@TransactionAttribute(TransactionAttributeType.REQUIRED)
public float withdraw(long accountNumber, float amount)
throws NegativeBalanceException, InsufficientBalanceException, AccountNotFoundException {
checkForPositiveBalance(amount);
Account account = findAccount(accountNumber);
if (account.getBalance() < amount) {
throw new InsufficientBalanceException();
}
float newBalance = account.getBalance() - amount;
account.setBalance(newBalance);
entityManager.merge(account);
return newBalance;
}
@TransactionAttribute(TransactionAttributeType.REQUIRED)
public float close(long accountNumber)
throws InsufficientBalanceException, AccountNotFoundException {
Account account = findAccount(accountNumber);
float remainingBalance = account.getBalance();
entityManager.remove(account);
return remainingBalance;
}
@TransactionAttribute(TransactionAttributeType.REQUIRED)
public float deposit(long accountNumber, float amount)
throws NegativeBalanceException, AccountNotFoundException {
checkForPositiveBalance(amount);
Account account = findAccount(accountNumber);
float newBalance = account.getBalance() + amount;
account.setBalance(newBalance);
entityManager.merge(account);
return newBalance;
}
