private readonly IComparer <TKey> _keyComparer; // Comparer for the order keys
//---------------------------------------------------------------------------------------
// Instantiates a new enumerator.
//
internal LastQueryOperatorEnumerator(
QueryOperatorEnumerator <TSource, TKey> source, Func <TSource, bool>?predicate,
LastQueryOperatorState <TKey> operatorState, CountdownEvent sharedBarrier, CancellationToken cancelToken,
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 = cancelToken;
_keyComparer = keyComparer;
_partitionId = partitionId;
}
private void WrapHelper <TKey>(PartitionedStream <TSource, TKey> inputStream, IPartitionedStreamRecipient <TSource> recipient, QuerySettings settings)
{
int partitionCount = inputStream.PartitionCount;
// Generate the shared data.
LastQueryOperatorState <TKey> operatorState = new LastQueryOperatorState <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 LastQueryOperatorEnumerator <TKey>(
inputStream[i], _predicate, operatorState, sharedBarrier, settings.CancellationState.MergedCancellationToken,
inputStream.KeyComparer, i);
}
recipient.Receive(outputStream);
}
