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

   1 #if NET_4_0 || BOOTSTRAP_NET_4_0
   2 // Future.cs
   3 //
   4 // Copyright (c) 2008 Jérémie "Garuma" Laval
   5 //
   6 // Permission is hereby granted, free of charge, to any person obtaining a copy
   7 // of this software and associated documentation files (the "Software"), to deal
   8 // in the Software without restriction, including without limitation the rights
   9 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 // copies of the Software, and to permit persons to whom the Software is
  11 // furnished to do so, subject to the following conditions:
  12 //
  13 // The above copyright notice and this permission notice shall be included in
  14 // all copies or substantial portions of the Software.
  15 //
  16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22 // THE SOFTWARE.
  23 //
  24 //
  25
  26 using System;
  27
  28 namespace System.Threading.Tasks
  29 {
  30
  31         public class Task<TResult>: Task
  32         {
  33                 TResult value;
  34                 static TaskFactory<TResult> factory = new TaskFactory<TResult> ();
  35
  36                 Func<object, TResult> function;
  37                 object state;
  38
  39                 public TResult Result {
  40                         get {
  41                                 if (function != null)
  42                                         Wait ();
  43                                 return value;
  44                         }
  45                         internal set {
  46                                 this.value = value;
  47                         }
  48                 }
  49
  50                 public static new TaskFactory<TResult> Factory {
  51                         get {
  52                                 return factory;
  53                         }
  54                 }
  55
  56                 public Task (Func<TResult> function) : this (function, TaskCreationOptions.None)
  57                 {
  58
  59                 }
  60
  61                 public Task (Func<TResult> function, CancellationToken token)
  62                         : this ((o) => function (), null, token, TaskCreationOptions.None)
  63                 {
  64
  65                 }
  66
  67                 public Task (Func<TResult> function, TaskCreationOptions options)
  68                         : this ((o) => function (), null, CancellationToken.None, options)
  69                 {
  70
  71                 }
  72
  73                 public Task (Func<TResult> function, CancellationToken token, TaskCreationOptions options)
  74                         : this ((o) => function (), null, token, options)
  75                 {
  76
  77                 }
  78
  79                 public Task (Func<object, TResult> function, object state) : this (function, state, TaskCreationOptions.None)
  80                 {
  81
  82                 }
  83
  84                 public Task (Func<object, TResult> function, object state, CancellationToken token)
  85                         : this (function, state, token, TaskCreationOptions.None)
  86                 {
  87
  88                 }
  89
  90                 public Task (Func<object, TResult> function, object state, TaskCreationOptions options)
  91                         : this (function, state, CancellationToken.None, options)
  92                 {
  93
  94                 }
  95
  96                 public Task (Func<object, TResult> function, object state, CancellationToken token, TaskCreationOptions options)
  97                         : base (null, state, token, options)
  98                 {
  99                         this.function = function;
 100                         this.state = state;
 101                 }
 102
 103                 internal override void InnerInvoke ()
 104                 {
 105                         if (function != null)
 106                                 value = function (state);
 107
 108                         function = null;
 109                         state = null;
 110                 }
 111
 112                 public Task ContinueWith (Action<Task<TResult>> a)
 113                 {
 114                         return ContinueWith (a, TaskContinuationOptions.None);
 115                 }
 116
 117                 public Task ContinueWith (Action<Task<TResult>> a, TaskContinuationOptions options)
 118                 {
 119                         return ContinueWith (a, CancellationToken.None, options, TaskScheduler.Current);
 120                 }
 121
 122                 public Task ContinueWith (Action<Task<TResult>> a, CancellationToken token)
 123                 {
 124                         return ContinueWith (a, token, TaskContinuationOptions.None, TaskScheduler.Current);
 125                 }
 126
 127                 public Task ContinueWith (Action<Task<TResult>> a, TaskScheduler scheduler)
 128                 {
 129                         return ContinueWith (a, CancellationToken.None, TaskContinuationOptions.None, scheduler);
 130                 }
 131
 132                 public Task ContinueWith (Action<Task<TResult>> a, CancellationToken token,
 133                                           TaskContinuationOptions options, TaskScheduler scheduler)
 134                 {
 135                         Task t = new Task ((o) => a ((Task<TResult>)o), this, token, GetCreationOptions (options));
 136                         ContinueWithCore (t, options, scheduler);
 137
 138                         return t;
 139                 }
 140
 141                 public Task<TNewResult> ContinueWith<TNewResult> (Func<Task<TResult>, TNewResult> a)
 142                 {
 143                         return ContinueWith<TNewResult> (a, TaskContinuationOptions.None);
 144                 }
 145
 146                 public Task<TNewResult> ContinueWith<TNewResult> (Func<Task<TResult>, TNewResult> a, CancellationToken token)
 147                 {
 148                         return ContinueWith<TNewResult> (a, token, TaskContinuationOptions.None, TaskScheduler.Current);
 149                 }
 150
 151                 public Task<TNewResult> ContinueWith<TNewResult> (Func<Task<TResult>, TNewResult> a, TaskContinuationOptions options)
 152                 {
 153                         return ContinueWith<TNewResult> (a, CancellationToken.None, options, TaskScheduler.Current);
 154                 }
 155
 156                 public Task<TNewResult> ContinueWith<TNewResult> (Func<Task<TResult>, TNewResult> a, TaskScheduler scheduler)
 157                 {
 158                         return ContinueWith<TNewResult> (a, CancellationToken.None, TaskContinuationOptions.None, scheduler);
 159                 }
 160
 161                 public Task<TNewResult> ContinueWith<TNewResult> (Func<Task<TResult>, TNewResult> a, CancellationToken token,
 162                                                                   TaskContinuationOptions options,
 163                                                                   TaskScheduler scheduler)
 164                 {
 165                         Task<TNewResult> t = new Task<TNewResult> ((o) => a ((Task<TResult>)o), this, token, GetCreationOptions (options));
 166                         ContinueWithCore (t, options, scheduler);
 167
 168                         return t;
 169                 }
 170         }
 171 }
 172 #endif