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This is basically the same code you wrote in the last stage of the web application refinement earlier in this chapter. However, with this approach, you have a clear contract for required input and returned output of an action. Because Command instances are sent across the wire, you need to implement Serializable (this marker should be in the concrete class, not the superclasses or interfaces). Let s implement the command handler. Implementing a command handler The command handler can be implemented in any way you like; its responsibilities are simple. Many systems need only a single command handler, such as the following:

Figure 2 8. Add to your new View-Based Application file by pasting the saved line of code (from the previous file) into the indicated area.

string[] strings = SoliloquizeLikeAUser(); StringBuilder output = new StringBuilder(); foreach (string line in strings) { // Do something to look at the line... // then... output.AppendLine(line); } Console.WriteLine(output.ToString());

public class Product { public Product() { } public public public public } int sku { get; set; } string productName { get; set; } decimal unitPrice { get; set; } string description { get; set; }

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using System; public class Button { public delegate void ClickHandler(object sender, EventArgs e); private ClickHandler click; public void AddClick(ClickHandler clickHandler) { click += clickHandler; } public void RemoveClick(ClickHandler clickHandler) { click -= clickHandler; } protected void OnClick() { if (click != null) click(this, null); } public void SimulateClick() { OnClick(); } } class Test { static public void ButtonHandler(object sender, EventArgs e) { Console.WriteLine("Button clicked"); } public static void Main() { Button button = new Button(); button.AddClick(new Button.ClickHandler(ButtonHandler)); button.SimulateClick(); button.RemoveClick(new Button.ClickHandler(ButtonHandler)); } }

You will notice that any unread messages are marked with a blue dot the message (see Figure 18-3). to the left of

There are a number of additional properties and methods that you should examine (particularly for the CLLocation class), but we re staying with the basics here. Generally, you ll see that the location information is generated much like the accelerometer information. You access a shared object (CLLocationManager) and set some standard properties for how you want it to work, including how often to update (distanceFilter). Like the accelerometer, you also have to explicitly turn location updating on (startUpdatingLocation). Afterward, you keep an eye on certain methods (as defined by CLLocationManagerDelegate). These methods generate an object (CLLocation) when location changes; you read the object to get the specifics. With those generalities out of the way, let s see how CLLocation works in a real example.

@NamedNativeQuery( name = "findUserWithMoreItems", query = "SELECT user_id , first_name , last_name, birth_date FROM users WHERE user_id IN (SELECT seller_id FROM items GROUP BY seller_id HAVING COUNT(*) > )", resultSetMapping = "UserResults")

from uploading all reports to the Home folder Instead, from the Home page you could use the New Folder button to create subfolders below the Home folder While how you organize folder content on your PC hard drive is a matter of personal preference, the RS folder namespace is publicly accessible Therefore, as a responsible administrator you need to carefully plan its structure before reports go live If you don t, you risk breaking client applications or links that have dependencies on the report folders Understanding the folder namespace Similarly to an OS file system, the Report Manager organizes reports in folders The RS folder namespace is a hierarchy that contains predefined (Home and My Reports) folders and user-defined folders that the administrator creates For example, figure 72 shows that we have created two folders, AWReporter and SampleReports.

CAUTION: There is an odd bug that sometimes manifests itself when creating new windows in Interface Builder. When you create a window, you should ensure, in the Window Attributes tab in the inspector, that the Release When Closed checkbox is not selected. Leaving this checked if it is checked to start with, and it isn t always will cause your application to throw an EXC_BAD_ACCESS exception when reopening this window programmatically after closing it. The reason is our old adversary memory allocation. It seems like the memory for the object is released when other components of the application think it is still around, leaving your application confused. Unfortunately, this still seems to throw an exception if you are using garbage collection, so it is well worth a check. Now repeat for the Clients and Task Types windows. These follow exactly the same process, and will need a similar amount of tidying. I would advise renaming the windows and array controllers as you go along. The final collection of windows should look something like Figure 9 15.

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