RSA7.5 下一个EJB3例子，WAS 7.0 + ORACLE10g

package itso.bank.facade; import itso.bank.model.ejb.Account; import itso.bank.model.ejb.Customer; import itso.bank.model.ejb.Transaction; /** * The facade for the ITSO bank. * * The class is a singleton, controlled through the static method <code>getBank</code>. * * The class is used as follows (this example retrieves an Account object * for a given account number): * * <pre> * Bank bank = Bank.getBank(); * Account account = bank.getAccount(accountNumber); * </pre> * * @see Bank#getBank() */ public abstract class Bank { /** * The Bank singleton */ private static Bank singleton = null; /** * Create a singleton. The method will ensure that only * one Bank object is created. * * @throws ApplicationException If an application-level non-business related * exception occurred. * * @see Bank#Bank() */ public static Bank getBank() throws Exception { if (singleton == null) { // no singleton has been created yet - create one //singleton = new MemoryBank(); singleton = new EJBBank(); } return singleton; } /** * Retrieve a Customer object for a given customer number (SSN). * * @param customerNumber The customer number (SSN) to look up. * @return A Customer instance, representing that customer. * @throws UnknownCustomerException If the specified customer * does not exist. * @throws ApplicationException If an application-level non-business related * exception occurred. * * @see Customer */ public abstract Customer getCustomer(String customerNumber) throws Exception; /** * Retrieve an array of the accounts for a given customer * number (SSN). * * @param customerNumber The customer number (SSN) to look up. * @return An array of Account instances, each representing an * account that the customer owns within the bank. * @throws UnknownCustomerException If the specified customer * does not exist. * @throws ApplicationException If an application-level non-business related * exception occurred. * * @see Account */ public abstract Account[] getAccounts(String customerNumber) throws Exception; /** * Retrieve an Account object for a given account number. * * @param accountNumber The account number to look up. * @return An Account instance, representing the given * account number. * @throws UnknownAccountException If the account does not * exist. * @throws ApplicationException If an application-level non-business related * exception occurred. * * @see Account */ public abstract Account getAccount(String accountNumber) throws Exception; /** * Retrieve an array of transaction records for the given account. * * @param accountId The account number to retrieve the transaction * log for. * @return An array of instances of the Transaction class, each * representing a movement on the account. If the account has * had no transaction, an empty array (an array of length zero) * is returned. * @throws UnknownAccountException If the specified account does not exist. * @throws ApplicationException If an application-level non-business related * exception occurred. * * @see Transaction */ public abstract Transaction[] getTransactions(String accountId) throws Exception; /** * Update the customer data for the specified customer. The specified SSN * must match an existing customer. * * @param ssn * @param title * @param firstName * @param lastName * @throws UnknownCustomerException If either of the accounts do not exist. * @throws ApplicationException If an application-level non-business related * exception occurred. */ public abstract void updateCustomer(String ssn, String title, String firstName, String lastName) throws Exception; /** * Deposit (credit) the specified amount of cents to * the specified account. * * After a successful transaction, the transaction log for * the account will be updated. * * @param accountId The account number to deposit into. * @param amount The amount to deposit, in cents. * @throws UnknownAccountException If the account does not exist. * @throws ApplicationException If an application-level non-business related * exception occurred. */ public abstract void deposit(String accountId, int amount) throws Exception; /** * Withdraw (debit) the specified amount of cents from * the specified account. * * After a successful transaction, the transaction log for * the account will be updated. * * @param accountId The account number to withdraw from. * @param amount The amount to withdraw, in cents. * @throws UnknownAccountException If the account does not exist. * @throws InsufficientFundsException If the amount exceeds the * current balance of the account. * @throws ApplicationException If an application-level non-business related * exception occurred. */ public abstract void withdraw(String accountId, int amount) throws Exception; /** * Transfer the specified amount of cents from one account to * another. The accounts do not need to be owned by the same customer. * * After a successful transaction, the transaction log for * both accounts will be updated. * * @param debitAccountNumber The account number to withdraw (debit) from. * @param creditAccountNumber The account number to deposit (credit) to. * @param amount The amount to transfer, in cents. * @throws UnknownAccountException If either of the accounts do not exist. * @throws InsufficientFundsException If the amount exceeds the * current balance of the debit account. * @throws ApplicationException If an application-level non-business related * exception occurred. */ public abstract void transfer(String debitAccountNumber, String creditAccountNumber, int amount) throws Exception; }