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Foursquare was cofounded by ex-Googler Dennis Crowley, who worked on a similar project, Dodgeball, which was purchased and abandoned by Google. However, Foursquare takes the social network to a new and different level by adding a gaming component. Dennis Crowley explained it to me as a method to combine exploring your city with gaming and a little bit of Boy Scout pride in earning merit badges and trophies. Certain combinations of check-ins in Foursquare earn badges. Some examples include checking into the same location three times, finding five karaoke bars, finding three places in Chicago with photo booths, or checking in after 3 a.m. on a school night. Checking into the same location regularly could also earn you a mayorship. The mayor of a location is the person who has checked in the most often in the last two months, so

EJB development has proven to be a complex and time-consuming process. Building object-oriented code is demanding in the best circumstances, but dealing with class loading issues, implementing multiple classes per bean, writing deployment descriptors, and deploying to an Application server all take time and energy away from the task at hand developing business logic. Unit testing and integration headaches further impede making headway. In this threatening storm, manual power isn t enough anymore. Fortunately, EJB development tools have finally begun to mature, negating any need to suffer under these rote processes, regardless of any integrated development environment (IDE) you or your peers choose. Code generation tools make implementing EJB as easy as writing the bean implementation class, then autogenerating everything else with simple metadata, a la Javadoc. Automated build tools iron out the wrinkles associated with performing regular builds and deployments, helping you stay on track and keep your schedule. Neglect these tools at your own risk. If your development process consists of more than making a code change and running a single command to build, deploy, and verify that the code works, you re working too hard. You re also taking yourself away from the context of your business problem, slipping off your business s logic development hat and slapping on a build guru beret. When making small changes and executing tests over and over again, these context switches can easily lead to costly mistakes, taking you out of your most productive zone. The time spent executing manual build and deployment tasks can seriously add up, pushing deadlines and even breaking your spirit. Waiting for long builds or server restarts, just to verify the functionality of a bean implementation, wastes valuable development time. The longer you wait for the results of a unit test, the more

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I want to keep only the TreeView web part on the page. So I need to iterate through the web part collection for the default.aspx page and remove any web parts not of the TreeView class (see Listing 9-4). Listing 9-4. Deleting Unwanted Web Parts Programmatically 'Get handle to web parts default.aspx page, and iterate through web parts Dim strThePage As String = strParentSite & strSiteName & "/default.aspx" Dim web As SPWeb = site.OpenWeb(strSiteName) Dim webParts As SPWebPartCollection = web.GetWebPartCollection(strThePage, Microsoft.SharePoint.WebPartPages.Storage.Shared) Dim wp As WebPartPages.WebPart Dim i As Integer Console.WriteLine("") For i = webParts.Count - 1 To 0 Step -1 wp = webParts(i) Console.Write(wp.Title & ": " & wp.GetType.ToString) If wp.GetType.ToString <> "MG.WebParts.DLTV.WebPart1" Then webParts.Delete(wp.StorageKey) Console.WriteLine(".... Deleted.") Else Console.WriteLine(".... Kept.") End If Next

Unfortunately, running into more complex re-entrant situations is common, especially when working on an existing project, in which major refactoring might not be an option. The EJB specification provides a mechanism to disable re-entrant code checks for a particular entity bean, by setting the reentrant element in the bean s deployment descriptor to True. If you decide to go with strictly local interfaces, then disabling re-entrancy is a safe workaround. However, this method instructs the container to disable reentrant code checking altogether, which is dangerous if you allow remote access to your entity beans. The bean developer and the author of the client code must ensure that no damaging re-entrant situations occur. Obviously, this is an errorprone situation, and is thus not a path to be taken lightly. So, while this solves our problem without forcing us to make ugly hacks or major refactorings, this solution forces us to do things in an ostrich-like stick-our-heads-in-the-sand manner we are fixing the problem by ignoring it and hoping that no re-entrant situations occur in code.

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