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This is all well and good, but you are probably thinking to yourself, The Patron form now lets you open the Patron Record form. And that form has an Edit button that lets you once again open the Patron form. If you get a rogue librarian, there may be millions of patron management forms on the screen at once. And that s all true. So, we had to add some code to prevent that from happening. The second False argument to PatronRecord.ViewPatronRecord is a flag that says, Don t show the Edit button on the Patron Record form. Similar code exists in the Patron Record form that stops the recursion.
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The iPhone and iPad use a multitouch-capable capacitive touchscreen. Users access the device by tapping around with their finger. This works very differently from a mouse. But a finger isn t a mouse. Generally, a finger is larger and less accurate than a more traditional pointing device. This disallows certain traditional types of UI that depend on precise selection. For example, the iPhone and iPad don t have scrollbars. Selecting a scrollbar with a fat finger would either be an exercise in frustration or would require a huge scrollbar that would take up a lot of the iPhone s precious screen real estate. Apple solved this problem by allowing users to tap anywhere on an iPhone screen and then flick in a specific direction to cause scrolling. Another interesting element of the touchscreen is shown off by the fact that a finger isn t singular. Recall that the iPhone and iPad touchscreens are multitouch. This allows users to manipulate the device with multifinger gestures. Pinch-zooming is one such example. To zoom in to a page, you tap two fingers on the page and then push them apart; to zoom out you similarly push them together. Finally, a finger isn t persistent. A mouse pointer is always on the display, but the same isn t true for a finger, which can tap here and there without going anywhere in between. As you ll see, this causes issues with some traditional web techniques that depend on a mouse pointer moving across the screen. It also provides limitations that may be seen throughout SDK programs. For example, there s no standard for cut and paste, a ubiquitous feature for any computer produced in the last couple of decades. In addition to resulting in some changes to existing interfaces, the input interface also introduces a number of new touches (one-fingered input) and gestures (twofingered input), as described in table 1.4.
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While this example perfectly matches how Queue<T> works, you probably wouldn t use a Queue<T> here in practice. You d want to handle crashes and power failures gracefully in this application, which means that in practice, you d probably store the list of waiting patients in a database, along with something such as a ticket number indicating their place in the queue. In-memory queues tend to show up more often in multithreaded servers for keeping track of outstanding work. But since we haven t gotten to either the networking or the threading chapters yet, an example along those lines would be premature.
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Listing 6.16 InsertPages.java
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Now we need to subscribe to those events. So let s create a couple of classes to simulate what the production department would need to do (see Example 5-22).
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now. Hopefully, you re using a tool to autogenerate the code. But don t be fooled! Code generation is the easy part. Once the code has been spewed out, you must maintain it. Inevitably, you ll end up trying to debug this EJB someday (although, of course, you might conveniently chalk it up to a mistake made by your rookie cube mate). We re only halfway home. Remember, we need to wrap the entire model with a Session Fa ade because direct access to the entity beans will require unacceptable communication costs. The session bean serving as a fa ade should create a KayakEJB entity bean instance based on specified input parameters and return a Kayak DTO to the client. Listing 8.5 shows the session fa ade to our Kayak entity EJB.
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CHA PTE R 5
To keep things as simple as possible, let s explore a client that uses the BidManagerBean stateless session bean to add a bid to the ActionBazaar site. We ll leave it as an exercise for you to extend the client code to use the BidderAccountCreatorBean stateful session bean. For starters, let s see how the code to use the BidManagerBean from another EJB might look:
Notice how Hibernate detected the modification to the text and nextMessage properties of the first message and automatically updated the database Hibernate did automatic dirty checking. This feature saves you the effort of explicitly asking Hibernate to update the database when you modify the state of an object inside a unit of work. Similarly, the new message was made persistent when a reference was created from the first message. This feature is called cascading save. It saves you the effort of explicitly making the new object persistent by calling save(), as long as it s reachable by an already persistent instance. Also notice that the ordering of the SQL statements isn t the same as the order in which you set property values. Hibernate uses a sophisticated algorithm to determine an efficient ordering that avoids database foreign key constraint violations but is still sufficiently predictable to the user. This feature is called transactional write-behind. If you ran the application now, you d get the following output (you d have to copy the second unit of work after the third to execute the query-display step again):
Long storedItemId = (Long) item1.get("id"); Session session = getSessionFactory().openSession(); session.beginTransaction(); Map loadedItemMap = (Map) session.load("ItemEntity", storedItemId); loadedItemMap.put("initialPrice", new BigDecimal(100)); session.getTransaction().commit(); session.close();
public class Seller { ... @OneToMany(cascade = CascadeType.ALL) public Items getItems() { } }
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Introducing JBoss Seam
update when you re only measuring vertical change, so it s best to have the user do it by hand. Next, you finish up the text field s functionality with the textFieldShouldReturn: method, which you ve met before D. This project contains two Interface Builder objects that can generate actions. When the text field is adjusted E, the project saves that destination height for future calculation, and then updates the current height using the resetGPS: method F. The latter method is also used when the Check Height button is pressed. Figure 17.4 shows these input devices, for clarity. Note that resetGPS: does two things. First, it starts the location update G, which you only turn on for brief one-time uses. Besides being more appropriate for monitoring altitude, this also helps save energy. Second, it starts your activity indicator going H. This object was created in Interface Builder, where you should have marked it with the hidesWhenStopped property. Interface Builder also automatically hides the view so that it doesn t appear when the program is loaded. As a result, Figure 17.4 An altitude program there s nothing on the screen until you start the anima- measures how high you ve climbed on a mountain of your choice. tion here, at which time a little activity indicator appears and continues animating until it s stopped (which we ll see in a minute). The heavy lifting is done when the location manager reports back its information I. Here, you check whether you re getting altitude information at all J. If you are 1), you move the red dot image and update its height label. To finish things off, you turn the location update back off 1!, and then stop the animation of the activity indicator 1@, which makes it disappear. Voila! You have a working altitude monitor (if you have an iPhone 3G) and a nice combination of a few different SDK elements.
Implementing an Interface |
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