Example #1
0
        public Transaction NewTransaction(TransactionFlags flags)
        {
            bool txLockTaken = false;

            try
            {
                long txId = _transactionsCounter;
                if (flags == (TransactionFlags.ReadWrite))
                {
                    txId = _transactionsCounter + 1;
                    _txWriter.Wait();
                    txLockTaken = true;
                }
                var tx = new Transaction(_pager, this, txId, flags, _freeSpaceRepository);
                _activeTransactions.TryAdd(txId, tx);
                var state = _pager.TransactionBegan();
                tx.AddPagerState(state);

                if (flags == TransactionFlags.ReadWrite)
                {
                    _freeSpaceRepository.UpdateSections(tx, OldestTransaction);
                }
                return(tx);
            }
            catch (Exception)
            {
                if (txLockTaken)
                {
                    _txWriter.Release();
                }
                throw;
            }
        }
Example #2
0
        public Transaction NewTransaction(TransactionFlags flags, TimeSpan?timeout = null)
        {
            bool txLockTaken = false;

            try
            {
                if (flags == (TransactionFlags.ReadWrite))
                {
                    var wait = timeout ?? (Debugger.IsAttached ? TimeSpan.FromMinutes(30) : TimeSpan.FromSeconds(30));
                    if (_txWriter.Wait(wait) == false)
                    {
                        throw new TimeoutException("Waited for " + wait +
                                                   " for transaction write lock, but could not get it");
                    }
                    txLockTaken = true;

                    if (_endOfDiskSpace != null)
                    {
                        if (_endOfDiskSpace.CanContinueWriting)
                        {
                            Debug.Assert(_flushingTask.Status == TaskStatus.Canceled || _flushingTask.Status == TaskStatus.RanToCompletion);
                            _cancellationTokenSource = new CancellationTokenSource();
                            _flushingTask            = FlushWritesToDataFileAsync();
                            _endOfDiskSpace          = null;
                        }
                    }
                }

                long        txId;
                Transaction tx;

                _txCommit.EnterReadLock();
                try
                {
                    txId = flags == TransactionFlags.ReadWrite ? _transactionsCounter + 1 : _transactionsCounter;
                    tx   = new Transaction(this, txId, flags, _freeSpaceHandling);
                }
                finally
                {
                    _txCommit.ExitReadLock();
                }

                _activeTransactions.Add(tx);
                var state = _dataPager.TransactionBegan();
                tx.AddPagerState(state);

                if (flags == TransactionFlags.ReadWrite)
                {
                    tx.AfterCommit = TransactionAfterCommit;
                }

                return(tx);
            }
            catch (Exception)
            {
                if (txLockTaken)
                {
                    _txWriter.Release();
                }
                throw;
            }
        }