Sometimes it is useful to be able to group messages transfers - sent and/or received - on a session into atomic grouping. This can be done be creating the session as transactional. On a transactional session sent messages only become available at the target address on commit. Likewise any received and acknowledged messages are only discarded at their source on commit ^[8] .

Connection connection(broker);
Session session =  connection.createTransactionalSession();
...
if (smellsOk())
   session.commit();
else
   session.rollback();
   

Connection connection = new Connection(broker);
Session session =  connection.CreateTransactionalSession();
...
if (smellsOk())
   session.Commit();
else
   session.Rollback();