private void Init()
{
System.Threading.Tasks.Task.Factory.StartNew(() =>
{
while (true)
{
lock (this)
{
Current_Time = DateTime.Now;
System.Threading.Monitor.Wait(this, 100);
}
}
});
try
{
var buffer = new byte[512];
Metadata_Stream.Seek(0, SeekOrigin.Begin);
Metadata_Stream.Read(buffer, 0, buffer.Length);
var metadata = Metadata.From_Bytes(buffer);
Root = Read_Root(metadata.Root_Address);
if (Root.IsValid)
{
Order = metadata.Order;
_data_Pointer = metadata.DataStream_Length;
_index_Pointer = metadata.IndexStream_Length;
Cluster_Data_Length = metadata.Clustered_Data_Length;
Alignment = metadata.Alignment;
_node_Factory = new Node_Factory <T>(_key_Serializer, Order, Alignment, Cluster_Data_Length);
_block_Size = _node_Factory.Size_In_Bytes(Order);
_data_Serializer = new Data_Serializer <T>(_key_Serializer, Alignment, 2, 1024);
_pending_Changes = new Pending_Changes <T>(_block_Size, _index_Pointer, _data_Pointer, _node_Factory, _data_Serializer);
_metadata = metadata;
return;
}
}
catch (Exception) { }
var root = _node_Factory.Create_New(true);
Write_Node(root);
_pending_Changes.Append_New_Root(root);
}
public void Commit()
{
if (!_pending_Changes.Has_Pending_Changes())
{
return;
}
foreach (var address in _pending_Changes.Get_Freed_Empty_Slots())
{
_cache.Invalidate(address);
}
var newRoot = _pending_Changes.Commit(Index_Stream, Data_Stream);
writes++;
Metadata_Stream.Seek(0, SeekOrigin.Begin);
var buffer = new byte[512];
_metadata.DataStream_Length = _pending_Changes.Get_Current_Data_Pointer();
_metadata.IndexStream_Length = _pending_Changes.Get_Index_Pointer();
_metadata.Root_Address = newRoot.Address;
_metadata.Clustered_Data_Length = Cluster_Data_Length;
_metadata.Alignment = Alignment;
_metadata.Number_Of_Keys += key_added;
_metadata.Number_Of_Leaves += leaves_added;
_metadata.Number_Of_Nodes += nodes_added;
_metadata.Height = 0;
_metadata.To_Bytes_In_Buffer(buffer, 0);
Metadata_Stream.Write(buffer, 0, buffer.Length);
Metadata_Stream.Flush();
Root = newRoot;
_pending_Changes.Clean_Root();
key_added = leaves_added = nodes_added = 0;
// TODO persist empty pages on metadata ?
//Cached_Nodes.Clear();
//foreach (var node in Pending_Changes.Last_Cached_Nodes())
// Cached_Nodes[node.Address] = node;
_index_Pointer = _pending_Changes.Get_Index_Pointer();
Index_Stream.Flush();
}
public void Dispose()
{
Index_Stream.Dispose();
Metadata_Stream.Dispose();
Data_Stream.Dispose();
}
