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SingleQueryingEnumerable.cs
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SingleQueryingEnumerable.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Collections;
using Microsoft.EntityFrameworkCore.Internal;
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 static class SingleQueryingEnumerable
{
/// <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 static SingleQueryingEnumerable<T> Create<T>(
RelationalQueryContext relationalQueryContext,
RelationalCommandResolver relationalCommandResolver,
IReadOnlyList<ReaderColumn?>? readerColumns,
Func<QueryContext, DbDataReader, ResultContext, SingleQueryResultCoordinator, T> shaper,
Type contextType,
bool standAloneStateManager,
bool detailedErrorsEnabled,
bool threadSafetyChecksEnabled)
=> new(
relationalQueryContext,
relationalCommandResolver,
readerColumns,
shaper,
contextType,
standAloneStateManager,
detailedErrorsEnabled,
threadSafetyChecksEnabled);
}
/// <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 SingleQueryingEnumerable<T> : IEnumerable<T>, IAsyncEnumerable<T>, IRelationalQueryingEnumerable
{
private readonly RelationalQueryContext _relationalQueryContext;
private readonly RelationalCommandResolver _relationalCommandResolver;
private readonly IReadOnlyList<ReaderColumn?>? _readerColumns;
private readonly Func<QueryContext, DbDataReader, ResultContext, SingleQueryResultCoordinator, T> _shaper;
private readonly Type _contextType;
private readonly IDiagnosticsLogger<DbLoggerCategory.Query> _queryLogger;
private readonly bool _standAloneStateManager;
private readonly bool _detailedErrorsEnabled;
private readonly bool _threadSafetyChecksEnabled;
/// <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 SingleQueryingEnumerable(
RelationalQueryContext relationalQueryContext,
RelationalCommandResolver relationalCommandResolver,
IReadOnlyList<ReaderColumn?>? readerColumns,
Func<QueryContext, DbDataReader, ResultContext, SingleQueryResultCoordinator, T> shaper,
Type contextType,
bool standAloneStateManager,
bool detailedErrorsEnabled,
bool threadSafetyChecksEnabled)
{
_relationalQueryContext = relationalQueryContext;
_relationalCommandResolver = relationalCommandResolver;
_readerColumns = readerColumns;
_shaper = shaper;
_contextType = contextType;
_queryLogger = relationalQueryContext.QueryLogger;
_standAloneStateManager = standAloneStateManager;
_detailedErrorsEnabled = detailedErrorsEnabled;
_threadSafetyChecksEnabled = threadSafetyChecksEnabled;
}
/// <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 virtual IAsyncEnumerator<T> GetAsyncEnumerator(CancellationToken cancellationToken = default)
{
_relationalQueryContext.CancellationToken = cancellationToken;
return new AsyncEnumerator(this);
}
/// <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 virtual IEnumerator<T> GetEnumerator()
=> new Enumerator(this);
/// <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>
IEnumerator IEnumerable.GetEnumerator()
=> GetEnumerator();
/// <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 virtual DbCommand CreateDbCommand()
=> _relationalCommandResolver(_relationalQueryContext.ParameterValues)
.CreateDbCommand(
new RelationalCommandParameterObject(
_relationalQueryContext.Connection,
_relationalQueryContext.ParameterValues,
null,
null,
null, CommandSource.LinqQuery),
Guid.Empty,
(DbCommandMethod)(-1));
/// <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 virtual string ToQueryString()
{
using var dbCommand = CreateDbCommand();
return _relationalQueryContext.RelationalQueryStringFactory.Create(dbCommand);
}
private sealed class Enumerator : IEnumerator<T>
{
private readonly RelationalQueryContext _relationalQueryContext;
private readonly RelationalCommandResolver _relationalCommandResolver;
private readonly IReadOnlyList<ReaderColumn?>? _readerColumns;
private readonly Func<QueryContext, DbDataReader, ResultContext, SingleQueryResultCoordinator, T> _shaper;
private readonly Type _contextType;
private readonly IDiagnosticsLogger<DbLoggerCategory.Query> _queryLogger;
private readonly bool _standAloneStateManager;
private readonly bool _detailedErrorsEnabled;
private readonly IConcurrencyDetector? _concurrencyDetector;
private readonly IExceptionDetector _exceptionDetector;
private IRelationalCommand? _relationalCommand;
private RelationalDataReader? _dataReader;
private DbDataReader? _dbDataReader;
private SingleQueryResultCoordinator? _resultCoordinator;
public Enumerator(SingleQueryingEnumerable<T> queryingEnumerable)
{
_relationalQueryContext = queryingEnumerable._relationalQueryContext;
_relationalCommandResolver = queryingEnumerable._relationalCommandResolver;
_readerColumns = queryingEnumerable._readerColumns;
_shaper = queryingEnumerable._shaper;
_contextType = queryingEnumerable._contextType;
_queryLogger = queryingEnumerable._queryLogger;
_standAloneStateManager = queryingEnumerable._standAloneStateManager;
_detailedErrorsEnabled = queryingEnumerable._detailedErrorsEnabled;
_exceptionDetector = _relationalQueryContext.ExceptionDetector;
Current = default!;
_concurrencyDetector = queryingEnumerable._threadSafetyChecksEnabled
? _relationalQueryContext.ConcurrencyDetector
: null;
}
public T Current { get; private set; }
object IEnumerator.Current
=> Current!;
public bool MoveNext()
{
try
{
using var _ = _concurrencyDetector?.EnterCriticalSection();
if (_dataReader == null)
{
_relationalQueryContext.ExecutionStrategy.Execute(
this, static (_, enumerator) => InitializeReader(enumerator), null);
}
var hasNext = _resultCoordinator!.HasNext ?? _dataReader!.Read();
if (hasNext)
{
while (true)
{
_resultCoordinator.ResultReady = true;
_resultCoordinator.HasNext = null;
Current = _shaper(
_relationalQueryContext, _dbDataReader!, _resultCoordinator.ResultContext, _resultCoordinator);
if (_resultCoordinator.ResultReady)
{
// We generated a result so null out previously stored values
_resultCoordinator.ResultContext.Values = null;
break;
}
// If we are already pointing to next row, we don't need to call Read
if (_resultCoordinator.HasNext == true)
{
continue;
}
if (!_dataReader!.Read())
{
_resultCoordinator.HasNext = false;
// Enumeration has ended, materialize last element
_resultCoordinator.ResultReady = true;
Current = _shaper(
_relationalQueryContext, _dbDataReader!, _resultCoordinator.ResultContext, _resultCoordinator);
break;
}
}
}
else
{
Current = default!;
}
return hasNext;
}
catch (Exception exception)
{
if (_exceptionDetector.IsCancellation(exception))
{
_queryLogger.QueryCanceled(_contextType);
}
else
{
_queryLogger.QueryIterationFailed(_contextType, exception);
}
throw;
}
}
private static bool InitializeReader(Enumerator enumerator)
{
EntityFrameworkMetricsData.ReportQueryExecuting();
var relationalCommand = enumerator._relationalCommand =
enumerator._relationalCommandResolver.RentAndPopulateRelationalCommand(enumerator._relationalQueryContext);
var dataReader = enumerator._dataReader = relationalCommand.ExecuteReader(
new RelationalCommandParameterObject(
enumerator._relationalQueryContext.Connection,
enumerator._relationalQueryContext.ParameterValues,
enumerator._readerColumns,
enumerator._relationalQueryContext.Context,
enumerator._relationalQueryContext.CommandLogger,
enumerator._detailedErrorsEnabled,
CommandSource.LinqQuery));
enumerator._dbDataReader = dataReader.DbDataReader;
enumerator._resultCoordinator = new SingleQueryResultCoordinator();
enumerator._relationalQueryContext.InitializeStateManager(enumerator._standAloneStateManager);
return false;
}
public void Dispose()
{
if (_dataReader is not null)
{
_relationalQueryContext.Connection.ReturnCommand(_relationalCommand!);
_dataReader.Dispose();
_dataReader = null;
_dbDataReader = null;
}
}
public void Reset()
=> throw new NotSupportedException(CoreStrings.EnumerableResetNotSupported);
}
private sealed class AsyncEnumerator : IAsyncEnumerator<T>
{
private readonly RelationalQueryContext _relationalQueryContext;
private readonly RelationalCommandResolver _relationalCommandResolver;
private readonly IReadOnlyList<ReaderColumn?>? _readerColumns;
private readonly Func<QueryContext, DbDataReader, ResultContext, SingleQueryResultCoordinator, T> _shaper;
private readonly Type _contextType;
private readonly IDiagnosticsLogger<DbLoggerCategory.Query> _queryLogger;
private readonly bool _standAloneStateManager;
private readonly bool _detailedErrorsEnabled;
private readonly IConcurrencyDetector? _concurrencyDetector;
private readonly IExceptionDetector _exceptionDetector;
private readonly CancellationToken _cancellationToken;
private IRelationalCommand? _relationalCommand;
private RelationalDataReader? _dataReader;
private DbDataReader? _dbDataReader;
private SingleQueryResultCoordinator? _resultCoordinator;
public AsyncEnumerator(SingleQueryingEnumerable<T> queryingEnumerable)
{
_relationalQueryContext = queryingEnumerable._relationalQueryContext;
_relationalCommandResolver = queryingEnumerable._relationalCommandResolver;
_readerColumns = queryingEnumerable._readerColumns;
_shaper = queryingEnumerable._shaper;
_contextType = queryingEnumerable._contextType;
_queryLogger = queryingEnumerable._queryLogger;
_standAloneStateManager = queryingEnumerable._standAloneStateManager;
_detailedErrorsEnabled = queryingEnumerable._detailedErrorsEnabled;
_exceptionDetector = _relationalQueryContext.ExceptionDetector;
_cancellationToken = _relationalQueryContext.CancellationToken;
Current = default!;
_concurrencyDetector = queryingEnumerable._threadSafetyChecksEnabled
? _relationalQueryContext.ConcurrencyDetector
: null;
}
public T Current { get; private set; }
public async ValueTask<bool> MoveNextAsync()
{
try
{
using var _ = _concurrencyDetector?.EnterCriticalSection();
if (_dataReader == null)
{
await _relationalQueryContext.ExecutionStrategy.ExecuteAsync(
this,
static (_, enumerator, cancellationToken) => InitializeReaderAsync(enumerator, cancellationToken),
null,
_cancellationToken)
.ConfigureAwait(false);
}
var hasNext = _resultCoordinator!.HasNext
?? await _dataReader!.ReadAsync(_cancellationToken).ConfigureAwait(false);
if (hasNext)
{
while (true)
{
_resultCoordinator.ResultReady = true;
_resultCoordinator.HasNext = null;
Current = _shaper(
_relationalQueryContext, _dbDataReader!, _resultCoordinator.ResultContext, _resultCoordinator);
if (_resultCoordinator.ResultReady)
{
// We generated a result so null out previously stored values
_resultCoordinator.ResultContext.Values = null;
break;
}
// If we are already pointing to next row, we don't need to call Read
if (_resultCoordinator.HasNext == true)
{
continue;
}
if (!await _dataReader!.ReadAsync(_cancellationToken).ConfigureAwait(false))
{
_resultCoordinator.HasNext = false;
// Enumeration has ended, materialize last element
_resultCoordinator.ResultReady = true;
Current = _shaper(
_relationalQueryContext, _dbDataReader!, _resultCoordinator.ResultContext, _resultCoordinator);
break;
}
}
}
else
{
Current = default!;
}
return hasNext;
}
catch (Exception exception)
{
if (_exceptionDetector.IsCancellation(exception, _cancellationToken))
{
_queryLogger.QueryCanceled(_contextType);
}
else
{
_queryLogger.QueryIterationFailed(_contextType, exception);
}
throw;
}
}
private static async Task<bool> InitializeReaderAsync(AsyncEnumerator enumerator, CancellationToken cancellationToken)
{
EntityFrameworkMetricsData.ReportQueryExecuting();
var relationalCommand = enumerator._relationalCommand =
enumerator._relationalCommandResolver.RentAndPopulateRelationalCommand(enumerator._relationalQueryContext);
var dataReader = enumerator._dataReader = await relationalCommand.ExecuteReaderAsync(
new RelationalCommandParameterObject(
enumerator._relationalQueryContext.Connection,
enumerator._relationalQueryContext.ParameterValues,
enumerator._readerColumns,
enumerator._relationalQueryContext.Context,
enumerator._relationalQueryContext.CommandLogger,
enumerator._detailedErrorsEnabled, CommandSource.LinqQuery),
cancellationToken)
.ConfigureAwait(false);
enumerator._dbDataReader = dataReader.DbDataReader;
enumerator._resultCoordinator = new SingleQueryResultCoordinator();
enumerator._relationalQueryContext.InitializeStateManager(enumerator._standAloneStateManager);
return false;
}
public ValueTask DisposeAsync()
{
if (_dataReader is not null)
{
_relationalQueryContext.Connection.ReturnCommand(_relationalCommand!);
var dataReader = _dataReader;
_dataReader = null;
_dbDataReader = null;
return dataReader.DisposeAsync();
}
return default;
}
}
}