public class MoneyTransferService { /** * @param fromAccountId foydalanuvchi mablag'larni o'tkazayotganining yagona identifikatori * @param toAccountId mablag'lar o'tkazilayotgan foydalanuvchining yagona identifikatori * @param amount o'tkazma miqdori. Musbat son */ @Transactional public void transferMoney(Long fromAccountId, Long toAccountId, BigDecimal amount) { if (amount.compareTo(BigDecimal.ZERO) <= 0) { throw new RuntimeException("Miqdor musbat bo'lishi kerak"); } if (fromAccountId.equals(toAccountId)) { throw new RuntimeException("Hisob bir xil bo'lishi mumkin emas"); } Long firstId = Math.min(fromAccountId, toAccountId); Long secondId = Math.max(fromAccountId, toAccountId); Account first = accountRepository.findByIdForUpdate(firstId) .orElseThrow(() -> new RuntimeException("Hisob topilmadi")); Account second = accountRepository.findByIdForUpdate(secondId) .orElseThrow(() -> new RuntimeException("Hisob topilmadi")); Account from = fromAccountId.equals(firstId) ? first : second; Account to = fromAccountId.equals(firstId) ? second : first; if (from.getBalance().compareTo(amount) < 0) { throw new RuntimeException("Yetarli balans yo'q"); } from.setBalance(from.getBalance().subtract(amount)); to.setBalance(to.getBalance().add(amount)); accountRepository.save(to); accountRepository.save(from); } } @Entity @Data public class Account { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; private BigDecimal balance; }

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