/// <summary>
/// Get journal pages and override all into datafile
/// </summary>
public void Recovery()
{
_log.Write(Logger.Recovery, "initializing recovery mode");
using (_locker.Write())
{
// double check in header need recovery (could be already recover from another thread)
var header = BasePage.ReadPage(_disk.ReadPage(0)) as HeaderPage;
if (header.Recovery == false)
{
return;
}
// read all journal pages
foreach (var buffer in _disk.ReadJournal(header.LastPageID))
{
// read pageID (first 4 bytes)
var pageID = BitConverter.ToUInt32(buffer, 0);
_log.Write(Logger.Recovery, "recover page #{0:0000}", pageID);
// write in stream (encrypt if datafile is encrypted)
_disk.WritePage(pageID, _crypto == null || pageID == 0 ? buffer : _crypto.Encrypt(buffer));
}
// shrink datafile
_disk.ClearJournal(header.LastPageID);
}
}
/// <summary>
/// Try recovery journal file (if exists). Restore original datafile
/// Journal file are NOT encrypted (even when datafile are encrypted)
/// </summary>
public void Recovery()
{
var fileSize = _disk.FileLength;
// read all journal pages
foreach (var buffer in _disk.ReadJournal())
{
// read pageID (first 4 bytes)
var pageID = BitConverter.ToUInt32(buffer, 0);
_log.Write(Logger.RECOVERY, "recover page #{0:0000}", pageID);
// if header, read all byte (to get original filesize)
if (pageID == 0)
{
var header = (HeaderPage)BasePage.ReadPage(buffer);
fileSize = BasePage.GetSizeOfPages(header.LastPageID + 1);
}
// write in stream (encrypt if datafile is encrypted)
_disk.WritePage(pageID, _crypto == null || pageID == 0 ? buffer : _crypto.Encrypt(buffer));
}
_log.Write(Logger.RECOVERY, "resize datafile to {0} bytes", fileSize);
// redim filesize if grow more than original before rollback
_disk.SetLength(fileSize);
// empty journal file
_disk.ClearJournal();
}
