Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / System / Linq / Parallel / QueryOperators / Binary / ExceptQueryOperator.cs / 1305376 / ExceptQueryOperator.cs
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
// =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
//
// ExceptQueryOperator.cs
//
// [....]
//
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.Threading;
namespace System.Linq.Parallel
{
///
/// Operator that yields the elements from the first data source that aren't in the second.
/// This is known as the set relative complement, i.e. left - right.
///
/// :
BinaryQueryOperator
{
private readonly IEqualityComparer m_comparer; // An equality comparer.
//----------------------------------------------------------------------------------------
// Constructs a new set except operator.
//
internal ExceptQueryOperator(ParallelQuery left, ParallelQuery right, IEqualityComparer comparer)
:base(left, right)
{
Contract.Assert(left != null && right != null, "child data sources cannot be null");
m_comparer = comparer;
m_outputOrdered = LeftChild.OutputOrdered;
SetOrdinalIndex(OrdinalIndexState.Shuffled);
}
internal override QueryResults Open(
QuerySettings settings, bool preferStriping)
{
// We just open our child operators, left and then right. Do not propagate the preferStriping value, but
// instead explicitly set it to false. Regardless of whether the parent prefers striping or range
// partitioning, the output will be hash-partititioned.
QueryResults leftChildResults = LeftChild.Open(settings, false);
QueryResults rightChildResults = RightChild.Open(settings, false);
return new BinaryQueryOperatorResults(leftChildResults, rightChildResults, this, settings, false);
}
public override void WrapPartitionedStream(
PartitionedStream leftStream, PartitionedStream rightStream,
IPartitionedStreamRecipient outputRecipient, bool preferStriping, QuerySettings settings)
{
Contract.Assert(leftStream.PartitionCount == rightStream.PartitionCount);
if (OutputOrdered)
{
WrapPartitionedStreamHelper(
ExchangeUtilities.HashRepartitionOrdered(
leftStream, null, null, m_comparer, settings.CancellationState.MergedCancellationToken),
rightStream, outputRecipient, settings.CancellationState.MergedCancellationToken);
}
else
{
WrapPartitionedStreamHelper(
ExchangeUtilities.HashRepartition(
leftStream, null, null, m_comparer, settings.CancellationState.MergedCancellationToken),
rightStream, outputRecipient, settings.CancellationState.MergedCancellationToken);
}
}
//---------------------------------------------------------------------------------------
// This is a helper method. WrapPartitionedStream decides what type TLeftKey is going
// to be, and then call this method with that key as a generic parameter.
//
private void WrapPartitionedStreamHelper(
PartitionedStream, TLeftKey> leftHashStream, PartitionedStream rightPartitionedStream,
IPartitionedStreamRecipient outputRecipient, CancellationToken cancellationToken)
{
int partitionCount = leftHashStream.PartitionCount;
PartitionedStream, int> rightHashStream =
ExchangeUtilities.HashRepartition(
rightPartitionedStream, null, null, m_comparer, cancellationToken);
PartitionedStream outputStream =
new PartitionedStream(partitionCount, leftHashStream.KeyComparer, OrdinalIndexState.Shuffled);
for (int i = 0; i < partitionCount; i++)
{
if (OutputOrdered)
{
outputStream[i] = new OrderedExceptQueryOperatorEnumerator(
leftHashStream[i], rightHashStream[i], m_comparer, leftHashStream.KeyComparer, cancellationToken);
}
else
{
outputStream[i] = (QueryOperatorEnumerator)(object)
new ExceptQueryOperatorEnumerator(leftHashStream[i], rightHashStream[i], m_comparer, cancellationToken);
}
}
outputRecipient.Receive(outputStream);
}
//---------------------------------------------------------------------------------------
// Returns an enumerable that represents the query executing sequentially.
//
internal override IEnumerable AsSequentialQuery(CancellationToken token)
{
IEnumerable wrappedLeftChild = CancellableEnumerable.Wrap(LeftChild.AsSequentialQuery(token), token);
IEnumerable wrappedRightChild = CancellableEnumerable.Wrap(RightChild.AsSequentialQuery(token), token);
return wrappedLeftChild.Except(wrappedRightChild, m_comparer);
}
//---------------------------------------------------------------------------------------
// Whether this operator performs a premature merge.
//
internal override bool LimitsParallelism
{
get { return false; }
}
//----------------------------------------------------------------------------------------
// This enumerator calculates the distinct set incrementally. It does this by maintaining
// a history -- in the form of a set -- of all data already seen. It then only returns
// elements that have not yet been seen.
//
class ExceptQueryOperatorEnumerator : QueryOperatorEnumerator
{
private QueryOperatorEnumerator, TLeftKey> m_leftSource; // Left data source.
private QueryOperatorEnumerator, int> m_rightSource; // Right data source.
private IEqualityComparer m_comparer; // A comparer used for equality checks/hash-coding.
private Set m_hashLookup; // The hash lookup, used to produce the distinct set.
private CancellationToken m_cancellationToken;
private Shared m_outputLoopCount;
//---------------------------------------------------------------------------------------
// Instantiates a new except query operator enumerator.
//
internal ExceptQueryOperatorEnumerator(
QueryOperatorEnumerator, TLeftKey> leftSource,
QueryOperatorEnumerator, int> rightSource,
IEqualityComparer comparer,
CancellationToken cancellationToken)
{
Contract.Assert(leftSource != null);
Contract.Assert(rightSource != null);
m_leftSource = leftSource;
m_rightSource = rightSource;
m_comparer = comparer;
m_cancellationToken = cancellationToken;
}
//----------------------------------------------------------------------------------------
// Walks the two data sources, left and then right, to produce the distinct set
//
internal override bool MoveNext(ref TInputOutput currentElement, ref int currentKey)
{
Contract.Assert(m_leftSource != null);
Contract.Assert(m_rightSource != null);
// Build the set out of the left data source, if we haven't already.
if (m_hashLookup == null)
{
m_outputLoopCount = new Shared(0);
// @
m_hashLookup = new Set(m_comparer);
Pair rightElement = default(Pair);
int rightKeyUnused = default(int);
int i = 0;
while (m_rightSource.MoveNext(ref rightElement, ref rightKeyUnused))
{
if ((i++ & CancellationState.POLL_INTERVAL) == 0)
CancellationState.ThrowIfCanceled(m_cancellationToken);
m_hashLookup.Add(rightElement.First);
}
}
// Now iterate over the right data source, looking for matches.
Pair leftElement = default(Pair);
TLeftKey leftKeyUnused = default(TLeftKey);
while (m_leftSource.MoveNext(ref leftElement, ref leftKeyUnused))
{
if ((m_outputLoopCount.Value++ & CancellationState.POLL_INTERVAL) == 0)
CancellationState.ThrowIfCanceled(m_cancellationToken);
if (m_hashLookup.Add(leftElement.First))
{
// This element has never been seen. Return it.
currentElement = leftElement.First;
#if DEBUG
currentKey = unchecked((int)0xdeadbeef);
#endif
return true;
}
}
return false;
}
protected override void Dispose(bool disposing)
{
Contract.Assert(m_leftSource != null && m_rightSource != null);
m_leftSource.Dispose();
m_rightSource.Dispose();
}
}
class OrderedExceptQueryOperatorEnumerator : QueryOperatorEnumerator
{
private QueryOperatorEnumerator, TLeftKey> m_leftSource; // Left data source.
private QueryOperatorEnumerator, int> m_rightSource; // Right data source.
private IEqualityComparer m_comparer; // A comparer used for equality checks/hash-coding.
private IComparer m_leftKeyComparer; // A comparer for order keys.
private IEnumerator, Pair>> m_outputEnumerator; // The enumerator output elements + order keys.
private CancellationToken m_cancellationToken;
//----------------------------------------------------------------------------------------
// Instantiates a new except query operator enumerator.
//
internal OrderedExceptQueryOperatorEnumerator(
QueryOperatorEnumerator, TLeftKey> leftSource,
QueryOperatorEnumerator, int> rightSource,
IEqualityComparer comparer, IComparer leftKeyComparer,
CancellationToken cancellationToken)
{
Contract.Assert(leftSource != null);
Contract.Assert(rightSource != null);
m_leftSource = leftSource;
m_rightSource = rightSource;
m_comparer = comparer;
m_leftKeyComparer = leftKeyComparer;
m_cancellationToken = cancellationToken;
}
//---------------------------------------------------------------------------------------
// Walks the two data sources, left and then right, to produce the distinct set
//
internal override bool MoveNext(ref TInputOutput currentElement, ref TLeftKey currentKey)
{
Contract.Assert(m_leftSource != null);
Contract.Assert(m_rightSource != null);
// Build the set out of the left data source, if we haven't already.
if (m_outputEnumerator == null)
{
// @
Set rightLookup = new Set(m_comparer);
Pair rightElement = default(Pair);
int rightKeyUnused = default(int);
int i=0;
while (m_rightSource.MoveNext(ref rightElement, ref rightKeyUnused))
{
if ((i++ & CancellationState.POLL_INTERVAL) == 0)
CancellationState.ThrowIfCanceled(m_cancellationToken);
rightLookup.Add(rightElement.First);
}
var leftLookup =
new Dictionary, Pair>(
new WrapperEqualityComparer(m_comparer));
Pair leftElement = default(Pair);
TLeftKey leftKey = default(TLeftKey);
while (m_leftSource.MoveNext(ref leftElement, ref leftKey))
{
if ((i++ & CancellationState.POLL_INTERVAL) == 0)
CancellationState.ThrowIfCanceled(m_cancellationToken);
if (rightLookup.Contains(leftElement.First))
{
continue;
}
Pair oldEntry;
Wrapper wrappedLeftElement = new Wrapper(leftElement.First);
if (!leftLookup.TryGetValue(wrappedLeftElement, out oldEntry) || m_leftKeyComparer.Compare(leftKey, oldEntry.Second) < 0)
{
// For each "elem" value, we store the smallest key, and the element value that had that key.
// Note that even though two element values are "equal" according to the EqualityComparer,
// we still cannot choose arbitrarily which of the two to yield.
leftLookup[wrappedLeftElement] = new Pair(leftElement.First, leftKey);
}
}
m_outputEnumerator = leftLookup.GetEnumerator();
}
if (m_outputEnumerator.MoveNext())
{
Pair currentPair = m_outputEnumerator.Current.Value;
currentElement = currentPair.First;
currentKey = currentPair.Second;
return true;
}
return false;
}
protected override void Dispose(bool disposing)
{
Contract.Assert(m_leftSource != null && m_rightSource != null);
m_leftSource.Dispose();
m_rightSource.Dispose();
}
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
// =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
//
// ExceptQueryOperator.cs
//
// [....]
//
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.Threading;
namespace System.Linq.Parallel
{
///
/// Operator that yields the elements from the first data source that aren't in the second.
/// This is known as the set relative complement, i.e. left - right.
///
/// :
BinaryQueryOperator
{
private readonly IEqualityComparer m_comparer; // An equality comparer.
//----------------------------------------------------------------------------------------
// Constructs a new set except operator.
//
internal ExceptQueryOperator(ParallelQuery left, ParallelQuery right, IEqualityComparer comparer)
:base(left, right)
{
Contract.Assert(left != null && right != null, "child data sources cannot be null");
m_comparer = comparer;
m_outputOrdered = LeftChild.OutputOrdered;
SetOrdinalIndex(OrdinalIndexState.Shuffled);
}
internal override QueryResults Open(
QuerySettings settings, bool preferStriping)
{
// We just open our child operators, left and then right. Do not propagate the preferStriping value, but
// instead explicitly set it to false. Regardless of whether the parent prefers striping or range
// partitioning, the output will be hash-partititioned.
QueryResults leftChildResults = LeftChild.Open(settings, false);
QueryResults rightChildResults = RightChild.Open(settings, false);
return new BinaryQueryOperatorResults(leftChildResults, rightChildResults, this, settings, false);
}
public override void WrapPartitionedStream(
PartitionedStream leftStream, PartitionedStream rightStream,
IPartitionedStreamRecipient outputRecipient, bool preferStriping, QuerySettings settings)
{
Contract.Assert(leftStream.PartitionCount == rightStream.PartitionCount);
if (OutputOrdered)
{
WrapPartitionedStreamHelper(
ExchangeUtilities.HashRepartitionOrdered(
leftStream, null, null, m_comparer, settings.CancellationState.MergedCancellationToken),
rightStream, outputRecipient, settings.CancellationState.MergedCancellationToken);
}
else
{
WrapPartitionedStreamHelper(
ExchangeUtilities.HashRepartition(
leftStream, null, null, m_comparer, settings.CancellationState.MergedCancellationToken),
rightStream, outputRecipient, settings.CancellationState.MergedCancellationToken);
}
}
//---------------------------------------------------------------------------------------
// This is a helper method. WrapPartitionedStream decides what type TLeftKey is going
// to be, and then call this method with that key as a generic parameter.
//
private void WrapPartitionedStreamHelper(
PartitionedStream, TLeftKey> leftHashStream, PartitionedStream rightPartitionedStream,
IPartitionedStreamRecipient outputRecipient, CancellationToken cancellationToken)
{
int partitionCount = leftHashStream.PartitionCount;
PartitionedStream, int> rightHashStream =
ExchangeUtilities.HashRepartition(
rightPartitionedStream, null, null, m_comparer, cancellationToken);
PartitionedStream outputStream =
new PartitionedStream(partitionCount, leftHashStream.KeyComparer, OrdinalIndexState.Shuffled);
for (int i = 0; i < partitionCount; i++)
{
if (OutputOrdered)
{
outputStream[i] = new OrderedExceptQueryOperatorEnumerator(
leftHashStream[i], rightHashStream[i], m_comparer, leftHashStream.KeyComparer, cancellationToken);
}
else
{
outputStream[i] = (QueryOperatorEnumerator)(object)
new ExceptQueryOperatorEnumerator(leftHashStream[i], rightHashStream[i], m_comparer, cancellationToken);
}
}
outputRecipient.Receive(outputStream);
}
//---------------------------------------------------------------------------------------
// Returns an enumerable that represents the query executing sequentially.
//
internal override IEnumerable AsSequentialQuery(CancellationToken token)
{
IEnumerable wrappedLeftChild = CancellableEnumerable.Wrap(LeftChild.AsSequentialQuery(token), token);
IEnumerable wrappedRightChild = CancellableEnumerable.Wrap(RightChild.AsSequentialQuery(token), token);
return wrappedLeftChild.Except(wrappedRightChild, m_comparer);
}
//---------------------------------------------------------------------------------------
// Whether this operator performs a premature merge.
//
internal override bool LimitsParallelism
{
get { return false; }
}
//----------------------------------------------------------------------------------------
// This enumerator calculates the distinct set incrementally. It does this by maintaining
// a history -- in the form of a set -- of all data already seen. It then only returns
// elements that have not yet been seen.
//
class ExceptQueryOperatorEnumerator : QueryOperatorEnumerator
{
private QueryOperatorEnumerator, TLeftKey> m_leftSource; // Left data source.
private QueryOperatorEnumerator, int> m_rightSource; // Right data source.
private IEqualityComparer m_comparer; // A comparer used for equality checks/hash-coding.
private Set m_hashLookup; // The hash lookup, used to produce the distinct set.
private CancellationToken m_cancellationToken;
private Shared m_outputLoopCount;
//---------------------------------------------------------------------------------------
// Instantiates a new except query operator enumerator.
//
internal ExceptQueryOperatorEnumerator(
QueryOperatorEnumerator, TLeftKey> leftSource,
QueryOperatorEnumerator, int> rightSource,
IEqualityComparer comparer,
CancellationToken cancellationToken)
{
Contract.Assert(leftSource != null);
Contract.Assert(rightSource != null);
m_leftSource = leftSource;
m_rightSource = rightSource;
m_comparer = comparer;
m_cancellationToken = cancellationToken;
}
//----------------------------------------------------------------------------------------
// Walks the two data sources, left and then right, to produce the distinct set
//
internal override bool MoveNext(ref TInputOutput currentElement, ref int currentKey)
{
Contract.Assert(m_leftSource != null);
Contract.Assert(m_rightSource != null);
// Build the set out of the left data source, if we haven't already.
if (m_hashLookup == null)
{
m_outputLoopCount = new Shared(0);
// @
m_hashLookup = new Set(m_comparer);
Pair rightElement = default(Pair);
int rightKeyUnused = default(int);
int i = 0;
while (m_rightSource.MoveNext(ref rightElement, ref rightKeyUnused))
{
if ((i++ & CancellationState.POLL_INTERVAL) == 0)
CancellationState.ThrowIfCanceled(m_cancellationToken);
m_hashLookup.Add(rightElement.First);
}
}
// Now iterate over the right data source, looking for matches.
Pair leftElement = default(Pair);
TLeftKey leftKeyUnused = default(TLeftKey);
while (m_leftSource.MoveNext(ref leftElement, ref leftKeyUnused))
{
if ((m_outputLoopCount.Value++ & CancellationState.POLL_INTERVAL) == 0)
CancellationState.ThrowIfCanceled(m_cancellationToken);
if (m_hashLookup.Add(leftElement.First))
{
// This element has never been seen. Return it.
currentElement = leftElement.First;
#if DEBUG
currentKey = unchecked((int)0xdeadbeef);
#endif
return true;
}
}
return false;
}
protected override void Dispose(bool disposing)
{
Contract.Assert(m_leftSource != null && m_rightSource != null);
m_leftSource.Dispose();
m_rightSource.Dispose();
}
}
class OrderedExceptQueryOperatorEnumerator : QueryOperatorEnumerator
{
private QueryOperatorEnumerator, TLeftKey> m_leftSource; // Left data source.
private QueryOperatorEnumerator, int> m_rightSource; // Right data source.
private IEqualityComparer m_comparer; // A comparer used for equality checks/hash-coding.
private IComparer m_leftKeyComparer; // A comparer for order keys.
private IEnumerator, Pair>> m_outputEnumerator; // The enumerator output elements + order keys.
private CancellationToken m_cancellationToken;
//----------------------------------------------------------------------------------------
// Instantiates a new except query operator enumerator.
//
internal OrderedExceptQueryOperatorEnumerator(
QueryOperatorEnumerator, TLeftKey> leftSource,
QueryOperatorEnumerator, int> rightSource,
IEqualityComparer comparer, IComparer leftKeyComparer,
CancellationToken cancellationToken)
{
Contract.Assert(leftSource != null);
Contract.Assert(rightSource != null);
m_leftSource = leftSource;
m_rightSource = rightSource;
m_comparer = comparer;
m_leftKeyComparer = leftKeyComparer;
m_cancellationToken = cancellationToken;
}
//---------------------------------------------------------------------------------------
// Walks the two data sources, left and then right, to produce the distinct set
//
internal override bool MoveNext(ref TInputOutput currentElement, ref TLeftKey currentKey)
{
Contract.Assert(m_leftSource != null);
Contract.Assert(m_rightSource != null);
// Build the set out of the left data source, if we haven't already.
if (m_outputEnumerator == null)
{
// @
Set rightLookup = new Set(m_comparer);
Pair rightElement = default(Pair);
int rightKeyUnused = default(int);
int i=0;
while (m_rightSource.MoveNext(ref rightElement, ref rightKeyUnused))
{
if ((i++ & CancellationState.POLL_INTERVAL) == 0)
CancellationState.ThrowIfCanceled(m_cancellationToken);
rightLookup.Add(rightElement.First);
}
var leftLookup =
new Dictionary, Pair>(
new WrapperEqualityComparer(m_comparer));
Pair leftElement = default(Pair);
TLeftKey leftKey = default(TLeftKey);
while (m_leftSource.MoveNext(ref leftElement, ref leftKey))
{
if ((i++ & CancellationState.POLL_INTERVAL) == 0)
CancellationState.ThrowIfCanceled(m_cancellationToken);
if (rightLookup.Contains(leftElement.First))
{
continue;
}
Pair oldEntry;
Wrapper wrappedLeftElement = new Wrapper(leftElement.First);
if (!leftLookup.TryGetValue(wrappedLeftElement, out oldEntry) || m_leftKeyComparer.Compare(leftKey, oldEntry.Second) < 0)
{
// For each "elem" value, we store the smallest key, and the element value that had that key.
// Note that even though two element values are "equal" according to the EqualityComparer,
// we still cannot choose arbitrarily which of the two to yield.
leftLookup[wrappedLeftElement] = new Pair(leftElement.First, leftKey);
}
}
m_outputEnumerator = leftLookup.GetEnumerator();
}
if (m_outputEnumerator.MoveNext())
{
Pair currentPair = m_outputEnumerator.Current.Value;
currentElement = currentPair.First;
currentKey = currentPair.Second;
return true;
}
return false;
}
protected override void Dispose(bool disposing)
{
Contract.Assert(m_leftSource != null && m_rightSource != null);
m_leftSource.Dispose();
m_rightSource.Dispose();
}
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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