@AT
class MyService
{
  @ServiceRequest
  int bookTicket(Customer customer, CreditCard card)

  @Prepare(method="bookTicket") void prpeareBooking() {...}
  @Commit(method="bookTicket") void commitBooking() {...}
  @Rollback(method="bookTicket") void rollbackBooking() {...}

  @ServiceRequest
  int cancelTicket(Customer customer, CreditCard card)

  @Prepare(method="cancelTicket") void prpeareCancelation() {...}
  @Commit(method="cancelTicket") void commitCancelation() {...}
  @Rollback(method="cancelTicket") void rollbackCancelation() {...}
}