Creating the Sample Application |
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If User.Identity.IsAuthenticated = False Then Response.Redirect("login.aspx") End If
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@Entity public class Employee implements { @EmbeddedId @AttributeOverrides({ @AttributeOverride(name="lastName", column=@Column(name="LAST_NAME"), @AttributeOverride(name="ssn", column=@Column(name="SSN")) }) private EmbeddedEmployeePK pk;
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In chapter 2, we covered all the basic technologies that make up an Ajax application. With what we ve learned so far, it s possible to build that super-duper Ajaxpowered web application that you ve always dreamed of. It s also possible to get into terrible trouble and end up with a tangle of code, HTML markup, and styling that is impossible to maintain and that mysteriously stops working one day. Or worse, you end up with an application that continues to work so long as you don t breathe near it or make a sudden loud noise. To be in such a situation on a personal project can be disheartening. To be in such a situation with an employer s or paying customer s site someone who wants a few tweaks here and there can be positively frightening. Fortunately, this problem has been endemic since the dawn of computing and probably before that! People have developed ways to manage complexity and to keep increasingly large codebases in working order. In this chapter, we ll introduce the core tools for keeping on top of your code, allowing you to write and rewrite your Ajax application to your customer s heart s content, and still go home from work on time. Ajax represents a break from the previous use of DHTML technologies not only in the way the technologies are put together but also in the scale at which they are used. We re dealing with much more JavaScript than a classic web application would, and the code will often be resident in the browser for a much longer time. Consequently, Ajax needs to manage complexity in a way that classic DHTML doesn t. In this chapter, we ll give an overview of the tools and techniques that can help you keep your code clean. These techniques are most useful, in our experience, when developing large, complex Ajax applications. If you want to write only simple Ajax applications, then we suggest you skip ahead to the example-driven chapters, starting with chapter 9. If you already know refactoring and design patterns back to front, then you may wish to skim this chapter and move on to the application of these techniques to Ajax in chapters 4 through 6. Even so, the groundwork that we lay here is important in adapting these approaches to JavaScript, so we expect you ll return here at some point. We also take the opportunity at the end of this chapter to review the current state of third-party libraries for Ajax, so if you re shopping for frameworks to streamline your project, you may want to check out section 3.5.
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In the last chapter, we implemented a fake quote service that handed out phony price quotes from a random number generator. In this chapter, we implement the QuoteService described in the tutorial application design. You may recall from our tutorial application design discussion in chapter 3, that the price quote acquiring service should be developed as a stand-alone component. As a service, it simply answers stock and mutual fund price information when provided the symbol and type of the investment. This allows it to be reused by several platform implementations in the future. In particular, the service is used later when we rebuild our tutorial application for a PDA device in KJava (chapters 8 10). A separate service also makes for good design since this can also isolate the application from changes required in the service, and transversely isolate the application from changes in the service. In this tutorial example, we keep our connection and communications very simple, opting to use simple streams to get data. In fact, through the MIDP implementation of the GCF, we could use more specific Connection interfaces such as the HttpConnection (discussed in chapter 13). The HttpConnection provides a convenient HTTP protocol connection to MIDP applications without having to worry about how the communication/networking details. There are two reasons why this is not done in the tutorial. First, the HttpConnection is an MIDP implementation interface of the GCF. While it is mandatory for all MIDP vendor implementations, other profiles, or applications that do not use a profile may not have this type of interface availability. In order to maximize the portability of our QuoteService, we want to shy away from using a profile-specific implementation. Secondly, we are going to communicate with the Internet and ask for standard web pages. The great part about the World Wide Web is that it freely provides so much information to its users. Unfortunately, this information is not always free from the standpoint that many web pages today contain a deluge of advertisements and uninteresting data. If we were to use something like the HttpConnection and pull off an entire investment web page into the device at one time, it could overflow the device s available memory. For example, we found a typical investment center web page like those available from Yahoo or NASDAQ to contain as much as 35K of text. Therefore, the tutorial application must weed out the portions of the page needed as it reads the HTML in from a stream while ignoring the extra data in the page. In a real world implementation, quote data might be made available over a corporate server and served up as convenient XML data or, at least, very streamlined price data. Without this luxury, we want to be careful not to choke our small device with the amount of data coming from a single web page.
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package com.msi.manning.chapter9.SimpleShape; public class SimpleShape extends Activity { @Override protected void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(new SimpleView(this)); } private static class SimpleView extends View { private ShapeDrawable mDrawable = new ShapeDrawable();
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Testing Hibernate queries The Hibernate Tools for the Eclipse IDE support a Hibernate Console view. You can test your queries in the console window, and see the generated SQL and the result immediately.
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interface IComponent { // Name, Display } interface IComposite<T> IComponent where T : IComponent { // Add, Remove, Find }
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Building stand-alone applications with Ajax
Singleton Pattern |
9: Security and Personalization
from a home object
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