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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).
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If you are interested in learning more about Ajax, check out the following resources:
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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)
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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.
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12.1.2 Using the Entity Access Object pattern
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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
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Effectively integrating EJB 3 across your application tiers
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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.
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NOTE
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.
Introducing the Entity Access Object pattern 9 demonstrated how to use the EntityManager API directly from the business logic in a session bean. The problem with this approach is that entity access code gets sprinkled throughout the business logic, which is a maintenance nightmare. The Entity Access Object (EAO) pattern decouples the entity access logic from the business logic and improves code maintainability. It allows you to easily change your underlying entity access code without affecting the business logic. If you implement the EAO pattern in your applications, it is significantly easier to change your persistence-tier mechanism from JDBC, EJB 2 CMP, or some proprietary persistence mechanism to JPA. You can learn more about data access objects from Sun s blueprints website (http://java.sun.com/blueprints/corej2eepatterns/Patterns/DataAccessObject. html). Just replace all references to DAO with EAO, and references to transfer objects with entities. The EAO pattern abstracts data access code, for example, using JPA from the business logic code. Usually you have one EAO object for every domain object (entity) that performs the CRUD operations for the domain objects (entities). Figure 12.1 shows the class diagram of the EAO defined for the Bid entity of the ActionBazaar system. As shown in figure 12.1, BidEAO is the entity access object that manipulates the Bid entity. A business object such as the PlaceBid EJB will persist and retrieve instances of the Bid entity by using BidEAO. It hides from the PlaceBid EJB the actual persistence mechanism used to store the entity. Now let s explore how to implement an entity access object for the Bid entity.
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