code.grnet.gr Git - pithos-ms-client/blob - trunk/Libraries/ParallelExtensionsExtras/Extensions/TaskFactoryExtensions/TaskFactoryExtensions_Common.cs

   1 //--------------------------------------------------------------------------
   2 //
   3 //  Copyright (c) Microsoft Corporation.  All rights reserved.
   4 //
   5 //  File: TaskFactoryExtensions_Common.cs
   6 //
   7 //--------------------------------------------------------------------------
   8
   9 namespace System.Threading.Tasks
  10 {
  11     /// <summary>Extensions for TaskFactory.</summary>
  12     public static partial class TaskFactoryExtensions
  13     {
  14         /// <summary>Creates a generic TaskFactory from a non-generic one.</summary>
  15         /// <typeparam name="TResult">Specifies the type of Task results for the Tasks created by the new TaskFactory.</typeparam>
  16         /// <param name="factory">The TaskFactory to serve as a template.</param>
  17         /// <returns>The created TaskFactory.</returns>
  18         public static TaskFactory<TResult> ToGeneric<TResult>(this TaskFactory factory)
  19         {
  20             return new TaskFactory<TResult>(
  21                 factory.CancellationToken, factory.CreationOptions, factory.ContinuationOptions, factory.Scheduler);
  22         }
  23
  24         /// <summary>Creates a generic TaskFactory from a non-generic one.</summary>
  25         /// <typeparam name="TResult">Specifies the type of Task results for the Tasks created by the new TaskFactory.</typeparam>
  26         /// <param name="factory">The TaskFactory to serve as a template.</param>
  27         /// <returns>The created TaskFactory.</returns>
  28         public static TaskFactory ToNonGeneric<TResult>(this TaskFactory<TResult> factory)
  29         {
  30             return new TaskFactory(
  31                 factory.CancellationToken, factory.CreationOptions, factory.ContinuationOptions, factory.Scheduler);
  32         }
  33
  34         /// <summary>Gets the TaskScheduler instance that should be used to schedule tasks.</summary>
  35         public static TaskScheduler GetTargetScheduler(this TaskFactory factory)
  36         {
  37             if (factory == null) throw new ArgumentNullException("factory");
  38             return factory.Scheduler ?? TaskScheduler.Current;
  39         }
  40
  41         /// <summary>Gets the TaskScheduler instance that should be used to schedule tasks.</summary>
  42         public static TaskScheduler GetTargetScheduler<TResult>(this TaskFactory<TResult> factory)
  43         {
  44             if (factory == null) throw new ArgumentNullException("factory");
  45             return factory.Scheduler != null ? factory.Scheduler : TaskScheduler.Current;
  46         }
  47
  48         /// <summary>Converts TaskCreationOptions into TaskContinuationOptions.</summary>
  49         /// <param name="creationOptions"></param>
  50         /// <returns></returns>
  51         private static TaskContinuationOptions ContinuationOptionsFromCreationOptions(TaskCreationOptions creationOptions)
  52         {
  53             return (TaskContinuationOptions)
  54                 ((creationOptions & TaskCreationOptions.AttachedToParent) |
  55                  (creationOptions & TaskCreationOptions.PreferFairness) |
  56                  (creationOptions & TaskCreationOptions.LongRunning));
  57         }
  58     }
  59 }