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internalsealed class MyForm : Form { public MyForm() { Text = "Synchronization Context Task Scheduler Demo"; Visible = true; Width = 400; Height = 100; } // Get a reference to a synchronization context task scheduler private readonly TaskScheduler m_syncContextTaskScheduler = TaskScheduler.FromCurrentSynchronizationContext(); private CancellationTokenSource m_cts; protected override void OnMouseClick(MouseEventArgs e) { if (m_cts != null) { // An operation is in flight, cancel it m_cts.Cancel(); m_cts = null; } else { // An operation is not in flight, start it Text = "Operation running"; m_cts = new CancellationTokenSource(); // This task uses the default task scheduler and executes on a thread pool thread var t = new Task<Int32>(() => Sum(m_cts.Token, 20000), m_cts.Token); t.Start(); // These tasks use the sync context task scheduler and execute on the GUI thread t.ContinueWith(task => Text = "Result: " + task.Result, CancellationToken.None, TaskContinuationOptions.OnlyOnRanToCompletion, m_syncContextTaskScheduler); t.ContinueWith(task => Text = "Operation canceled", CancellationToken.None, TaskContinuationOptions.OnlyOnCanceled, m_syncContextTaskScheduler); t.ContinueWith(task => Text = "Operation faulted", CancellationToken.None, TaskContinuationOptions.OnlyOnFaulted, m_syncContextTaskScheduler); } base.OnMouseClick(e); } }

Now that you have a basic understanding of how to work with Query objects, you can learn what features are available to you for creating your own JPA QL queries. JPA QL is expressed in terms of the abstract persistence schema of an entity: its abstract schema name, basic properties, and relationship properties. JPA QL uses the abstract schema names to identify beans, the basic properties to specify values, and the relationship properties to navigate across relationships. To discuss JPA QL, we will use the relationships defined in 11.

public class CommandHandlerBean implements javax.ejb.SessionBean { public void setSessionContext(SessionContext sessionContext) throws EJBException, RemoteException {} public void ejbRemove() throws EJBException, RemoteException {} public void ejbActivate() throws EJBException, RemoteException {} public void ejbPassivate() throws EJBException, RemoteException {} public Command executeCommand(Command command) throws RemoteException, CommandException { try { command.execute(); } catch (CommandException ex) { HibernateUtil.rollbackTransaction(); throw ex; } return command; } }

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Boolean Equals(String value, StringComparison comparisonType) static Boolean Equals(String a, String b, StringComparison comparisonType) static Int32 Compare(String strA, String strB, StringComparison comparisonType) static Int32 Compare(string strA, string strB, Boolean ignoreCase, CultureInfo culture) static Int32 Compare(String strA, String strB, CultureInfo culture, CompareOptions options) static Int32 Compare(String strA, Int32 indexA, String strB, Int32 indexB, Int32 length, StringComparison comparisonType) static Int32 Compare(String strA, Int32 indexA, String strB, Int32 indexB, Int32 length, CultureInfo culture, CompareOptions options) static Int32 Compare(String strA, Int32 indexA, String strB, Int32 indexB, Int32 length, Boolean ignoreCase, CultureInfo culture) Boolean StartsWith(String value, StringComparison comparisonType) Boolean StartsWith(String value, Boolean ignoreCase, CultureInfo culture) Boolean EndsWith(String value, StringComparison comparisonType) Boolean EndsWith(String value, Boolean ignoreCase, CultureInfo culture)

@Target({METHOD, FIELD}) @Retention(RUNTIME) public @interface Basic { FetchType fetch() default EAGER; boolean optional() default true; }

If you want to use information systems correctly, you must be aware of the semantics (the meaning of things) of the underlying data model. A careful choice for table names and column names is a good starting point, followed by applying those names as consistently as possible. For example, the attribute address can have many different meanings: home address, work address, mailing address, and so on. The meaning of attributes that might lead to this type of confusion can be stored explicitly in an additional semantic explanation to the data model. Although such a semantic explanation is not part of the formal data model itself, you can store it in a data dictionary a term explained in the next section.

Although one can certainly write an entire book on relational databases, and another on SQL, the essentials of these technologies aren t hard to understand, and you ll understand the chapter better if we spend a little time on the basics. A database is a repository of data. A relational database organizes your data into tables. In this chapter, we ll use the Northwind database, which is available as a free download from Microsoft. It was originally intended for a much older version of SQL Server, but it works well for our examples in this chapter without requiring too much installation work on your part.

Besides being able to create reusable affine transformations, you can also modify the transforms at a much lower level. Any affine transformation is constructed from a 3x3 matrix that is then multiplied across the individual vectors of your path using matrix multiplication. If you have specific needs, you can use the CGAffineTransformMake function to create a matrix by hand. Using it looks like this:

public sealed class Timer : MarshalByRefObject, IDisposable { public Boolean Dispose(); public Boolean Dispose(WaitHandle notifyObject); }

This XAML simply creates a Storyboard that executes for two seconds, changing the RotationX from 0 to 360, and then repeating. This has the effect of rotating the image constantly through its x-axis in 3-D space.

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