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Note we have omitted the cancelBid bean method from the interface; we don t want this functionality to be accessible via a web service, although it is accessible locally as well as remotely through RMI. The @WebService annotation doesn t place any special restrictions on either the interface or the implementing bean. We discuss EJB web services in greater detail in chapter 15. Working with multiple business interfaces Although it is tempting, you cannot mark the same interface with more than one access type annotation. For example, you cannot mark the BidManager interface in listing 3.1 with both the @Local and @Remote annotations instead of creating separate BidManagerLocal (local) and BidManager (remote) interfaces, although both interfaces expose the exact same bean methods. However, a business interface can extend another interface, and you can remove code duplication by creating a business interface that has common methods and business interfaces that extend the common parent interface. For example, you can create a set of interfaces utilizing OO inheritance as follows:

will prevent linking to content displayed by the view Caching allows you to cache the results of the views query, allowing you to boost performance on a production site Query settings allow you to configure advanced MySQL settings, which are beyond the scope of this book If you are interested in learning more, check out http://devmysqlcom/ doc/refman/50/en/distinct-optimizationhtml to learn about the distinct command, and check out http://apidrupalorg/api/function/hook_db_rewrite_sql/6 to learn about disabling SQL rewriting Style settings allow you to configure and customize how the view is styled when output By default, the views module comes with five styles: Unformatted, Grid, HTML List, Jump menu, and table Many other modules add additional style plug-ins, including calendars, slideshows, pop-ups, and more Many of these are discussed in Appendix B.

public interface BidManager{ void addBid(Bid bid); List<Bid> getBids(Item item); } @Local public interface BidManagerLocal extends BidManager { void cancelBid(Bid bid); } @Remote public interface BidManagerRemote extends BidManagerLocal { } @WebService public interface BidManagerWS extends BidManager { }

you have what I have in Figure 7-33.

If you want, you can apply the @Local, @Remote, or @WebService annotation in the bean class without having to implement the business interface as follows:

@Entity @Table(name="USERS") @Inheritance(strategy=InheritanceType.TABLE_PER_CLASS) public class User { Inheritance ... strategy @Entity @Table(name="SELLERS") public class Seller extends User { ... @Entity @Table(name="BIDDERS") public class Bidder extends User {

Figure 7-33. Your Objects and Timeline panel should now have the FillBehavior under the [Rectangle].

Row style allows you to change how data is output; by default, rows can be output as either fields or nodes If fields is selected, you will need to add fields to display, as discussed in the next section CSS class allows you to add a class to the individual view, used primarily for theming Theme: information presents a list of theme templates available to override the views module s theme templates and is covered in the next chapter When building the logic behind a view (covered in a later section), one setting category is called Filters, which allows you to restrict the list of results based on a number of values, such as the time a node was created or the number of comments When creating filters, you can also expose them to end users so they can limit results manually.

As you can see, the inheritance strategy C is specified in the superclass entity, User. However, all of the concrete entities in the OO hierarchy are mapped to separate tables and each have a @Table specification B. The greatest disadvantage of using this mapping type is that it does not have good support for polymorphic relations or queries because each subclass is mapped to its own table.

The limitation is that when you want to retrieve entities over the persistence provider, you must use SQL UNION or retrieve each entity with separate SQL for each subclass in the hierarchy. Besides being awkward, this strategy is the hardest for an EJB 3 provider to implement reliably. As a result, implementing this strategy has been made optional for the provider by the EJB 3 specification. We recommend that you avoid this strategy altogether. This completes our analysis of the three strategies for mapping OO inheritance. Choosing the right strategy is not as straightforward as you might think. Table 8.2 compares each strategy. The single-table strategy is relatively simple and is fairly performance friendly since it avoids joins under the hood. Even inserts and updates in the single-table strategy perform better when compared to the joined-tables strategy. This is because in the joined-tables strategy, both the parent and child tables need to be modified for a given entity subclass. However, as we mentioned, the single-table