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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / System / Linq / Parallel / QueryOperators / UnaryQueryOperator.cs / 1305376 / UnaryQueryOperator.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ // // UnaryQueryOperator.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 UnaryQueryOperator : QueryOperator { // The single child operator for the current node. private readonly QueryOperator m_child; // The state of the order index of the output of this operator. private OrdinalIndexState m_indexState = OrdinalIndexState.Shuffled; //---------------------------------------------------------------------------------------- // Constructors // internal UnaryQueryOperator(IEnumerable child) : this(QueryOperator .AsQueryOperator(child)) { } internal UnaryQueryOperator(IEnumerable child, bool outputOrdered) : this(QueryOperator .AsQueryOperator(child), outputOrdered) { } private UnaryQueryOperator(QueryOperator child) : this(child, child.OutputOrdered, child.SpecifiedQuerySettings) { } internal UnaryQueryOperator(QueryOperator child, bool outputOrdered) : this(child, outputOrdered, child.SpecifiedQuerySettings) { } private UnaryQueryOperator(QueryOperator child, bool outputOrdered, QuerySettings settings) : base(outputOrdered, settings) { m_child = child; } internal QueryOperator Child { get { return m_child; } } internal override sealed OrdinalIndexState OrdinalIndexState { get { return m_indexState; } } protected void SetOrdinalIndexState(OrdinalIndexState indexState) { m_indexState = indexState; } //--------------------------------------------------------------------------------------- // This method wraps each enumerator in inputStream with an enumerator performing this // operator's transformation. 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 potentially uses a different order key // from the order key of the input stream. // internal abstract void WrapPartitionedStream ( PartitionedStream inputStream, IPartitionedStreamRecipient recipient, bool preferStriping, QuerySettings settings); //--------------------------------------------------------------------------------------- // Implementation of QueryResults for an unary operator. The results will not be indexible // unless a derived class provides that functionality. // internal class UnaryQueryOperatorResults : QueryResults { protected QueryResults m_childQueryResults; // Results of the child query private UnaryQueryOperator 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 UnaryQueryOperatorResults(QueryResults childQueryResults, UnaryQueryOperator op, QuerySettings settings, bool preferStriping) { m_childQueryResults = childQueryResults; 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_childQueryResults.GivePartitionedStream(new ChildResultsRecipient(recipient, m_op, m_preferStriping, m_settings)); } } //--------------------------------------------------------------------------------------- // ChildResultsRecipient is a recipient of a partitioned stream. It receives a partitioned // stream from the child operator, wraps the enumerators with the transformation for this // operator, and passes the partitioned stream along to the next recipient (the parent // operator). // private class ChildResultsRecipient : IPartitionedStreamRecipient { IPartitionedStreamRecipient m_outputRecipient; UnaryQueryOperator m_op; bool m_preferStriping; QuerySettings m_settings; internal ChildResultsRecipient( IPartitionedStreamRecipient outputRecipient, UnaryQueryOperator op, bool preferStriping, QuerySettings settings) { m_outputRecipient = outputRecipient; m_op = op; m_preferStriping = preferStriping; m_settings = settings; } public void Receive (PartitionedStream inputStream) { // Call WrapPartitionedStream on our operator, which will wrap the input // partitioned stream, and pass the result along to m_outputRecipient. m_op.WrapPartitionedStream(inputStream, m_outputRecipient, m_preferStriping, m_settings); } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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