public async Task Save(RecordRefRun run, string targetFileName, bool returnBuffer = true)
{
using var output = new FileStream(
path: targetFileName,
FileMode.CreateNew,
FileAccess.Write,
FileShare.None,
bufferSize: 1024 * (int)Units.BytesPerKiB);
const int capacity = 900 * 1000;
ValueTask writeTask = ValueTask.CompletedTask;
var buffer1 = new ArrayBufferWriter <byte>(capacity);
var buffer2 = new ArrayBufferWriter <byte>(capacity);
var buffer = buffer1;
foreach (var item in run.Records)
{
if (buffer.FreeCapacity < item.length)
{
await writeTask;
writeTask = output.WriteAsync(buffer.WrittenMemory);
buffer = buffer == buffer1 ? buffer2 : buffer1;
buffer.Clear();
}
buffer.Write(run.Buffer.AsSpan().Slice(item.offset, item.length));
}
await writeTask;
await output.WriteAsync(buffer.WrittenMemory);
if (returnBuffer)
{
ReturnBuffer(run.Buffer);
}
}
public void Sort(RecordRefRun run)
{
var comparer = new RecordRefComparer(run.Buffer, run.Limit);
run.Records.Sort(comparer.Compare);
}