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