98 lines
2.5 KiB
C#
98 lines
2.5 KiB
C#
//
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// AsyncOperation.cs
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//
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// Authors:
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// Atsushi Enomoto <atsushi@ximian.com>
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//
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// Copyright (C) 2006 Novell, Inc.
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Threading;
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namespace System.ComponentModel
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{
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public sealed class AsyncOperation
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{
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internal AsyncOperation (SynchronizationContext ctx,
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object state)
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{
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this.ctx = ctx;
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this.state = state;
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ctx.OperationStarted ();
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}
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~AsyncOperation ()
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{
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if (!done && ctx != null)
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ctx.OperationCompleted ();
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}
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SynchronizationContext ctx;
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object state;
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bool done;
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public SynchronizationContext SynchronizationContext {
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get { return ctx; }
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}
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public object UserSuppliedState {
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get { return state; }
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}
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public void OperationCompleted ()
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{
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if (done)
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throw new InvalidOperationException ("This task is already completed. Multiple call to OperationCompleted is not allowed.");
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ctx.OperationCompleted ();
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done = true;
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}
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public void Post (SendOrPostCallback d, object arg)
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{
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if (d == null)
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throw new ArgumentNullException ("d");
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if (done)
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throw new InvalidOperationException ("This task is already completed. Multiple call to Post is not allowed.");
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ctx.Post (d, arg);
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}
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public void PostOperationCompleted (
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SendOrPostCallback d, object arg)
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{
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if (d == null)
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throw new ArgumentNullException ("d");
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if (done)
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throw new InvalidOperationException ("This task is already completed. Multiple call to PostOperationCompleted is not allowed.");
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Post (d, arg);
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OperationCompleted ();
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}
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}
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}
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