2 // TaskCompletionSource.cs
5 // Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
7 // Copyright (c) 2009 Jérémie "Garuma" Laval
9 // Permission is hereby granted, free of charge, to any person obtaining a copy
10 // of this software and associated documentation files (the "Software"), to deal
11 // in the Software without restriction, including without limitation the rights
12 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13 // copies of the Software, and to permit persons to whom the Software is
14 // furnished to do so, subject to the following conditions:
16 // The above copyright notice and this permission notice shall be included in
17 // all copies or substantial portions of the Software.
19 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
22 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
29 using System.Collections.Generic;
31 namespace System.Threading.Tasks
33 public class TaskCompletionSource<TResult>
37 public TaskCompletionSource ()
39 source = new Task<TResult> (null);
42 public TaskCompletionSource (object state)
44 source = new Task<TResult> (null, state);
47 public TaskCompletionSource (TaskCreationOptions options)
49 source = new Task<TResult> (null, options);
52 public TaskCompletionSource (object state, TaskCreationOptions options)
54 source = new Task<TResult> (null, state, options);
57 public void SetCanceled ()
59 if (!ApplyOperation (TaskStatus.Canceled, source.CancelReal))
60 ThrowInvalidException ();
63 public void SetException (Exception e)
65 SetException (new Exception[] { e });
68 public void SetException (IEnumerable<Exception> e)
70 if (!ApplyOperation (TaskStatus.Faulted, () => source.Exception = new AggregateException (e)))
71 ThrowInvalidException ();
74 public void SetResult (TResult result)
76 if (!ApplyOperation (TaskStatus.RanToCompletion, () => source.Result = result))
77 ThrowInvalidException ();
80 void ThrowInvalidException ()
82 throw new InvalidOperationException ("The underlying Task is already in one of the three final states: RanToCompletion, Faulted, or Canceled.");
85 public bool TrySetCanceled ()
87 return ApplyOperation (TaskStatus.Canceled, source.CancelReal);
90 public bool TrySetException (Exception e)
92 return TrySetException (new Exception[] { e });
96 public bool TrySetException (IEnumerable<Exception> e)
98 return ApplyOperation (TaskStatus.Faulted, () => source.Exception = new AggregateException (e));
101 public bool TrySetResult (TResult result)
103 return ApplyOperation (TaskStatus.RanToCompletion, () => source.Result = result);
106 bool ApplyOperation (TaskStatus newStatus, Action action)
108 if (CheckInvalidState ())
113 source.Status = newStatus;
118 bool CheckInvalidState ()
120 return source.Status == TaskStatus.RanToCompletion ||
121 source.Status == TaskStatus.Faulted ||
122 source.Status == TaskStatus.Canceled;
126 public Task<TResult> Task {