private async Task <CollectionPrepareResult> CheckFullCollectionTransitAsync(ITextStatusNotifier progress, CancellationToken token)
{
_logger.Debug("Detected full transit for collection {Collection}", _collectionName);
progress.Status = "Removing documents from destination...";
await _destination.DeleteAllDocumentsAsync(token);
progress.Status = "Counting documents...";
var count = await _source.CountAllAsync(token);
return(new CollectionPrepareResult(SourceFilter.Empty, count));
}
private async Task <CollectionPrepareResult> CheckIterativeCollectionAsync(ITextStatusNotifier progress, IterativeTransitOptions iterOpts, CancellationToken token)
{
_logger.Debug("Detected iterative transit for collection {Collection} with checkpoint field {Field}",
_collectionName, iterOpts.Field);
progress.Status = "Searching checkpoint...";
var filter = await CreateIterativeFilterAsync(iterOpts, token);
_logger.Debug("Counting how many documents should be transferred");
progress.Status = "Counting documents...";
var count = await _source.CountLagAsync(filter, token);
_logger.Debug("Collection {Collection} has lag {Lag:N0}", _collectionName, count);
return(new CollectionPrepareResult(filter, count));
}
public async Task <CollectionPrepareResult> PrepareCollectionAsync(
IterativeTransitOptions?iterativeTransitOptions,
ITextStatusNotifier progress,
CancellationToken token)
{
var sw = new Stopwatch();
sw.Start();
var result = iterativeTransitOptions != null
? await CheckIterativeCollectionAsync(progress, iterativeTransitOptions, token)
: await CheckFullCollectionTransitAsync(progress, token);
sw.Stop();
_logger.Debug("Collection check was completed in {Elapsed} ms", sw.ElapsedMilliseconds);
return(result);
}
