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CHAPTER 12 USING AOP IN THE SAMPLE APPLICATION S PRESENTATION AND CLIENT TIERS
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20 System.out.println("Created new customer " + accountId); 21 deleguate.setAccountBalance(new BigDecimal(200), accountId); 22 System.out.println("Changed balance"); 23 AccountDetails details = deleguate.getAccountDetails(accountId); 24 System.out.println("Account details:"); 25 System.out.println(details); 26 } catch (Exception e) { 27 System.err.println(e.getMessage()); 28 e.printStackTrace(); 29 } 30 } 31 } Here, the client uses only the business delegate created in line 12. All the code related to remote communication is modularized in this object. As shown in the code in Listing 12-2, the business delegate is quite complex, as it integrates the calls to the getServiceFacade method, which implements the EJB lookup in the JNDI repository of the application server (line 34). This code uses a locator object, which we present later (see line 26 for its initialization). Listing 12-2. A Business Delegate Implementation for the Bank Application 001 002 003 004 005 006 007 008 009 010 011 012 013 014 015 016 017 018 019 020 021 022 023 024 025 026 027 package aop.j2ee.client.delegate; import import import import import java.math.BigDecimal; java.rmi.RemoteException; java.util.ArrayList; java.util.Date; java.util.ResourceBundle;
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import javax.ejb.CreateException; import javax.naming.NamingException; import import import import aop.j2ee.commons.exception.*; aop.j2ee.commons.to.AccountDetails; aop.j2ee.commons.to.CustomerDetails; aop.j2ee.commons.util.locator.ServiceLocator;
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import aop.j2ee.business.session.bank.BankHome; import aop.j2ee.business.session.bank.Bank; public class BankDelegate { private ResourceBundle messages; private static ServiceLocator locator; Bank bank = null; private void init() throws SystemException { try {
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CHAPTER 12 USING AOP IN THE SAMPLE APPLICATION S PRESENTATION AND CLIENT TIERS
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locator = ServiceLocator.getInstance(); } catch (NamingException ne) { throw new SystemException(ne.getMessage()); } } private Bank getServiceFacade() throws SystemException { if(bank!=null) return bank; try { BankHome home = (BankHome) locator.lookupHome(Bank.class); bank = home.create(); } catch (ClassNotFoundException cne) { throw new SystemException(cne.getMessage()); } catch (NamingException ne) { throw new SystemException(ne.getMessage()); } catch (CreateException ce) { throw new SystemException(ce.getMessage()); } catch (RemoteException re) { throw new SystemException(re.getMessage()); } return bank; } public BankDelegate() throws SystemException { if (locator == null) init(); } public void addCustomerToAccount(String customerId, String accountId) throws RemoteException, AccountNotFoundException, CustomerNotFoundException, CustomerInAccountException, InvalidParameterException { Bank bank; try { bank = getServiceFacade(); } catch (SystemException ex) { ex.printStackTrace(); return; } bank.addCustomerToAccount(customerId, accountId); } public String createAccount(String customerId,String type, String description,BigDecimal balance,BigDecimal creditLine, BigDecimal beginBalance, Date beginBalanceTimeStamp) throws
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CHAPTER 12 USING AOP IN THE SAMPLE APPLICATION S PRESENTATION AND CLIENT TIERS
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RemoteException, IllegalAccountTypeException, CustomerNotFoundException,InvalidParameterException { Bank bank; try { bank = getServiceFacade(); } catch (SystemException ex) { ex.printStackTrace(); return null; } return bank.createAccount( customerId,type,description,balance,creditLine,beginBalance, beginBalanceTimeStamp); } public String createCustomer(String lastName,String firstName, String middleInitial,String street,String city,String state, String zip,String phone,String email) throws InvalidParameterException, RemoteException { Bank bank; try { bank = getServiceFacade(); } catch (SystemException ex) { ex.printStackTrace(); return null; } return bank.createCustomer(lastName,firstName,middleInitial, street,city,state,zip,phone,email); } public AccountDetails getAccountDetails(String accountId) throws RemoteException, AccountNotFoundException, InvalidParameterException { Bank bank; try { bank = getServiceFacade(); } catch (SystemException ex) { ex.printStackTrace(); return null; } return bank.getAccountDetails(accountId); } [...] // same delegation pattern // to the bank for the other services
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CHAPTER 12 USING AOP IN THE SAMPLE APPLICATION S PRESENTATION AND CLIENT TIERS
With each business delegate method, we retrieve the instance of the session facade introduced in 11 (line 63) and we call the corresponding service of this facade with the needed arguments (line 68). Another advantage of the business delegate is that it encapsulates the remote communication strategies. For instance, timeout, retry, and caching policies can be implemented within the delegate so that the client code becomes more independent from these nonfunctional concerns. Next, the code in Listing 12-3 shows the implementation of a simple retry policy within a delegate. This policy makes the application more stable if the network or server is temporarily unavailable. In this case, if the service resolving fails, we stop the current thread during one second (line 17) before retrying (line 18). Similarly, if we encounter an error during the invocation, we wait one second (line 33) and recursively retry (line 35). Note that we force the resolution of the facade in line 34. Listing 12-3. Adding a Retry Policy to the Bank Delegate 01 public class BankDelegate { 02 03 [...] 04 05 public String createAccount(String customerId, String type, String descr, 06 BigDecimal balance, BigDecimal creditLine, BigDecimal beginBalance, 07 Date beginBalanceTimeStamp) 08 throws 09 RemoteException, IllegalAccountTypeException, CustomerNotFoundException, 10 InvalidParameterException { 11 12 Bank bank; 13 try { 14 bank= getServiceFacade(); 15 } catch (SystemException ex) { 16 try { 17 Thread.sleep(1000); 18 bank= getServiceFacade(); 19 } catch (SystemException ex2) { 20 ex2.printStackTrace(); 21 return null; 22 } catch (InterruptedException ex2) { 23 ex2.printStackTrace(); 24 return null; 25 } 26 } 27 String result=null; 28 try { 29 result = bank.createAccount(customerId, type, descr, balance, creditLine,
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