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At this point, let s launch our detailed exploration with the simpler stateless session bean model and save stateful session beans for later.

Figure 7-30. Visual Studio implemented the abstract class for you. This is the method that needs to be overridden for a Behavior. We could use this to add our MouseLeftButtonDown and MouseLeftButtonUp. But instead we are just going to delete the default code, as I do here: protected override void Invoke(object parameter) { }

Figure 7-11. You must click the Override button when making changes to a view if you want the settings to be specific to a page, block, or feed display; otherwise, you will change only the default display values. Each individual display has three columns of information, with each column containing a number of categorized settings for the individual view. Each settings category has several pieces of information; all have links, and some have gear icons. Clicking a link or an icon opens an additional form at the bottom of the screen to which you can make configuration changes. If there is an icon, the link is used to select the main setting (that is, plug-in, pager type, and so on), and the icon is used to configure settings within each main setting. Referring to Figure 7-9, selecting the Unformatted link next to Style in the Style se ttings category opens the dialog box shown in Figure 7-12 underneath the main view area. After you have selected the style plug-in and clicked Update, the icon is used to configure the selected plug-in s settings.

As noted earlier, stateless session beans model tasks don t maintain conversational state. This means that session beans model tasks can be completed in a single method call, such as placing a bid. However, this does not mean that all stateless session beans contain a single method, as is the case for the PlaceBidBean in chapter 2. In fact, real-world stateless session beans often contain several closely related business methods, like the BidManager bean we ll introduce soon. By and large, stateless session beans are the most popular kind of session beans. They are also the most performance efficient. To understand why, take a look at figure 3.3, which shows a high-level schematic of how stateless session beans are typically used by clients. As you ll learn in section 3.2.4, stateless beans are pooled. This means that for each managed bean, the container keeps a certain number of instances handy in a pool. For each client request, an instance from the pool is quickly assigned to the client. When the client request finishes, the instance is returned to the pool for reuse. This means that a small number of bean instances can service a relatively large number of clients. In this section you ll learn more about developing stateless session beans. We ll develop part of the business logic of our ActionBazaar system using a stateless session to illustrate its use. You ll learn how to use @Stateless annotations as well as various types of business interfaces and lifecycle callbacks supported with stateless session beans.

Figure 3.3 Stateless session bean instances can be pooled and may be shared between clients. When a client invokes a method in a stateless session bean, the container either creates a new instance in the bean pool for the client or assigns one from the bean pool. The instance is returned to the pool after use.

have done in the following bold code:

Before we jump into analyzing code, let s briefly discuss the ActionBazaar business logic that we ll implement as a stateless session bean.