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Introducing Ajax and Web 2.0 Since Tim O Reilly s article (www.oreillynet.com/pub/a/oreilly/tim/news/2005/09/ 30/what-is-web-20.html) pondered the possibility of a Web 2.0 on the horizon, it seems as if the whole Internet has been one big buzz trying to define what Web 2.0 might consist of. While we re not sure anyone has arrived at the definitive answer yet, it does appear that one technology which folks can agree on for building Web 2.0 applications is Ajax (Asynchronous JavaScript and XML). You can use Ajax with practically any web framework, and we believe using EJBs with Java EE based Ajax applications is not significantly different than using other web frameworks. You can easily expose stateless session beans as web services and access them from Ajax-based applications using some popular APIs such as JavaScript Object Notation (JSON).

The implementation of the TxController session facade shows that the arguments of an account operation must be checked by preconditions. If we focus on the withdrawal operation discussed before in the context of TxControllerPOJO, the implementation shown in Listing 11-15 is obtained. Listing 11-15. The Withdraw Implementation, with Arguments Checks Included 01 [...] 02 public void withdraw(BigDecimal amount,String description, 03 String accountId) 04 throws 05 InvalidParameterException, AccountNotFoundException, 06 InsufficientFundsException, InsufficientCreditException { 07 08 checkAccountArgs(amount, description, accountId); 09 Account account; 10 try { 11 account = findAccountByPrimaryKey(accountId); 12 } catch (Exception ex) { 13 throw new AccountNotFoundException(accountId); 14 } 15 try { 16 String type = account.getType(); 17 if (DomainUtil.isCreditAccount(type)) 18 throw new IllegalAccountTypeException(type); 19 BigDecimal newBalance = account.getBalance().subtract(amount); 20 if (newBalance.compareTo(bigZero) == -1) 21 throw new InsufficientFundsException(); 22 account.setBalance(newBalance); 23 createTx(amount.negate(),description,accountId, newBalance,account); 24 } catch (RemoteException ex) { 25 throw new EJBException("withdraw: " + ex.getMessage()); 26 } 27 28 } // withdraw 29 30 [...]

If you are interested in learning more about Ajax, check out the following resources:

2.2 2.3 2.4

Wikipedia (http://en.wikipedia.org/wiki/Ajax) Ajax: A New Approach to Web Applications, by Jesse James Garrett (www. adaptivepath.com/publications/essays/archives/000385.php) Ajax in Action, by Dave Crane and Eric Pascarello with Darren James (Manning, 2005) Ajax Matters (www.ajaxmatters.com/r/welcome) Ajaxian.com (www.ajaxian.com/) AjaxPatterns.org (http://ajaxpatterns.org/) Mozilla Ajax tutorial (http://developer.mozilla.org/en/docs/Ajax:Getting_Started)

That s a quick overview of MVC design patterns and technologies used in the presentation tier. Let s jump to the persistence tier to see what useful patterns we can find there.

2.5 2.6

With Spring AOP, an interceptor class must implement the interface org.aopalliance. MethodInterceptor and provide the implementation for the invoke method, which defines the code to be run before and after the joinpoints. The class in Listing 6-8 defines the interceptor TraceInterceptor as mentioned in the previous pointcut definition: Listing 6-8. A Trace Interceptor with Spring package aop.spring; import org.aopalliance.MethodInterceptor; import org.aopalliance.MethodInvocation; public class TraceInterceptor implements MethodInterceptor { public Object invoke(Invocation invocation) throws Throwable { String methodName = invocation.getMethod().getName(); System.out.println("-> Before "+methodName); Object rsp = invocation.proceed(); System.out.println("-> After "+methodName); return rsp; } } The method invoke is called by Spring AOP just before the occurrence of a joinpoint. The only argument of this call contains information about the joinpoint. The return type corresponds to the value returned by the aspect. Here, the interceptor displays a first message, calls the method proceed, displays a second message, and then returns. The proceed method has the same semantics as usual: it executes the advised method (also intercepted method or method joinpoint). Spring can only advise method calls: The creator of Spring considers field advising to be potentially harmful in the Spring context, since it violates the bean encapsulation principles.

Before ORM frameworks like Hibernate gained popularity, many application developers went with straight JDBC to develop data access code. Use of JDBC from business logic led to several maintenance problems, and the Data Access Object (DAO) design pattern was invented to decouple data access code from business logic. The DAO design pattern has been quite popular and has worked

not only with JDBC but also with ORM frameworks and CMP entity beans. The Entity Access Object pattern is a new incarnation of the DAO pattern that you can use with JPA.

2.8 2.9

While both DAO and EAO are variations of the same pattern, the EAO pattern has been updated to refer to EJB 3 entities. Since EJB 3 entities are POJOs, there is no need to continue the use of the Transfer Object/ Data Transfer Object pattern in conjunction the EAO pattern. Therefore, be aware that no transfer object is required for the EAO pattern.