@TransactionAttribute(TransactionAttributeType.REQUIRED)
public long openAccount(String name, float initialBalance) throws NegativeBalanceException {
checkForPositiveBalance(initialBalance);
Account account = new Account();
account.setBalance(initialBalance);
account.setName(name);
entityManager.persist(account);
return account.getId();
}
@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;
}
@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;
}