/// <summary>
/// Clear data file, close any data stream pool, change password and re-create data factory
/// </summary>
public void ChangePassword(string password, EngineSettings settings)
{
if (settings.Password == password)
{
return;
}
// empty data file
this.SetLength(0, FileOrigin.Data);
// close all streams
_dataPool.Dispose();
// delete data file
_dataFactory.Delete();
settings.Password = password;
// new datafile will be created with new password
_dataFactory = settings.CreateDataFactory();
// create stream pool
_dataPool = new StreamPool(_dataFactory, false);
// get initial data file length
_dataLength = -PAGE_SIZE;
}
public DiskReader(MemoryCache cache, StreamPool streamPool)
{
_cache = cache;
_streamPool = streamPool;
// use lazy because you can have transaction that will read only from cache
_stream = new Lazy <Stream>(() => _streamPool.Rent());
}
public DiskReader(MemoryCache cache, StreamPool dataPool, StreamPool logPool)
{
_cache = cache;
_dataPool = dataPool;
_logPool = logPool;
_dataStream = new Lazy <Stream>(() => _dataPool.Rent());
_logStream = new Lazy <Stream>(() => _logPool.Rent());
}
public SortDisk(IStreamFactory factory, int containerSize, EnginePragmas pragmas)
{
ENSURE(containerSize % PAGE_SIZE == 0, "size must be PAGE_SIZE multiple");
_factory = factory;
_containerSize = containerSize;
_pragmas = pragmas;
_lastContainerPosition = -containerSize;
_pool = new StreamPool(_factory, false);
}
public SortDisk(IStreamFactory factory, int containerSize, bool utcDate)
{
ENSURE(containerSize % PAGE_SIZE == 0, "size must be PAGE_SIZE multiple");
_factory = factory;
_containerSize = containerSize;
_utcDate = utcDate;
_lastContainerPosition = -containerSize;
_pool = new StreamPool(_factory, false);
}
public DiskService(EngineSettings settings, int memorySegmentSize)
{
_cache = new MemoryCache(memorySegmentSize);
// get new stream factory based on settings
_dataFactory = settings.CreateDataFactory();
_logFactory = settings.CreateLogFactory();
// create stream pool
_dataPool = new StreamPool(_dataFactory, false);
_logPool = new StreamPool(_logFactory, true);
var isNew = _dataFactory.Exists() == false;
// create lazy async writer queue for log file
_queue = new Lazy <DiskWriterQueue>(() => new DiskWriterQueue(_logPool.Writer));
// create new database if not exist yet
if (isNew)
{
LOG($"creating new database: '{Path.GetFileName(_dataFactory.Name)}'", "DISK");
this.Initialize(_dataPool.Writer, settings.InitialSize);
}
// if not readonly, force open writable datafile
if (settings.ReadOnly == false)
{
var dummy = _dataPool.Writer.CanRead;
}
// get initial data file length
_dataLength = _dataFactory.GetLength() - PAGE_SIZE;
// get initial log file length
if (_logFactory.Exists())
{
_logLength = _logFactory.GetLength() - PAGE_SIZE;
}
else
{
_logLength = -PAGE_SIZE;
}
}
public DiskService(EngineSettings settings, int[] memorySegmentSizes)
{
_cache = new MemoryCache(memorySegmentSizes);
// get new stream factory based on settings
_streamFactory = settings.CreateDataFactory();
// create stream pool
_streamPool = new StreamPool(_streamFactory, settings.ReadOnly);
// create async writer queue for log file
_queue = new DiskWriterQueue(_streamPool.Writer);
// checks if is a new file
var isNew = settings.ReadOnly == false && _streamPool.Writer.Length == 0;
// create new database if not exist yet
if (isNew)
{
LOG($"creating new database: '{Path.GetFileName(_streamFactory.Name)}'", "DISK");
_header = this.Initialize(_streamPool.Writer, settings.Collation, settings.InitialSize);
}
else
{
// load header page from position 0 from file
var stream = _streamPool.Rent();
var buffer = new PageBuffer(new byte[PAGE_SIZE], 0, 0)
{
Position = 0
};
try
{
stream.Position = 0;
stream.Read(buffer.Array, 0, PAGE_SIZE);
// if first byte are 1 this datafile are encrypted but has do defined password to open
if (buffer[0] == 1)
{
throw new LiteException(0, "This data file is encrypted and needs a password to open");
}
_header = new HeaderPage(buffer);
_streamPool.Return(stream);
}
catch
{
// return to pool before dispose
_streamPool.Return(stream);
this.Dispose();
throw;
}
}
// define start/end position for log content
_logStartPosition = (_header.LastPageID + 1) * PAGE_SIZE;
_logEndPosition = _logStartPosition; // will be updated by RestoreIndex
}
