public void Persist(MemTable memTable, int fileNumber)
{
var rowAt = 0;
var len = (memTable.Store.Count * (64 + 64 + 64 + 1)) + memTable.TotalKeyLength;
byte[] data = new byte[len];
foreach (var item in memTable.Store)
{
var keyBytesLength = item.Key.Length;
byte[] row = new byte[64 + keyBytesLength + 64 + 64];
var keyBytes = Encoding.ASCII.GetBytes(item.Key);
var keyLengthBytes = BitConverter.GetBytes((long)keyBytesLength);
var positionBytes = BitConverter.GetBytes(item.Value._postion);
var valueLengthBytes = BitConverter.GetBytes(item.Value._valueLen);
keyLengthBytes.CopyTo(row, 0);
keyBytes.CopyTo(row, 65);
positionBytes.CopyTo(row, 64 + keyBytesLength + 1);
valueLengthBytes.CopyTo(row, 64 + keyBytesLength + 64 + 1);
row.CopyTo(data, rowAt);
rowAt += row.Length + 1;
}
var indexFile = new FileStream(_kDB.DBPath + "/Index-" + fileNumber.ToString() + ".db", FileMode.CreateNew);
indexFile.Write(data, 0, len);
indexFile.Close();
}
public void Put(string key, FencePointer fencePointer)
{
if (_memTable.Count() >= 100000)
{
_memTable.Persist(++_lastIndexFileNumber);
_memTable = new MemTable(_kDB);
_dlinkedList.AddFirst(_memTable);
}
_memTable.Put(key, fencePointer);
}
public IndexManager(KDB kDB)
{
_kDB = kDB ?? throw new ArgumentNullException(nameof(kDB));
_lastIndexFileNumber = GetLastFileNumber();
_dlinkedList = new LinkedList <IIndexTable>();
LoadSSTables();
_memTable = new MemTable(kDB);
_dlinkedList.AddFirst(_memTable);
}
