public IndexFile(string filename, byte maxKeySize)
{
_T = RDBDataType <T> .ByteHandler();
if (typeof(T) == typeof(string))
{
_externalStrings = true;
_maxKeySize = 4;// blocknum:int
}
else
{
_maxKeySize = maxKeySize;
}
_PageNodeCount = Global.PageItemCount; // pageNodeCount;
_rowSize = (_maxKeySize + 1 + 4 + 4); //行的大小
string path = Path.GetDirectoryName(filename);
Directory.CreateDirectory(path);
if (File.Exists(filename))
{
// if file exists open and read header
_file = File.Open(filename, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
this.ReadFileHeader();
if (_externalStrings == false)// if the file says different
{
_rowSize = (_maxKeySize + 1 + 4 + 4);
}
// compute last page number from file length
_PageLength = (_BlockHeader.Length + _rowSize * (_PageNodeCount));
_LastPageNumber = (int)((_file.Length - _FileHeader.Length) / _PageLength);
}
else
{
// else create new file
_file = File.Open(filename, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite);
_PageLength = (_BlockHeader.Length + _rowSize * (_PageNodeCount));
this.CreateFileHeader(0);
_LastPageNumber = (int)((_file.Length - _FileHeader.Length) / _PageLength);
}
if (_externalStrings)
{
_strings = new KeyStoreHF(path, Path.GetFileNameWithoutExtension(filename) + ".strings");
}
if (_LastPageNumber == 0)
{
_LastPageNumber = 1;
}
// bitmap duplicates
if (_allowDups)
{
_bitmap = new BitmapIndex(Path.GetDirectoryName(filename), Path.GetFileNameWithoutExtension(filename));
}
}
public MGIndex(string path, string filename, byte keysize, bool allowdups)
{
_AllowDuplicates = allowdups;
_index = new IndexFile <T>(Path.Combine(path, filename), keysize);
// load page list
_index.GetPageList(_pageListDiskPages, _pageList, out _LastIndexedRecordNumber);
if (_pageList.Count == 0)
{
Page <T> page = new Page <T>();
page.FirstKey = (T)RDBDataType <T> .GetEmpty();
page.DiskPageNumber = _index.GetNewPageNumber();
page.isDirty = true;
_pageList.Add(page.FirstKey, new PageInfo(page.DiskPageNumber, 0, 0));
_cache.Add(page.DiskPageNumber, page);
}
}
/// <summary>
/// 初始化
/// </summary>
/// <param name="filename"></param>
/// <param name="maxkeysize"></param>
/// <param name="AllowDuplicateKeys"></param>
private void Initialize(string filename, byte maxkeysize, bool AllowDuplicateKeys)
{
_MaxKeySize = RDBDataType <T> .GetByteSize(maxkeysize);
_T = RDBDataType <T> .ByteHandler();
_Path = Path.GetDirectoryName(filename);
Directory.CreateDirectory(_Path);
_FileName = Path.GetFileNameWithoutExtension(filename);
string db = Path.Combine(_Path, _FileName + _datExtension);
_index = new MGIndex <T>(_Path, _FileName + _idxExtension, _MaxKeySize, AllowDuplicateKeys);
if (Global.SaveAsBinaryJSON)
{
_archive = new StorageFile <T>(db, SF_FORMAT.BSON, false);
}
else
{
_archive = new StorageFile <T>(db, SF_FORMAT.JSON, false);
}
_deleted = new BoolIndex(_Path, _FileName);
log.Debug("Current Count = " + RecordCount().ToString("#,0"));
CheckIndexState();
//保存服务
log.Debug("Starting save timer");
_savetimer = new System.Timers.Timer();
_savetimer.Elapsed += new System.Timers.ElapsedEventHandler(_savetimer_Elapsed);
_savetimer.Interval = Global.SaveIndexToDiskTimerSeconds * 1000;
_savetimer.AutoReset = true;
_savetimer.Start();
}
/// <summary>
/// 初始化
/// </summary>
/// <param name="filename"></param>
/// <param name="StorageOnlyMode"></param>
private void Initialize(string filename, bool StorageOnlyMode)
{
_T = RDBDataType <T> .ByteHandler();
_filename = filename;
// search for mgdat00000 extensions -> split files load
if (File.Exists(filename + _splitfileExtension))
{
LoadSplitFiles(filename);
}
if (File.Exists(filename) == false)
{
_datawrite = new FileStream(filename, FileMode.CreateNew, FileAccess.ReadWrite, FileShare.ReadWrite);
}
else
{
_datawrite = new FileStream(filename, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
}
_dataread = new FileStream(_filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
if (_datawrite.Length == 0)
{
// new file
//写入头信息
_datawrite.Write(_fileheader, 0, _fileheader.Length);
_datawrite.Flush();
_lastWriteOffset = _fileheader.Length;
}
else
{
long i = _datawrite.Seek(0L, SeekOrigin.End);
if (_files.Count == 0)
{
_lastWriteOffset = i;
}
else
{
_lastWriteOffset += i; // add to the splits
}
}
if (StorageOnlyMode == false)
{
//加载记录指针
// load rec pointers
_recfilename = filename.Substring(0, filename.LastIndexOf('.')) + _recExtension;
if (File.Exists(_recfilename) == false)
{
_recfilewrite = new FileStream(_recfilename, FileMode.CreateNew, FileAccess.Write, FileShare.ReadWrite);
}
else
{
_recfilewrite = new FileStream(_recfilename, FileMode.Open, FileAccess.Write, FileShare.ReadWrite);
}
_recfileread = new FileStream(_recfilename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
_lastRecordNum = (int)(_recfilewrite.Length / 8);
_recfilewrite.Seek(0L, SeekOrigin.End);
}
}
