Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / System / Linq / Parallel / QueryOperators / PartitionerQueryOperator.cs / 1305376 / PartitionerQueryOperator.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ // // PartitionerQueryOperator.cs // //[....] // // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Collections.Concurrent; using System.Linq.Parallel; using System.Diagnostics.Contracts; using System.Threading; namespace System.Linq.Parallel { ////// A QueryOperator that represents the output of the query partitioner.AsParallel(). /// internal class PartitionerQueryOperator: QueryOperator { private Partitioner m_partitioner; // The partitioner to use as data source. internal PartitionerQueryOperator(Partitioner partitioner) : base(false, QuerySettings.Empty) { m_partitioner = partitioner; } internal bool Orderable { get { return m_partitioner is OrderablePartitioner ; } } internal override QueryResults Open(QuerySettings settings, bool preferStriping) { // Notice that the preferStriping argument is not used. Partitioner does not support // striped partitioning. return new PartitionerQueryOperatorResults(m_partitioner, settings); } //---------------------------------------------------------------------------------------- // Returns an enumerable that represents the query executing sequentially. // internal override IEnumerable AsSequentialQuery(CancellationToken token) { using (IEnumerator enumerator = m_partitioner.GetPartitions(1)[0]) { while (enumerator.MoveNext()) { yield return enumerator.Current; } } } //--------------------------------------------------------------------------------------- // The state of the order index of the results returned by this operator. // internal override OrdinalIndexState OrdinalIndexState { get { return GetOrdinalIndexState(m_partitioner); } } /// /// Determines the OrdinalIndexState for a partitioner /// internal static OrdinalIndexState GetOrdinalIndexState(Partitionerpartitioner) { OrderablePartitioner orderablePartitioner = partitioner as OrderablePartitioner ; if (orderablePartitioner == null) { return OrdinalIndexState.Shuffled; } if (orderablePartitioner.KeysOrderedInEachPartition) { if (orderablePartitioner.KeysNormalized) { return OrdinalIndexState.Correct; } else { return OrdinalIndexState.Increasing; } } else { return OrdinalIndexState.Shuffled; } } //--------------------------------------------------------------------------------------- // Whether this operator performs a premature merge. // internal override bool LimitsParallelism { get { return false; } } /// /// QueryResults for a PartitionerQueryOperator /// private class PartitionerQueryOperatorResults : QueryResults{ private Partitioner m_partitioner; // The data source for the query private QuerySettings m_settings; // Settings collected from the query internal PartitionerQueryOperatorResults(Partitioner partitioner, QuerySettings settings) { m_partitioner = partitioner; m_settings = settings; } internal override void GivePartitionedStream(IPartitionedStreamRecipient recipient) { Contract.Assert(m_settings.DegreeOfParallelism.HasValue); int partitionCount = m_settings.DegreeOfParallelism.Value; OrderablePartitioner orderablePartitioner = m_partitioner as OrderablePartitioner ; // If the partitioner is not orderable, it will yield zeros as order keys. The order index state // is irrelevant. OrdinalIndexState indexState = (orderablePartitioner != null) ? GetOrdinalIndexState(orderablePartitioner) : OrdinalIndexState.Shuffled; PartitionedStream partitions = new PartitionedStream ( partitionCount, Util.GetDefaultComparer (), indexState); if (orderablePartitioner != null) { IList >> partitionerPartitions = orderablePartitioner.GetOrderablePartitions(partitionCount); if (partitionerPartitions == null) { throw new InvalidOperationException(SR.GetString(SR.PartitionerQueryOperator_NullPartitionList)); } if (partitionerPartitions.Count != partitionCount) { throw new InvalidOperationException(SR.GetString(SR.PartitionerQueryOperator_WrongNumberOfPartitions)); } for (int i = 0; i < partitionCount; i++) { IEnumerator > partition = partitionerPartitions[i]; if (partition == null) { throw new InvalidOperationException(SR.GetString(SR.PartitionerQueryOperator_NullPartition)); } partitions[i] = new OrderablePartitionerEnumerator(partition); } } else { IList > partitionerPartitions = m_partitioner.GetPartitions(partitionCount); if (partitionerPartitions == null) { throw new InvalidOperationException(SR.GetString(SR.PartitionerQueryOperator_NullPartitionList)); } if (partitionerPartitions.Count != partitionCount) { throw new InvalidOperationException(SR.GetString(SR.PartitionerQueryOperator_WrongNumberOfPartitions)); } for (int i = 0; i < partitionCount; i++) { IEnumerator partition = partitionerPartitions[i]; if (partition == null) { throw new InvalidOperationException(SR.GetString(SR.PartitionerQueryOperator_NullPartition)); } partitions[i] = new PartitionerEnumerator(partition); } } recipient.Receive (partitions); } } /// /// Enumerator that converts an enumerator over key-value pairs exposed by a partitioner /// to a QueryOperatorEnumerator used by PLINQ internally. /// private class OrderablePartitionerEnumerator : QueryOperatorEnumerator{ private IEnumerator > m_sourceEnumerator; internal OrderablePartitionerEnumerator(IEnumerator > sourceEnumerator) { m_sourceEnumerator = sourceEnumerator; } internal override bool MoveNext(ref TElement currentElement, ref int currentKey) { if (!m_sourceEnumerator.MoveNext()) return false; KeyValuePair current = m_sourceEnumerator.Current; currentElement = current.Value; checked { currentKey = (int)current.Key; } return true; } protected override void Dispose(bool disposing) { Contract.Assert(m_sourceEnumerator != null); m_sourceEnumerator.Dispose(); } } /// /// Enumerator that converts an enumerator over key-value pairs exposed by a partitioner /// to a QueryOperatorEnumerator used by PLINQ internally. /// private class PartitionerEnumerator : QueryOperatorEnumerator{ private IEnumerator m_sourceEnumerator; internal PartitionerEnumerator(IEnumerator sourceEnumerator) { m_sourceEnumerator = sourceEnumerator; } internal override bool MoveNext(ref TElement currentElement, ref int currentKey) { if (!m_sourceEnumerator.MoveNext()) return false; currentElement = m_sourceEnumerator.Current; currentKey = 0; return true; } protected override void Dispose(bool disposing) { Contract.Assert(m_sourceEnumerator != null); m_sourceEnumerator.Dispose(); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ // // PartitionerQueryOperator.cs // // [....] // // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Collections.Concurrent; using System.Linq.Parallel; using System.Diagnostics.Contracts; using System.Threading; namespace System.Linq.Parallel { ////// A QueryOperator that represents the output of the query partitioner.AsParallel(). /// internal class PartitionerQueryOperator: QueryOperator { private Partitioner m_partitioner; // The partitioner to use as data source. internal PartitionerQueryOperator(Partitioner partitioner) : base(false, QuerySettings.Empty) { m_partitioner = partitioner; } internal bool Orderable { get { return m_partitioner is OrderablePartitioner ; } } internal override QueryResults Open(QuerySettings settings, bool preferStriping) { // Notice that the preferStriping argument is not used. Partitioner does not support // striped partitioning. return new PartitionerQueryOperatorResults(m_partitioner, settings); } //---------------------------------------------------------------------------------------- // Returns an enumerable that represents the query executing sequentially. // internal override IEnumerable AsSequentialQuery(CancellationToken token) { using (IEnumerator enumerator = m_partitioner.GetPartitions(1)[0]) { while (enumerator.MoveNext()) { yield return enumerator.Current; } } } //--------------------------------------------------------------------------------------- // The state of the order index of the results returned by this operator. // internal override OrdinalIndexState OrdinalIndexState { get { return GetOrdinalIndexState(m_partitioner); } } /// /// Determines the OrdinalIndexState for a partitioner /// internal static OrdinalIndexState GetOrdinalIndexState(Partitionerpartitioner) { OrderablePartitioner orderablePartitioner = partitioner as OrderablePartitioner ; if (orderablePartitioner == null) { return OrdinalIndexState.Shuffled; } if (orderablePartitioner.KeysOrderedInEachPartition) { if (orderablePartitioner.KeysNormalized) { return OrdinalIndexState.Correct; } else { return OrdinalIndexState.Increasing; } } else { return OrdinalIndexState.Shuffled; } } //--------------------------------------------------------------------------------------- // Whether this operator performs a premature merge. // internal override bool LimitsParallelism { get { return false; } } /// /// QueryResults for a PartitionerQueryOperator /// private class PartitionerQueryOperatorResults : QueryResults{ private Partitioner m_partitioner; // The data source for the query private QuerySettings m_settings; // Settings collected from the query internal PartitionerQueryOperatorResults(Partitioner partitioner, QuerySettings settings) { m_partitioner = partitioner; m_settings = settings; } internal override void GivePartitionedStream(IPartitionedStreamRecipient recipient) { Contract.Assert(m_settings.DegreeOfParallelism.HasValue); int partitionCount = m_settings.DegreeOfParallelism.Value; OrderablePartitioner orderablePartitioner = m_partitioner as OrderablePartitioner ; // If the partitioner is not orderable, it will yield zeros as order keys. The order index state // is irrelevant. OrdinalIndexState indexState = (orderablePartitioner != null) ? GetOrdinalIndexState(orderablePartitioner) : OrdinalIndexState.Shuffled; PartitionedStream partitions = new PartitionedStream ( partitionCount, Util.GetDefaultComparer (), indexState); if (orderablePartitioner != null) { IList >> partitionerPartitions = orderablePartitioner.GetOrderablePartitions(partitionCount); if (partitionerPartitions == null) { throw new InvalidOperationException(SR.GetString(SR.PartitionerQueryOperator_NullPartitionList)); } if (partitionerPartitions.Count != partitionCount) { throw new InvalidOperationException(SR.GetString(SR.PartitionerQueryOperator_WrongNumberOfPartitions)); } for (int i = 0; i < partitionCount; i++) { IEnumerator > partition = partitionerPartitions[i]; if (partition == null) { throw new InvalidOperationException(SR.GetString(SR.PartitionerQueryOperator_NullPartition)); } partitions[i] = new OrderablePartitionerEnumerator(partition); } } else { IList > partitionerPartitions = m_partitioner.GetPartitions(partitionCount); if (partitionerPartitions == null) { throw new InvalidOperationException(SR.GetString(SR.PartitionerQueryOperator_NullPartitionList)); } if (partitionerPartitions.Count != partitionCount) { throw new InvalidOperationException(SR.GetString(SR.PartitionerQueryOperator_WrongNumberOfPartitions)); } for (int i = 0; i < partitionCount; i++) { IEnumerator partition = partitionerPartitions[i]; if (partition == null) { throw new InvalidOperationException(SR.GetString(SR.PartitionerQueryOperator_NullPartition)); } partitions[i] = new PartitionerEnumerator(partition); } } recipient.Receive (partitions); } } /// /// Enumerator that converts an enumerator over key-value pairs exposed by a partitioner /// to a QueryOperatorEnumerator used by PLINQ internally. /// private class OrderablePartitionerEnumerator : QueryOperatorEnumerator{ private IEnumerator > m_sourceEnumerator; internal OrderablePartitionerEnumerator(IEnumerator > sourceEnumerator) { m_sourceEnumerator = sourceEnumerator; } internal override bool MoveNext(ref TElement currentElement, ref int currentKey) { if (!m_sourceEnumerator.MoveNext()) return false; KeyValuePair current = m_sourceEnumerator.Current; currentElement = current.Value; checked { currentKey = (int)current.Key; } return true; } protected override void Dispose(bool disposing) { Contract.Assert(m_sourceEnumerator != null); m_sourceEnumerator.Dispose(); } } /// /// Enumerator that converts an enumerator over key-value pairs exposed by a partitioner /// to a QueryOperatorEnumerator used by PLINQ internally. /// private class PartitionerEnumerator : QueryOperatorEnumerator{ private IEnumerator m_sourceEnumerator; internal PartitionerEnumerator(IEnumerator sourceEnumerator) { m_sourceEnumerator = sourceEnumerator; } internal override bool MoveNext(ref TElement currentElement, ref int currentKey) { if (!m_sourceEnumerator.MoveNext()) return false; currentElement = m_sourceEnumerator.Current; currentKey = 0; return true; } protected override void Dispose(bool disposing) { Contract.Assert(m_sourceEnumerator != null); m_sourceEnumerator.Dispose(); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- EntityParameterCollection.cs
- NativeMethods.cs
- CellPartitioner.cs
- ConstNode.cs
- EntityTypeEmitter.cs
- Expressions.cs
- ConfigurationPermission.cs
- XmlResolver.cs
- Constraint.cs
- EpmSyndicationContentSerializer.cs
- XPathMultyIterator.cs
- DataGridRowClipboardEventArgs.cs
- TableLayoutPanelDesigner.cs
- ReachObjectContext.cs
- TextRunCacheImp.cs
- DesignTimeData.cs
- BindUriHelper.cs
- FormViewRow.cs
- ExpressionServices.cs
- BulletChrome.cs
- FilterEventArgs.cs
- EntityReference.cs
- GridViewRow.cs
- FontWeight.cs
- QuaternionAnimation.cs
- ProcessProtocolHandler.cs
- QualifiedCellIdBoolean.cs
- ValidationVisibilityAttribute.cs
- File.cs
- ContainerUtilities.cs
- DataPagerFieldCommandEventArgs.cs
- ExceptionValidationRule.cs
- SafeLocalMemHandle.cs
- CodeBinaryOperatorExpression.cs
- TextEffectResolver.cs
- UnaryQueryOperator.cs
- XmlElementAttributes.cs
- BooleanToSelectiveScrollingOrientationConverter.cs
- Bold.cs
- RadioButtonFlatAdapter.cs
- InvalidOperationException.cs
- SessionPageStatePersister.cs
- NameValuePermission.cs
- OnOperation.cs
- GridLength.cs
- CursorConverter.cs
- Authorization.cs
- ProjectionNode.cs
- SafeArrayRankMismatchException.cs
- SaveFileDialog.cs
- ChameleonKey.cs
- SQLMembershipProvider.cs
- LightweightCodeGenerator.cs
- ServiceContractGenerator.cs
- ListView.cs
- login.cs
- TypeSystem.cs
- DataControlButton.cs
- WorkflowMarkupSerializerMapping.cs
- MarkupProperty.cs
- DataObjectCopyingEventArgs.cs
- StylusPointDescription.cs
- XPathQueryGenerator.cs
- TextEditorCopyPaste.cs
- EdmToObjectNamespaceMap.cs
- ManualResetEventSlim.cs
- ClientSettingsSection.cs
- BitmapEffectInput.cs
- FormViewModeEventArgs.cs
- OdbcConnectionPoolProviderInfo.cs
- CaseInsensitiveOrdinalStringComparer.cs
- DocumentApplicationJournalEntry.cs
- XmlEncodedRawTextWriter.cs
- ExpanderAutomationPeer.cs
- MD5.cs
- TextDecorationLocationValidation.cs
- TextEditorSpelling.cs
- QueryStringParameter.cs
- XmlComment.cs
- SignatureDescription.cs
- codemethodreferenceexpression.cs
- ContentPosition.cs
- FileAuthorizationModule.cs
- MergeLocalizationDirectives.cs
- GridViewRowPresenter.cs
- UnsafeNativeMethods.cs
- Configuration.cs
- FrameworkReadOnlyPropertyMetadata.cs
- Enlistment.cs
- TextDecorationUnitValidation.cs
- EmptyEnumerator.cs
- URLIdentityPermission.cs
- QilIterator.cs
- ArglessEventHandlerProxy.cs
- RemoteArgument.cs
- SqlPersonalizationProvider.cs
- BooleanConverter.cs
- CmsInterop.cs
- CommandField.cs
- ProvideValueServiceProvider.cs