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public static EntityManager getEntityManager() { EntityManager entityManager = _threadLocal.get(); if (entityManager == null) { EntityManager entityManager = emf.createEntityManager(); _threadLocal.set(entityManager); Associates EntityManager } with a thread return entityManager; }

<Button x:Name="MyButton" Background="Blue" Content="Dependency Properties Rock!"/> you can go into the code-behind file and set the Background property with code like this: // create a variable of the type SolidColorBrush // and set it to a new Red SolidColorBrush SolidColorBrush myBrush = new SolidColorBrush(Colors.Red); // apply the new variable to the Background of MyButton MyButton.Background = myBrush; This is all fine, and I am sure you understand DependencyProperties, but what if you have a situation where there is no DependencyProperty that meets your needs Say, for example, you want to be able to set the text on a custom UserControl. Sounds a lot like the issue we are having right now, doesn t it Well, for times like this, Silverlight allows us to register our very own custom DependencyProperties. We are going to have to open our ControlTemplateProject solution in Visual Studio 2010 to accomplish this feat. So fire up Visual Studio 2010, and let s open UC_GreenButton.xaml.cs and register our own custom DependencyProperty called GreenButtonsText: (you can see my newly added code in bold as follows): using using using using using using using using System.Windows; System.Windows.Controls; System.Windows.Documents; System.Windows.Ink; System.Windows.Input; System.Windows.Media; System.Windows.Media.Animation; System.Windows.Shapes;

Check your persistence provider s documentation if it requires you to use the ThreadLocal pattern. Next, we ll tackle the most important part of this chapter: EntityManager operations.

The heart of the JPA API lies in the EntityManager operations, which we ll discuss in upcoming sections. As you might have noted in listing 9.1, although the EntityManager interface is small and simple, it is pretty complete in its ability to provide an effective persistence infrastructure. In addition to the CRUD (Create,

namespace ControlTemplateProject { public partial class UC_GreenButton : UserControl {

In my humble opinion, one of the most important aspects of maintaining a production site is ensuring it s up-to-date and haxxor-proof. Provided a site is well-built, the only real tasks you ll be responsible for are checking server logs, creating site reports, and updating Drupal core or contributed modules. Make sure the Update Manager is enabled! The Update Manager sends you e-mails whenever there s an update available on a site you ve built. It s normally enabled when a site is installed using the standard install profile (see 2), but simply navigate to Reports Status report and check the status of Update notifications to ensure it s enabled; Drupal will give a warning if it isn t, as shown in Figure 11-1. To enable it, navigate to the Modules section, scroll to Update Manager, select the enable check box, and save.

Read, Update, and Delete) functionality we introduced in listing 9.1, we ll cover a few less-commonly used operations like flushing and refreshing. Let s start our coverage in the most logical place: persisting new entities into the database.

Recall that in listing 9.1, the addItem method persists an Item entity into the database. Since listing 9.1 was quite a few pages back, we ll repeat the addItem method body as reviewed in listing 9.4. Although it is not obvious, the code is especially helpful in understanding how entity relationships are persisted, which we ll look at in greater detail in a minute. For now, let s concentrate on the persist method itself.

#region GreenButtonsTextProperty DP public static readonly DependencyProperty GreenButtonsTextProperty = DependencyProperty.Register( "GreenButtonsText", typeof(String), typeof(UC_GreenButton), null); public String GreenButtonsText { get { return (String)GetValue(GreenButtonsTextProperty); } set { SetValue(GreenButtonsTextProperty, value); } } #endregion GreenButtonsTextProperty DP

public Item addItem(String title, String description, byte[] picture, double initialPrice, long sellerId) { Item item = new Item(); item.setTitle(title); item.setDescription(description); item.setPicture(picture); item.setInitialPrice(initialPrice); Seller seller = entityManager.find(Seller.class, sellerId); item.setSeller(seller); entityManager.persist(item);

Figure 11-1. Navigate to Reports Status report, and check the status of Update notifications to ensure you receive e-mails when a module has an available update.

return item; }