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your entity classes because it will limit its usability to relying on the container. This boils down to a scenario where you cannot test or use it outside the container. We suggest that you take this opportunity to migrate such code to the service layer (i.e., the session fa ade). Finder and select methods If you ve used CMP entity beans in EJB 2, you know that finder and select methods are defined in the home interface for the entity bean as shown here:
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JSP directories The account, cart, catalog, common, and order directories all contain JSPs for the relevant portion of the application. Their directory names are pretty self-explanatory as to what the contained JSPs represent.
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If you build this project and start the emulator running using the SD card image you created earlier in this chapter, you should see something like figure 10.4 when you start the SimpleCamera application from the Android menu. If you look at figure 10.4, you ll notice an odd black-and-white checked background with a bouncing gray box. The Android emulator generates this test pattern to simulate an image feed because the emulator isn t pulling a live feed from the camera. Now if you click the center button on the dpad in the emulator, the application will take a picture. To see the picture, click the Menu button; a menu appears on the camera view window with a single option, View Pictures. If you select View Pictures, you re taken to the Android picture explorer, and Figure 10.4 Test pattern coming you should see Android s image placeholders repre- from the emulator camera and senting the number of camera captures. You can displayed in the SimpleCamera also see the JPEG files that were written to the SD application card by opening the DDMS in Eclipse and navigating to mnt > sdcard > DCIM > Camera. You can see an example in figure 10.5. As you can see, working with the camera in Android isn t particularly complicated. To see how a real camera will behave, you ll have to test on a real handset until the emulator provides a simple way to connect to a camera on your computer. This workaround shouldn t stop you from developing your camera applications. A wealth of Android applications already makes sophisticated use of the camera, ranging from games to an application that uses a picture of your face to unlock your phone. Now that you ve seen how the Camera class works in Android, let s look at how to capture or record audio from a camera s microphone. In the next section, we ll explore the MediaRecorder class and you ll write recordings to an SD card.
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Create a StringBuffer to hold part of the page Open a stream to the appropriate Web site Read characters until the price has been found Don t forget to close the input stream Again, because there is no real need for an instance of QuoteService, the getQuotePage() method is declared static. It is also private since its only caller is getPrice() from within the class.
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33. Include an all target that builds it all. This may not be your default target though. This target should at least create all artifacts including documentation and distributable, but probably would not be responsible for installation. 34. Give primary targets a description. Targets with a description appear as Main targets in the projecthelp output. The description should be succinct and provide information beyond what the actual target name implies.
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Our ClockIn method is making use of a list of objects to keep track of who is in the station. To do that it is using the generic collection class List<T> we first saw in 2. Using the List.Contains method, the implementation checks that they weren t already in the station, and adds them if necessary. Everything is fine so far. Then we reach the RollCall method. We re using foreach to iterate over the clocked-in staff, but we don t actually have a method to call to get their names! We want a way of indicating that these disparate object types (firefighters, fire chiefs, and administrators) all support giving out their name. We saw one way of doing that already: we could create a common base class, and move the Name functionality in there. Let s see what happens if we try to do that. Practically speaking, we have two completely different implementations of the Name property. We saw that we can model that situation with an abstract base class from which Firefighter and Administrator both derive, both implementing the method in their own way. Here s our NamedPerson base with an abstract property for the Name:
@Entity @Indexed public class Furniture { @Id @GeneratedValue @DocumentId private Integer id; @Field(index= Index.TOKENIZED, store= Store.YES) private String color; public Integer getId() { return id; } public void setId(Integer id) { = id; } public String getColor() { return color; } public void setColor(String color) { this.color = color; } }
In the CaveatEmptor domain model, you use the nullable type java.lang.Long as your identifier property type everywhere. Because you re using generated,
import org.aspectj.lang.*; import org.aspectj.lang.reflect.*; public aspect JoinPointTraceAspect { private int _indent = -1; pointcut tracePoints() : Defining trace !within(JoinPointTraceAspect) join points && !call(*.new(..)) && !execution(*.new(..)) && !initialization(*.new(..)) && !staticinitialization(*);
You may have noticed in the previous example that we appear to have directly manipulated the HttpResponse, but that isn t the case. The Controller base class provides us with a shortcut property to an instance of HttpResponseBase. This instance acts as a facade to the actual HttpResponse but allows you to easily use a mockup if necessary to maintain testability. For an even cleaner testing experience, consider using a custom ActionResult.
Bean instances leave the Method-Ready Pool for the Does Not Exist state when the server no longer needs them that is, when the server decides to reduce the total size of the Method-Ready Pool by evicting one or more instances from memory. The process begins when a PreDestroy event on the bean is triggered. The bean class can register for this event by annotating a method with @javax.annotation.PreDestroy. The container calls this annotated method when the PreDestroy event is fired. This callback method can be of any name, but it must return void, have no parameters, and throw no checked exceptions. The bean class may define only one @PreDestroy method (but it is not required to do so). An @PreDestroy callback method can perform any cleanup operations, such as closing open resources.
To complete the declarative portion of the solution, copy the code shown in listing 1.15.
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