mcs/class/corlib/System.Threading.Tasks/TaskCompletionSource.cs

   1 //
   2 // TaskCompletionSource.cs
   3 //
   4 // Authors:
   5 //       Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
   6 //       Marek Safar <marek.safar@gmail.com>
   7 //
   8 // Copyright (c) 2009 Jérémie "Garuma" Laval
   9 // Copyright 2011 Xamarin, Inc (http://www.xamarin.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining a copy
  12 // of this software and associated documentation files (the "Software"), to deal
  13 // in the Software without restriction, including without limitation the rights
  14 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  15 // copies of the Software, and to permit persons to whom the Software is
  16 // furnished to do so, subject to the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be included in
  19 // all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  22 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  24 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  25 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  26 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  27 // THE SOFTWARE.
  28
  29 #if NET_4_0
  30 using System;
  31 using System.Collections.Generic;
  32
  33 namespace System.Threading.Tasks
  34 {
  35         public class TaskCompletionSource<TResult>
  36         {
  37                 readonly Task<TResult> source;
  38
  39                 public TaskCompletionSource ()
  40                         : this (null, TaskCreationOptions.None)
  41                 {
  42                 }
  43
  44                 public TaskCompletionSource (object state)
  45                         : this (state, TaskCreationOptions.None)
  46                 {
  47                 }
  48
  49                 public TaskCompletionSource (TaskCreationOptions creationOptions)
  50                         : this (null, creationOptions)
  51                 {
  52                 }
  53
  54                 public TaskCompletionSource (object state, TaskCreationOptions creationOptions)
  55                 {
  56                         if ((creationOptions & System.Threading.Tasks.Task.WorkerTaskNotSupportedOptions) != 0)
  57                                 throw new ArgumentOutOfRangeException ("creationOptions");
  58
  59                         source = new Task<TResult> (TaskActionInvoker.Empty, state, CancellationToken.None, creationOptions, null);
  60                         source.SetupScheduler (TaskScheduler.Current);
  61                 }
  62
  63                 public void SetCanceled ()
  64                 {
  65                         if (!TrySetCanceled ())
  66                                 ThrowInvalidException ();
  67                 }
  68
  69                 public void SetException (Exception exception)
  70                 {
  71                         if (exception == null)
  72                                 throw new ArgumentNullException ("exception");
  73
  74                         SetException (new Exception[] { exception });
  75                 }
  76
  77                 public void SetException (IEnumerable<Exception> exceptions)
  78                 {
  79                         if (!TrySetException (exceptions))
  80                                 ThrowInvalidException ();
  81                 }
  82
  83                 public void SetResult (TResult result)
  84                 {
  85                         if (!TrySetResult (result))
  86                                 ThrowInvalidException ();
  87                 }
  88
  89                 static void ThrowInvalidException ()
  90                 {
  91                         throw new InvalidOperationException ("The underlying Task is already in one of the three final states: RanToCompletion, Faulted, or Canceled.");
  92                 }
  93
  94                 public bool TrySetCanceled ()
  95                 {
  96                         return source.TrySetCanceled ();
  97                 }
  98
  99                 public bool TrySetException (Exception exception)
 100                 {
 101                         if (exception == null)
 102                                 throw new ArgumentNullException ("exception");
 103
 104                         return TrySetException (new Exception[] { exception });
 105                 }
 106
 107                 public bool TrySetException (IEnumerable<Exception> exceptions)
 108                 {
 109                         if (exceptions == null)
 110                                 throw new ArgumentNullException ("exceptions");
 111
 112                         var aggregate = new AggregateException (exceptions);
 113                         if (aggregate.InnerExceptions.Count == 0)
 114                                 throw new ArgumentNullException ("exceptions");
 115
 116                         return source.TrySetException (aggregate, false, false);
 117                 }
 118
 119                 public bool TrySetResult (TResult result)
 120                 {
 121                         return source.TrySetResult (result);
 122                 }
 123
 124                 public Task<TResult> Task {
 125                         get {
 126                                 return source;
 127                         }
 128                 }
 129         }
 130 }
 131 #endif