91 lines
3.4 KiB
C#
91 lines
3.4 KiB
C#
//
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// QueryOrderByNode.cs
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//
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// Author:
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// Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
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//
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// Copyright (c) 2010 Jérémie "Garuma" Laval
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#if NET_4_0
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using System;
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using System.Threading;
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using System.Collections;
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using System.Collections.Generic;
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using System.Collections.Concurrent;
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namespace System.Linq.Parallel.QueryNodes
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{
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internal class QueryGroupByNode<TSource, TKey, TElement> : QueryStreamNode<IGrouping<TKey, TElement>, TSource>
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{
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Func<TSource, TKey> keySelector;
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Func<TSource, TElement> elementSelector;
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IEqualityComparer<TKey> comparer;
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public QueryGroupByNode (QueryBaseNode<TSource> parent,
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Func<TSource, TKey> keySelector,
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Func<TSource, TElement> elementSelector,
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IEqualityComparer<TKey> comparer)
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: base (parent, false)
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{
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this.keySelector = keySelector;
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this.elementSelector = elementSelector;
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this.comparer = comparer;
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}
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internal override IEnumerable<IGrouping<TKey, TElement>> GetSequential ()
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{
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IEnumerable<TSource> src = Parent.GetSequential ();
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return src.GroupBy (keySelector, elementSelector, comparer);
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}
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internal override IList<IEnumerable<IGrouping<TKey, TElement>>> GetEnumerables (QueryOptions options)
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{
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return ParallelPartitioner.CreateForChunks (GetGroupedElements ()).GetPartitions (options.PartitionCount).Wrap ();
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}
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internal override IList<IEnumerable<KeyValuePair<long, IGrouping<TKey, TElement>>>> GetOrderedEnumerables (QueryOptions options)
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{
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return ParallelPartitioner.CreateForChunks (GetGroupedElements ()).GetOrderablePartitions (options.PartitionCount).Wrap ();
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}
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internal IEnumerable<IGrouping<TKey, TElement>> GetGroupedElements ()
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{
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return (IEnumerable<System.Linq.IGrouping<TKey,TElement>>)GetStore ().Select (e => (IGrouping<TKey,TElement>)new ConcurrentGrouping<TKey, TElement> (e.Key, e.Value));
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}
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internal ConcurrentDictionary<TKey, ConcurrentQueue<TElement>> GetStore ()
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{
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var store = new ConcurrentDictionary<TKey, ConcurrentQueue<TElement>> ();
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Func<TKey, ConcurrentQueue<TElement>> queueFactory = (_) => new ConcurrentQueue<TElement> ();
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ParallelExecuter.ProcessAndBlock (Parent, (e, c) => {
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ConcurrentQueue<TElement> queue = store.GetOrAdd (keySelector (e), queueFactory);
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queue.Enqueue (elementSelector (e));
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});
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return store;
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}
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}
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}
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#endif
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