internal override IList <IEnumerable <T> > GetEnumerables(QueryOptions options)
{
if (customPartitioner != null)
{
return(WrapHelper.Wrap(customPartitioner.GetPartitions(options.PartitionCount)));
}
Partitioner <T> partitioner
= (options.UseStrip) ? ParallelPartitioner.CreateForStrips(source, 1) : ParallelPartitioner.CreateBest(source);
return(WrapHelper.Wrap(partitioner.GetPartitions(options.PartitionCount)));
}
internal override IList <IEnumerable <KeyValuePair <long, T> > > GetOrderedEnumerables(QueryOptions options)
{
OrderablePartitioner <T> partitioner = null;
if (customPartitioner != null)
{
partitioner = customPartitioner as OrderablePartitioner <T>;
if (partitioner == null)
{
throw new InvalidOperationException("The partitionner you are using doesn't support ordered partitionning");
}
}
else
{
partitioner =
(options.UseStrip) ? ParallelPartitioner.CreateForStrips(source, 1) : ParallelPartitioner.CreateBest(source);
}
options.PartitionerSettings = Tuple.Create(partitioner.KeysOrderedAcrossPartitions,
partitioner.KeysOrderedInEachPartition,
partitioner.KeysNormalized);
// We only support one style of partitioning at the moment.
// Standard partitioners follow this style.
if (options.UseStrip && (!partitioner.KeysOrderedInEachPartition || partitioner.KeysOrderedAcrossPartitions))
{
throw new NotImplementedException("Partitioner must have KeysOrderedInEachPartition "
+ "and !KeysOrderedAcrossPartitions"
+ "to be used with indexed operators");
}
return(WrapHelper.Wrap(partitioner.GetOrderablePartitions(options.PartitionCount)));
}