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The webform module allows you to create an individualized form per node. That is, you can create a form to collect e-mail addresses, uploaded files, radio buttons, check boxes, and so on, where each node has a different set of fields to collect data. Furthermore, each form has a number of included features, such as reporting and data export. There are a number of differences between the webform module and other methods used to collect data in Drupal. One of the main differences is that web form submissions are not saved as nodes. If you create a content type and add fields to the content type to collect user-submitted data, all submissions are saved as a node and can be accessed at /node/[nid] by users with the proper permissions. This is not so with web forms; data is saved in a table and can be accessed only by using the webform module. This has its pros and cons; webform makes it very easy to collect, store, and retrieve data. However, data is not nodes and does not have the functionality associated with nodes, such as commenting, workflows, and ease of integration with other Drupal modules. When do you use the webform module instead of creating a content type Here are a few rules of thumb I tend to follow:

Your Solution Explorer should look the one shown in Figure 8-5.

@EJB(name="BidManagerRemote") private BidManager bidManager;

For the most part, using DI is a no-brainer. There are a few nuances to keep an eye on while using DI with stateful beans, though. You can inject a stateful session into another stateful session bean instance if you need to. For example, you can inject

Figure 8-5. After you ve added your thumbnails, Solution Explorer should look something like this. With the videos and thumbnails included in the application, you need to create the XML that tells the application where to find these assets. Let s do that now:

the BidderAccountCreator stateful EJB from UserAccountRegistration EJB that is another stateful session bean as follows:

The webform module is preferred when you need to save data and plan to export data to Excel or another third-party application. The core contact module is preferred over the webform module if you require a single contact form that can be directed to more than one person. The core poll module is preferred over the webform module if you want to give users the ability to see voting statistics immediately after they vote. Content types are preferred when you want each submission to be accessible by navigating to /node/[nid]. Content types are preferred when you want to do something with data, such as displaying it in a view or sending it to a user for review. Content types are preferred when you want the flexibility of using Drupal s core fields or contributed field modules.

@Stateful public class UserAccountRegistrationBean implements UserAccountRegistration { @EJB private BidderAccountCreator bidderAccountCreator; ... }

5. In the SLVideoPlayer01.Web project, right-click ClientBin and click Add New Item. 6. In the Add New Item dialog box, select Data for the Installed Templates. 7. Select XML File for the file type. 8. Name the new XML file videodata.xml. 9. Select Add, as shown in Figure 8-6.

This code will create an instance of BidderAccountCreatorBean which will be specifically meant for the client accessing the instance of the UserAccountRegistrationBean. If the client removes the instance of UserAccountRegistrationBean, the associated instance of BidderAccountCreatorBean will also be automatically removed. Keep in mind that you must not inject a stateful session bean into a stateless object, such as a stateless session bean or servlet that may be shared by multiple concurrent clients (you should use JNDI in such cases instead). However, injecting an instance of a stateless session bean into a stateful session bean is perfectly legal. 12 discusses in much greater detail how you can use EJB from other tiers. This concludes our brief discussion on accessing session beans. Next, we ll briefly explore potential performance issues of stateful session beans.

Whether or not they deserve it, stateful session beans have received a bad rap as performance bottlenecks. There is truth behind this perception, quite possibly due to poor initial implementations for most popular application servers. In recent years, these problems have been greatly alleviated with effective underthe-hood optimizations as well as better JVM implementations. However, you still have to keep a few things in mind in order to use session beans effectively. More or less, these techniques are essential for using any stateful technology, so pay attention even if you decide against using stateful beans. In this section you ll learn techniques to effectively use stateful session beans and other alternatives for building stateful applications.

Content types can also be webform-enabled, allowing you to attach a unique web form to every node of a specific content type. This can be beneficial if, for example, you want to create a customized Contact Us form for each node of a specific content type. For example, you may have an automobile content type and, at the bottom of each automobile node, want to include a form that salespeople can customize.

Your videodata.xml file must be located in the ClientBin directory of your SLVideoPlayer01.Web project or it will not be located correctly.