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         [System.Runtime.InteropServices.ComVisible (true)]
  39         public class ClientChannelSinkStack : IClientChannelSinkStack, IClientResponseChannelSinkStack
  40         {
  41                 // The sink where to send the result of the async call
  42                 private IMessageSink _replySink = null;
  43
  44                 // The stack. It is a chain of ChanelSinkStackEntry.
  45                 ChanelSinkStackEntry _sinkStack = null;
  46
  47                 public ClientChannelSinkStack ()
  48                 {
  49                 }
  50
  51                 public ClientChannelSinkStack (IMessageSink replySink)
  52                 {
  53                         _replySink = replySink;
  54                 }
  55
  56                 public void AsyncProcessResponse (ITransportHeaders headers, Stream stream)
  57                 {
  58                         if (_sinkStack == null) throw new RemotingException ("The current sink stack is empty");
  59
  60                         ChanelSinkStackEntry stackEntry = _sinkStack;
  61                         _sinkStack = _sinkStack.Next;
  62
  63                         ((IClientChannelSink)stackEntry.Sink).AsyncProcessResponse (this, stackEntry.State, headers, stream);
  64
  65                         // Do not call AsyncProcessResponse for each sink in the stack.
  66                         // The sink must recursively call IClientChannelSinkStack.AsyncProcessResponse
  67                         // after its own processing
  68                 }
  69
  70                 public void DispatchException (Exception e)
  71                 {
  72                         DispatchReplyMessage (new ReturnMessage (e, null));
  73                 }
  74
  75                 public void DispatchReplyMessage (IMessage msg)
  76                 {
  77                         if (_replySink != null) _replySink.SyncProcessMessage(msg);
  78                 }
  79
  80                 public object Pop (IClientChannelSink sink)
  81                 {
  82                         // Pops until the sink is found
  83
  84                         while (_sinkStack != null)
  85                         {
  86                                 ChanelSinkStackEntry stackEntry = _sinkStack;
  87                                 _sinkStack = _sinkStack.Next;
  88                                 if (stackEntry.Sink == sink) return stackEntry.State;
  89                         }
  90                         throw new RemotingException ("The current sink stack is empty, or the specified sink was never pushed onto the current stack");
  91                 }
  92
  93                 public void Push (IClientChannelSink sink, object state)
  94                 {
  95                         _sinkStack = new ChanelSinkStackEntry (sink, state, _sinkStack);
  96                 }
  97         }
  98 }