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Figure 13-7. Adding the performance counters handler 4. The last task in configuring this policy is to add a member name matching rule. Rightclick the Matching Rules node and select New Member Name Matching Rule. Select the new matching rule and click the ellipsis next to the Matches property. In the Match Collection Editor dialog box, add the AddTwoNumbers and SubtractTwoNumbers methods to that list, as shown in Figure 13-8.

Fortunately, most of the core classes are there, so even if you don t have a LinkedHashMap, you can probably make do with a Hashtable, and you can probably get around using a StringTokenizer with a little extra programming One big difference is that this micro version of the javautil package doesn t contain localization utilities such as Locale and ResourceBundle for internationalization Localization for small devices is a little more complex because you have only so much space for resources, and you d be surprised how much space bundles of strings to display can take up So you don t necessarily want to simply throw in every set of GUI labels for every language from Icelandic to Swahili willy-nilly the way you might with a desktop application.

CHAPTER 8 JOHNNXT IS ALIVE!

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Figure 13-8. Adding the SubtractTwoNumbers and AddTwoNumbers methods to the matching rule 5. Save this application configuration file. To finish the example, create a new Windows console application project. The project should reference the following Enterprise Library assemblies: Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.dll Microsoft.Practices.EnterpriseLibrary.Validation.dll Microsoft.Practices.EnterpriseLibrary.PolicyInjection.dll Microsoft.Practices.EnterpriseLibrary.PolicyInjection.CallHandlers.dll Once those references are added, the next task is to add the Main method and its code, as shown in Listing 13-8.

Listing 13-8. MyProgram Class public class MyProgram { /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main() { MyClass myClass = PolicyInjection.Create<MyClass>; Console.WriteLine("2 + 4 = {0}" ,myClass.AddTwoNumbers(2, 4)); Console.WriteLine("8 2 = {0}" ,myClass.SubtractTwoNumbers(8, 2)); } } Now that you ve had some practice using the Policy Injection Application Block, it s time to add it to our ACME POS application.

CHAPTER 8 JOHNNXT IS ALIVE!

That doesn t mean you shouldn t worry about localizing your labels, though; it just means it s a bit more complicated There are a few different strategies for localization discussed in 10 Until then, however, I ll just stick with English labels in the examples for simplicity The example class for this section is the class that contains the maze generation algorithm It illustrates the use of some standard javautil classes such as Vector and Random The maze algorithm is also an example of how you can make a fun game that s small and simple enough.

The web services for the ACME POS application are practically completed, and the web service proxy is in place. The next task will be to create the UI for the application. We will also add basic validation to the domain logic layer.

CHAPTER 8 JOHNNXT IS ALIVE!

for even a very limited device by using some familiar ideas. There are a whole lot of familiar types of games in the public domain that you can program in MIDP without worrying about running afoul of someone s copyright. In fact, this game is simple enough that it only requires MIDP 1 classes. Figure 2-7 shows the maze game running on a MIDP 1 handset.

In the ACME.POS.Service.Client project of the ACME.POS solution, if there are any Windows forms classes, go ahead and remove them now. Create two new Windows forms classes: SearchForm.cs and CustomerForm.cs. Change the Text property of the SearchForm class to Search for Customer. and the Text property of the CustomerForm class to Customer. Add the Windows controls listed in Table 13-3 to the SearchForm form. Figure 13-9 shows the layout of these controls.

If you do not feel like building these Windows forms, you can find prebuilt versions within the solution located in the 13\Begin directory of this book s downloadable source code.

CHAPTER 8 JOHNNXT IS ALIVE!

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