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The good news is that EJB 3 enables you to easily follow good object-oriented design or DDD. The entities defined by EJB 3 Java Persistence API (JPA) support OO features, such as inheritance or polymorphism. It s easy to implement a persistence object model with the EJB 3 JPA. More importantly, you can easily add business logic to your entities, so that implementing a rich domain model with EJB 3 is a trivial task. Note, though, that many people don t like adding complex business logic in the domain object itself and prefer creating a layer for procedural logic referred to as the service layer or application layer (see Patterns of Enterprise Application Architecture, by Martin Fowler [Addison-Wesley Professional, 2002]). The application layer is similar to the business logic layer of the traditional four-tier architecture, but is much thinner. Not surprisingly, you can use session beans to build the service layer. Whether you use the traditional four-tier architecture or a layered architecture with DDD, you can use entities to model domain objects, including modeling state and behavior. We ll discuss domain modeling with JPA entities in chapter 7. Despite its impressive services and vision, EJB 3 is not the only act in town. You can combine various technologies to more or less match EJB services and infrastructure. For example, you could use Spring with other open source technologies such as Hibernate and AspectJ to build your application, so why choose EJB 3 Glad you asked...

Specifying stateful bean business interfaces works in almost exactly the same way as it does for stateless beans with a couple of exceptions. Stateful session beans support local and remote invocation through the @Local and @Remote annotations. However, a stateful session bean cannot have a web service endpoint interface. This is because SOAP-based web services are inherently stateless in nature. Also, you should always include at least one @Remove annotated method in your stateful bean s business interface. The reason for this will become clear as we discuss the stateful bean lifecycle next.

Silverlight has more format choices. In addition to native support for VC-1/WMA, Silverlight 3 now offers users native support for MPEG-4 based H.264/AAC audio, enabling content distributors to deliver high-quality content to a wide variety of computers and devices. Silverlight has extensible media format support: With the new Raw AV pipeline, Silverlight can easily support a wide variety of third-party codecs. Audio and video can be decoded outside the runtime and rendered in Silverlight, extending format support beyond the native codecs. Silverlight has industry-leading content protection. Silverlight s DRM, powered by PlayReady Content Protection, enables protected in-browser experiences using Advances Encryption Standard (AES) encryption or Windows Media DRM.

As we mentioned in section 3.1, the lifecycle of the stateful session bean is very different from that of a stateless session bean because of passivation. In this section, we explain this concept in more depth. Let s start by looking at the lifecycle of a stateful bean, as shown in figure 3.8. The container follows these steps:

Figure 7-18. Install the appropriate editor in a directory called libraries, which is located in the sites/all directory.

Always creates new bean instances using the default constructor whenever a new client session is started.

And these are some advantages to using Flash for video:

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Injects resources. Stores the instance in memory. Executes the requested business method invoked through the business interface by the client. Waits for and executes subsequent client requests. If the client remains idle for a period of time, the container passivates the bean instance. Essentially, passivation means that the bean is moved out of active memory, serialized, and stored in temporary storage. If the client invokes a passivated bean, it is activated (brought back into memory from temporary storage). If the client does not invoke a passivated bean instance for a period of time, it is destroyed. If the client requests the removal of a bean instance, it is first activated if necessary and then destroyed.

Nearly all web users have the Flash Player plug-in. Flash video requires much less CPU power, so it runs better on older machines and mobile phones. The Flash video encoder supports a wide range of video and animation formats that can be encoded into the FLV format. Here is a list of supported video and animation formats: Mobile Video (3G2) GIF (animated GIF) DLX (Sony VDU File Format Importer, Windows only) DV (in a MOV or AVI container or as a containerless DV stream) Flash Video (FLV, F4V) M2T (Sony HDV) MOV (QuickTime; in Windows, requires the QuickTime player) MP4 (XDCAM EX) MPEG-1, MPEG-2, and MPEG-4 formats (MPEG, MPE, MPG, M2V, MPA, MP2, M2A, MPV, M2P, M2T, AC3, MP4, M4V, M4A) MTS (AVCHD) Media eXchange Format (MXF) Netshow (ASF, Windows only) QuickTime (MOV; 16 bpc, requires QuickTime) Video for Windows (AVI, WAV; requires QuickTime on Mac OS) WMV (WMV, WMA, ASF; Windows only)