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Refactor RelationalShapedQueryCompilingExpressionVisitor
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35 changes: 35 additions & 0 deletions
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src/EFCore.Relational/Query/Internal/CollectionMaterializationContext.cs
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// Copyright (c) .NET Foundation. All rights reserved. | ||
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. | ||
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namespace Microsoft.EntityFrameworkCore.Query.Internal | ||
{ | ||
/// <summary> | ||
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to | ||
/// the same compatibility standards as public APIs. It may be changed or removed without notice in | ||
/// any release. You should only use it directly in your code with extreme caution and knowing that | ||
/// doing so can result in application failures when updating to a new Entity Framework Core release. | ||
/// </summary> | ||
public class CollectionMaterializationContext | ||
{ | ||
public CollectionMaterializationContext(object parent, object collection, object[] parentIdentifier, object[] outerIdentifier) | ||
{ | ||
Parent = parent; | ||
Collection = collection; | ||
ParentIdentifier = parentIdentifier; | ||
OuterIdentifier = outerIdentifier; | ||
ResultContext = new ResultContext(); | ||
} | ||
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public virtual ResultContext ResultContext { get; } | ||
public virtual object Parent { get; } | ||
public virtual object Collection { get; } | ||
public virtual object[] ParentIdentifier { get; } | ||
public virtual object[] OuterIdentifier { get; } | ||
public virtual object[] SelfIdentifier { get; private set; } | ||
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public virtual void UpdateSelfIdentifier(object[] selfIdentifier) | ||
{ | ||
SelfIdentifier = selfIdentifier; | ||
} | ||
} | ||
} |
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src/EFCore.Relational/Query/Internal/ParameterValueBasedSelectExpressionOptimizer.cs
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src/EFCore.Relational/Query/Internal/QueryingEnumerable.cs
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// Copyright (c) .NET Foundation. All rights reserved. | ||
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. | ||
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using System; | ||
using System.Collections; | ||
using System.Collections.Generic; | ||
using System.Data.Common; | ||
using System.Linq; | ||
using System.Threading; | ||
using System.Threading.Tasks; | ||
using Microsoft.EntityFrameworkCore.Diagnostics; | ||
using Microsoft.EntityFrameworkCore.Storage; | ||
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namespace Microsoft.EntityFrameworkCore.Query.Internal | ||
{ | ||
/// <summary> | ||
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to | ||
/// the same compatibility standards as public APIs. It may be changed or removed without notice in | ||
/// any release. You should only use it directly in your code with extreme caution and knowing that | ||
/// doing so can result in application failures when updating to a new Entity Framework Core release. | ||
/// </summary> | ||
public class QueryingEnumerable<T> : IEnumerable<T>, IAsyncEnumerable<T> | ||
{ | ||
private readonly RelationalQueryContext _relationalQueryContext; | ||
private readonly RelationalCommandCache _relationalCommandCache; | ||
private readonly IReadOnlyList<string> _columnNames; | ||
private readonly Func<QueryContext, DbDataReader, ResultContext, int[], ResultCoordinator, T> _shaper; | ||
private readonly Type _contextType; | ||
private readonly IDiagnosticsLogger<DbLoggerCategory.Query> _logger; | ||
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public QueryingEnumerable( | ||
RelationalQueryContext relationalQueryContext, | ||
RelationalCommandCache relationalCommandCache, | ||
IReadOnlyList<string> columnNames, | ||
Func<QueryContext, DbDataReader, ResultContext, int[], ResultCoordinator, T> shaper, | ||
Type contextType, | ||
IDiagnosticsLogger<DbLoggerCategory.Query> logger) | ||
{ | ||
_relationalQueryContext = relationalQueryContext; | ||
_relationalCommandCache = relationalCommandCache; | ||
_columnNames = columnNames; | ||
_shaper = shaper; | ||
_contextType = contextType; | ||
_logger = logger; | ||
} | ||
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public virtual IAsyncEnumerator<T> GetAsyncEnumerator(CancellationToken cancellationToken = default) | ||
=> new AsyncEnumerator(this, cancellationToken); | ||
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public virtual IEnumerator<T> GetEnumerator() => new Enumerator(this); | ||
IEnumerator IEnumerable.GetEnumerator() => GetEnumerator(); | ||
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private sealed class Enumerator : IEnumerator<T> | ||
{ | ||
private readonly RelationalQueryContext _relationalQueryContext; | ||
private readonly RelationalCommandCache _relationalCommandCache; | ||
private readonly IReadOnlyList<string> _columnNames; | ||
private readonly Func<QueryContext, DbDataReader, ResultContext, int[], ResultCoordinator, T> _shaper; | ||
private readonly Type _contextType; | ||
private readonly IDiagnosticsLogger<DbLoggerCategory.Query> _logger; | ||
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private RelationalDataReader _dataReader; | ||
private int[] _indexMap; | ||
private ResultCoordinator _resultCoordinator; | ||
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public Enumerator(QueryingEnumerable<T> queryingEnumerable) | ||
{ | ||
_relationalQueryContext = queryingEnumerable._relationalQueryContext; | ||
_relationalCommandCache = queryingEnumerable._relationalCommandCache; | ||
_columnNames = queryingEnumerable._columnNames; | ||
_shaper = queryingEnumerable._shaper; | ||
_contextType = queryingEnumerable._contextType; | ||
_logger = queryingEnumerable._logger; | ||
} | ||
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public T Current { get; private set; } | ||
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object IEnumerator.Current => Current; | ||
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public bool MoveNext() | ||
{ | ||
try | ||
{ | ||
using (_relationalQueryContext.ConcurrencyDetector.EnterCriticalSection()) | ||
{ | ||
if (_dataReader == null) | ||
{ | ||
var relationalCommand = _relationalCommandCache.GetRelationalCommand( | ||
_relationalQueryContext.ParameterValues); | ||
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_dataReader | ||
= relationalCommand.ExecuteReader( | ||
new RelationalCommandParameterObject( | ||
_relationalQueryContext.Connection, | ||
_relationalQueryContext.ParameterValues, | ||
_relationalQueryContext.Context, | ||
_relationalQueryContext.CommandLogger)); | ||
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// Non-Composed FromSql | ||
if (_columnNames != null) | ||
{ | ||
var readerColumns = Enumerable.Range(0, _dataReader.DbDataReader.FieldCount) | ||
.ToDictionary(i => _dataReader.DbDataReader.GetName(i), i => i, StringComparer.OrdinalIgnoreCase); | ||
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_indexMap = new int[_columnNames.Count]; | ||
for (var i = 0; i < _columnNames.Count; i++) | ||
{ | ||
var columnName = _columnNames[i]; | ||
if (!readerColumns.TryGetValue(columnName, out var ordinal)) | ||
{ | ||
throw new InvalidOperationException(RelationalStrings.FromSqlMissingColumn(columnName)); | ||
} | ||
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_indexMap[i] = ordinal; | ||
} | ||
} | ||
else | ||
{ | ||
_indexMap = null; | ||
} | ||
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_resultCoordinator = new ResultCoordinator(); | ||
} | ||
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var hasNext = _resultCoordinator.HasNext ?? _dataReader.Read(); | ||
Current = default; | ||
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if (hasNext) | ||
{ | ||
while (true) | ||
{ | ||
_resultCoordinator.ResultReady = true; | ||
_resultCoordinator.HasNext = null; | ||
Current = _shaper( | ||
_relationalQueryContext, _dataReader.DbDataReader, | ||
_resultCoordinator.ResultContext, _indexMap, _resultCoordinator); | ||
if (_resultCoordinator.ResultReady) | ||
{ | ||
// We generated a result so null out previously stored values | ||
_resultCoordinator.ResultContext.Values = null; | ||
break; | ||
} | ||
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if (!_dataReader.Read()) | ||
{ | ||
_resultCoordinator.HasNext = false; | ||
// Enumeration has ended, materialize last element | ||
_resultCoordinator.ResultReady = true; | ||
Current = _shaper( | ||
_relationalQueryContext, _dataReader.DbDataReader, | ||
_resultCoordinator.ResultContext, _indexMap, _resultCoordinator); | ||
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break; | ||
} | ||
} | ||
} | ||
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return hasNext; | ||
} | ||
} | ||
catch (Exception exception) | ||
{ | ||
_logger.QueryIterationFailed(_contextType, exception); | ||
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throw; | ||
} | ||
} | ||
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public void Dispose() | ||
{ | ||
_dataReader?.Dispose(); | ||
_dataReader = null; | ||
} | ||
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public void Reset() => throw new NotImplementedException(); | ||
} | ||
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private sealed class AsyncEnumerator : IAsyncEnumerator<T> | ||
{ | ||
private readonly RelationalQueryContext _relationalQueryContext; | ||
private readonly RelationalCommandCache _relationalCommandCache; | ||
private readonly IReadOnlyList<string> _columnNames; | ||
private readonly Func<QueryContext, DbDataReader, ResultContext, int[], ResultCoordinator, T> _shaper; | ||
private readonly Type _contextType; | ||
private readonly IDiagnosticsLogger<DbLoggerCategory.Query> _logger; | ||
private readonly CancellationToken _cancellationToken; | ||
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private RelationalDataReader _dataReader; | ||
private int[] _indexMap; | ||
private ResultCoordinator _resultCoordinator; | ||
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public AsyncEnumerator( | ||
QueryingEnumerable<T> queryingEnumerable, | ||
CancellationToken cancellationToken) | ||
{ | ||
_relationalQueryContext = queryingEnumerable._relationalQueryContext; | ||
_relationalCommandCache = queryingEnumerable._relationalCommandCache; | ||
_columnNames = queryingEnumerable._columnNames; | ||
_shaper = queryingEnumerable._shaper; | ||
_contextType = queryingEnumerable._contextType; | ||
_logger = queryingEnumerable._logger; | ||
_cancellationToken = cancellationToken; | ||
} | ||
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public T Current { get; private set; } | ||
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public async ValueTask<bool> MoveNextAsync() | ||
{ | ||
try | ||
{ | ||
using (_relationalQueryContext.ConcurrencyDetector.EnterCriticalSection()) | ||
{ | ||
if (_dataReader == null) | ||
{ | ||
var relationalCommand = _relationalCommandCache.GetRelationalCommand( | ||
_relationalQueryContext.ParameterValues); | ||
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_dataReader | ||
= await relationalCommand.ExecuteReaderAsync( | ||
new RelationalCommandParameterObject( | ||
_relationalQueryContext.Connection, | ||
_relationalQueryContext.ParameterValues, | ||
_relationalQueryContext.Context, | ||
_relationalQueryContext.CommandLogger), | ||
_cancellationToken); | ||
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// Non-Composed FromSql | ||
if (_columnNames != null) | ||
{ | ||
var readerColumns = Enumerable.Range(0, _dataReader.DbDataReader.FieldCount) | ||
.ToDictionary(i => _dataReader.DbDataReader.GetName(i), i => i, StringComparer.OrdinalIgnoreCase); | ||
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_indexMap = new int[_columnNames.Count]; | ||
for (var i = 0; i < _columnNames.Count; i++) | ||
{ | ||
var columnName = _columnNames[i]; | ||
if (!readerColumns.TryGetValue(columnName, out var ordinal)) | ||
{ | ||
throw new InvalidOperationException(RelationalStrings.FromSqlMissingColumn(columnName)); | ||
} | ||
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_indexMap[i] = ordinal; | ||
} | ||
} | ||
else | ||
{ | ||
_indexMap = null; | ||
} | ||
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_resultCoordinator = new ResultCoordinator(); | ||
} | ||
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var hasNext = _resultCoordinator.HasNext ?? await _dataReader.ReadAsync(_cancellationToken); | ||
Current = default; | ||
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if (hasNext) | ||
{ | ||
while (true) | ||
{ | ||
_resultCoordinator.ResultReady = true; | ||
_resultCoordinator.HasNext = null; | ||
Current = _shaper( | ||
_relationalQueryContext, _dataReader.DbDataReader, | ||
_resultCoordinator.ResultContext, _indexMap, _resultCoordinator); | ||
if (_resultCoordinator.ResultReady) | ||
{ | ||
// We generated a result so null out previously stored values | ||
_resultCoordinator.ResultContext.Values = null; | ||
break; | ||
} | ||
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if (!await _dataReader.ReadAsync(_cancellationToken)) | ||
{ | ||
_resultCoordinator.HasNext = false; | ||
// Enumeration has ended, materialize last element | ||
_resultCoordinator.ResultReady = true; | ||
Current = _shaper( | ||
_relationalQueryContext, _dataReader.DbDataReader, | ||
_resultCoordinator.ResultContext, _indexMap, _resultCoordinator); | ||
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break; | ||
} | ||
} | ||
} | ||
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return hasNext; | ||
} | ||
} | ||
catch (Exception exception) | ||
{ | ||
_logger.QueryIterationFailed(_contextType, exception); | ||
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throw; | ||
} | ||
} | ||
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public ValueTask DisposeAsync() | ||
{ | ||
if (_dataReader != null) | ||
{ | ||
var dataReader = _dataReader; | ||
_dataReader = null; | ||
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return dataReader.DisposeAsync(); | ||
} | ||
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return default; | ||
} | ||
} | ||
} | ||
} |
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