public ulong DeleteNodes(ulong root, IDbShrinkRepository _repo)
{
if (_repo.NodeIdExists(root) || root == 0)
{
return(0);
}
var node = TryGetNodeById(root, _repo);
if (node is null)
{
return(0);
}
ulong nodesDeleted = 0;
foreach (var childId in node.Children)
{
if (childId != 0)
{
nodesDeleted += DeleteNodes(childId, _repo);
}
}
DeleteNode(root, node, _repo);
return(nodesDeleted + 1);
}
public ulong DeleteNodeId(ulong root, IDbShrinkRepository _repo)
{
if (!_repo.NodeIdExists(root) || root == 0)
{
return(0);
}
var node = TryGetNodeById(root, _repo);
if (node is null)
{
throw new Exception($"Corrupted trie: found null node for nodeId {root}");
}
ulong nodeIdDeleted = 0;
foreach (var childId in node.Children)
{
if (childId != 0)
{
nodeIdDeleted += DeleteNodeId(childId, _repo);
}
}
_repo.DeleteNodeId(root);
return(nodeIdDeleted + 1);
}
public DbShrink(ISnapshotIndexRepository snapshotIndexRepository, IDbShrinkRepository repository)
{
_snapshotIndexRepository = snapshotIndexRepository;
_repository = repository;
dbShrinkStatus = GetDbShrinkStatus();
dbShrinkDepth = GetDbShrinkDepth();
oldestSnapshot = GetOldestSnapshotInDb();
}
// These methods are used for DbCompact only
private IHashTrieNode?TryGetNodeById(ulong id, IDbShrinkRepository _repo)
{
if (id == 0)
{
return(null);
}
var _node = _lruCache.Get(id);
if (_node == null)
{
_node = _repo.GetNodeById(id);
if (_node != null)
{
_lruCache.Add(id, _node);
}
}
return(_node);
}
public ulong SaveNodeId(IDbShrinkRepository _repo)
{
return(_state.SaveNodeId(_repo));
}
public ulong DeleteSnapshot(IDbShrinkRepository _repo)
{
return(_state.DeleteNodes(_repo));
}
public ulong DeleteNodeId(IDbShrinkRepository _repo)
{
return(_state.DeleteNodeId(_repo));
}
public ulong DeleteNodes(IDbShrinkRepository _repo)
{
return(_trieMap.DeleteNodes(CurrentVersion, _repo));
}
public ulong SaveNodeId(IDbShrinkRepository _repo)
{
return(_trieMap.SaveNodeId(CurrentVersion, _repo));
}
private void DeleteNode(ulong id, IHashTrieNode node, IDbShrinkRepository _repo)
{
_lruCache.Remove(id);
_repo.DeleteNode(id, node);
}
