122 lines
3.9 KiB
C#
122 lines
3.9 KiB
C#
//
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// UserRangePartitioner.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.Generic;
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namespace System.Collections.Concurrent.Partitioners
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{
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internal class UserRangePartitioner : OrderablePartitioner<Tuple<int, int>>
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{
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readonly int start;
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readonly int end;
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readonly int rangeSize;
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public UserRangePartitioner (int start, int end, int rangeSize) : base (true, true, true)
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{
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this.start = start;
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this.end = end;
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this.rangeSize = rangeSize;
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}
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public override IList<IEnumerator<KeyValuePair<long, Tuple<int, int>>>> GetOrderablePartitions (int partitionCount)
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{
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if (partitionCount <= 0)
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throw new ArgumentOutOfRangeException ("partitionCount");
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int currentIndex = 0;
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Func<int> getNextIndex = () => Interlocked.Increment (ref currentIndex) - 1;
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var enumerators = new IEnumerator<KeyValuePair<long, Tuple<int, int>>>[partitionCount];
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for (int i = 0; i < partitionCount; i++)
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enumerators[i] = GetEnumerator (getNextIndex);
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return enumerators;
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}
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IEnumerator<KeyValuePair<long, Tuple<int, int>>> GetEnumerator (Func<int> getNextIndex)
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{
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while (true) {
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int index = getNextIndex ();
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int sliceStart = index * rangeSize + start;
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if (sliceStart >= end)
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break;
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yield return new KeyValuePair<long, Tuple<int, int>> (index, Tuple.Create (sliceStart, Math.Min (end, sliceStart + rangeSize)));
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sliceStart += rangeSize;
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}
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}
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}
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internal class UserLongRangePartitioner : OrderablePartitioner<Tuple<long, long>>
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{
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readonly long start;
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readonly long end;
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readonly long rangeSize;
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public UserLongRangePartitioner (long start, long end, long rangeSize) : base (true, true, true)
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{
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this.start = start;
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this.end = end;
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this.rangeSize = rangeSize;
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}
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public override IList<IEnumerator<KeyValuePair<long, Tuple<long, long>>>> GetOrderablePartitions (int partitionCount)
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{
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if (partitionCount <= 0)
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throw new ArgumentOutOfRangeException ("partitionCount");
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long currentIndex = 0;
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Func<long> getNextIndex = () => Interlocked.Increment (ref currentIndex) - 1;
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var enumerators = new IEnumerator<KeyValuePair<long, Tuple<long, long>>>[partitionCount];
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for (int i = 0; i < partitionCount; i++)
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enumerators[i] = GetEnumerator (getNextIndex);
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return enumerators;
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}
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IEnumerator<KeyValuePair<long, Tuple<long, long>>> GetEnumerator (Func<long> getNextIndex)
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{
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while (true) {
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long index = getNextIndex ();
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long sliceStart = index * rangeSize + start;
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if (sliceStart >= end)
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break;
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yield return new KeyValuePair<long, Tuple<long, long>> (index, Tuple.Create (sliceStart, Math.Min (end, sliceStart + rangeSize)));
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sliceStart += rangeSize;
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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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