/// <summary>
/// Files and containers initialisation
/// </summary>
private void Init(int bFactor, int overflowBFactor, string mainFileDiskLetter, string overflowFileDiskLetter)
{
UtilityOperations.GetDiskFreeSpace(mainFileDiskLetter, out var SectorsPerCluster, out var BytesPerSector, out _, out _);
var ClusterSize = SectorsPerCluster * BytesPerSector;
_BFactor = bFactor == -1 ? (ClusterSize - 8) / _emptyClass.GetSize() : bFactor;
_OverflowBFactor = overflowBFactor == -1 ? (ClusterSize - 8) / _emptyClass.GetSize() : overflowBFactor;
_blocksInformations = new List <BlockInfo>((int)Math.Pow(2, _hashDepth));
var block = new Block <T>(_BFactor, _emptyClass.GetEmptyClass());
var overflowBlock = new Block <T>(_OverflowBFactor, _emptyClass.GetEmptyClass());
_fileManager = new FileManager(_filePath, block.GetSize());
_overflowManager = new OverflowFileManager <T>("overflow." + _filePath, overflowBlock.GetSize(), _emptyClass, _OverflowBFactor);
var address = _fileManager.GetFreeAddress();
_blocksInformations.Add(new BlockInfo {
Address = address, Depth = 1, Records = 0
});
WriteBlock(address, block);
address = _fileManager.GetFreeAddress();
_blocksInformations.Add(new BlockInfo {
Address = address, Depth = 1, Records = 0
});
WriteBlock(address, block);
}
public void Start()
{
Console.WriteLine("--- Extended Hashing Tester ---");
UtilityOperations.GetDiskFreeSpace("C:\\", out var SectorsPerCluster, out var BytesPerSector, out var NumberOfFreeClusters, out var TotalNumberOfClusters);
var ClusterSize = SectorsPerCluster * BytesPerSector;
var emptyProp = new Property();
Console.WriteLine($"Record size: {emptyProp.GetSize()}");
Console.WriteLine($"Cluster size: {ClusterSize}");
var bFactor = (ClusterSize - 8) / emptyProp.GetSize();
Console.WriteLine($"Recomended BFactor: {bFactor}");
Console.Write($"Blocking factor (default {bFactor}): ");
var inp = Console.ReadLine();
bFactor = string.IsNullOrWhiteSpace(inp) ? bFactor : int.Parse(inp);
Console.Write("File path (default file.dat): ");
inp = Console.ReadLine();
inp = String.IsNullOrWhiteSpace(inp) ? "file.dat" : inp;
hashing = new ExtendibleHashingDirectory <Property>(inp, bFactor, 9);
Console.Write("Seed (default is random): ");
inp = Console.ReadLine();
var seed = string.IsNullOrWhiteSpace(inp) ? Guid.NewGuid().GetHashCode() : int.Parse(inp);
Console.WriteLine($"Seed = {seed}");
rnd = new Random(seed);
helpStructure = new Dictionary <int, Property>();
do
{
Console.WriteLine();
PrintStats();
Console.WriteLine();
PrintMenu();
GetInput();
Console.WriteLine();
HandleInput();
} while (!exit);
}