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Raw video: YV12: YCrCb(4:2:0) RGBA: 32-bit Alpha RGB WMV1: Windows Media Video (WMV) 7 WMV2: Windows Media Video (WMV) 8

Figure 7-17. Update the Default front page to point to the new view. Now you re ready to edit the view!

EJB is obviously not a presentation layer technology. EJB is all about robust sup-

port for implementing the business logic and persistence layers. Figure 1.5 shows how EJB supports these layers via its services. In section 1.3 we ll go into more detail on EJB services. And in section 1.2 we ll explore EJB bean types. For now, just note that the bean types called session beans and message-driven beans (MDBs) reside in and use the services in the

WMV3: Windows Media Video (WMV) 9 WMVA: Windows Media Video Advanced Profile, non-VC-1 WVC1: Windows Media Video Advanced Profile, VC-1 H264 (ITU-T H.264 / ISO MPEG-4 AVC): H.264 and MP43 codecs. PlayReady DRM with MP4 (H264 and AAC-LC) Audio: WAV Microsoft Windows Media Audio v7, v8 and v9.x Standard (WMA Standard) Microsoft Windows Media Audio v9.x and v10 Professional (WMA Professional) ISO MPEG-1 Layer III (MP3) ISO Advanced Audio Coding (AAC)

Figure 1.5 The component services offered by EJB 3 at each supported application layer. Note that each service is independent of the other, so you are for the most part free to pick the features important for your application. You ll learn more about services in section 1.3.

A WYSIWYG editor allows people to create web-friendly text in a browser It allows you to write text and apply HTML markup to the text you write, such as changing the font size and font color, displaying icons, and more You most likely use an HTML editor when you write e-mails if you use a web-based service for email, such as Gmail, Hotmail/Live, or Yahoo! The best module to use to install a WYSIWYG editor is the (drumroll, please) Wysiwyg module (http://drupalorg/project/wysiwyg) This module allows you to install any of a number of WYSIWYG editors, including TinyMCE, CKEditor, YUI (Yahoo!), and more WYSIWYG editors also allow you to embed images and videos from third-party sources such as Flickr and YouTube If you want to upload images and videos to your own server using a WYSIWYG editor, I recommend using the IMCE module (http://drupal.

In this chapter, I compare the pros and cons of using Silverlight instead of Flash for video and then I show you how to build a very cool, interactive Silverlight video player.

business logic tier, and the bean types called entities reside in and use services in the persistence tier. The traditional four-tier layered architecture is not perfect. One of the most common criticisms is that it undermines the OO ideal of modeling the business domain as objects that encapsulate both data and behavior. Because the traditional architecture focuses on modeling business processes instead of the domain, the business logic tier tends to look more like a database-driven procedural application than an OO one. Since persistence-tier components are simple data holders, they look a lot like database record definitions rather than first-class citizens of the OO world. As you ll see in the next section, DDD proposes an alternative architecture that attempts to solve these perceived problems. Domain-driven design The term domain-driven design (DDD) may be relatively new but the concept is not (see Domain-Driven Design: Tackling Complexity in the Heart of Software, by Eric Evans [Addison-Wesley Professional, 2003]). DDD emphasizes that domain objects should contain business logic and should not just be a dumb replica of database records. Domain objects are known as entities in EJB 3 (see section 1.2 for a discussion on entities). With DDD, the Catalog and Customer objects in a trading application are typical examples of entities, and they may contain business logic. In his excellent book POJOs in Action (Manning, 2006), author Chris Richardson points out the problem in using domain objects just as a data holder.

Some developers still view persistent objects simply as a means to get data in and out of the database and write procedural business logic. They develop what Fowler calls an anemic domain model .... Just as anemic blood lacks vitality, anemic object models only superficially model the problem and consist of classes that implement little or no behavior.