Application Events

Booking booking = bookings.save(new Booking(seat, customer, PRICE_IN_CENTS));
notifier.bookingConfirmed(booking);
seatMap.markTaken(seat);
salesReport.add(booking);
return new BookingResponse(booking.getId(), request.eventId(), seat.getLabel(), "CONFIRMED");

These lines end a version of BookingService.book that calls every interested class directly. The first line does the booking. The next three tell other parts of the service that a booking happened, and each of them is a constructor parameter of BookingService

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