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root is always an entity because it must be able to stand on its own, and only entities can stand on their own. In figure 8.2, we see the Order aggregate. The aggregate root is the Order class, and another member of the Order aggregate is OrderLine. This isn t the complete Order aggregate, but it demonstrates some conventions of the aggregate pattern. It may seem trivial that we classify this object in the Order aggregate, but specifying ownership is valuable. We ve specified that the Order type owns the types in the Order aggregate. Objects in other aggregates aren t allowed to have a durable (non-transient) reference with the non-root objects in the Order aggregate.

GtkStatusIcon provides three signals. The activate signal is emitted when the user activates the status icon. The size-changed signal is emitted when the available size for the icon changes. This allows you to resize the icon or load a new icon to fit the new size, in which case you should return TRUE. If you return FALSE, GTK+ will scale the current icon to fit the new size. Lastly, the popup-menu signal is emitted when the user has indicated that a menu should be shown. Usually right-clicking the icon does this, but this is also dependent on the user s platform. This function accepts the two unsigned integers indicating which button was pressed and at what time it was activated. These two values should be sent to gtk_menu_popup() to display the menu. For the fourth parameter of gtk_menu_popup(), you will want to use gtk_status_ icon_position_menu(). This is a menu positioning function that will calculate where to place the menu on the screen.

OrderLine holds a reference to Product, which is another aggregate root. Types in an aggregate are allowed to hold references to other aggregate roots only, not to other non-root types in a different aggregate. For instance, a Supplier wouldn t hold a reference to an OrderLine because OrderLine is a non-root type in the Order aggregate. In short, if a type belongs to an aggregate, types in other aggregates must not hold a durable reference.

a What happens if an attacker tries to download /dev/random after you have made your modification b What might be some alternative ways in which to implement the maximum file size limit c Implement multithreading and a mechanism that allows a maximum number of concurrent downloads for a particular IP address 8 In the implementation of checkPath() in Section 31, we used the getCanonicalPath() method provided by the javaioFile class in Java Writing a good getCanonicalPath() function can be tricky! Write your own implementation of getCanonicalPath() that takes a string as input and returns a canonicalized pathname string without relying on calls to the operating system Rewrite checkPath() to use your implementation of getCanonicalPath(), and test that it works in SimpleWebServer Trade implementations with a classmate/colleague of yours and try to break it 9 Implement basic HTTP authorization for SimpleWebServer Read the HTTP 1.

GTK+ 2.10 introduced a number of new widgets and objects that add printing support to the library. While there are many objects in this API, in most instances, you will only need to directly interact with GtkPrintOperation, which is a high-level printing API that can be used across multiple platforms. It acts as a front-end interface for handling most print operations. In this section, we are going to implement an application that will print the content of a text file that the user selects in a GtkFileChooserButton widget. A screenshot of the default print dialog on a Linux system can be viewed in Figure 12-3. The user will select a file from the disk using a GtkFileChooserButton widget and click the Print button in the main window to open this dialog.