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} catch { } } } } The CSharpBuildingBlock.QueuedBackgroundWorker assembly contains a building block component called QueuedBackgroundWorkerComponent. This component can place a worker item into a queue and run from a background thread. There are three events that can be fired up from that component, DoWork, ProgressChanged, and RunWorkerCompleted as Figure 3-12 shows. The event handlers need to be registered either at design time via the properties dialog as in Figure 3-12 or programmatically as shown in Listing 3-19. Listing 3-20 shows the event handlers for DoWork, RunWorkerCompleted, and ProgressChanged. After accomplishing these steps to create or delete blob storage with a large amount of data the rest is relatively simple and straightforward. What is left for you is instantiating CreateBlobStatus of DeleteBlobStatus as an ICommand type and passing it to QueuedBackgroundWorkerItem. The job will run in the background without locking up the UI thread. The progress and task accomplished event will be reported to the client as we expected. The upload blob name can be automatically generated. If the size of the contents of blob is greater than 2 MB, a suffix _large is attached to the end of the name. There is no particular constraint for the blob name as long as it meets the specification illustrated in Appendix A. To interrupt ongoing processing, either for creating or deleting, a user needs to set the flag of CancelAll from QueuedBackgroundWorkerItem by clicking on the Abort button.

The using alias directive allows you to assign an alias for either of the following: A namespace A type in a namespace For example, the following code shows the use of two using alias directives. The first directive instructs the compiler that identifier Syst is an alias for namespace System. The second directive says that identifier SC is an alias for class System.Console. Keyword Alias Namespace using Syst = System; using SC = System.Console; Keyword Alias Class The following code uses these aliases. All three lines of code in Main call the System.Console.WriteLine method. The first statement in Main uses the alias for a namespace System. The second statement uses the fully qualified name of the method. The third statement uses the alias for a class Console. using Syst = System; using SC = System.Console; // using alias directive // using alias directive

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Suppose you have a method for retrieving a Book object given its ID. Because you added the <many-toone> mapping, the Publisher object related to the Book should be retrieved at the same time: Session session = factory.openSession(); try { Book book = (Book) session.get(Book.class, id); return book; } finally { session.close(); } But when you access the Publisher object through book.getPublisher() outside this method, an exception occurs: System.out.println(book.getName()); System.out.println(book.getPublisher().getName()); If you put the access code inside the try block of the method body, everything is OK. What s the reason for this exception It happens because Hibernate doesn t load your Publisher object from the database until you first access the Publisher before the session is closed. This lazy initialization can avoid unnecessary database queries and thus enhance performance. Because the Publisher is first accessed outside the session (which has been closed), an exception is thrown. If you want the Publisher object to be accessed from outside the session, there are two possible solutions. One is to initialize the Publisher explicitly by calling the method Hibernate.initialize(). Doing so forces the Publisher object to be loaded from the database: Session session = factory.openSession(); try { Book book = (Book) session.get(Book.class, id); Hibernate.initialize(book.getPublisher()); return book; } finally { session.close(); } Another solution is to turn off lazy initialization for this association. Doing so may decrease performance because the Publisher object is loaded together with the Book object every time: <hibernate-mapping package="com.hibernaterecipes.chapter5"> <class name="Book_5_1" table="Book" schema="BOOK5"> . . . . . <many-to-one name="publisher" class="Publisher" column="PUBLISHER_ID" cascade="save-update" lazy="false" />

namespace MyNamespace { class SomeClass { static void Main() { Alias for namespace Syst.Console.WriteLine ("Using the namespace alias."); System.Console.WriteLine("Using fully qualified name."); SC.WriteLine ("Using the type alias"); } Alias for class } }

The rest of this chapter, from Listing 3-19 to Listing 3-23, shows the implementation of a Windows form user interface, including the event handling, application initialization, and GUI updating. This part should be straightforward to any professional .NET developer, and we are not going to drill down to analysis in detail. You can download the source code and verify the results attached to the end of this chapter and potentially use this as an administration tool to transmit a large amount of data to blob storage as part of the infrastructure of a cloud application. Listing 3-19. Register Events for Background Worker Items from the Client UI Class Constructor public FormBlobAccess() { InitializeComponent(); this._backgroundWorkeComponent = new QueuedBackgroundWorkeComponent(); this._backgroundWorkeComponent.DoWork += new System.ComponentModel.DoWorkEventHandler (this._backgroundWorker_DoWork); this._backgroundWorkeComponent.RunWorkerCompleted += new System.ComponentModel.RunWorkerCompletedEventHandler( this._backgroundWorker_RunWorkerCompleted ); this._backgroundWorkeComponent.ProgressChanged += new System.ComponentModel.ProgressChangedEventHandler( this._backgroundWorkeComponent_ProgressChanged ); _UpdateUI(); } Listing 3-20. Event Handler for DoWorker, RunWorkerCompleted, and ProgressChanged private void _backgroundWorker_DoWork(object sender, DoWorkEventArgs e) { if (e.Argument is CreateBlobStatus) { _command = (CreateBlobStatus)e.Argument; if (_backgroundWorkeComponent._QueuedBackgroundWorker .IsCancellationPending(_command)) { e.Cancel = true; } } else if (e.Argument is FibGeneratorState) { _command = (FibGeneratorState)e.Argument; } if (null != _command) { while (!_backgroundWorkeComponent._QueuedBackgroundWorker

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