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Figure 11-2. Declarative transactions mechanism in J2EE The existence of container-managed transactions allows the program s code to remain free from the transaction concern. However, this technique has its limitations. The attributes defined by the EJB standard are too simple to cover all the possible cases that can arise when developing complex applications. For instance, the programmer may need to retry a transaction if it did not complete successfully in the first place. It is also common to optimize the application by not applying a transaction within some contexts, which depends on the application or environment state. Nevertheless, when it comes to optimization, it is sometimes useful to limit the transaction application scope to an instruction group rather than to the whole method code. In this case, the only way is to use the TX_BEAN_MANAGED attribute and to manually code the transactional logic. Even in the cases when the provided attributes allow the description of the transactional logic, this technique still requires some code to be written in order to handle the client-side exceptions and some rollback management cases. In particular, the programmer may need to force the rollback of a transaction within a participant. In this case, the setRollbackOnly method shall be used (see line 7 of Listing 11-21) in order to cancel the transaction, even if higher-level participants try to commit the transaction. As an example, the code in Listing 11-21 prevents a negative setBalance from occurring in any transactional context:

Does this pattern sound familiar That s right it s identical to the Ajax examples you ve been working with throughout the book The XMLHttpRequest object is the perfect client for REST-based Web Services Using the XMLHttpRequest object, you can asynchronously send a request to a Web Service and parse the resulting XML response In the case of Yahoo! Web Services, the XMLHttpRequest object can send a request to Yahoo! to search for a specified term Once Yahoo! returns a response, JavaScript DOM methods parse the response and dynamically render the result data to the page Listing 4-15 demonstrates how to use Ajax techniques to access Yahoo! Web Services and render the results to the page The text field on the page allows the user to specify the term on which to perform the search The select box enables the user to specify how many results to display.

The XML document is where all the information about the project is kept. This includes pointers to embedded fonts, audio, images, and anything else pertaining to the project including the layering order and the contents of the layers.

If you create an uncompressed XFL file or are handed the XFL folder, make sure that you always work in that folder and that you don t, for obvious reasons, delete or remove any files used in the project from the folder.

How to customize your Flash workspace A number of methods of manipulating objects on the Flash stage How to dock, undock, and minimize panels The importance of the Properties panel in your daily workflow The difference between a frame and a keyframe The process involved in using frames to arrange and animate content and the properties of content on the stage using the Motion Editor How to add, delete, nest, and rearrange layers How to test a Flash movie How to create an uncompressed XFL document That s a lot of stuff you ve learned by taking a casual stroll through Flash Professional CS5. In the next chapter, you ll learn how to use the tools to create content in your movies and how Fireworks CS5, Photoshop C4, and Illustrator CS5 are important elements in your workflow.

Listing 11-21. An Example of Use for the setRollbackOnly Method 01 02 03 04 05 06 07 08 09 10 11 [...] public void setBalance(double amount) throw InsufficientFundsException { if( balance >= 0 ) { balance = amount; } else { context.setRollbackOnly(); throw new InsufficientFundsException(balance); } } [...]

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In the previous chapter, we handed you a bunch of images and essentially said, Here, you toss them on the stage. In this chapter, you ll dig into how those objects were created, and in fact, you are going to be drawing trees, drawing the moon, creating Venetian blinds, and playing with Chinese dancers and T-shirts, among other things. You will be looking at the new Illustrator and Photoshop file importers and also playing with JPEG and GIF images. There s a lot to cover. Let s get started. What we ll cover in this chapter: Flash graphic fundamentals Using the drawing tools Managing and working with color Working with fills, strokes, and gradients Tracing bitmap images Image file formats and Flash Importing Illustrator documents into Flash Importing Photoshop documents into Flash If you haven t already, download the chapter files. You can find them at www.friendsofED.com/ download.html isbn=1430229940.

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