class/System.Core/System.Linq/ParallelQuery.cs

   1 //
   2 // ParallelQuery.cs
   3 //
   4 // Author:
   5 //       Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
   6 //
   7 // Copyright (c) 2010 Jérémie "Garuma" Laval
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining a copy
  10 // of this software and associated documentation files (the "Software"), to deal
  11 // in the Software without restriction, including without limitation the rights
  12 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13 // copies of the Software, and to permit persons to whom the Software is
  14 // furnished to do so, subject to the following conditions:
  15 //
  16 // The above copyright notice and this permission notice shall be included in
  17 // all copies or substantial portions of the Software.
  18 //
  19 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  22 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25 // THE SOFTWARE.
  26
  27 using System;
  28 using System.Threading;
  29 using System.Collections;
  30 using System.Collections.Generic;
  31 using System.Collections.Concurrent;
  32
  33 #if NET_4_0
  34
  35 namespace System.Linq
  36 {
  37         public class ParallelQuery : IEnumerable
  38         {
  39                 ParallelExecutionMode execMode = ParallelExecutionMode.Default;
  40                 ParallelMergeOptions mergeOptions = ParallelMergeOptions.Default;
  41
  42                 internal ParallelQuery ()
  43                 {
  44
  45                 }
  46
  47                 internal ParallelMergeOptions MergeOptions {
  48                         get {
  49                                 return mergeOptions;
  50                         }
  51                         set {
  52                                 mergeOptions = value;
  53                         }
  54                 }
  55
  56                 internal ParallelExecutionMode ExecMode {
  57                         get {
  58                                 return execMode;
  59                         }
  60                         set {
  61                                 execMode = value;
  62                         }
  63                 }
  64
  65                 IEnumerator IEnumerable.GetEnumerator ()
  66                 {
  67                         return GetEnumeratorTrick ();
  68                 }
  69
  70                 // Trick to get the correct IEnumerator from ParallelQuery<TSource>
  71                 internal virtual IEnumerator GetEnumeratorTrick ()
  72                 {
  73                         return null;
  74                 }
  75
  76                 internal virtual ParallelQuery<object> TypedQuery {
  77                         get {
  78                                 return null;
  79                         }
  80                 }
  81         }
  82
  83         public class ParallelQuery<TSource> : ParallelQuery, IEnumerable<TSource>, IEnumerable
  84         {
  85                 QueryBaseNode<TSource> node;
  86
  87                 internal ParallelQuery (QueryBaseNode<TSource> node)
  88                 {
  89                         this.node = node;
  90                 }
  91
  92                 internal QueryBaseNode<TSource> Node {
  93                         get {
  94                                 return node;
  95                         }
  96                 }
  97
  98                 public virtual IEnumerator<TSource> GetEnumerator ()
  99                 {
 100                         return GetEnumeratorInternal ();
 101                 }
 102
 103                 IEnumerator IEnumerable.GetEnumerator ()
 104                 {
 105                         return (IEnumerator)GetEnumeratorInternal ();
 106                 }
 107
 108                 IEnumerator<TSource> GetEnumeratorInternal ()
 109                 {
 110                         return new ParallelQueryEnumerator<TSource> (node);
 111                 }
 112
 113                 internal override IEnumerator GetEnumeratorTrick ()
 114                 {
 115                         return (IEnumerator)GetEnumeratorInternal ();
 116                 }
 117
 118                 internal override ParallelQuery<object> TypedQuery {
 119                         get {
 120                                 return new ParallelQuery<object> (new QueryCastNode<TSource> (node));
 121                         }
 122                 }
 123         }
 124 }
 125 #endif