@BA
class MyService
{
  @ServiceRequest
  @CompensatedBy(method="cancelTicket")
  int bookTicket(Customer customer, CreditCard card)

  void cancelTicket(Customer customer, CreditCard card) {...}

  @ServiceRequest
  @CompensatedBy(method="cancelFood")
  int bookFood(Customer customer, CreditCard card)

  void cancelFood(Customer customer, CreditCard card) {...}
}