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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / System / Linq / Parallel / QueryOperators / Inlined / InlinedAggregationOperator.cs / 1305376 / InlinedAggregationOperator.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ // // InlinedAggregationOperator.cs // //[....] // // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- using System.Collections.Generic; using System.Diagnostics.Contracts; using System.Threading; namespace System.Linq.Parallel { ////// This class is common to all of the "inlined" versions of various aggregations. The /// inlined operators ensure that real MSIL instructions are used to perform elementary /// operations versus general purpose delegate-based binary operators. For obvious reasons /// this is a quite bit more efficient, although it does lead to a fair bit of unfortunate /// code duplication. /// ////// /// internal abstract class InlinedAggregationOperator : UnaryQueryOperator { //---------------------------------------------------------------------------------------- // Constructs a new instance of an inlined sum associative operator. // internal InlinedAggregationOperator(IEnumerable child) :base(child) { Contract.Assert(child != null, "child data source cannot be null"); } //--------------------------------------------------------------------------------------- // Executes the entire query tree, and aggregates the intermediate results into the // final result based on the binary operators and final reduction. // // Return Value: // The single result of aggregation. // internal TResult Aggregate() { TResult tr; Exception toThrow = null; try { tr = InternalAggregate(ref toThrow); } catch (ThreadAbortException) { // Do not wrap ThreadAbortExceptions throw; } catch (Exception ex) { // If the exception is not an aggregate, we must wrap it up and throw that instead. if (!(ex is AggregateException)) { // // Special case: if the query has been canceled, we do not want to wrap the // OperationCanceledException with an AggregateException. // // The query has been canceled iff these conditions hold: // - The exception thrown is OperationCanceledException // - We find the external CancellationToken for this query in the OperationCanceledException // - The externalToken is actually in the canceled state. OperationCanceledException cancelEx = ex as OperationCanceledException; if (cancelEx != null && cancelEx.CancellationToken == SpecifiedQuerySettings.CancellationState.ExternalCancellationToken && SpecifiedQuerySettings.CancellationState.ExternalCancellationToken.IsCancellationRequested) { throw; } throw new AggregateException(ex); } // Else, just rethrow the current active exception. throw; } // If the aggregation requested that we throw a singular exception, throw it. if (toThrow != null) { throw toThrow; } return tr; } //--------------------------------------------------------------------------------------- // Performs the operator-specific aggregation. // // Arguments: // singularExceptionToThrow - if the aggregate exception should throw an exception // without aggregating, this ref-param should be set // // Return Value: // The single result of aggregation. // protected abstract TResult InternalAggregate(ref Exception singularExceptionToThrow); //--------------------------------------------------------------------------------------- // Just opens the current operator, including opening the child and wrapping it with // partitions as needed. // internal override QueryResults Open( QuerySettings settings, bool preferStriping) { QueryResults childQueryResults = Child.Open(settings, preferStriping); return new UnaryQueryOperatorResults(childQueryResults, this, settings, preferStriping); } internal override void WrapPartitionedStream ( PartitionedStream inputStream, IPartitionedStreamRecipient recipient, bool preferStriping, QuerySettings settings) { int partitionCount = inputStream.PartitionCount; PartitionedStream outputStream = new PartitionedStream ( partitionCount, Util.GetDefaultComparer (), OrdinalIndexState.Correct); for (int i = 0; i < partitionCount; i++) { outputStream[i] = CreateEnumerator (i, partitionCount, inputStream[i], null, settings.CancellationState.MergedCancellationToken); } recipient.Receive(outputStream); } protected abstract QueryOperatorEnumerator CreateEnumerator ( int index, int count, QueryOperatorEnumerator source, object sharedData, CancellationToken cancellationToken); internal override IEnumerable AsSequentialQuery(CancellationToken token) { Contract.Assert(false, "This method should never be called. Associative aggregation can always be parallelized."); throw new NotSupportedException(); } //---------------------------------------------------------------------------------------- // Whether this operator performs a premature merge. // internal override bool LimitsParallelism { get { return false; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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