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In this case, the phone is held on its side for a horizontally framed photo, but you can take photos vertically, too. Unlike with some apps, the position of the buttons on the screen will not change as you rotate the phone orientation. On the right side of the screen, you ll see a small preview of the last photo you took, a slider to slide from video to still-photography mode, and a shutter button to take the photo. On the left, you ll see visual indications about your camera settings. In Figure 9 1, the photo is set to allow geotagging, and the flash is set to be automatically triggered in

If we extract the inlined code into the OrderRequestHandler class, then the code s business logic is decoupled from asynchronous messages The OrderRequestHandler class is solely responsible for the order fulfillment process: recording an order, submitting the order to the legacy order fulfillment application, and notifying order status subscribers In addition, the business logic easily can be tested outside the MDB container, completely separate from JMS technology Once we ve gained confidence that the handler works as expected, it can be used by many clients Local clients within the same JVM, for example, can submit an order request simply by invoking a method directly on an instance of the class We ve successfully put JMS in its rightful place as a glue technology Now, imagine we want to expose the logic of the OrderRequestHandler to remote clients.

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Note One perfectly valid option not discussed here is to remove the Quick Launch menu section altogether. This can easily be accomplished by removing, rather than editing, the sections of default.aspx discussed following.

Using the Session Fa ade design pattern, a session bean can service remote synchronous clients by delegating directly to an OrderRequestHandler instance Moving a step further, we can expose the same business logic to remote asynchronous clients by creating an MDB that either delegates directly to an OrderRequestHandler instance or indirectly through the Session Fa ade Figure 68 illustrates the multiple communication paths used to access the business logic that processes an order request Notice that by decorating a modular component in a layered fashion, we ve effectively created two communication paths: one synchronous and the other asynchronous Moreover, no code duplication exists We need only to change the business logic in one place to affect the synchronous and asynchronous clients uniformly That is, the business logic can be varied, independent of the client types that may chose to use it.

low lighting. In Android 2.2, these visual indications have been moved to the right and combined with the buttons that allow you to change settings. To take a photo, simply click the shutter button at the bottom-right corner of the screen. You ll notice a second or two delay before the picture snaps. While this is often frustrating when trying to get the perfect picture, it also gives the camera a chance to refocus after you ve pressed the button. On the Nexus One, there s no way to adjust focus by pressing on the desired focal point, as there is on the iPhone. You can only choose between letting Android do the focusing with autofocus, and setting the camera to infinity mode. You can use digital zoom on phones that support it by pressing on the screen until the + and buttons appear; or, in Android 2.2, by pressing the zoom slide adjuster at the lower-right corner of the screen, as shown in Figure 9 2.

The moral of the story is to remember that an MDB is simply a conduit between JMS clients and business logic As such, it should be kept as thin as possible After receiving a message, and possibly converting it into a lightweight business object, the MDB should delegate to other components that act on the contents of the message And we discovered all that by starting from a testing perspective Go figure! Now for a little fun with a familiar, albeit tiresome, game: hot potato..

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