void NewWrittingTransactionUnsafe(TaskCompletionSource <IKeyValueDBTransaction> tcs)
{
var newTransactionRoot = LastCommited.NewTransactionRoot();
_writingTransaction = new KeyValueDBTransaction(this, newTransactionRoot, true, false);
tcs.SetResult(_writingTransaction);
}
internal IBTreeRootNode MakeWrittableTransaction(KeyValueDBTransaction keyValueDBTransaction, IBTreeRootNode btreeRoot)
{
lock (_writeLock)
{
if (_writingTransaction != null)
{
throw new BTDBTransactionRetryException("Another writting transaction already running");
}
if (LastCommited != btreeRoot)
{
throw new BTDBTransactionRetryException("Another writting transaction already finished");
}
_writingTransaction = keyValueDBTransaction;
return(btreeRoot.NewTransactionRoot());
}
}
internal void CommitWrittingTransaction(IBTreeRootNode btreeRoot, bool temporaryCloseTransactionLog)
{
var deltaUlong = unchecked (btreeRoot.CommitUlong - _lastCommited.CommitUlong);
if (deltaUlong != 0)
{
_writerWithTransactionLog.WriteUInt8((byte)KVCommandType.CommitWithDeltaUlong);
_writerWithTransactionLog.WriteVUInt64(deltaUlong);
}
else
{
_writerWithTransactionLog.WriteUInt8((byte)KVCommandType.Commit);
}
if (DurableTransactions || !temporaryCloseTransactionLog)
{
_writerWithTransactionLog.FlushBuffer();
}
UpdateTransactionLogInBTreeRoot(btreeRoot);
if (DurableTransactions)
{
_fileWithTransactionLog.HardFlush();
}
if (temporaryCloseTransactionLog)
{
_writerWithTransactionLog.WriteUInt8((byte)KVCommandType.TemporaryEndOfFile);
_writerWithTransactionLog.FlushBuffer();
if (DurableTransactions)
{
_fileWithTransactionLog.HardFlush();
}
_fileWithTransactionLog.Truncate();
}
lock (_writeLock)
{
_writingTransaction = null;
_lastCommited = btreeRoot;
TryDequeWaiterForWrittingTransaction();
}
}
internal void RevertWrittingTransaction(bool nothingWrittenToTransactionLog)
{
if (!nothingWrittenToTransactionLog)
{
_writerWithTransactionLog.WriteUInt8((byte)KVCommandType.Rollback);
var newRoot = _lastCommited.CloneRoot();
UpdateTransactionLogInBTreeRoot(newRoot);
lock (_writeLock)
{
_writingTransaction = null;
_lastCommited = newRoot;
TryDequeWaiterForWrittingTransaction();
}
}
else
{
lock (_writeLock)
{
_writingTransaction = null;
TryDequeWaiterForWrittingTransaction();
}
}
}
