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The eagle-eyed will have noticed that the query that derives our food frequency for the iSeinfeld app includes the following clause: limit 50 Why limit this result set We did this to simplify our application and avoid dealing with operating large SQLite databases and datasets in our very first example under iOS. If we d attempted to do large database operations during the applicationDidFinishLaunching event, we ran the risk of incurring the wrath of the Watchdog Timer. The job of the Watchdog Timer is to ensure that all applications running on the iPad, iPhone, or iPod behave themselves. This includes preventing poorly performing applications from appearing to hang the device or consume too much processing time for a given action. Apple describes the role of the Watchdog Timer in the Apple iOS Developer documentation as a system monitor that checks to see how long an application takes to complete its initial startup (among other things). If the application takes too long, the Watchdog Timer will terminate the offending application with exception code 0x8badf00d (get it, bad food ). Related information will be written to the crash report for the incident. When you launch your code in Xcode, the Watchdog Timer is disabled so as to compensate for the various overheads that our OS X system will incur, such as invoking debuggers, and so on. This means you may not notice the effect of the Watchdog Timer under Xcode simulation. It s always best to test on real devices to see whether you re running into long-running action issues.

Tip Object models should be simple and intuitive, even when underlying behaviors are complex. By centralizing common behaviors using objects internal to the business layer, a simpler and more tailored public interface can be exposed to the UI developer.

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This really boils down to a few common-sense management approaches for working with SQLite applications under iOS: Don t perform time-consuming queries, or load large databases, during an startup event such as applicationDidFinishLaunching. When running queries that return large results sets or that will take considerable time, consider breaking them up into digestible pieces of work Explore the more advanced iOS API features for managing long-running tasks. At the end of the day, if the Watchdog Timer decides to intervene, you ll see the following (or similar) error: The application iSeinfeld quit unexpectedly Mac OS X and other applications are not affected Under a real iPad or iPhone, instead of this error message, you will see the application attempt to load the main view and abort partway through. You will usually be returned to the home screen. Armed with this knowledge, you should be able to keep the Watchdog Timer a happy hound.

Similarly, ProjectResource and ResourceAssignment have behaviors that involve removing a resource from a project or removing a project from a resource. Assignment, then, will have a more general behavior to remove an association between a project and a resource. Figure 3-9 shows the full extent of Assignment, including all the methods that implement behaviors common to both ProjectResource and ResourceAssignment.

Enable the Web service project for WSE 3.0 by following the next steps: 1. Right-click the StockTraderSecure project and select the WSE Settings Tool. On the General tab, check the Enable This Project for Web Services Enhancements box and the Enable Microsoft Web Service Enhancements Soap Protocol Factory box.

Summary

Figure 3-9. Objects collaborating with Assignment At this point, all the common behaviors from ProjectResource and ResourceAssignment have been normalized into a single location in the object model.

Part of object design includes reviewing things to ensure that the model won t lead to poor performance. This isn t really a single step in the process but rather something you should do on a continual basis during the whole process. However, once you think the object model is complete, you should always pause to review it for performance issues. One primary performance issue with many object models deals with the use of relational thinking when designing the objects. Normalizing data within the object model is perhaps the most common flaw causing performance issues. Because of the design of ProjectResource, ResourceAssignment, and Assignment, the object model has already eliminated this issue by normalizing behavior instead of data. This helps avoid loading entire business objects just to display a couple of common data elements.

You ve now experienced the trials and tribulations of creating your first (or latest) SQLite-based iOS application. We know your friends and family will be amazed at your newfound trivia knowledge. In all honesty, they ll probably be interested in just how easy it is to build your own iPad or iPhone application with SQLite. If you do decide to make it big with your iSeinfeld application, be sure to let us know. We d love to buy a copy of the application from iTunes to add to our collection of iSeinfeld variants.

Note The Soap Protocol Factory is only needed when accessing ASP.NET Web services that run under IIS.

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