CrossContextChannel.cs :  » 2.6.4-mono-.net-core » System.Runtime » System » Runtime » Remoting » Contexts » C# / CSharp Open Source

//
// System.Runtime.Remoting.Contexts.CrossContextChannel.cs
//
// Author: Lluis Sanchez Gual (lluis@ideary.com)
//
// (C) 2002, Lluis Sanchez Gual
//

//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Threading;
using System.Runtime.Remoting.Messaging;
using System.Runtime.Remoting.Activation;
using System.Runtime.Remoting.Channels;

namespace System.Runtime.Remoting.Contexts{
  internal class CrossContextChannel: IMessageSink
  {
    public IMessage SyncProcessMessage (IMessage msg)
    {
      ServerIdentity identity = (ServerIdentity) RemotingServices.GetMessageTargetIdentity (msg);

      Context oldContext = null;
      IMessage response;

      if (Threading.Thread.CurrentContext != identity.Context)
        oldContext = Context.SwitchToContext (identity.Context);

      try
      {
        Context.NotifyGlobalDynamicSinks (true, msg, false, false);
        Thread.CurrentContext.NotifyDynamicSinks (true, msg, false, false);

        response = identity.Context.GetServerContextSinkChain().SyncProcessMessage (msg);

        Context.NotifyGlobalDynamicSinks (false, msg, false, false);
        Thread.CurrentContext.NotifyDynamicSinks (false, msg, false, false);
      }
      catch (Exception ex)
      {
        response = new ReturnMessage (ex, (IMethodCallMessage)msg);
      }
      finally
      {
        if (oldContext != null)
          Context.SwitchToContext (oldContext);
      }
      
      return response;
    }

    public IMessageCtrl AsyncProcessMessage (IMessage msg, IMessageSink replySink)
    {
      ServerIdentity identity = (ServerIdentity) RemotingServices.GetMessageTargetIdentity (msg);
      
      Context oldContext = null;
      if (Threading.Thread.CurrentContext != identity.Context)
        oldContext = Context.SwitchToContext (identity.Context);

      try
      {
        Context.NotifyGlobalDynamicSinks (true, msg, false, true);
        Thread.CurrentContext.NotifyDynamicSinks (true, msg, false, false);
        if (replySink != null) replySink = new ContextRestoreSink (replySink, oldContext, msg);

        IMessageCtrl res = identity.AsyncObjectProcessMessage (msg, replySink);

        if (replySink == null)
        {
          Context.NotifyGlobalDynamicSinks (false, msg, false, false);
          Thread.CurrentContext.NotifyDynamicSinks (false, msg, false, false);
        }

        return res;
      }
      catch (Exception ex)
      {
        if (replySink != null)
          replySink.SyncProcessMessage (new ReturnMessage (ex, (IMethodCallMessage)msg));
        return null;
      }
      finally
      {
        if (oldContext != null)
          Context.SwitchToContext (oldContext);
      }
    }

    public IMessageSink NextSink 
    { 
      get { return null; }
    }

    class ContextRestoreSink: IMessageSink
    {
      IMessageSink _next;
      Context _context;
      IMessage _call;

      public ContextRestoreSink (IMessageSink next, Context context, IMessage call)
      {
        _next = next;
        _context = context;
        _call = call;
      }

      public IMessage SyncProcessMessage (IMessage msg)
      {
        try
        {
          Context.NotifyGlobalDynamicSinks (false, msg, false, false);
          Thread.CurrentContext.NotifyDynamicSinks (false, msg, false, false);
          return _next.SyncProcessMessage (msg);
        }
        catch (Exception ex)
        {
          return new ReturnMessage (ex, (IMethodCallMessage)_call);
        }
        finally
        {
          if (_context != null)
            Context.SwitchToContext (_context);
        }    
      }

      public IMessageCtrl AsyncProcessMessage (IMessage msg, IMessageSink replySink)
      {
        throw new NotSupportedException();  // Not needed
      }

      public IMessageSink NextSink 
      { 
        get { return _next; }
      }    
    }

  }
}