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

// 
// System.Runtime.Remoting.Messaging/AsyncResult.cs 
//
// Authors:
//   Joe Shaw (joe@ximian.com)
//   Martin Baulig (martin@gnome.org)
//   Dietmar Maurer (dietmar@ximian.com)
//   Duncan Mak (duncan@ximian.com)
//
// (C) 2001 Ximian, Inc.  http://www.ximian.com
// Copyright (C) 2004-2005 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.CompilerServices;

namespace System.Runtime.Remoting.Messaging{

[System.Runtime.InteropServices.ComVisible (true)]
public class AsyncResult : IAsyncResult, IMessageSink {

#pragma warning disable 169, 414, 649
  object async_state;
  WaitHandle handle;
  object async_delegate;
  IntPtr data;
  object object_data;
  bool sync_completed;
  bool completed;
  bool endinvoke_called;
  object async_callback;
  ExecutionContext current;
  ExecutionContext original;
  long add_time;
#pragma warning restore 169, 414, 649

  // not part of MonoAsyncResult...
  MonoMethodMessage call_message;
#pragma warning disable 0414
  IMessageCtrl message_ctrl;
#pragma warning restore
  IMessage reply_message;
  
  internal AsyncResult ()
  {
  }

  internal AsyncResult (WaitCallback cb, object state, bool capture_context)
  {
    async_state = state;
    async_delegate = cb;
    if (capture_context)
      current = ExecutionContext.Capture ();
  }

  public virtual object AsyncState
  {
    get {
      return async_state;
    }
  }

  public virtual WaitHandle AsyncWaitHandle {
    get {
      lock (this) {
        if (handle == null)
          handle = new ManualResetEvent (completed);

        return handle;
      }
    }
  }

  public virtual bool CompletedSynchronously
  {
    get {
      return sync_completed;
    }
  }

  public virtual bool IsCompleted
  {
    get {
      return completed;
    }
  }
    
  public bool EndInvokeCalled
  {
    get {
      return endinvoke_called;
    }
    set {
      endinvoke_called = value;
    }
  }
    
  public virtual object AsyncDelegate
  {
    get {
      return async_delegate;
    }
  }

  public IMessageSink NextSink {
    get {
      return null;
    }
  }

  public virtual IMessageCtrl AsyncProcessMessage (IMessage msg, IMessageSink replySink)
  {
    // Never called
    throw new NotSupportedException ();
  }

  public virtual IMessage GetReplyMessage()
  {
    return reply_message;
  }

  public virtual void SetMessageCtrl (IMessageCtrl mc)
  {
    message_ctrl = mc;
  }

  internal void SetCompletedSynchronously (bool completed)
  {
    sync_completed = completed;
  }

  internal IMessage EndInvoke ()
  {
    lock (this) {
      if (completed)
        return reply_message;
    }

    AsyncWaitHandle.WaitOne ();
    return reply_message;
  }

  public virtual IMessage SyncProcessMessage (IMessage msg)
  {
    reply_message = msg;

    lock (this) {
      completed = true;
      if (handle != null)
        ((ManualResetEvent) AsyncWaitHandle).Set ();
    }
    
    if (async_callback != null) {
      AsyncCallback ac = (AsyncCallback) async_callback;
      ac (this);
    }

    return null;
  }
  
  internal MonoMethodMessage CallMessage
  {
    get { return call_message; }
    set { call_message = value; }
  }
}
}