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In the aspect in listing 3.6, we introduce a member _minimumBalance of type float into the Account class. Note that introduced members can be marked with an access specifier, as we have marked _minimumBalance with private access. The access rules are interpreted with respect to the aspect doing the introduction. For example, the members marked private are accessible only from the introducing aspect. You can also introduce data members and methods with implementation into interfaces; this will provide a default behavior to the implementing classes. As long as the introduced behavior suffices for your implementation needs, this prevents the duplication of code in each class, since the introduction of the data members and methods effectively adds the behavior to each implementing class. In chapter 8, we will look more closely at doing this. 3.3.2 Modifying the class hierarchy A crosscutting implementation often needs to affect a set of classes or interfaces that share a common base type so that certain advice and aspects will work only through the API offered by the base type. The advice and aspects will then be dependent only on the base type instead of application-specific classes and interfaces. For example, a cache-management aspect may declare certain classes to implement the Cacheable interface. The advice in the aspect then can work only through the Cacheable interface. The result of such an arrangement is the decoupling of the aspect from the application-specific class, thus making the aspect more reusable. With AspectJ, you can modify the inheritance hierarchy of existing classes to declare a superclass and interfaces of an existing class or interface as long as it does not violate Java inheritance rules. The forms for such a declaration are:

Upon completion of the CloseJob Activity, the onActivityResult callback is invoked. When this situation occurs, this method receives a Bundle containing the data elements for the recently closed JobEntry B. If you recall, the ShowJob Activity was launched for result. , which permits a synchronous pattern, passing the result back to the caller. The requirement is to propagate this JobEntry data back up to the calling Activity, ManageJobs. Calling setResult() and passing the Bundle (obtained with getExtras()) fulfills this requirement. Despite the simple appearance of some text and a few easy-to-hit buttons, the ShowJob Activity provides a significant amount of functionality to the user. All that remains is to capture the signature to close out the job. Doing so requires an examination of the CloseJob Activity.

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This is fine if you want to directly subscribe to the object that contains the event, but it won t work if you want to catch the event at a higher level. Grid, for example, doesn t have a Click event exposed, and it wouldn t make much sense for it to do so because

hidden IFrames, HTML forms, XMLHttpRequest objects are identical in this respect. As with any web-based application, a malicious entity looking to interfere with your service has several points of leverage. Exploiting these weak points are known as man-in-the-middle attacks. Let s look at the measures we can take to protect ourselves from them.

Typically, queues live forever in the system until deleted. Therefore, this time, we tell the user to enter "Q" to end the client and we call inQ.Kill() to delete the queue from the system. 5.10.5 Compiling and testing the QuePok service Compile both client and service, as shown in figure 5.24. Now, launch the service in one window and a few clients in their own windows. The output in the service window is shown in figure 5.25.

The monitor s close integration between locking and notification may seem a little odd it s even getting in our way here. This example would work perfectly well if all waiting threads were released simultaneously, instead of having to wait while they acquire the lock in turn. But in fact, the combined locking and notification is critical to most uses of Pulse and Wait. Notifications concern a change to shared state, so it s vital that code that raises notifications be in possession of the lock, and also that when code discovers a notification, it is in possession of the lock so that it can look at the modified state immediately. Without this, all sorts of subtle races can occur in the gap between notification and lock acquisition or the gap between releasing a lock and waiting for notification.

Packages, also referred to as bundles, are a funny breed of file In a Finder window, they look like files However, to the system, they re not much more than a folder with more folders and files inside of it The most common form that packages take is Cocoa applications, although many Carbon applications are also built as packages The package format is also used by some kinds of files, such as TextEdit s rtfd format and Script Editor s scptd format The folders and files inside the package make up the different components of the application or file Although the Finder s dictionary does define a package class, the Finder normally identifies package-based files as application files, document files, and so on You can refer to a disk or folder s package elements, though, when you want to get a list of all the files that are really packages.

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