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

   1 //
   2 // Task_T.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 #if NET_4_0 || MOBILE
  27 using System;
  28
  29 namespace System.Threading.Tasks
  30 {
  31         [System.Diagnostics.DebuggerDisplay ("Id = {Id}, Status = {Status}, Method = {DebuggerDisplayMethodDescription}, Result = {DebuggerDisplayResultDescription}")]
  32         [System.Diagnostics.DebuggerTypeProxy ("System.Threading.Tasks.SystemThreadingTasks_FutureDebugView`1")]
  33         public class Task<TResult>: Task
  34         {
  35                 TResult value;
  36                 static TaskFactory<TResult> factory = new TaskFactory<TResult> ();
  37
  38                 Func<object, TResult> function;
  39                 object state;
  40
  41                 [System.Diagnostics.DebuggerBrowsable (System.Diagnostics.DebuggerBrowsableState.Never)]
  42                 public TResult Result {
  43                         get {
  44                                 if (function != null)
  45                                         Wait ();
  46                                 else if (Exception != null)
  47                                         throw Exception;
  48                                 return value;
  49                         }
  50                         internal set {
  51                                 this.value = value;
  52                         }
  53                 }
  54
  55                 public static new TaskFactory<TResult> Factory {
  56                         get {
  57                                 return factory;
  58                         }
  59                 }
  60
  61                 public Task (Func<TResult> function) : this (function, TaskCreationOptions.None)
  62                 {
  63
  64                 }
  65
  66                 public Task (Func<TResult> function, CancellationToken cancellationToken)
  67                         : this (function == null ? (Func<object, TResult>)null : (o) => function(), null, cancellationToken, TaskCreationOptions.None)
  68                 {
  69
  70                 }
  71
  72                 public Task (Func<TResult> function, TaskCreationOptions creationOptions)
  73                         : this (function == null ? (Func<object, TResult>)null : (o) => function(), null, CancellationToken.None, creationOptions)
  74                 {
  75
  76                 }
  77
  78                 public Task (Func<TResult> function, CancellationToken cancellationToken, TaskCreationOptions creationOptions)
  79                         : this (function == null ? (Func<object, TResult>)null : (o) => function(), null, cancellationToken, creationOptions)
  80                 {
  81
  82                 }
  83
  84                 public Task (Func<object, TResult> function, object state) : this (function, state, TaskCreationOptions.None)
  85                 {
  86
  87                 }
  88
  89                 public Task (Func<object, TResult> function, object state, CancellationToken cancellationToken)
  90                         : this (function, state, cancellationToken, TaskCreationOptions.None)
  91                 {
  92
  93                 }
  94
  95                 public Task (Func<object, TResult> function, object state, TaskCreationOptions creationOptions)
  96                         : this (function, state, CancellationToken.None, creationOptions)
  97                 {
  98
  99                 }
 100
 101                 public Task (Func<object, TResult> function, object state, CancellationToken cancellationToken, TaskCreationOptions creationOptions)
 102                         : base (null, state, cancellationToken, creationOptions)
 103                 {
 104                         this.function = function;
 105                         this.state = state;
 106                 }
 107
 108                 internal Task (Func<object, TResult> function,
 109                                object state,
 110                                CancellationToken cancellationToken,
 111                                TaskCreationOptions creationOptions,
 112                                Task parent)
 113                 : base (null, state, cancellationToken, creationOptions, parent)
 114                 {
 115                         this.function = function;
 116                         this.state = state;
 117                 }
 118
 119                 internal override void InnerInvoke ()
 120                 {
 121                         if (function != null)
 122                                 value = function (state);
 123
 124                         function = null;
 125                         state = null;
 126                 }
 127
 128                 public Task ContinueWith (Action<Task<TResult>> continuationAction)
 129                 {
 130                         return ContinueWith (continuationAction, TaskContinuationOptions.None);
 131                 }
 132
 133                 public Task ContinueWith (Action<Task<TResult>> continuationAction, TaskContinuationOptions continuationOptions)
 134                 {
 135                         return ContinueWith (continuationAction, CancellationToken.None, continuationOptions, TaskScheduler.Current);
 136                 }
 137
 138                 public Task ContinueWith (Action<Task<TResult>> continuationAction, CancellationToken cancellationToken)
 139                 {
 140                         return ContinueWith (continuationAction, cancellationToken, TaskContinuationOptions.None, TaskScheduler.Current);
 141                 }
 142
 143                 public Task ContinueWith (Action<Task<TResult>> continuationAction, TaskScheduler scheduler)
 144                 {
 145                         return ContinueWith (continuationAction, CancellationToken.None, TaskContinuationOptions.None, scheduler);
 146                 }
 147
 148                 public Task ContinueWith (Action<Task<TResult>> continuationAction, CancellationToken cancellationToken,
 149                                           TaskContinuationOptions continuationOptions, TaskScheduler scheduler)
 150                 {
 151                         if (continuationAction == null)
 152                                 throw new ArgumentNullException ("continuationFunction");
 153                         if (scheduler == null)
 154                                 throw new ArgumentNullException ("scheduler");
 155
 156                         Task t = new Task ((o) => continuationAction ((Task<TResult>)o),
 157                                            this,
 158                                            cancellationToken,
 159                                            GetCreationOptions (continuationOptions),
 160                                            this);
 161                         ContinueWithCore (t, continuationOptions, scheduler);
 162
 163                         return t;
 164                 }
 165
 166                 public Task<TNewResult> ContinueWith<TNewResult> (Func<Task<TResult>, TNewResult> continuationFunction)
 167                 {
 168                         return ContinueWith<TNewResult> (continuationFunction, TaskContinuationOptions.None);
 169                 }
 170
 171                 public Task<TNewResult> ContinueWith<TNewResult> (Func<Task<TResult>, TNewResult> continuationFunction, CancellationToken cancellationToken)
 172                 {
 173                         return ContinueWith<TNewResult> (continuationFunction, cancellationToken, TaskContinuationOptions.None, TaskScheduler.Current);
 174                 }
 175
 176                 public Task<TNewResult> ContinueWith<TNewResult> (Func<Task<TResult>, TNewResult> continuationFunction, TaskContinuationOptions continuationOptions)
 177                 {
 178                         return ContinueWith<TNewResult> (continuationFunction, CancellationToken.None, continuationOptions, TaskScheduler.Current);
 179                 }
 180
 181                 public Task<TNewResult> ContinueWith<TNewResult> (Func<Task<TResult>, TNewResult> continuationFunction, TaskScheduler scheduler)
 182                 {
 183                         return ContinueWith<TNewResult> (continuationFunction, CancellationToken.None, TaskContinuationOptions.None, scheduler);
 184                 }
 185
 186                 public Task<TNewResult> ContinueWith<TNewResult> (Func<Task<TResult>, TNewResult> continuationFunction,
 187                                                                   CancellationToken cancellationToken,
 188                                                                   TaskContinuationOptions continuationOptions,
 189                                                                   TaskScheduler scheduler)
 190                 {
 191                         Task<TNewResult> t = new Task<TNewResult> ((o) => continuationFunction ((Task<TResult>)o),
 192                                                                    this,
 193                                                                    cancellationToken,
 194                                                                    GetCreationOptions (continuationOptions),
 195                                                                    this);
 196                         ContinueWithCore (t, continuationOptions, scheduler);
 197
 198                         return t;
 199                 }
 200         }
 201 }
 202 #endif