public void DeleteRevision(DocumentsOperationContext context, Slice key, string collection, string changeVector, long lastModifiedTicks)
{
var collectionName = new CollectionName(collection);
var table = EnsureRevisionTableCreated(context.Transaction.InnerTransaction, collectionName);
long revisionEtag;
if (table.ReadByKey(key, out TableValueReader tvr))
{
using (TableValueToSlice(context, (int)RevisionsTable.LowerId, ref tvr, out Slice lowerId))
using (GetKeyPrefix(context, lowerId, out Slice prefixSlice))
{
IncrementCountOfRevisions(context, prefixSlice, -1);
}
revisionEtag = TableValueToEtag((int)RevisionsTable.Etag, ref tvr);
table.Delete(tvr.Id);
}
else
{
var tombstoneTable = context.Transaction.InnerTransaction.OpenTable(TombstonesSchema, RevisionsTombstonesSlice);
if (tombstoneTable.ReadByKey(key, out var existingTombstone))
{
revisionEtag = TableValueToEtag((int)TombstoneTable.Etag, ref existingTombstone);
tombstoneTable.Delete(existingTombstone.Id);
}
else
{
// we need to generate a unique etag if we got a tombstone revisions from replication,
// but we don't want to mess up the order of events so the delete revision etag we use is negative
revisionEtag = _documentsStorage.GenerateNextEtagForReplicatedTombstoneMissingDocument(context);
}
}
CreateTombstone(context, key, revisionEtag, collectionName, changeVector, lastModifiedTicks);
}
