/// <summary>
/// Starts a new transaction - lock database to garantee that only one processes is in a transaction
/// </summary>
public void Begin()
{
if (_level == 0)
{
// lock (or try to) datafile
_disk.Lock();
// get header page from DISK to check changeID
var header = _disk.ReadPage <HeaderPage>(0);
// if changeID was changed, file was changed by another process
if (header.ChangeID != _cache.Header.ChangeID)
{
_cache.Clear(header);
}
}
_level++;
}
private void DoRecovery(BinaryReader reader)
{
// open disk service
using (var disk = new DiskService(_connectionString))
{
disk.Lock();
// while pages, read from redo, write on disk
while (reader.BaseStream.Position != reader.BaseStream.Length)
{
var page = this.ReadPageJournal(reader);
disk.WritePage(page);
}
reader.Close();
disk.UnLock();
}
}