public Snapshot(LockMode mode, string collectionName, HeaderPage header, uint transactionID, TransactionPages transPages, LockService locker, WalIndexService walIndex, DiskReader reader, bool addIfNotExists)
{
_mode = mode;
_collectionName = collectionName;
_header = header;
_transactionID = transactionID;
_transPages = transPages;
_locker = locker;
_walIndex = walIndex;
_reader = reader;
// enter in lock mode according initial mode
if (mode == LockMode.Read)
{
_locker.EnterRead(_collectionName);
}
else
{
_locker.EnterReserved(_collectionName);
}
// get lastest read version from wal-index
_readVersion = _walIndex.CurrentReadVersion;
var srv = new CollectionService(_header, this, _transPages);
// read collection (create if new - load virtual too)
srv.Get(_collectionName, addIfNotExists, ref _collectionPage);
// clear local pages (will clear _collectionPage link reference)
if (_collectionPage != null)
{
_localPages.Remove(_collectionPage.PageID);
}
}
