TicketService.java

public interface TicketService {
/**
* The number of seats in the venue that are neither held nor reserved
*
* @return the number of tickets available in the venue
*/
 int numSeatsAvailable();
/**
* Find and hold the best available seats for a customer
*
* @param numSeats the number of seats to find and hold
* @param customerEmail unique identifier for the customer
* @return a SeatHold object identifying the specific seats and related
information
*/
 SeatHold findAndHoldSeats(int numSeats, String customerEmail);
/**
* Commit seats held for a specific customer
*
* @param seatHoldId the seat hold identifier
* @param customerEmail the email address of the customer to which the
seat hold is assigned
* @return a reservation confirmation code
*/
String reserveSeats(int seatHoldId, String customerEmail);
}