2 // System.Web.TaskAsyncResult.cs
5 // Kornel Pal (kornelpal@gmail.com)
7 // Copyright (C) 2014 Kornel Pal
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
29 using System.Threading;
30 using System.Threading.Tasks;
34 sealed class TaskAsyncResult : IAsyncResult
36 static readonly Action<Task, object> invokeCallback = InvokeCallback;
38 readonly AsyncCallback callback;
40 public object AsyncState {
45 public WaitHandle AsyncWaitHandle {
46 get { return ((IAsyncResult) task).AsyncWaitHandle; }
49 public bool CompletedSynchronously {
54 public bool IsCompleted {
55 get { return task.IsCompleted; }
58 TaskAsyncResult (Task task, AsyncCallback callback, object state)
61 this.callback = callback;
62 this.AsyncState = state;
63 this.CompletedSynchronously = task.IsCompleted;
66 public static IAsyncResult GetAsyncResult (Task task, AsyncCallback callback, object state)
71 var result = new TaskAsyncResult (task, callback, state);
73 if (callback != null) {
74 if (result.CompletedSynchronously)
77 task.ContinueWith (invokeCallback, result);
83 public static void Wait (IAsyncResult result)
86 throw new ArgumentNullException ("result");
88 var taskAsyncResult = result as TaskAsyncResult;
89 if (taskAsyncResult == null)
90 throw new ArgumentException ("The provided IAsyncResult is invalid.", "result");
92 taskAsyncResult.task.GetAwaiter ().GetResult ();
95 static void InvokeCallback (Task task, object state)
97 var result = (TaskAsyncResult) state;
98 result.callback (result);