protected override void ReadContent(ByteReader reader)
{
var info = reader.ReadString(HEADER_INFO.Length);
var ver = reader.ReadByte();
if (info != HEADER_INFO)
{
throw LiteException.InvalidDatabase();
}
if (ver != FILE_VERSION)
{
throw LiteException.InvalidDatabaseVersion(ver);
}
ChangeID = reader.ReadUInt16();
FreeEmptyPageID = reader.ReadUInt32();
LastPageID = reader.ReadUInt32();
DbParams.Read(reader);
// read page collections references (position on end of page)
var cols = reader.ReadByte();
for (var i = 0; i < cols; i++)
{
CollectionPages.Add(reader.ReadString(), reader.ReadUInt32());
}
}
public HeaderPage()
: base(0)
{
FreeEmptyPageID = uint.MaxValue;
ChangeID = 0;
LastPageID = 0;
ItemCount = 1; // fixed for header
FreeBytes = 0; // no free bytes on header
DbParams = new DbParams();
CollectionPages = new Dictionary <string, uint>(StringComparer.OrdinalIgnoreCase);
}
protected override void WriteContent(ByteWriter writer)
{
writer.Write(HEADER_INFO, HEADER_INFO.Length);
writer.Write(FILE_VERSION);
writer.Write(ChangeID);
writer.Write(FreeEmptyPageID);
writer.Write(LastPageID);
DbParams.Write(writer);
writer.Write((byte)CollectionPages.Count);
foreach (var key in CollectionPages.Keys)
{
writer.Write(key);
writer.Write(CollectionPages[key]);
}
}
/// <summary>
/// Set a new dbversion
/// </summary>
public void SetParam(DbParams dbparams)
{
lock (_locker)
try
{
_transaction.Begin();
_transaction.AvoidDirtyRead();
var header = _pager.GetPage <HeaderPage>(0);
header.DbParams = dbparams;
_pager.SetDirty(header);
_transaction.Commit();
}
catch (Exception ex)
{
_log.Write(Logger.ERROR, ex.Message);
_transaction.Rollback();
throw;
}
}
/// <summary>
/// Set a new dbversion
/// </summary>
public void SetParam(DbParams dbparams)
{
lock (_locker)
try
{
_transaction.Begin();
_transaction.AvoidDirtyRead();
var header = _pager.GetPage<HeaderPage>(0);
header.DbParams = dbparams;
_pager.SetDirty(header);
_transaction.Commit();
}
catch (Exception ex)
{
_log.Write(Logger.ERROR, ex.Message);
_transaction.Rollback();
throw;
}
}