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The EJB bean class Just like typical OO programming, each interface that the bean intends to support must be explicitly included in the bean implementation class s implements clause. We can see this in the code for the PlaceBidBean from chapter 2:

This solution creates a batch process that executes only once. You could, however, change the creation of the timer to execute repeatedly (instead of only once). See recipe 4.6 for the specifics of the EJB timer service. By timing the batch process to run at off-peak hours, you are safe from tying up resources that are needed by actual users. When you re developing a mechanism like this one, your business logic would be located in the ejbTimeout() method. This is the method that is executed when the timer expires. If you use a repeating timer, this method is also

@Stateless public class PlaceBidBean implements PlaceBid { ... public PlaceBidBean() {} public Bid addBid(Bid bid) { System.out.println("Adding bid, bidder ID=" + bid.getBidderID() + ", item ID=" + bid.getItemID() + ", bid amount=" + bid.getBidAmount() + "."); return save(bid); } ... }

Once the use case code has been identified, we will define the transfer object that aggregates the needed data. Since this object will be used by the aspects, it can be useful to define it in a different package than the transfer objects that are explicitly used by the business layer (located in aop.j2ee.commons.to). In Listing 12-9, the CustomerAndAccountInfos class defines a transfer object that gathers all the needed data. Listing 12-9. The CustomerAndAccountInfos Transfer Object package aop.j2ee.commons.aspect.to; import java.math.BigDecimal; import java.util.Date; import java.io.Serializable; public class CustomerAndAccountInfos implements Serializable { private private private private private private private private private private private private private private private String type; String description; BigDecimal balance; BigDecimal creditLine; BigDecimal beginBalance; Date beginBalanceTimeStamp; String lastName; String firstName; String middleInitial; String street; String city; String state; String zip; String phone; String email;

The PlaceBidBean class provides the concrete implementation of the addBid method required by the PlaceBid interface. Session bean implementation classes can never be abstract, which means that all methods mandated by declared business interfaces must be implemented in the class. Note that EJB implementation classes can have nonprivate methods that are not accessible through any interface. Such methods can be useful for creating clever unit-testing frameworks and while implementing lifecycle callback, as you ll learn in section 3.2.5. Also, an EJB bean class can make use of OO inheritance. You could use this strategy to support a custom framework for your application. For example, you could put commonly used logic in a parent POJO class that a set of beans inherits from.

invoked repeatedly. Management consoles (or your client application) can look up the entity beans that represent the batch status using the batch name. Another factor to consider when developing a batch system like this one is your ability to encapsulate business logic from the ejbTimeout() method. This way, when your batch business logic changes (its code), your batch system does not need to also change. Recipe 4.11 presents an example of insulating your EJBs from the business logic.

It is clear that session beans are POJOs. Since EJB annotations are ignored by the JVM, session beans can be unit-tested using a framework like JUnit or TestNG without having to deploy them into an EJB container. For more information on JUnit, browse www.junit.org. On the other hand, since several container-provided services such as dependency injection cannot be used outside the container, you cannot perform functional testing of applications using EJBs outside the container at least not easily.

Now that we ve looked at the basic structure of session beans, we ll outline relatively simple programming rules for a session bean.

public CustomerAndAccountInfos() {} public String getDescription() {return description;} public String getType() {return type;} [...] public void setType(String type) {this.type = type;} public void setDescription(String description) { this.description = description; } [...] }

4.9 Creating asynchronous behavior for an EJB client 4.10 Creating asynchronous behavior without message-driven beans 4.11 Insulating an EJB from service class implementations

3.1.3 Understanding the programming rules Like all EJB 3 beans, session beans are POJOs that follow a small set of rules. The following summarizes the rules that apply to all types of session beans: