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Although not required, I recommend configuring an input format specifically for the WYSIWYG editor. Navigate to Configuration Tex t formats to add a format, as shown in Figure 7-19. This allows you to easily assign permissions to roles so that one role can access a limited version editor while another role can access a full version.

Figure 3.8 The lifecycle of a stateful session bean. A stateful bean maintains client state and cannot be pooled. It may be passivated when the client is not using it and must be activated when the client needs it again.

So what does this all mean Basically, it means that you, as the developer, must decide what tool you need given the requirement of the RIA you are developing. In some cases, the tool will be Silverlight, and in others, it will be Flash.

Like a stateless session bean, the stateful session bean has lifecycle callback methods, or callbacks, that are invoked when the PostConstruct event occurs (as an instance is created) and when the PreDestroy event occurs (before the instance is destroyed). But now we have two new callback events for which we can have callbacks: PrePassivate and PostActivate, which are part of the passivation process. We ll discuss them next. Just as in listing 3.1, we use a PostConstruct callback in listing 3.2 to open a database connection from the injected data source so that it can be used by business methods. Also as in listing 3.1, we close the cached connection in preparation for bean destruction in a PreDestroy callback. However, you should note that we invoke the very same method for both the PreDestroy and PrePassivate callbacks:

@PrePassivate @PreDestroy public void cleanup() { ... }

Figure 7-19. Navigate to Configuration Tex t formats to add a format. Note that one of the benefits of the WYSIWYG module is that the editor is tied to a specific filter, which you cannot do with standalone editors. This means you can have different filter settings per editor, so that a user with an administrator role can have different filters than an anonymous user. This is ideal when you want to limit the functionality of an anonymous user s WYSIWYG editor but give administrators full functionality. 4. Return to the Configuration Wysiwyg profiles page, which has now changed. If you added an INPUT FORMAT, it will also appear in the list, as shown in Figure 7-20.

In staying with my philosophy that the best way to learn is by hands-on experience, I am now going to show you how to build a fun, interactive Silverlight video player. I have decided that this particular application would be a good place to show you how to do some very cool things in Silverlight, such as the following:

Similarly, the exact same action is taken for both the PostConstruct and PostActivate callbacks:

@PostConstruct @PostActivate public void openConnection() { ... }

Using XML for data Making UI objects draggable using the MouseDragElementBehavior Behavior Creating a singleton DataFactory Making UI objects react when other UI objects are dropped on them

To see why this is the case, let s discuss activation and passivation in a little more detail. Passivation and activation If clients don t invoke a bean for a long enough time, it is not a good idea to continue keeping it in memory. For a large number of beans, this could easily make the machine run out of memory. The container employs the technique of passivation to save memory when possible.

By default, no editors are assigned to an input format. If you added a text format (aka INPUT FORMAT), select the editor you just installed to be used, and save; this editor will be used when the format is selected during content creation, as shown in Figure 7-21.

Passivation essentially means saving a bean instance into disk instead of holding it in memory. The container accomplishes this task by serializing the entire bean instance and moving it into permanent storage like a file or the database. Activation is the opposite of passivation and is done when the bean instance is needed again. The container activates a bean instance by retrieving it from permanent storage, deserializing it, and moving it back into memory. This means that all bean instance