public UInt64LinksTransactionsLayer(ILinks <ulong> links, string logAddress)
: base(links)
{
if (string.IsNullOrWhiteSpace(logAddress))
{
throw new ArgumentNullException(nameof(logAddress));
}
// В первой строке файла хранится последняя закоммиченную транзакцию.
// При запуске это используется для проверки удачного закрытия файла лога.
// In the first line of the file the last committed transaction is stored.
// On startup, this is used to check that the log file is successfully closed.
var lastCommitedTransition = FileHelpers.ReadFirstOrDefault <Transition>(logAddress);
var lastWrittenTransition = FileHelpers.ReadLastOrDefault <Transition>(logAddress);
if (!lastCommitedTransition.Equals(lastWrittenTransition))
{
Dispose();
throw new NotSupportedException("Database is damaged, autorecovery is not supported yet.");
}
if (lastCommitedTransition == default)
{
FileHelpers.WriteFirst(logAddress, lastCommitedTransition);
}
_lastCommitedTransition = lastCommitedTransition;
// TODO: Think about a better way to calculate or store this value
var allTransitions = FileHelpers.ReadAll <Transition>(logAddress);
_lastCommitedTransactionId = allTransitions.Length > 0 ? allTransitions.Max(x => x.TransactionId) : 0;
_uniqueTimestampFactory = new UniqueTimestampFactory();
_logAddress = logAddress;
_log = FileHelpers.Append(logAddress);
_transitions = new Queue <Transition>();
_transitionsPusher = new Task(TransitionsPusher);
_transitionsPusher.Start();
}