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In the last chapter, we showed you some basic Qt features using a prototype of Shake, our earthquake-reporting application that takes data from the U.S. Geological Survey and renders the result as a list of earthquake events, showing the data associated with a specific event. The application had several shortcomings, including a user interface that doesn t match the classic item list/item view paradigm of most mobile applications, an inability to determine how close you were to a particular event, and no good way to get a geographic overview of all of the events that have occurred. For this chapter, we ve extended Shake in several ways: The application now has separate list, item, and map views, as Figure 5 3 shows. As with other Qt mobile applications, the views are selected from the options menu, although selecting a list item also shows the item view.

one block of code with a lock, then the data will become corrupted . Also, there is no way to prove that you have added all your locking code correctly . You just have to run your application, stress-test it a lot, and hope that nothing goes wrong . In fact, you should test your application on a machine that has as many CPUs as possible because the more CPUs you have, the better chance that two or more threads will attempt to access the resource at the same time, making it more likely you ll detect a problem . The second problem with locks is that they hurt performance . It takes time to acquire and release a lock because there are additional method calls and because the CPUs must coordinate with each other to determine which thread will acquire the lock first . Having the CPUs in the machine communicate with each other this way hurts performance . For example, let s say that you have code that adds a node to the head of a linked list:

FIGURE 5-6 Following the Call to Action headline from Act I (upper left), the three types of headlines you

functionality, discussed later in this chapter. Java also provides the java.util.StringTokenizer as a flexible mechanism to split strings without using regular expressions; .NET has no direct equivalent. The .NET String.Split method splits a string into component parts based on the location of a definable set of characters, returning an array of components from the source string.

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { try { chain.doFilter(request, response); HibernateUtil.commitTransaction(); } finally { HibernateUtil.closeSession(); } }

After selecting a network type and Internet connection method, create a network diagram to visually show which network devices are needed and then select the necessary devices for the network, such as switches, wireless access points, rewalls, and network adapters.

Practice 2 Create an AJAX client behavior control that highlights a control as it receives focus. Wrap the control as a custom server control by using the ExtenderControl class.

Manage Routing And Remote Access routing interfaces Manage devices and ports Manage routing protocols Manage Routing And Remote Access clients

1. 2. 3.

Security principals and SIDs underlie so much of Windows security that as an administrator, you must have at least a basic understanding of how they work. SIDs are the fundamental building blocks of a token, which, in turn, is the basic entity used to check whether access is permitted. Understanding how these components function together and being able to assign permissions effectively using users, groups, domain groups, and the log-on types will enable you to be far more effective, and encounter far less surprises, as you delve deeper into Windows Security.

Until performance improvements are necessary, write code that is as simple and clean as possible. The time you ll save if you write the simplest and cleanest code as a matter of course can be used later to optimize those few places where code accidentally gets complex and laden. If you find opportunities to improve performance, remember that simple designs that use well-factored, modular code are more amenable to performance tuning than more complicated designs. In general, well-factored code is easier to change. And code that s easy to change is easier to tune. By encapsulating implementation details, modular components can respond to change, allowing us to change their underlying code without breaking their clients. Moreover, well-factored, modular code exposes succinct methods that serve as excellent starting points for optimizing a particular code path. Take, for example, the method in

To directly control whether a cached version of a page is used or whether the page is dynamically regenerated, respond to the ValidateCacheOutput event and set a valid value for the HttpValidationStatus attribute. Then, from the Page.Load event handler, call the AddValidationCallback method and pass an HttpCacheValidateHandler object with your method.

the method is called for a particular data type . This will increase an application s working set size, which will hurt performance . I will talk about this more in the Generics Infrastructure section of this chapter .

Monitoring Network Protocol Security 11-35