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The Workflow module (http://drupal.org/project/workflow) is a great solution for creating content publishing workflows. It allows you to create and assign workflows and workflow states to node types. For example, you can assign a workflow with the states Draft, Review, Revise, and Publish to a blog node type. Furthermore, actions can be assigned to changes between workflow states so that an e-mail is sent to users when a blog is moved from Draft to Review or a node is published when a blog is moved from Review to Publish. You have fine-tuned control over which user roles have permission to move a node between states; this means you can create two user groups, such as editor and publisher, and give permissions only to publishers to move a node from Review to Publish. The Workflow module is currently being ported to Drupal 7; navigate to http://drupal.org/node/ 732578 to track its current status.

2. Draw a Rectangle in the workspace, as shown in Figure 2-14.

This code looks much simpler than the earlier code and is easier to maintain. The code that uses the EAOs is simpler too:

@Stateless public class PlaceBidBean implements PlaceBid { @EJB private BidEAO bidEAO; public Long addBid(String userId, Long itemId, Double bidPrice) throws BidException { ... Bid bid = bidEAO.addBid(item, userId, bidPrice); return bid.getBidId(); } }

3. Activate the Selection tool (by pressing the V key) and click the Rectangle to select it. 4. In the Brushes section of the Properties panel, click the Fill property, as shown in Figure 2-15.

Implementing EAOs using session beans looks lean and mean. Some purists will resent you considering this approach, but we recommend that you seriously contemplate it because, as a side effect of using session beans for your EAOs, you automatically receive declarative transactions and a container-managed EntityManager. That s nothing to sneeze at! We ll discuss how the Spring framework uses the JpaTemplate to provide EAO support in chapter 16, when we discuss JPA with Spring applications. But now, let s review the Session Fa ade pattern.

Fields, which are added to content types, user profiles, and comments, are rather simple in their current form; you can add text or file uploads. A number of modules are available that expand upon this functionality, giving you the ability to control how users enter and format field data, including date fields, phone fields, and more.

One of the primary reasons the Session Fa ade pattern was invented was to reduce the number of remote calls for previous EJB incarnations, and this still holds true for EJB 3. In EJB 2 entity beans were remotely accessible by the clients. However, the remoteness comes at a price namely reduced performance and tight coupling of clients with domain data. With a session bean fa ade, you can

5. With the Fill property selected, click the Gradient brush button, as shown in Figure 2-16.

Figure 12.2 The Session Fa ade design pattern. Client applications may need to access entities or business logic remotely. JPA entities are POJOs and cannot be accessed remotely. You can use a session bean as a fa ade to the entities and consolidate the logic to manipulate entities in the session fa ade. Then, using other beans, you can let the clients access the session fa ade. A coarsegrained session fa ade also becomes a good candidate for being exposed as a web service.