protected override async Task DeleteAsync(string persistenceId, SnapshotSelectionCriteria criteria)
{
var filter = RowFilters.Chain
(
RowFilters.ColumnQualifierExact(SnapshotMetaDataColumnQualifier),
// this filter ensures that we only download snapshot metadata
RowFilters.TimestampRange(
ToUtc(criteria.MinTimestamp),
ToUtc(criteria.MaxTimeStamp)?.AddMilliseconds(1)
// add a milliseconds since the upper bound is exclusive
),
RowFilters.CellsPerColumnLimit(1)
);
var readRowsRequest = new ReadRowsRequest
{
TableNameAsTableName = _tableName,
Filter = filter,
Rows = GetRowSet(persistenceId, criteria.MinSequenceNr, criteria.MaxSequenceNr)
};
var deleteMutations = await _bigtableClient
.ReadRows(readRowsRequest)
.Select(SnapshotMetadataFromBigtableRow)
.Where(metadata => SatisfiesTimestampCriteria(criteria, metadata))
.Select(metadata => Mutations.CreateEntry(GetRowKey(persistenceId, metadata.SequenceNr), Mutations.DeleteFromRow()))
.ToList()
.ConfigureAwait(false);
if (deleteMutations.Count > 0)
{
await _bigtableClient.MutateRowsAsync(_tableName, deleteMutations).ConfigureAwait(false);
}
}
protected override async Task DeleteMessagesToAsync(string persistenceId, long toSequenceNr)
{
var rows = RowSet.FromRowRanges(RowRange.Closed(ToRowKeyBigtableByteString(persistenceId, 0), ToRowKeyBigtableByteString(persistenceId, toSequenceNr)));
var stream = _bigtableClient.ReadRows(_tableName, rows: rows);
var deleteEntries = new List <MutateRowsRequest.Types.Entry>();
using (var enumerator = stream.GetEnumerator())
{
while (await enumerator.MoveNext().ConfigureAwait(false))
{
deleteEntries.Add(Mutations.CreateEntry(enumerator.Current.Key, Mutations.DeleteFromRow()));
}
}
if (deleteEntries.Any())
{
var last = deleteEntries.LastOrDefault();
deleteEntries.RemoveAt(deleteEntries.Count - 1);
deleteEntries.Add(Mutations.CreateEntry(last.RowKey, Mutations.SetCell(_family, PayloadColumnQualifier, ByteString.Empty, new BigtableVersion(-1))));
await _bigtableClient.MutateRowsAsync(_tableName, deleteEntries);
}
}