private async Task <IReadOnlyList <TargetDirectory> > ProcessFilesAsync(IReadOnlyList <FileRecord> records,
CancellationToken cancellationToken)
{
var outputs = new Dictionary <string, TargetDirectory>();
foreach (var record in records)
{
var key = record.GetTargetKey();
if (!outputs.TryGetValue(key, out var targetDirectory))
{
targetDirectory = await TargetDirectory.FromRecordAsync(_directories, record);
outputs[key] = targetDirectory;
}
else
{
targetDirectory.SourceRecords.Add(record);
}
}
return(outputs.Values.ToArray());
}