// methods
private Task <CursorBatch <TDocument> > ExecuteProtocolAsync(IChannelHandle channel, BsonDocument wrappedQuery, bool slaveOk, CancellationToken cancellationToken)
{
var firstBatchSize = QueryHelper.CalculateFirstBatchSize(_limit, _batchSize);
return(channel.QueryAsync <TDocument>(
_collectionNamespace,
wrappedQuery,
_projection,
NoOpElementNameValidator.Instance,
_skip ?? 0,
firstBatchSize,
slaveOk,
_allowPartialResults,
_noCursorTimeout,
_cursorType != CursorType.NonTailable, // tailable
_cursorType == CursorType.TailableAwait, //await data
_resultSerializer,
_messageEncoderSettings,
cancellationToken));
}