def rollback(self):
"""Roll-back the transaction. First, the transaction is closed.
Every transaction on the stack is then marked for roll-back. If
the stack is empty, a TransactionRollback event is emited."""
self._close()
for tx in self._stack:
tx._need_rollback = True
else:
if not self._stack:
self._handle(TransactionRollback())
def commit(self):
"""Commit the transaction. First, the transaction is closed.
If it needs to be rolled-back, a TransactionRollback event is emited.
Otherwise, a TransactionCommit event is emited."""
self._close()
if not self._stack:
if self._need_rollback:
self._handle(TransactionRollback())
else:
self._handle(TransactionCommit())