/// <param name="objectWriter"> The object writer </param>
/// <param name="objectReader"> The object reader </param>
/// <param name="currentIdBlock">Current Id block data </param>
public IdManager(IObjectWriter objectWriter, IObjectReader objectReader, CurrentIdBlockInfo currentIdBlock)
{
_objectWriter = objectWriter;
_objectReader = objectReader;
_currentBlockIdPosition = currentIdBlock.CurrentIdBlockPosition;
_currentBlockIdNumber = currentIdBlock.CurrentIdBlockNumber;
_maxId = new ObjectOID((long)currentIdBlock.CurrentIdBlockNumber * StorageEngineConstant.NbIdsPerBlock);
_nextId = new ObjectOID(currentIdBlock.CurrentIdBlockMaxOid.ObjectId + 1);
_lastIds = new OID[IdBufferSize];
for (var i = 0; i < IdBufferSize; i++)
_lastIds[i] = StorageEngineConstant.NullObjectId;
_lastIdPositions = new long[IdBufferSize];
_lastIdIndex = 0;
}
public void ReadDatabaseHeader()
{
var version = ReadDatabaseVersion();
StorageEngineConstant.CheckDbVersionCompatibility(version);
var databaseIdsArray = new long[4];
databaseIdsArray[0] = _fsi.ReadLong();
databaseIdsArray[1] = _fsi.ReadLong();
databaseIdsArray[2] = _fsi.ReadLong();
databaseIdsArray[3] = _fsi.ReadLong();
IDatabaseId databaseId = new DatabaseId(databaseIdsArray);
var nbClasses = ReadNumberOfClasses();
var firstClassPosition = ReadFirstClassOid();
if (nbClasses < 0)
{
throw new CorruptedDatabaseException(
NDatabaseError.NegativeClassNumberInHeader.AddParameter(nbClasses).AddParameter(firstClassPosition));
}
ReadLastOdbCloseStatus();
ReadDatabaseCharacterEncoding();
var currentBlockPosition = _fsi.ReadLong();
// Gets the current id block number
_fsi.SetReadPosition(currentBlockPosition + StorageEngineConstant.BlockIdOffsetForBlockNumber);
var currentBlockIdNumber = _fsi.ReadInt();
var blockMaxId = OIDFactory.BuildObjectOID(_fsi.ReadLong());
_storageEngine.SetDatabaseId(databaseId);
var currentBlockInfo = new CurrentIdBlockInfo
{
CurrentIdBlockPosition = currentBlockPosition,
CurrentIdBlockNumber = currentBlockIdNumber,
CurrentIdBlockMaxOid = blockMaxId
};
_storageEngine.SetCurrentIdBlockInfos(currentBlockInfo);
}
/// <summary>
/// Creates the header of the file
/// </summary>
/// <param name="storageEngine">Storage engine </param>
/// <param name="creationDate"> The creation date </param>
public void CreateEmptyDatabaseHeader(IStorageEngine storageEngine, long creationDate)
{
WriteVersion();
WriteDatabaseId(storageEngine, creationDate);
WriteNumberOfClasses(0, false);
WriteFirstClassInfoOID(StorageEngineConstant.NullObjectId, false);
WriteLastOdbCloseStatus(false, false);
WriteDatabaseCharacterEncoding();
// This is the position of the first block id. But it will always contain the position of the current id block
FileSystemInterface.WriteLong(StorageEngineConstant.DatabaseHeaderFirstIdBlockPosition, false); // current id block position
// Write an empty id block
WriteIdBlock(-1, StorageEngineConstant.IdBlockSize, BlockStatus.BlockNotFull, 1, -1, false);
Flush();
var currentBlockInfo = new CurrentIdBlockInfo
{
CurrentIdBlockPosition = StorageEngineConstant.DatabaseHeaderFirstIdBlockPosition,
CurrentIdBlockNumber = 1,
CurrentIdBlockMaxOid = OIDFactory.BuildObjectOID(0)
};
storageEngine.SetCurrentIdBlockInfos(currentBlockInfo);
}
