Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / System / Linq / Parallel / QueryOperators / BinaryQueryOperator.cs / 1305376 / BinaryQueryOperator.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ // // BinaryQueryOperator.cs // //[....] // // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- using System.Collections.Generic; using System.Diagnostics.Contracts; namespace System.Linq.Parallel { ////// The base class from which all binary query operators derive, that is, those that /// have two child operators. This introduces some convenience methods for those /// classes, as well as any state common to all subclasses. /// ////// /// internal abstract class BinaryQueryOperator : QueryOperator { // A set of child operators for the current node. private readonly QueryOperator m_leftChild; private readonly QueryOperator m_rightChild; private OrdinalIndexState m_indexState = OrdinalIndexState.Shuffled; //---------------------------------------------------------------------------------------- // Stores a set of child operators on this query node. // internal BinaryQueryOperator(ParallelQuery leftChild, ParallelQuery rightChild) :this(QueryOperator .AsQueryOperator(leftChild), QueryOperator .AsQueryOperator(rightChild)) { } internal BinaryQueryOperator(QueryOperator leftChild, QueryOperator rightChild) : base(false, leftChild.SpecifiedQuerySettings.Merge(rightChild.SpecifiedQuerySettings)) { Contract.Assert(leftChild != null && rightChild != null); m_leftChild = leftChild; m_rightChild = rightChild; } internal QueryOperator LeftChild { get { return m_leftChild; } } internal QueryOperator RightChild { get { return m_rightChild; } } internal override sealed OrdinalIndexState OrdinalIndexState { get { return m_indexState; } } protected void SetOrdinalIndex(OrdinalIndexState indexState) { m_indexState = indexState; } //--------------------------------------------------------------------------------------- // This method wraps accepts two child partitioned streams, and constructs an output // partitioned stream. However, instead of returning the transformed partitioned // stream, we pass it to a recipient object by calling recipient.Give (..). That // way, we can "return" a partitioned stream that uses an order key selected by the operator. // public abstract void WrapPartitionedStream ( PartitionedStream leftPartitionedStream, PartitionedStream rightPartitionedStream, IPartitionedStreamRecipient outputRecipient, bool preferStriping, QuerySettings settings); //--------------------------------------------------------------------------------------- // Implementation of QueryResults for a binary operator. The results will not be indexible // unless a derived class provides that functionality. // internal class BinaryQueryOperatorResults : QueryResults { protected QueryResults m_leftChildQueryResults; // Results of the left child query protected QueryResults m_rightChildQueryResults; // Results of the right child query private BinaryQueryOperator m_op; // Operator that generated these results private QuerySettings m_settings; // Settings collected from the query private bool m_preferStriping; // If the results are indexible, should we use striping when partitioning them internal BinaryQueryOperatorResults( QueryResults leftChildQueryResults, QueryResults rightChildQueryResults, BinaryQueryOperator op, QuerySettings settings, bool preferStriping) { m_leftChildQueryResults = leftChildQueryResults; m_rightChildQueryResults = rightChildQueryResults; m_op = op; m_settings = settings; m_preferStriping = preferStriping; } internal override void GivePartitionedStream(IPartitionedStreamRecipient recipient) { Contract.Assert(IsIndexible == (m_op.OrdinalIndexState == OrdinalIndexState.Indexible)); if (m_settings.ExecutionMode.Value == ParallelExecutionMode.Default && m_op.LimitsParallelism) { // We need to run the query sequentially up to and including this operator IEnumerable opSequential = m_op.AsSequentialQuery(m_settings.CancellationState.ExternalCancellationToken); PartitionedStream result = ExchangeUtilities.PartitionDataSource( opSequential, m_settings.DegreeOfParallelism.Value, m_preferStriping); recipient.Receive (result); } else if (IsIndexible) { // The output of this operator is indexible. Pass the partitioned output into the IPartitionedStreamRecipient. PartitionedStream result = ExchangeUtilities.PartitionDataSource(this, m_settings.DegreeOfParallelism.Value, m_preferStriping); recipient.Receive (result); } else { // The common case: get partitions from the child and wrap each partition. m_leftChildQueryResults.GivePartitionedStream(new LeftChildResultsRecipient(recipient, this, m_preferStriping, m_settings)); } } //--------------------------------------------------------------------------------------- // LeftChildResultsRecipient is a recipient of a partitioned stream. It receives a partitioned // stream from the left child operator, and passes the results along to a // RightChildResultsRecipient. // private class LeftChildResultsRecipient : IPartitionedStreamRecipient { IPartitionedStreamRecipient m_outputRecipient; BinaryQueryOperatorResults m_results; bool m_preferStriping; QuerySettings m_settings; internal LeftChildResultsRecipient(IPartitionedStreamRecipient outputRecipient, BinaryQueryOperatorResults results, bool preferStriping, QuerySettings settings) { m_outputRecipient = outputRecipient; m_results = results; m_preferStriping = preferStriping; m_settings = settings; } public void Receive (PartitionedStream source) { RightChildResultsRecipient rightChildRecipient = new RightChildResultsRecipient (m_outputRecipient, m_results.m_op, source, m_preferStriping, m_settings); m_results.m_rightChildQueryResults.GivePartitionedStream(rightChildRecipient); } } //---------------------------------------------------------------------------------------- // RightChildResultsRecipient receives a partitioned from the right child operator. Also, // the partitioned stream from the left child operator is passed into the constructor. // So, Receive has partitioned streams for both child operators, and also is called in // a context where it has access to both TLeftKey and TRightKey. Then, it passes both // streams (as arguments) and key types (as type arguments) to the operator's // WrapPartitionedStream method. // private class RightChildResultsRecipient : IPartitionedStreamRecipient { IPartitionedStreamRecipient m_outputRecipient; PartitionedStream m_leftPartitionedStream; BinaryQueryOperator m_op; bool m_preferStriping; QuerySettings m_settings; internal RightChildResultsRecipient( IPartitionedStreamRecipient outputRecipient, BinaryQueryOperator op, PartitionedStream leftPartitionedStream, bool preferStriping, QuerySettings settings) { m_outputRecipient = outputRecipient; m_op = op; m_preferStriping = preferStriping; m_leftPartitionedStream = leftPartitionedStream; m_settings = settings; } public void Receive (PartitionedStream rightPartitionedStream) { m_op.WrapPartitionedStream(m_leftPartitionedStream, rightPartitionedStream, m_outputRecipient, m_preferStriping, m_settings); } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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