//---------------------------------------------------------------------------------------
// Executes the query and returns the results in an array.
//
internal TOutput[] ExecuteAndGetResultsAsArray()
{
QuerySettings querySettings =
SpecifiedQuerySettings
.WithPerExecutionSettings()
.WithDefaults();
QueryLifecycle.LogicalQueryExecutionBegin(querySettings.QueryId);
try
{
Debug.Assert(querySettings.ExecutionMode != null);
if (querySettings.ExecutionMode.Value == ParallelExecutionMode.Default && LimitsParallelism)
{
IEnumerable <TOutput> opSequential = AsSequentialQuery(querySettings.CancellationState.ExternalCancellationToken);
IEnumerable <TOutput> opSequentialWithCancelChecks = CancellableEnumerable.Wrap(opSequential, querySettings.CancellationState.ExternalCancellationToken);
return(ExceptionAggregator.WrapEnumerable(opSequentialWithCancelChecks, querySettings.CancellationState).ToArray());
}
QueryResults <TOutput> results = GetQueryResults(querySettings);
// Top-level preemptive cancellation test.
// This handles situations where cancellation has occurred before execution commences
// The handling for in-execution occurs in QueryTaskGroupState.QueryEnd()
if (querySettings.CancellationState.MergedCancellationToken.IsCancellationRequested)
{
querySettings.CancellationState.ExternalCancellationToken.ThrowIfCancellationRequested();
throw new OperationCanceledException();
}
if (results.IsIndexible && OutputOrdered)
{
// The special array-based merge performs better if the output is ordered, because
// it does not have to pay for ordering. In the unordered case, we it appears that
// the stop-and-go merge performs a little better.
ArrayMergeHelper <TOutput> merger = new ArrayMergeHelper <TOutput>(SpecifiedQuerySettings, results);
merger.Execute();
TOutput[] output = merger.GetResultsAsArray();
querySettings.CleanStateAtQueryEnd();
return(output);
}
else
{
Debug.Assert(querySettings.TaskScheduler != null);
PartitionedStreamMerger <TOutput> merger =
new PartitionedStreamMerger <TOutput>(false, ParallelMergeOptions.FullyBuffered, querySettings.TaskScheduler,
OutputOrdered, querySettings.CancellationState, querySettings.QueryId);
results.GivePartitionedStream(merger);
Debug.Assert(merger.MergeExecutor != null);
TOutput[]? output = merger.MergeExecutor.GetResultsAsArray();
querySettings.CleanStateAtQueryEnd();
Debug.Assert(output != null);
return(output);
}
}
finally
{
QueryLifecycle.LogicalQueryExecutionEnd(querySettings.QueryId);
}
}
internal IEnumerator <TOutput> GetOpenedEnumerator(ParallelMergeOptions?mergeOptions, bool suppressOrder, bool forEffect, QuerySettings querySettings)
{
if ((((ParallelExecutionMode)querySettings.ExecutionMode.Value) == ParallelExecutionMode.Default) && this.LimitsParallelism)
{
return(ExceptionAggregator.WrapEnumerable <TOutput>(this.AsSequentialQuery(querySettings.CancellationState.ExternalCancellationToken), querySettings.CancellationState).GetEnumerator());
}
QueryResults <TOutput> queryResults = this.GetQueryResults(querySettings);
if (!mergeOptions.HasValue)
{
mergeOptions = querySettings.MergeOptions;
}
if (querySettings.CancellationState.MergedCancellationToken.IsCancellationRequested)
{
if (querySettings.CancellationState.ExternalCancellationToken.IsCancellationRequested)
{
throw new OperationCanceledException(querySettings.CancellationState.ExternalCancellationToken);
}
throw new OperationCanceledException();
}
bool outputOrdered = this.OutputOrdered && !suppressOrder;
PartitionedStreamMerger <TOutput> recipient = new PartitionedStreamMerger <TOutput>(forEffect, mergeOptions.GetValueOrDefault(), querySettings.TaskScheduler, outputOrdered, querySettings.CancellationState, querySettings.QueryId);
queryResults.GivePartitionedStream(recipient);
if (forEffect)
{
return(null);
}
return(recipient.MergeExecutor.GetEnumerator());
}
internal TOutput[] ExecuteAndGetResultsAsArray()
{
TOutput[] localArray3;
QuerySettings querySettings = base.SpecifiedQuerySettings.WithPerExecutionSettings().WithDefaults();
QueryLifecycle.LogicalQueryExecutionBegin(querySettings.QueryId);
try
{
if ((((ParallelExecutionMode)querySettings.ExecutionMode.Value) == ParallelExecutionMode.Default) && this.LimitsParallelism)
{
IEnumerable <TOutput> source = this.AsSequentialQuery(querySettings.CancellationState.ExternalCancellationToken);
IEnumerable <TOutput> introduced13 = CancellableEnumerable.Wrap <TOutput>(source, querySettings.CancellationState.ExternalCancellationToken);
return(ExceptionAggregator.WrapEnumerable <TOutput>(introduced13, querySettings.CancellationState).ToArray <TOutput>());
}
QueryResults <TOutput> queryResults = this.GetQueryResults(querySettings);
if (queryResults.IsIndexible && this.OutputOrdered)
{
ArrayMergeHelper <TOutput> helper = new ArrayMergeHelper <TOutput>(base.SpecifiedQuerySettings, queryResults);
helper.Execute();
TOutput[] localArray = helper.GetResultsAsArray();
querySettings.CleanStateAtQueryEnd();
return(localArray);
}
PartitionedStreamMerger <TOutput> recipient = new PartitionedStreamMerger <TOutput>(false, ParallelMergeOptions.FullyBuffered, querySettings.TaskScheduler, this.OutputOrdered, querySettings.CancellationState, querySettings.QueryId);
queryResults.GivePartitionedStream(recipient);
TOutput[] resultsAsArray = recipient.MergeExecutor.GetResultsAsArray();
querySettings.CleanStateAtQueryEnd();
localArray3 = resultsAsArray;
}
finally
{
QueryLifecycle.LogicalQueryExecutionEnd(querySettings.QueryId);
}
return(localArray3);
}
internal bool Aggregate(out TSource result, bool withDefaultValue)
{
if (this.LimitsParallelism && (((ParallelExecutionMode)base.SpecifiedQuerySettings.WithDefaults().ExecutionMode.Value) != ParallelExecutionMode.ForceParallelism))
{
CancellationState cancellationState = base.SpecifiedQuerySettings.CancellationState;
if (withDefaultValue)
{
IEnumerable <TSource> source = CancellableEnumerable.Wrap <TSource>(base.Child.AsSequentialQuery(cancellationState.ExternalCancellationToken), cancellationState.ExternalCancellationToken);
result = ExceptionAggregator.WrapEnumerable <TSource>(source, cancellationState).ElementAtOrDefault <TSource>(this.m_index);
}
else
{
IEnumerable <TSource> enumerable4 = CancellableEnumerable.Wrap <TSource>(base.Child.AsSequentialQuery(cancellationState.ExternalCancellationToken), cancellationState.ExternalCancellationToken);
result = ExceptionAggregator.WrapEnumerable <TSource>(enumerable4, cancellationState).ElementAt <TSource>(this.m_index);
}
return(true);
}
using (IEnumerator <TSource> enumerator = base.GetEnumerator(3))
{
if (enumerator.MoveNext())
{
TSource current = enumerator.Current;
result = current;
return(true);
}
}
result = default(TSource);
return(false);
}
//---------------------------------------------------------------------------------------
// The GetOpenedEnumerator method return an enumerator that walks the contents of a query.
// The enumerator will be "opened", which means that PLINQ will start executing the query
// immediately, even before the user calls MoveNext() for the first time.
//
internal IEnumerator <TOutput> GetOpenedEnumerator(ParallelMergeOptions?mergeOptions, bool suppressOrder, bool forEffect,
QuerySettings querySettings)
{
// If the top-level enumerator forces a premature merge, run the query sequentially.
if (querySettings.ExecutionMode.Value == ParallelExecutionMode.Default && LimitsParallelism)
{
IEnumerable <TOutput> opSequential = AsSequentialQuery(querySettings.CancellationState.ExternalCancellationToken);
return(ExceptionAggregator.WrapEnumerable(opSequential, querySettings.CancellationState).GetEnumerator());
}
QueryResults <TOutput> queryResults = GetQueryResults(querySettings);
if (mergeOptions == null)
{
mergeOptions = querySettings.MergeOptions;
}
Contract.Assert(mergeOptions != null);
// Top-level pre-emptive cancellation test.
// This handles situations where cancellation has occured before execution commences
// The handling for in-execution occurs in QueryTaskGroupState.QueryEnd()
if (querySettings.CancellationState.MergedCancellationToken.IsCancellationRequested)
{
if (querySettings.CancellationState.ExternalCancellationToken.IsCancellationRequested)
{
#if PFX_LEGACY_3_5
throw new OperationCanceledException2(querySettings.CancellationState.ExternalCancellationToken);
#else
throw new OperationCanceledException(querySettings.CancellationState.ExternalCancellationToken);
#endif
}
else
{
throw new OperationCanceledException();
}
}
bool orderedMerge = OutputOrdered && !suppressOrder;
PartitionedStreamMerger <TOutput> merger = new PartitionedStreamMerger <TOutput>(forEffect, mergeOptions.GetValueOrDefault(),
querySettings.TaskScheduler,
orderedMerge,
querySettings.CancellationState,
querySettings.QueryId);
queryResults.GivePartitionedStream(merger); // hook up the data flow between the operator-executors, starting from the merger.
if (forEffect)
{
return(null);
}
return(merger.MergeExecutor.GetEnumerator());
}
//---------------------------------------------------------------------------------------
// Executes the query and returns the results in an array.
//
internal TOutput[] ExecuteAndGetResultsAsArray()
{
QuerySettings querySettings =
SpecifiedQuerySettings
.WithPerExecutionSettings()
.WithDefaults();
QueryLifecycle.LogicalQueryExecutionBegin(querySettings.QueryId);
try
{
if (querySettings.ExecutionMode.Value == ParallelExecutionMode.Default && LimitsParallelism)
{
IEnumerable <TOutput> opSequential = AsSequentialQuery(querySettings.CancellationState.ExternalCancellationToken);
IEnumerable <TOutput> opSequentialWithCancelChecks = CancellableEnumerable.Wrap(opSequential, querySettings.CancellationState.ExternalCancellationToken);
return(ExceptionAggregator.WrapEnumerable(opSequentialWithCancelChecks, querySettings.CancellationState).ToArray());
}
QueryResults <TOutput> results = GetQueryResults(querySettings);
if (results.IsIndexible && OutputOrdered)
{
// The special array-based merge performs better if the output is ordered, because
// it does not have to pay for ordering. In the unordered case, we it appears that
// the stop-and-go merge performs a little better.
ArrayMergeHelper <TOutput> merger = new ArrayMergeHelper <TOutput>(SpecifiedQuerySettings, results);
merger.Execute();
TOutput[] output = merger.GetResultsAsArray();
querySettings.CleanStateAtQueryEnd();
return(output);
}
else
{
PartitionedStreamMerger <TOutput> merger =
new PartitionedStreamMerger <TOutput>(false, ParallelMergeOptions.FullyBuffered, querySettings.TaskScheduler,
OutputOrdered, querySettings.CancellationState, querySettings.QueryId);
results.GivePartitionedStream(merger);
TOutput[] output = merger.MergeExecutor.GetResultsAsArray();
querySettings.CleanStateAtQueryEnd();
return(output);
}
}
finally
{
QueryLifecycle.LogicalQueryExecutionEnd(querySettings.QueryId);
}
}
/// <summary>
/// Executes the query, either sequentially or in parallel, depending on the query execution mode and
/// whether a premature merge was inserted by this ElementAt operator.
/// </summary>
/// <param name="result">result</param>
/// <param name="withDefaultValue">withDefaultValue</param>
/// <returns>whether an element with this index exists</returns>
internal bool Aggregate(out TSource result, bool withDefaultValue)
{
// If we were to insert a premature merge before this ElementAt, and we are executing in conservative mode, run the whole query
// sequentially.
if (LimitsParallelism && SpecifiedQuerySettings.WithDefaults().ExecutionMode.Value != ParallelExecutionMode.ForceParallelism)
{
CancellationState cancelState = SpecifiedQuerySettings.CancellationState;
if (withDefaultValue)
{
IEnumerable <TSource> childAsSequential = Child.AsSequentialQuery(cancelState.ExternalCancellationToken);
IEnumerable <TSource> childWithCancelChecks = CancellableEnumerable.Wrap(childAsSequential, cancelState.ExternalCancellationToken);
result = ExceptionAggregator.WrapEnumerable(childWithCancelChecks, cancelState).ElementAtOrDefault(_index);
}
else
{
IEnumerable <TSource> childAsSequential = Child.AsSequentialQuery(cancelState.ExternalCancellationToken);
IEnumerable <TSource> childWithCancelChecks = CancellableEnumerable.Wrap(childAsSequential, cancelState.ExternalCancellationToken);
result = ExceptionAggregator.WrapEnumerable(childWithCancelChecks, cancelState).ElementAt(_index);
}
return(true);
}
using (IEnumerator <TSource> e = GetEnumerator(ParallelMergeOptions.FullyBuffered))
{
if (e.MoveNext())
{
TSource current = e.Current;
Contract.Assert(!e.MoveNext(), "expected enumerator to be empty");
result = current;
return(true);
}
}
result = default(TSource);
return(false);
}