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With this aspect, the implementation of an authentication controller, for instance, focuses only on the request treatment implementation, as shown in Listing 12-19, still by using an implicit protocol (line 18). Listing 12-19. An Aspectized Login Controller 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 package aop.j2ee.client.web.controller; import import import import import aop.j2ee.client.web.controller.ApplicationController; aop.j2ee.client.web.command.Command; aop.j2ee.client.web.command.LoginCommand; aop.j2ee.client.web.protocol.RequestContext; aop.j2ee.client.web.protocol.LoginRequestContext;

Be aware that too much data in the HttpSession could decrease performance of the servlet container as well, so this is not a silver bullet either Moreover, you cannot use this option with thick or Java SE clients..

So when you need to maintain state in your applications and your clients are Java SE clients, then the first two options we discussed earlier may be more difficult to implement. Hence, stateful session beans are probably the only viable option as long as you carefully weigh the performance considerations we outlined earlier. We ll close our discussion on session beans by outlining some best practices for session beans that you can use to build your application s business logic.

} private void saveReference( Helper helper ) { FileOutputStream ostream = null; ObjectOutputStream objStream = null; try{ ostream = new FileOutputStream( "Helper.obj" ); objStream = new ObjectOutputStream( ostream ); objStream.writeObject( helper.getHandle() ); objStream.flush(); objStream.close(); } catch(Exception e){ e.printStackTrace(); } } }

In this section we outline some of the best practices for session beans that you can use while building the business logic tier for your application. Choose your bean type carefully. Stateless session beans will be suitable most of the time. Carefully examine whether your application needs stateful session beans, because it comes with a price. If the EJB client lies in the web tier, then using HttpSession may be a better choice than stateful session beans under some circumstances. Carefully examine interface types for session beans. Remote interfaces involve network access and may slow down your applications. If the client will always be used within the same JVM as the bean, then use a local interface. If you are using DI, make sure you don t inject a stateful session bean into a stateless session bean or servlet. Injected EJB instances are stored in an instance variable and are available globally for subsequent clients even if a stateless bean instance is returned to the pool, and an injected stateful bean instance may contain inaccurate state information that will be available to a different client. It s legal to inject a stateful bean instance to another stateful session bean or an application client. Separate crosscutting concerns such as logging and auditing using business interceptors (which we discuss in chapter 5) instead of spreading them all over the business logic. Closely examine what kind of data you are storing in the conversation state. Try to use small, primitive instance variables in a stateful bean whenever possible as opposed to large nested composite objects. Don t forget to define remove methods in a stateful session bean. Tune passivation and timeout configurations to find the optimal values for your application.

// ApplicationController is an interface which defines process() public class LoginController implements ApplicationController { static final String USERBEAN_ATTR = "userbean"; static final String SUCCESS_VIEW = "/subscribe.html"; static final String FAILURE_VIEW = "/login.jsp"; public LoginController() {} // implemented by the aspect (implicit protocol) public void getRequestData(Object aBean, RequestContext aRequestContext) {} public Object process(RequestContext aRequestContext) throws Exception { Command logon = new LoginCommand();

Summary