private void WrapHelper <TKey>(
PartitionedStream <TSource, TKey> inputStream, IPartitionedStreamRecipient <TSource> recipient, QuerySettings settings)
{
int partitionCount = inputStream.PartitionCount;
if (ParallelEnumerable.SinglePartitionMode)
{
Debug.Assert(partitionCount == 1);
}
// Generate the shared data.
FirstQueryOperatorState <TKey> operatorState = new FirstQueryOperatorState <TKey>();
CountdownEvent sharedBarrier = new CountdownEvent(partitionCount);
PartitionedStream <TSource, int> outputStream = new PartitionedStream <TSource, int>(
partitionCount, Util.GetDefaultComparer <int>(), OrdinalIndexState.Shuffled);
for (int i = 0; i < partitionCount; i++)
{
outputStream[i] = new FirstQueryOperatorEnumerator <TKey>(
inputStream[i], _predicate, operatorState, sharedBarrier,
settings.CancellationState.MergedCancellationToken, inputStream.KeyComparer, i);
}
recipient.Receive(outputStream);
}
private readonly IComparer <TKey> _keyComparer; // Comparer for the order keys
//---------------------------------------------------------------------------------------
// Instantiates a new enumerator.
//
internal FirstQueryOperatorEnumerator(
QueryOperatorEnumerator <TSource, TKey> source, Func <TSource, bool>?predicate,
FirstQueryOperatorState <TKey> operatorState, CountdownEvent sharedBarrier, CancellationToken cancellationToken,
IComparer <TKey> keyComparer, int partitionId)
{
Debug.Assert(source != null);
Debug.Assert(operatorState != null);
Debug.Assert(sharedBarrier != null);
Debug.Assert(keyComparer != null);
_source = source;
_predicate = predicate;
_operatorState = operatorState;
_sharedBarrier = sharedBarrier;
_cancellationToken = cancellationToken;
_keyComparer = keyComparer;
_partitionId = partitionId;
}