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Run-Time Configuration You can configure injection for the default or a specific constructor at run time by calling the RegisterType method of the Unity container. This approach also gives you a great deal of control over the process. The following code registers the MyNewObject type with a singleton (container-controlled) lifetime.
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write in Act II will appear on the Key Point, Explanation, and Detail slides.
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to the Tapestry-specific configuration, in this case the Tapestry application objects, as shown in Listing 7-21. Listing 7-21. Configuring an Application State Object Using HiveMind < xml version="1.0" > <module id="app" version="1.0.0" package="com.integrallis.techconf"> ... <!-- =================================================================== --> <!-- Server-side State --> <!-- =================================================================== --> <contribution configuration-id="tapestry.state.ApplicationObjects"> <state-object name="logged-in-user-data" scope="session"> <create-instance class="com.integrallis.techconf.web.tapestry.domain.LoggedInUser" /> </state-object> ... </contribution> ... </module> Listing 7-22 shows the LoggedInUser POJO, which is a simple wrapper to hold both the UserSummary and the ConferenceSummary DTOs. Listing 7-22. Simple LoggedInUser Application State POJO public class LoggedInUser implements Serializable { private UserSummary userSummary; private ConferenceSummary conferenceSummary; public ConferenceSummary getConferenceSummary() { return conferenceSummary; } public void setConferenceSummary(ConferenceSummary conferenceSummary) { this.conferenceSummary = conferenceSummary; } public UserSummary getUserSummary() { return userSummary; } public void setUserSummary(UserSummary userSummary) { this.userSummary = userSummary; } }
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A class that uses MailManager as a base type is free to override the OnNewMail method . This capability gives the derived class control over the raising of the event . The derived class can handle the new e-mail message in any way it sees fit . Usually, a derived type calls the base type s OnNewMail method so that the registered method(s) receive the notification . However, the derived class might decide to disallow the event from being forwarded .
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The task in the second exercise is to query the Orders table, and return for each customer the orders with the most recent order date for the customer . Here s the desired output when you run your solution against InsideTSQL2008, shown in abbreviated form: qr code dll
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net. This is an important concept there should be no reason for remote users to have to directly access each other s client systems over the corporate network. Allowing such activity will 1) cause an undue amount of overhead on the VPN server, and 2) expose the internal resources to unwarranted access due to the enablement of IP forwarding. PPTP packet filtering can be configured on either the VPN server or on an intermediate firewall. If there is an intermediate firewall, you should configure PPTP packet filtering on both the VPN server and the intermediate firewall. For more information about PPTP packet filtering, see Appendix B.
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Another option less common but equally valid is to compromise a computer where someone is already logged on. When a user logs on, as I mentioned earlier, Windows caches that user s NT hash in memory. An attacker with complete control over the computer can retrieve that hash and use it in the same way as any other hash. Again, this is a problem largely related to your operational practices. As you will see in 13, if you do not expose sensitive hashes on computers that are less sensitive (and hence less secure), you will not have this problem. In addition, if a criminal manages to compromise a computer to this extent, she can easily capture the plaintext password as well, as we will see in the next section.
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window or control always be manipulated by the thread that created it, so we sometimes write code that blocks a GUI thread until some other operation is done and then the GUI thread updates any windows and controls as needed . Of course, blocking the GUI thread hangs the application and provides a bad end-user experience . To avoid blocking threads, don t mentally assign a label to your threads . For example, don t create a spell-checking thread, a grammar-checking thread, a thread that handles this particular client request, and so on . The moment you assign a label to a thread, you have also said to yourself that that thread can t do anything else . But threads are too expensive a resource to have them dedicated to a particular purpose . Instead, you should use the thread pool to rent threads for short periods of time . So a thread pool thread starts out spell checking, then it changes to grammar checking, and then it changes again to perform work on behalf of a client request, and so on . If, in spite of this discussion, you decide to block threads, then use the kernel object constructs if you want to synchronize threads that are running in different AppDomains or processes . To atomically manipulate state via a set of operations, use the Monitor class with a private field .6 Alternatively, you could use a reader-writer lock instead of Monitor . Reader-writer locks are generally slower than Monitor, but they allow multiple reader threads to execute concurrently, which improves overall performance and minimizes the chance of blocking threads . In addition, avoid using recursive locks (especially recursive reader-writer locks) because they hurt performance . However, Monitor is recursive and its performance is very good .7 Also, avoid releasing a lock in a finally block because entering and leaving exception-handling blocks incurs a performance hit, and if an exception is thrown while mutating state, then the state is corrupted and other threads that manipulate it will experience unpredictable behavior and security bugs . Of course, if you do write code that holds a lock, your code should not hold the lock for a long time because this increases the likelihood of threads blocking . In the Using Collections to Avoid Holding a Lock for a Long Time section, I will show a technique that uses collection classes as a way to avoid holding a lock for a long time . Finally, for compute-bound work, you can use tasks (discussed in 26) to avoid a lot of the thread synchronization constructs . In particular, I love that each task can have one or more continue-with tasks associated with it that execute via some thread pool thread when some operation completes . This is much better than having a thread block waiting for some operation to complete . For I/O-bound work, the Asynchronous Programming Model (APM) invokes your callback method when the I/O operation completes; this is similar to a task s continue-with task .
The master defines the body as well as the single form element of each ASP.NET page. Note that if both the master and the content page define a server-side <form> tag, an exception is raised because the final page would end up having multiple forms. The structure of the page is based on a couple of tables one representing the topmost bar with the menu and one representing the header strip divided in two parts left (replaceable through a placeholder) and right (modifiable through a property). The topmost table presents two replaceable regions. One is the menu with shortcuts to frequently visited sites; the other is content in the bottom-right corner. This latter area is filled with a bitmap in the sample page shown in Figure 2-10.
internal static class RegisteredWaitHandleDemo { public static void Main() { // Construct an AutoResetEvent (initially false) AutoResetEvent are = new AutoResetEvent(false); // Tell the thread pool to wait on the AutoResetEvent RegisteredWaitHandle rwh = ThreadPool.RegisterWaitForSingleObject( are, // Wait on this AutoResetEvent EventOperation, // When available, call the EventOperation method null, // Pass null to EventOperation 5000, // Wait 5 seconds for the event to become true false); // Call EventOperation every time the event is true // Start our loop Char operation = (Char) 0; while (operation != 'Q') { Console.WriteLine("S=Signal, Q=Quit "); operation = Char.ToUpper(Console.ReadKey(true).KeyChar); if (operation == 'S') are.Set(); // User want to set the event } // Tell the thread pool to stop waiting on the event rwh.Unregister(null); } // This method is called whenever the event is true or // when 5 seconds have elapsed since the last callback/timeout private static void EventOperation(Object state, Boolean timedOut) { Console.WriteLine(timedOut "Timeout" : "Event became true"); } }
cid ----------1 1 1 2 2 2 cname ------------------------Cust 42 Cust 42 Cust 42 Cust 2 Cust 2 Cust 2 oid ----------1001 1002 1003 2001 2002 2003
value="{$customer_details->mMobPhone}" /> </td> </tr> {/if} </table> <br /> <input type="submit" name="sended" value="Confirm" /> <input type="button" value="Cancel" onclick="window.location='{ $customer_details->mReturnLink|prepare_link:$customer_details-> mReturnLinkProtocol}';" /> </form> 6. Create a new plugin file named function.load_customer_details.php in the presentation/smarty_plugins folder, and add the following to it: < php /* Smarty plugin function that gets called when the load_customer_details function plugin is loaded from a template */ function smarty_function_load_customer_details($params, $smarty) { // Create CustomerDetails object $customer_details = new CustomerDetails(); $customer_details->init(); // Assign template variable $smarty->assign($params['assign'], $customer_details); } class CustomerDetails { // Public attributes public $mEditMode = 0; public $mCustomerDetailsTarget; public $mReturnLink; public $mReturnLinkProtocol = 'http'; public $mEmail; public $mName; public $mPassword; public $mDayPhone = null; public $mEvePhone = null; public $mMobPhone = null; public $mNameError = 0; public $mEmailError = 0; public $mPasswordError = 0; public $mPasswordConfirmError = 0; public $mPasswordMatchError = 0; public $mEmailAlreadyTaken = 0;
Open the webpage in Visual Studio. Click the Source tab at the bottom of the webpage. In the Source view of the webpage, type the web server control element and its attributes (see Figure 4-1). Alternatively, you can drag a control from the Toolbox directly into the page source.
This code generates the following output:
4. The Solution Information page displays information about the solution, including displaying the full package details if you click the View solution package details button. Click Next to move to the next step you re already familiar with the files in the solution.
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