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You can see that deleting the text file caused the item with key ItemTwo that depended on it to be invalidated and removed during the next scavenging cycle. At this point, the code is again waiting for you to press a key. When you do, it continues by calling the Remove method of the cache manager to remove the item having the key ItemOne, and displays the cache contents again. Then, after you press a key for the third time, it calls the Flush method of the cache manager to remove all the items from the cache, and again calls the method that displays the contents of the cache. This is the code for this part of the example.
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With symmetric encryption, both sender and receiver have a shared secret key. The distribution of the secret key must occur (with adequate protection) prior to any encrypted communication. However, with asymmetric encryption, the sender uses a private key to encrypt or digitally sign messages, while the receiver uses a public key to decipher these messages. The public key can be freely distributed to anyone who needs to receive the encrypted or digitally signed messages. The sender needs to carefully protect the private key only. To secure the integrity of the public key, the public key is published with a certifi cate. A certificate (or public key certificate) is a data structure that is digitally signed by a certification authority (CA) an authority that users of the certificate can trust. The certificate contains a series of values, such as the certificate name and usage, information identifying the owner of the public key, the public key itself, an expira tion date, and the name of the certificate authority. The CA uses its private key to sign the certificate. If the receiver knows the public key of the certificate authority, the receiver can verify that the certificate is indeed from the trusted CA and, therefore, contains reliable information and a valid public key. Certificates can be distrib uted electronically (through Web access or e-mail), on smart cards, or on floppy disks. In summary, public key certificates provide a convenient, reliable method for veri fying the identity of a sender. IPSec can optionally use this method for peer-level authentication. Remote access servers can use public key certificates for user authentication.
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The java.lang package is implicitly imported to all Java programs. C# does not implicitly import any classes. The
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To deploy an application, create or edit the appropriate Group Policy object (GPO) and add the application s Windows Installer package to either the user or computer policy, depending on whether you want it to apply to users or computers. The next time the user logs on or the computer restarts, Active Directory applies the relevant policy to the user or computer, depending on the package settings you specify in the GPO. Table 20-1 lists the GPO settings for installation actions.
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In this section, you ll look at a few examples of how to use the uri library to perform basic URL-related functions.
In C#, when you prefix the name of a method with the name of the interface that defines the method (IDisposable.Dispose as in this example), you are creating an explicit interface method implementation (EIMI) . Note that when you define an explicit interface method in C#, you are not allowed to specify any accessibility (such as public or private) . However, when the compiler generates the metadata for the method, its accessibility is set to private, preventing any code using an instance of the class from simply calling the interface method . The only way to call the interface method is through a variable of the interface s type . Also note that an EIMI method cannot be marked as virtual and therefore cannot be overridden . This is because the EIMI method is not really part of the type s object model; it s a way of attaching an interface (set of behaviors or methods) onto a type without making the behaviors/methods obvious . If all of this seems a bit kludgy to you, you are understanding it correctly this is all a bit kludgy . Later in this chapter, I ll show some valid reasons for using EIMIs .
This instance Int64 property returns the number of bytes that have been allocated by a specific AppDomain . The number is accurate as of the last garbage collection .
Integration Strategy
n no other place is the diversity of the Java landscape more apparent than in the arena of Web development frameworks. The rise of the Internet as an application platform coupled with the stateless nature of the HTTP protocol gave rise to the servlet API as the workhorse API used to bring Java to the Web. The servlet API helped formalize the usage of HTTP in Java and provide some simple constructs for dealing with the need to maintain state as required by dynamic applications. Servlets provided an initial avenue for Java on the Web. We built many pure servlet Web applications at it was soon apparent that for any application with more than a few pages and with medium to complex user interface requirements, servlets did not provide a high enough abstraction as separation of concerns between the business logic, presentation logic, and the actual view composed of HTML. With servlet development, developers often received mocked-up HTML pages from Web designers. Form that point, developers had to extract the HTML and place it in the servlet code using println statements and escaping common HTML characters like double quotes. Development time was also painfully slow with servlets since code changes could not be quickly tested without complete recompilation and redeployment. The shortcomings of the servlet API and inspiration from some of the early commercial and open source Web frameworks led to the creation of JavaServer Pages (JSP). This was a definitive improvement, especially in the area of productivity. JSPs changed the way Web applications were developed in Java. Instead of embedding HTML markup in Java, the metaphor flipped to embedding Java code in the HTML. Productivity increased because there was no longer a need to manually recompile and redeploy since JSPs are dynamically compiled into servlets on demand after a modification. Initially, JSPs seemed to solve a lot of the problems with servlet development, allowing Web designers to make ongoing changes to the HTML during the development process. Unfortunately, no good deed goes unpunished, and JSP-based applications, with their ability to embed Java code in the HTML via scriptlets, led to poor Web development practices such as placing heavy business logic in the presentation tier. In addition, JSPs didn t provide any good means of reusing the code placed in scriptlets which led to duplication of code and all of the headaches associated with copy-and-paste reuse. This is what most people refer to as JSP Model 1, in which JSP pages serve both as controllers or dispatchers and the model is accessed via beans used to communicate with back-end technologies such as EJBs. Model 1 coupled view and the dispatcher and effectively created many controllers. The problems with this approach became apparent in larger applications as the controller code grew out of proportion, rendering the almost-like-HTML JSPs to look more like
When I ran this code, it took 134,174 milliseconds to access the instance field of a NonMBRO class that is derived from Object, and it took 1,533,886 milliseconds to access the instance field of an MBRO class that is derived from MarshalByRefObject . So, accessing an instance field of a class derived from MarshalByRefObject takes more than 12 times longer! From a usability standpoint, a type derived from MarshalByRefObject should really avoid defining any static members . The reason is that static members are always accessed in the context of the calling AppDomain . No AppDomain transition can occur because a proxy object contains the information identifying which AppDomain to transition to, but there is no proxy object when calling a static member . Having a type s static members execute in one AppDomain while instance members execute in another AppDomain would make a very awkward programming model . Since there are no roots in the second AppDomain, the original object referred to by the proxy could be garbage collected . Of course, this is not ideal . On the other hand, if the original object is held in memory indefinitely, then the proxy could go away and the original object would still live; this is also not ideal . The CLR solves this problem by using a lease manager . When a proxy for an object is created, the CLR keeps the object alive for 5 minutes . If no calls have been made through the proxy after 5 minutes, then the object is deactivated and will have its memory freed at the next garbage collection . After each call into the object, the lease manager renews the object s lease so that it is guaranteed to remain in memory for another 2 minutes before being deactivated . If an application attempts to call into an object through a proxy after the object s lease has expired, the CLR throws a System.Runtime. Remoting.RemotingException . It is possible to override the default lease times of 5 minutes and 2 minutes by overriding MarshalByRefObject s virtual InitializeLifetimeServices method . For more information, see the section titled Lifetime Leases in the .NET Framework SDK documentation .
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