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//
// TaskCompletionSource.cs
//
// Authors:
// Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
// Marek Safar <marek.safar@gmail.com>
//
// Copyright (c) 2009 Jérémie "Garuma" Laval
// Copyright 2011 Xamarin, Inc (http://www.xamarin.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.
#if NET_4_0
using System;
using System.Collections.Generic;
namespace System.Threading.Tasks
{
public class TaskCompletionSource<TResult>
{
readonly Task<TResult> source;
public TaskCompletionSource ()
: this (null, TaskCreationOptions.None)
{
}
public TaskCompletionSource (object state)
: this (state, TaskCreationOptions.None)
{
}
public TaskCompletionSource (TaskCreationOptions creationOptions)
: this (null, creationOptions)
{
}
public TaskCompletionSource (object state, TaskCreationOptions creationOptions)
{
if ((creationOptions & System.Threading.Tasks.Task.WorkerTaskNotSupportedOptions) != 0)
throw new ArgumentOutOfRangeException ("creationOptions");
source = new Task<TResult> (TaskActionInvoker.Empty, state, CancellationToken.None, creationOptions, null);
source.SetupScheduler (TaskScheduler.Current);
}
public void SetCanceled ()
{
if (!TrySetCanceled ())
ThrowInvalidException ();
}
public void SetException (Exception exception)
{
if (exception == null)
throw new ArgumentNullException ("exception");
SetException (new Exception[] { exception });
}
public void SetException (IEnumerable<Exception> exceptions)
{
if (!TrySetException (exceptions))
ThrowInvalidException ();
}
public void SetResult (TResult result)
{
if (!TrySetResult (result))
ThrowInvalidException ();
}
static void ThrowInvalidException ()
{
throw new InvalidOperationException ("The underlying Task is already in one of the three final states: RanToCompletion, Faulted, or Canceled.");
}
public bool TrySetCanceled ()
{
return source.TrySetCanceled ();
}
public bool TrySetException (Exception exception)
{
if (exception == null)
throw new ArgumentNullException ("exception");
return TrySetException (new Exception[] { exception });
}
public bool TrySetException (IEnumerable<Exception> exceptions)
{
if (exceptions == null)
throw new ArgumentNullException ("exceptions");
var aggregate = new AggregateException (exceptions);
if (aggregate.InnerExceptions.Count == 0)
throw new ArgumentNullException ("exceptions");
return source.TrySetException (aggregate, false, false);
}
public bool TrySetResult (TResult result)
{
return source.TrySetResult (result);
}
public Task<TResult> Task {
get {
return source;
}
}
}
}
#endif
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