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The EntityManager has a new persistent context, which is used to save and load objects: Book newBook = new Book(); newBooksetBookName("HIbernate Recipes Phase1"); newBooksetPublishDate(new Date()); newBooksetPrice(50l); EntityTransaction tran = managergetTransaction(); tranbegin(); managerpersist(book); trancommit(); managerclose(); In JPA, the EntityManager replaces the session: it s a factory that provides transactions (EntityTransactions in this case) The save() method is replaced by the persist() method, which moves the book object from the transient state to the persistent state After the persist() method is called, the.

Count of odd numbers: 4

Like the Count operator from the previous example, many of the LINQ operators require you to supply code that directs how the operator performs its operation. You do this by using delegate objects as parameters. Remember from 15 that you can think of a delegate object as an object that contains a method or list of methods with a particular signature and return type. When the delegate is invoked, the methods it contains are invoked in sequence. LINQ defines a family of five generic delegate types for use with the standard query operators. These are the Func delegates. The delegate objects you create for use as actual parameters must be of these five types or of these forms. TR represents the return type, and is always last in the list of type parameters. The five generic delegate types are listed here. The first form takes no method parameters and returns an object of the return type. The second takes a single method parameter and returns a value, and so forth. public public public public public delegate delegate delegate delegate delegate TR Func<TR> ( TR Func<T1, TR > ( TR Func<T1, T2, TR > ( TR Func<T1, T2, T3, TR> ( TR Func<T1, T2, T3, T4, TR>( Return type Type parameters ); T1 T1 T1 T1

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{ _timer = new System.Timers.Timer(1000); _timer.Elapsed += new System.Timers.ElapsedEventHandler(PollingQueueData); _timer.AutoReset = true; _timer.Enabled = true; _timer.Start(); } private void _Initialization() { string solutionName = ConfigurationManager.AppSettings["Solution"]; string queueName = ConfigurationManager.AppSettings["QueueName"]; AzureSolutionCredential azureSolutionCredential = new AzureSolutionCredential(solutionName); Uri queueUri = ServiceBusEnvironment.CreateServiceUri("sb", solutionName, string.Format("/{0}/", queueName)); TransportClientEndpointBehavior userNamePasswordServiceBusCredential = new TransportClientEndpointBehavior(); userNamePasswordServiceBusCredential.CredentialType = TransportClientCredentialType.UserNamePassword; userNamePasswordServiceBusCredential.Credentials.UserName.UserName = solutionName; userNamePasswordServiceBusCredential.Credentials.UserName.Password = azureSolutionCredential.Password; QueuePolicy queuePolicy = new QueuePolicy(); queuePolicy.ExpirationInstant = DateTime.UtcNow + TimeSpan.FromHours(1); QueueClient = QueueRenewalHelper<T>.GetOrCreateQueue<T>( userNamePasswordServiceBusCredential, queueUri, ref queuePolicy); } protected void PollingQueueData(object source, System.Timers.ElapsedEventArgs e) { if (null != QueueClient) { try { _queueMessage = QueueClient.Retrieve(); } catch { } if (null != _queueMessage) { T queueData = _queueMessage.Value as T;

With this in mind, if you look again at the declaration of Count, which follows, you can see that the second parameter must be a delegate object that takes a single value of some type T as the method parameter and returns a value of type bool. public static int Count<T>(this IEnumerable<T> source, Func<T, bool> predicate ); Parameter type Return type Parameter delegates that produce a Boolean value are called predicates.

state of the book object is managed by the persistence context. Note that persist() doesn t return the serializable ID of the newly created record.

Now that you better understand Count s signature and LINQ s use of generic delegate parameters, you ll be better able to understand a full example. The following code first declares method IsOdd, which takes a single parameter of type int and returns a bool value stating whether the input parameter was odd. Method Main does the following: It declares an array of ints as the data source. It creates a delegate object called MyDel of type Func<int, bool>, and uses method IsOdd to initialize the delegate object. Notice that you don t need to declare the Func delegate type because, as you saw, it s already predefined by LINQ. It calls Count using the delegate object. class Program { static bool IsOdd(int x) { return x % 2 == 1; }

if (queueData is IComparable) { if (null == _lastQueueMessage || (queueData as IComparable).CompareTo(_lastQueueMessage.Value) != 0) { _lastQueueMessage = _queueMessage; if (null != _dataUpdateEvent) { _dataUpdateEvent(this, new QueueDataUpdateArgs<T>(_queueMessage.Value)); } } } else { throw new ArgumentException( "The data object must implement IComparable interface!", queueData.GetType().Name); } } } } } } 4. Add a new class, QueueDataUpdateArgs<T>, to the project SoftnetSolutions.ServiceBus.QueueFacade. This class is derived from the EventArgs class and accepts a generic type class as the embedded object for the queue message class. The implementation is shown in Listing 6-20.

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