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@Stateless public PlaceBidBean implements PlaceBid { ... @EJB public BidLocalHome bidLocalHome; ... BidLocal bidLocal = bidLocalHome.create(BidDTO); ... }

Design patterns can therefore have a huge impact on the structure of an application and may compromise the original object model While it is easy to recognize a singleton simply by reading the code, other design patterns such as the Command design pattern are more difficult to identify Although design patterns are reusable in the sense that they structure the code, their implementation usually contains elements that are specific to a particular context, and the code itself is therefore less reusable..

In this example, we create a bean instance (BidDTO) by using a data transfer object (DTO). We ll discuss the DTO design pattern in section 14.3, but essentially the

application tiers. Recall that creating an entity bean instance will ask the container to persist the bean instance in the database. That covers calling EJB 2 from EJB 3, but what about the other way around Read the next section to solve this mind-numbing mystery actually, there s nothing mind-numbing about it it s almost as simple as what we just covered. Go ahead see for yourself.

and store data. The application server running the EJB application provides data sources as specified by the deployer.

You can use both EJB 3 session beans and the EJB 3 JPA from EJB 2 applications. Although there were some discussions in the EJB 3 Expert Group on adding support for dependency injection for EJB 2 style beans, the EJB 3 spec does not require support for injection with EJB 2 (although some vendors may decide to provide it). If your server does not support EJB 2 dependency injection, you must use good old-fashioned JNDI lookup to access EJB 3 session beans and the EJB 3 EntityManager from EJB 2 beans. This is shown in figure 14.1.

This section presents two implementations of the Singleton design pattern, one with JBoss AOP, and one with AspectJ. As we saw in the previous example, the main issue preventing better modularization was the fact that classes had to call the method getInstance rather than the usual constructor. JBoss AOP and AspectJ allow you to solve the problem simply and effectively by defining an aspect to modify the behavior of the constructor, which is invoked by the new operator to

Figure 14.1 It is possible to use EJB 3 beans as well as the JPA EntityManager in EJB 2 by looking them up from the JNDI context.

To retrieve the javax.sql.DataSource object from the application server, you must complete two steps. First, you must configure the deployment descriptor for the bean that will need access to the DataSource object. Listing 3.1 shows the partial XML from a deployment descriptor file for the SampleDataSourceBean bean.

The method is similar to using EJB 3 beans or JPA using JNDI lookup (which we discussed in chapter 12). Using EJB 3 session beans from EJB 2 Pretend for a moment that the PlaceBid EJB is an EJB 2 session bean that invokes CheckCredit in a partner application, KabadiBazaar, but that CheckCredit is an EJB 3 session bean. You must have an ejb-ref or ejb-local-ref element in the ejb-jar.xml to establish the reference to the CheckCredit EJB as follows:

<session> <ejb-name>PlaceBidBean</ejb-name> <home>actionbazaar.buslogic.PlaceBidHome</home> <remote>actionbazaar.buslogic.PlaceBid</remote> <ejb-class>actionbazaar.buslogic.PlaceBidBean</ejb-class> <session-type>stateless</session-type> ... <ejb-local-ref> <ejb-ref-name>ejb/CheckCredit</ejb-ref-name> <ejb-ref-type>Session</ejb-ref-type> <local>kabadibazaar.buslogic.CheckCredit</local> <ejb-link>kabadibazaar-ejb.jar#CheckCreditBean</ejb-link> </ejb-local-ref> </session>

<ejb-jar> <enterprise-beans> <session> <ejb-name>SampleDataSourceBean</ejb-name> <home>sample.SampleDataSourceHome</home> <remote>sample.SampleDataSource</remote> <ejb-class>sample.SampleDataSourceBean</ejb-class> <session-type>Stateless</session-type> <resource-ref> <res-ref-name>ejbBookDataSource</res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth> </resource-ref> </session> </enterprise-beans> <assembly-descriptor> </assembly-descriptor> </ejb-jar>