#657 implement code url

[syjer]

can be merged WIP: still some details to handle

[coveralls]

Coverage increased (+0.9%) to 55.967% when pulling 5d5c280 on 657-implement-code-url into a8104fa on master.

[syjer]

note:

cleanup:

we can avoid the dance of passing the reservationId in bindToSession and then doing a select by using an update+returning clause.

private List<SpecialPrice> reserveTokens(String reservationId, TicketReservationWithOptionalCodeModification ticketReservation, PromoCodeDiscount discount) {
        try {
            int count = specialPriceRepository.bindToSession(reservationId, ticketReservation.getTicketCategoryId(), discount.getId(), ticketReservation.getAmount());
            if(count != ticketReservation.getAmount()) {
                throw new NotEnoughTicketsException();
            }
            return specialPriceRepository.findBySessionIdAndAccessCodeId(reservationId, discount.getId());
        } catch (Exception e) {
            log.trace("constraints violated", e);
            if(e instanceof NotEnoughTicketsException) {
                throw e;
            }
            throw new TooManyTicketsForDiscountCodeException();
        }
    }