137 lines
4.4 KiB
C#
137 lines
4.4 KiB
C#
//
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// Partitioner.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) 2009 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.Collections.Generic;
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namespace System.Collections.Concurrent
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{
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using Partitioners;
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public static class Partitioner
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{
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public static OrderablePartitioner<TSource> Create<TSource> (IEnumerable<TSource> source)
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{
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IList<TSource> tempIList = source as IList<TSource>;
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if (tempIList != null)
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return Create (tempIList, true);
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return new EnumerablePartitioner<TSource> (source);
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}
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public static OrderablePartitioner<TSource> Create<TSource> (TSource[] array, bool loadBalance)
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{
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return Create ((IList<TSource>)array, loadBalance);
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}
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public static OrderablePartitioner<TSource> Create<TSource> (IList<TSource> list, bool loadBalance)
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{
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return new ListPartitioner<TSource> (list);
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}
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public static OrderablePartitioner<Tuple<int, int>> Create (int fromInclusive,
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int toExclusive)
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{
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// This formula that is somewhat non-straighforward was guessed based on MS output
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int rangeSize = (toExclusive - fromInclusive) / (Environment.ProcessorCount * 3);
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if (rangeSize < 1)
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rangeSize = 1;
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return Create (fromInclusive, toExclusive, rangeSize);
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}
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public static OrderablePartitioner<Tuple<int, int>> Create (int fromInclusive,
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int toExclusive,
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int rangeSize)
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{
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if (fromInclusive >= toExclusive)
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throw new ArgumentOutOfRangeException ("toExclusive");
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if (rangeSize <= 0)
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throw new ArgumentOutOfRangeException ("rangeSize");
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return new UserRangePartitioner (fromInclusive, toExclusive, rangeSize);
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}
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public static OrderablePartitioner<Tuple<long, long>> Create (long fromInclusive,
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long toExclusive)
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{
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long rangeSize = (toExclusive - fromInclusive) / (Environment.ProcessorCount * 3);
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if (rangeSize < 1)
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rangeSize = 1;
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return Create (fromInclusive, toExclusive, rangeSize);
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}
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public static OrderablePartitioner<Tuple<long, long>> Create (long fromInclusive,
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long toExclusive,
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long rangeSize)
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{
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if (rangeSize <= 0)
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throw new ArgumentOutOfRangeException ("rangeSize");
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if (fromInclusive >= toExclusive)
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throw new ArgumentOutOfRangeException ("toExclusive");
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return new UserLongRangePartitioner (fromInclusive, toExclusive, rangeSize);
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}
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#if NET_4_5
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[MonoTODO]
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public static OrderablePartitioner<TSource> Create<TSource> (IEnumerable<TSource> source,
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EnumerablePartitionerOptions partitionerOptions)
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{
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throw new NotImplementedException ();
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}
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#endif
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}
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public abstract class Partitioner<TSource>
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{
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protected Partitioner ()
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{
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}
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public virtual IEnumerable<TSource> GetDynamicPartitions ()
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{
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if (!SupportsDynamicPartitions)
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throw new NotSupportedException ();
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return null;
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}
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public abstract IList<IEnumerator<TSource>> GetPartitions (int partitionCount);
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public virtual bool SupportsDynamicPartitions {
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get {
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return false;
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}
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}
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}
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}
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#endif
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