public BPlusTree(Configuration <T> cfg)
{
Order = cfg.BPTree_Order;
Alignment = cfg.Alignment;
Cluster_Data_Length = cfg.Clustering_Data_Length;
_key_Serializer = cfg.Key_Serializer;
_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);
_streamFactory = cfg.Stream_Factory;
Index_Stream = _streamFactory.Create_ReadWrite_Index_Stream();
Data_Stream = _streamFactory.Create_ReadWrite_Data_Stream();
Metadata_Stream = _streamFactory.Create_ReadWrite_Metadata_Stream();
Cached_Nodes = new Dictionary <long, Node <T> >();
_cache = new Cache_LRU <long, Node <T> >(() => this.Current_Time);
_metadata = new Metadata {
Order = Order
};
Init();
}
public BPlusTree(Stream metadataStream, Stream indexStream, Stream dataStream, int order, int alignment, int cluster_data_length, IKey_Serializer <T> serializer)
{
Order = order;
Alignment = alignment;
Cluster_Data_Length = cluster_data_length;
_key_Serializer = serializer;
_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);
Index_Stream = indexStream;
Data_Stream = dataStream;
Metadata_Stream = metadataStream;
Cached_Nodes = new Dictionary <long, Node <T> >();
_cache = new Cache_LRU <long, Node <T> >(() => this.Current_Time);
_metadata = new Metadata {
Order = Order
};
Init();
}
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);
}
