private void FlushBufferedRecords(ReadsForPosition reads)
{
foreach (byte[] buffer in reads.Reads)
{
_bamWriter.WriteAlignment(buffer);
}
}
/// <summary>
/// We're finished processing a read. Add it to the read buffer, and flush
/// old nodes to disk.
/// </summary>
public void WriteRead(ref BamAlignment read, bool remapped)
{
if (remapped)
{
var info = new RemapInfo(read.Position,
read.Position + (int)read.CigarData.GetReferenceSpan() - 1);
_remappings[string.Format("{0}-{1}", read.Name, read.IsFirstMate() ? 1 : 2)] = info;
}
LinkedListNode <ReadsForPosition> node = _readBuffer.First;
LinkedListNode <ReadsForPosition> nextNode;
byte[] buffer = BamWriter.SerializeAlignment(ref read);
while (node != null)
{
// Flush reads that are earlier than the earliest possible read we could see in the future (i.e. 2x max shift less than current read).
// Reasoning: The realign shift could go in two directions. So, for example with max shift of 10, you could receive
// and buffer reads in an order like this: 100, 100, 110, 115 (originally 110, shifted right to 115),
// 100 (originally 110, shifted left to 100), 120 (originally 110, shifted right to 120),
// 101 (originally 110, shifted left to 100), 121, 130, etc. If you had been flushing reads
// using the max shift only as the threshold, upon hitting the 115 (fourth read) you would have
// flushed the 100s (because 100 < 115 - 10), even though there still may be 100s coming through.
// By the time we hit 121, we know that all of the reads we encounter in the future are going to be > 100 (at minimum, the 121 could represent a max-right-shift from 111 and other 111 reads could be max-left-shifted to 101).
if (node.Value.Position < read.Position - (_maxRealignShift * 2))
{
MinimumRealignmentStartPosition = Math.Max(MinimumRealignmentStartPosition, node.Value.Position);
nextNode = node.Next;
FlushBufferedRecords(node.Value);
_readBuffer.Remove(node);
node = nextNode;
continue;
}
if (node.Value.Position == read.Position)
{
node.Value.Reads.Add(buffer);
return;
}
if (node.Value.Position > read.Position)
{
ReadsForPosition reads = new ReadsForPosition();
reads.Position = read.Position;
reads.Reads.Add(buffer);
_readBuffer.AddBefore(node, reads);
return;
}
node = node.Next;
}
ReadsForPosition readList = new ReadsForPosition();
readList.Position = read.Position;
readList.Reads.Add(buffer);
_readBuffer.AddLast(readList);
}