mcs/class/corlib/System.Runtime.Remoting.Channels/ClientChannelSinkStack.cs

   1 //
   2 // System.Runtime.Remoting.Channels.ClientChannelSinkStack.cs
   3 //
   4 // Author: Rodrigo Moya (rodrigo@ximian.com)
   5 //         Lluis Sanchez (lsg@ctv.es)
   6 //
   7 // 2002 (C) Copyright, Ximian, Inc.
   8 //
   9
  10 //
  11 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System.IO;
  34 using System.Runtime.Remoting.Messaging;
  35
  36 namespace System.Runtime.Remoting.Channels
  37 {
  38 #if NET_2_0
  39         [System.Runtime.InteropServices.ComVisible (true)]
  40 #endif
  41         public class ClientChannelSinkStack : IClientChannelSinkStack, IClientResponseChannelSinkStack
  42         {
  43                 // The sink where to send the result of the async call
  44                 private IMessageSink _replySink = null;
  45
  46                 // The stack. It is a chain of ChanelSinkStackEntry.
  47                 ChanelSinkStackEntry _sinkStack = null;
  48
  49                 public ClientChannelSinkStack ()
  50                 {
  51                 }
  52
  53                 public ClientChannelSinkStack (IMessageSink replySink)
  54                 {
  55                         _replySink = replySink;
  56                 }
  57
  58                 public void AsyncProcessResponse (ITransportHeaders headers, Stream stream)
  59                 {
  60                         if (_sinkStack == null) throw new RemotingException ("The current sink stack is empty");
  61
  62                         ChanelSinkStackEntry stackEntry = _sinkStack;
  63                         _sinkStack = _sinkStack.Next;
  64
  65                         ((IClientChannelSink)stackEntry.Sink).AsyncProcessResponse (this, stackEntry.State, headers, stream);
  66
  67                         // Do not call AsyncProcessResponse for each sink in the stack.
  68                         // The sink must recursively call IClientChannelSinkStack.AsyncProcessResponse
  69                         // after its own processing
  70                 }
  71
  72                 public void DispatchException (Exception e)
  73                 {
  74                         DispatchReplyMessage (new ReturnMessage (e, null));
  75                 }
  76
  77                 public void DispatchReplyMessage (IMessage msg)
  78                 {
  79                         if (_replySink != null) _replySink.SyncProcessMessage(msg);
  80                 }
  81
  82                 public object Pop (IClientChannelSink sink)
  83                 {
  84                         // Pops until the sink is found
  85
  86                         while (_sinkStack != null)
  87                         {
  88                                 ChanelSinkStackEntry stackEntry = _sinkStack;
  89                                 _sinkStack = _sinkStack.Next;
  90                                 if (stackEntry.Sink == sink) return stackEntry.State;
  91                         }
  92                         throw new RemotingException ("The current sink stack is empty, or the specified sink was never pushed onto the current stack");
  93                 }
  94
  95                 public void Push (IClientChannelSink sink, object state)
  96                 {
  97                         _sinkStack = new ChanelSinkStackEntry (sink, state, _sinkStack);
  98                 }
  99         }
 100 }