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Program: This refers to the sequence of instructions involved in a script or application; it is also used as a general term to describe an executable computer file.

<id name="id" column="product"> <generator class="foreign"> <param name="property">campaign</param> </generator> </id> <one-to-one name="campaign" class="com.hibernatebook.xmlmapping.Campaign" constrained="true"/> There are some limitations to this approach: it cannot be used on the receiving end of a many-toone relationship (even when the many end of the association is limited by a unique constraint), and the slave entity cannot be the slave of more than one entity. In these circumstances, you will need to declare the master end of the association as a uniquely constrained one-to-many association. The slave entity s table will then need to take a foreign key column associating it with the master s primary key. The property-ref attribute setting is used to declare this relationship, like so: <one-to-one name="campaign" class="com.hibernatebook.xmlmapping.Campaign" property-ref="product"/> The format used in this example is the most common. The body of the element consists of an infrequently used optional element: (meta* | formula*) We discuss the <many-to-many> element and the alternative approach of composition in some detail in the Mapping Collections section later in this chapter.

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In Silverlight, the main UI thread is not just tied to the Silverlight plug-in. The UI thread is also the thread that runs the web browser process. Therefore, you can completely ruin the user experience if you use concurrency patterns incorrectly. For example, Listing 10-12 shows a UI that is creating a secondary thread from the ThreadPool and blocking the UI until the method completes. Listing 10-12. Blocking the main application thread (UI thread) is a very bad practice in Silverlight applications. ManualResetEvent mReset; private void LayoutRoot_Loaded(object sender, RoutedEventArgs e) { // Initialize the manual reset event this.mReset = new ManualResetEvent(false); // Queue up another thead to process work ThreadPool.QueueUserWorkItem(this.DoWork); // Block the UI thread until the the DoWork method completes this.mReset.WaitOne(); // tell the user processing is finished MessageBox.Show("Finished"); } private void DoWork(object state) { // Mimic doing expensive work Thread.Sleep(5000); // Set the Manual ResetEvent this.mReset.Set(); }

Note If you create a blank Silverlight application and add the Loaded event to the LayoutRoot control, you can run this test yourself by adding the code from Listing 10-12.

The many-to-one association describes the relationship in which multiple instances of one class can reference a single instance of another class. This enforces a relational rule for which the many class has a foreign key into the (usually primary) unique key of the one class. Table 7-9 shows the attributes permissible for the <many-to-one> element.

Software development cycle: In this structured approach to developing software, each stage can be fed back into previous stages. See 2. Version number: This number corresponds to a new development in a piece of software. These numbers may refer to major or minor changes and are generally assigned in increasing order. The method used for assigning these numbers is referred to as a versioning system.

When the code in Listing 10-12 executes, it blocks the main Silverlight thread for 5 seconds. During that time, the browser becomes unresponsive. You have probably seen this same pattern used in Windows Forms applications where the screen goes gray while the UI thread is blocked. It is true that many classic Windows applications suffered from long processes blocking the main thread. Even though this could be frustrating, the user could simply wait out the process. In Silverlight applications hosted on the Web, this problem is amplified because blocking the UI thread will block both the Silverlight application and the browser hosting it! Imagine if you are a user with several tabs open for browsing and your Silverlight web site locks up the entire browser. You will not have a good user experience on that site. If a developer is lazy, they might get away with it in a local Windows application; however, bringing down the entire browser is many times worse. The code in Listing 10-12 can be improved by blocking the secondary thread instead of the main thread. Therefore, if you require a pattern that needs to wait for background threads to complete, place the blocking content on a secondary thread. The first coding scenario in this chapter shows this technique which can be used with filtering large data sets.

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