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update that normal user s data. If after the administrator s page reads the normal user s data from the database, the normal user goes to a page displaying her data and makes a change, a conflict will occur when the administrator saves his changes to the database. If a conflict did not occur, the normal user s changes would be overwritten and lost. An alternative is that the normal user s changes could be saved, and the administrator s changes are lost. Which is the correct behavior at any given time is a complex problem. The first step is to detect it. The second step is to resolve it. There are two basic approaches for handling concurrency conflicts, optimistic and pessimistic.

interface and which can be used with minimal effort. In fact, you can extend the AbstractTableModel by implementing three simple methods: One that returns the row count Another that returns the column count A third that returns the value associated with a particular cell Listing 6-2 shows an example of how to implement this; the code modifies the TableValues class to extend AbstractTableModel and implements its three abstract methods. Listing 6-2. Extending AbstractTableModel import java.util.Calendar; import java.util.GregorianCalendar; import javax.swing.table.AbstractTableModel; public class TableValues extends AbstractTableModel { public public public public public final final final final final static static static static static int int int int int FIRST_NAME = 0; LAST_NAME = 1; DATE_OF_BIRTH = 2; ACCOUNT_BALANCE = 3; GENDER = 4;

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new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")), new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham")))); IEnumerable<XElement> elements = xDocument.Element("BookParticipants").Descendants("FirstName"); // First, we will display the source elements. foreach (XElement element in elements) { Console.WriteLine("Source element: {0} : value = {1}", element.Name, element.Value); } // Now, we will display the ancestor elements for each source element. foreach (XElement element in elements.AncestorsAndSelf("BookParticipant")) { Console.WriteLine("Ancestor element: {0}", element.Name); } Now, we should receive only the elements named BookParticipant. Here are the results: Source element: FirstName : value = Joe Source element: FirstName : value = Ewan Ancestor element: BookParticipant Ancestor element: BookParticipant Notice that the displayed output from the AncestorsAndSelf method is just the BookParticipant elements, because they are the only elements matching the name we passed. We didn t even get the source elements themselves, because they didn t match the name. So, the function worked as defined. Call us crazy, but this prototype of the operator seems fairly useless to us. How many levels of elements are you going to have in an XML tree with the same name If you don t answer at least two, how will this method ever return the self elements and any ancestor elements It just doesn t seem likely to us. Yes, we know; we like symmetrical APIs too.

public final static boolean GENDER_MALE = true; public final static boolean GENDER_FEMALE = false;

Narrowing down the number of sessions displayed in the session list can expedite the debugging process. Developers targeting a specific site or scenario will find that the session list can become rather busy since Fiddler will display all communications made through WinINET by all running processes. Multiple browser windows and Ajax-based web pages can contribute to the noise. Fiddler offers a number of ways to filter the information displayed in the session list. A handful of out-of-the-box commands can help to weed out messages that may not pertain to an issue being researched. The Filters tab offers even more control over this, giving developers a chance to include or exclude sessions based on commonly targeted data points. Developers looking to completely customize filtering can do so through script-based rules. The following sections highlight each of these methods in detail.

The Attributes operator can be called on a sequence of elements and returns a sequence containing the attributes of each source element.

public Object[][] values = { { "Clay", "Ashworth", new GregorianCalendar(1962, Calendar.FEBRUARY, 20).getTime(), new Float(12345.67), new Boolean(GENDER_MALE) }, { "Jacob", "Ashworth", new GregorianCalendar(1987, Calendar.JANUARY, 6).getTime(), new Float(23456.78), new Boolean(GENDER_MALE) }, { "Jordan", "Ashworth", new GregorianCalendar(1989, Calendar.AUGUST, 31).getTime(), new Float(34567.89), new Boolean(GENDER_FEMALE) }, { "Evelyn", "Kirk", new GregorianCalendar(1945, Calendar.JANUARY, 16).getTime(), new Float(-456.70), new Boolean(GENDER_FEMALE) }, {

public static IEnumerable<XAttribute> Attributes ( this IEnumerable<XElement> source ) This version of the operator can be called on a sequence of elements and returns a sequence of attributes containing all the attributes for each source element.

public static IEnumerable<XAttribute> Attributes ( this IEnumerable<XElement> source, XName name ) This version of the operator is like the first, except only those attributes matching the specified name will be returned in the sequence of attributes.

The Rules menu and the Fiddler toolbar provide a handful of basic commands for session filtering. Figure 7 16 shows those entries in the Rules menu (left) and the toolbar (right).

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