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The application logic layer The application logic layer (known as the business logic layer to business application developers) refers to the components responsible for implementing the functionality of an application These components must manage the application s data and state while performing the specific operations supported by the application In J2EE, application logic is usually implemented by Enterprise JavaBeans (EJB) running in the J2EE EJB container Components at this layer implement the resource-intensive, often transactional portion of your application Challenges at this layer involve ensuring correct behavior and data integrity, interactions between system components, error handling, and performance optimization Building a flexible, high performance application logic layer is quite challenging We examine the ways in which XML might help J2EE developers do this in chapter 3 The application data layer This layer refers to the components that manage an application s own, internal data.

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Now is a good time to walk through the code that authentication and authorization in more detail. As you go through this section, you may want to download the Microsoft Visual Studio development system solution for the Tailspin Surveys application from http://wag. codeplex.com/. The diagram in Figure 6 will be useful to help you keep track of how this process works as you look at the detailed description and code samples later in this chapter.

If you move the mouse pointer smoothly beneath a set of clips stationed on the Video track, you ll notice that the insertion pointer pauses briefly each time you come to a clip boundary . This behavior is designed to help you align sound clips with video clips .

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Clips on the Audio/Music track are not anchored to the video clips with which they re aligned . If the video clips moves (for example, because you insert another video clip or trim a clip), you ll have to realign your sound and video . To avoid frustration, get all your visual blocks in place, and then add sound .

If you have a microphone connected to your computer, you can play back all or portions of a project and record a narration to accompany what you see. Follow these steps: 1. Display the timeline and make sure that the Audio/Music track is visible. 2. Position the playback pointer (the blue bar that runs through all five tracks) where you want to begin your narration. (The Audio/Music track must be vacant at this place; you cannot record a narration over an existing audio/music clip.) 3. Choose Tools, Narrate Timeline (or click the Narrate Timeline tool on the Timeline toolbar). 4. In the Narrate Timeline window that appears, make sure that the Audio Device option is set correctly.

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In J2EE, these data are typically under the direct control of a relational database management system (RDBMS) like Oracle Enterprise Server or IBM DB/2 J2EE now mandates the presence of an RDBMS in its server environment In some situations, you may not need to write components to directly interact with a data store If all your data-aware objects are EJB Entity Beans that employ Container Managed Persistence (CMP), the EJB container handles all database interaction on your behalf This, of course, comes at the price of extra configuration and a loss of flexibility in your data and/or object models..

5. Speak into your microphone at the volume level and distance you re comfortable with; adjust either the Input Level setting, your volume level, or your position relative to the microphone if the meter is going into the red zone or not getting off the floor.

If you have other sound clips on the Audio/Music track to the right of your current position, select Limit Narration To Available Free Space on Audio/ Music Track. (Otherwise, if your narration goes on too long, subsequent objects will be moved to the right while you speak.) If the video that you re about to narrate has much sound of its own, select Mute Speakers (or turn your speakers off). Otherwise, your microphone will pick up some of that sound along with your voice as you narrate.

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