMessage)msg);
  65                         }
  66                         finally
  67                         {
  68                                 if (oldContext != null)
  69                                         Context.SwitchToContext (oldContext);
  70                         }
  71
  72                         return response;
  73                 }
  74
  75                 public IMessageCtrl AsyncProcessMessage (IMessage msg, IMessageSink replySink)
  76                 {
  77                         ServerIdentity identity = (ServerIdentity) RemotingServices.GetMessageTargetIdentity (msg);
  78
  79                         Context oldContext = null;
  80                         if (Threading.Thread.CurrentContext != identity.Context)
  81                                 oldContext = Context.SwitchToContext (identity.Context);
  82
  83                         try
  84                         {
  85                                 Context.NotifyGlobalDynamicSinks (true, msg, false, true);
  86                                 Thread.CurrentContext.NotifyDynamicSinks (true, msg, false, false);
  87                                 if (replySink != null) replySink = new ContextRestoreSink (replySink, oldContext, msg);
  88
  89                                 IMessageCtrl res = identity.AsyncObjectProcessMessage (msg, replySink);
  90
  91                                 if (replySink == null)
  92                                 {
  93                                         Context.NotifyGlobalDynamicSinks (false, msg, false, false);
  94                                         Thread.CurrentContext.NotifyDynamicSinks (false, msg, false, false);
  95                                 }
  96
  97                                 return res;
  98                         }
  99                         catch (Exception ex)
 100                         {
 101                                 if (replySink != null)
 102                                         replySink.SyncProcessMessage (new ReturnMessage (ex, (IMethodCallMessage)msg));
 103                                 return null;
 104                         }
 105                         finally
 106                         {
 107                                 if (oldContext != null)
 108                                         Context.SwitchToContext (oldContext);
 109                         }
 110                 }
 111
 112                 public IMessageSink NextSink
 113                 {
 114                         get { return null; }
 115                 }
 116
 117                 class ContextRestoreSink: IMessageSink
 118                 {
 119                         IMessageSink _next;
 120                         Context _context;
 121                         IMessage _call;
 122
 123                         public ContextRestoreSink (IMessageSink next, Context context, IMessage call)
 124                         {
 125                                 _next = next;
 126                                 _context = context;
 127                                 _call = call;
 128                         }
 129
 130                         public IMessage SyncProcessMessage (IMessage msg)
 131                         {
 132                                 try
 133                                 {
 134                                         Context.NotifyGlobalDynamicSinks (false, msg, false, false);
 135                                         Thread.CurrentContext.NotifyDynamicSinks (false, msg, false, false);
 136                                         return _next.SyncProcessMessage (msg);
 137                                 }
 138                                 catch (Exception ex)
 139                                 {
 140                                         return new ReturnMessage (ex, (IMethodCallMessage)_call);
 141                                 }
 142                                 finally
 143                                 {
 144                                         if (_context != null)
 145                                                 Context.SwitchToContext (_context);
 146                                 }
 147                         }
 148
 149                         public IMessageCtrl AsyncProcessMessage (IMessage msg, IMessageSink replySink)
 150                         {
 151                                 throw new NotSupportedException();      // Not needed
 152                         }
 153
 154                         public IMessageSink NextSink
 155                         {
 156                                 get { return _next; }
 157                         }
 158                 }
 159
 160         }
 161 }