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// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
/*============================================================
**
** Interface: AsyncResult
**
** Purpose: Object to encapsulate the results of an async
** operation
**
===========================================================*/
namespace System.Runtime.Remoting.Messaging {
using System.Threading;
using System.Runtime.Remoting;
using System;
using System.Security.Permissions;
[System.Runtime.InteropServices.ComVisible(true)]
public class AsyncResult : IAsyncResult, IMessageSink
{
[System.Security.SecurityCritical] // auto-generated
internal AsyncResult(Message m)
{
m.GetAsyncBeginInfo(out _acbd, out _asyncState);
_asyncDelegate = (Delegate) m.GetThisPtr();
}
// True if the asynchronous operation has been completed.
public virtual bool IsCompleted
{
get
{
return _isCompleted;
}
}
// The delegate object on which the async call was invoked.
public virtual Object AsyncDelegate
{
get
{
return _asyncDelegate;
}
}
// The state object passed in via BeginInvoke.
public virtual Object AsyncState
{
get
{
return _asyncState;
}
}
public virtual bool CompletedSynchronously
{
get
{
return false;
}
}
public bool EndInvokeCalled
{
get
{
return _endInvokeCalled;
}
set
{
BCLDebug.Assert(!_endInvokeCalled && value,
"EndInvoke prevents multiple calls");
_endInvokeCalled = value;
}
}
private void FaultInWaitHandle()
{
lock(this) {
if (_AsyncWaitHandle == null)
{
_AsyncWaitHandle = new ManualResetEvent(false);
}
}
}
public virtual WaitHandle AsyncWaitHandle
{
get
{
FaultInWaitHandle();
return _AsyncWaitHandle;
}
}
public virtual void SetMessageCtrl(IMessageCtrl mc)
{
_mc = mc;
}
[System.Security.SecurityCritical] // auto-generated_required
public virtual IMessage SyncProcessMessage(IMessage msg)
{
if (msg == null)
{
_replyMsg = new ReturnMessage(new RemotingException(Environment.GetResourceString("Remoting_NullMessage")), new ErrorMessage());
}
else if (!(msg is IMethodReturnMessage))
{
_replyMsg = new ReturnMessage(new RemotingException(Environment.GetResourceString("Remoting_Message_BadType")), new ErrorMessage());
}
else
{
_replyMsg = msg;
}
_isCompleted = true;
FaultInWaitHandle();
_AsyncWaitHandle.Set();
if (_acbd != null)
{
// NOTE: We are invoking user code here!
// Catch and Ignore exceptions thrown from async callback user code.
_acbd(this);
}
return null;
}
[System.Security.SecurityCritical] // auto-generated_required
public virtual IMessageCtrl AsyncProcessMessage(IMessage msg, IMessageSink replySink)
{
throw new NotSupportedException(
Environment.GetResourceString("NotSupported_Method"));
}
public IMessageSink NextSink
{
[System.Security.SecurityCritical] // auto-generated_required
get
{
return null;
}
}
public virtual IMessage GetReplyMessage() {return _replyMsg;}
private IMessageCtrl _mc;
private AsyncCallback _acbd;
private IMessage _replyMsg;
private bool _isCompleted;
private bool _endInvokeCalled;
private ManualResetEvent _AsyncWaitHandle;
private Delegate _asyncDelegate;
private Object _asyncState;
}
}
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