127 lines
4.3 KiB
C#
127 lines
4.3 KiB
C#
//
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// QueryStartNode.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.Collections;
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using System.Collections.Generic;
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using System.Collections.Concurrent;
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using System.Threading;
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using System.Threading.Tasks;
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namespace System.Linq.Parallel.QueryNodes
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{
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internal interface QueryStartNode : IVisitableNode {
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int Count { get; }
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}
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internal class QueryStartNode<T> : QueryBaseNode<T>, QueryStartNode
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{
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readonly IEnumerable<T> source;
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readonly Partitioner<T> customPartitioner;
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internal QueryStartNode (IEnumerable<T> source)
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{
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if (source == null)
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throw new ArgumentNullException ("source");
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this.source = source;
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}
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internal QueryStartNode (Partitioner<T> custom)
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{
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if (custom == null)
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throw new ArgumentNullException ("custom");
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this.customPartitioner = custom;
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}
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// If possible, this property will return the number of element the query
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// is going to process. If that number if pretty low, executing the query
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// sequentially is better
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public int Count {
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get {
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if (source == null)
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return -1;
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ICollection coll = source as ICollection;
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return coll == null ? -1 : coll.Count;
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}
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}
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public override void Visit (INodeVisitor visitor)
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{
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visitor.Visit ((QueryStartNode)this);
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}
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internal override IEnumerable<T> GetSequential ()
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{
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if (source != null)
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return source;
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return WrapHelper.Wrap (customPartitioner.GetPartitions (1))[0];
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}
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internal override IList<IEnumerable<T>> GetEnumerables (QueryOptions options)
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{
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if (customPartitioner != null) {
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return WrapHelper.Wrap (customPartitioner.GetPartitions (options.PartitionCount));
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}
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Partitioner<T> partitioner
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= (options.UseStrip) ? ParallelPartitioner.CreateForStrips (source, 1) : ParallelPartitioner.CreateBest (source);
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return WrapHelper.Wrap (partitioner.GetPartitions (options.PartitionCount));
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}
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internal override IList<IEnumerable<KeyValuePair<long, T>>> GetOrderedEnumerables (QueryOptions options)
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{
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OrderablePartitioner<T> partitioner = null;
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if (customPartitioner != null) {
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partitioner = customPartitioner as OrderablePartitioner<T>;
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if (partitioner == null)
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throw new InvalidOperationException ("The partitionner you are using doesn't support ordered partitionning");
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} else {
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partitioner =
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(options.UseStrip) ? ParallelPartitioner.CreateForStrips (source, 1) : ParallelPartitioner.CreateBest (source);
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}
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options.PartitionerSettings = Tuple.Create (partitioner.KeysOrderedAcrossPartitions,
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partitioner.KeysOrderedInEachPartition,
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partitioner.KeysNormalized);
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// We only support one style of partitioning at the moment.
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// Standard partitioners follow this style.
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if (options.UseStrip && (!partitioner.KeysOrderedInEachPartition || partitioner.KeysOrderedAcrossPartitions))
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throw new NotImplementedException ("Partitioner must have KeysOrderedInEachPartition "
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+ "and !KeysOrderedAcrossPartitions"
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+ "to be used with indexed operators");
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return WrapHelper.Wrap (partitioner.GetOrderablePartitions (options.PartitionCount));
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}
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}
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}
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#endif |