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//
// AsyncOperation.cs
//
// Authors:
// Atsushi Enomoto <atsushi@ximian.com>
//
// Copyright (C) 2006 Novell, Inc.
//
//
// 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.Threading;
namespace System.ComponentModel
{
public sealed class AsyncOperation
{
internal AsyncOperation (SynchronizationContext ctx,
object state)
{
this.ctx = ctx;
this.state = state;
ctx.OperationStarted ();
}
~AsyncOperation ()
{
if (!done && ctx != null)
ctx.OperationCompleted ();
}
SynchronizationContext ctx;
object state;
bool done;
public SynchronizationContext SynchronizationContext {
get { return ctx; }
}
public object UserSuppliedState {
get { return state; }
}
public void OperationCompleted ()
{
if (done)
throw new InvalidOperationException ("This task is already completed. Multiple call to OperationCompleted is not allowed.");
ctx.OperationCompleted ();
done = true;
}
public void Post (SendOrPostCallback d, object arg)
{
if (d == null)
throw new ArgumentNullException ("d");
if (done)
throw new InvalidOperationException ("This task is already completed. Multiple call to Post is not allowed.");
ctx.Post (d, arg);
}
public void PostOperationCompleted (
SendOrPostCallback d, object arg)
{
if (d == null)
throw new ArgumentNullException ("d");
if (done)
throw new InvalidOperationException ("This task is already completed. Multiple call to PostOperationCompleted is not allowed.");
Post (d, arg);
OperationCompleted ();
}
}
}
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