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So, the real question isn t whether the Assigned and Role properties can be put into a common object that s relational thinking. Instead, the question is whether those properties have common behaviors (business rules or logic) that can be put into a common object. As it turns out, the Role property must be validated to ensure any new value is a real role. Since the Role property can be set in both ProjectResource and ResourceAssignment, that behavior could be duplicated. A better answer is to normalize that behavior, putting it into a central object. Let s call this new object Assignment, since it will be responsible for centralizing the code common to assignments of projects to resources and of resources to projects. Then both ProjectResource and ResourceAssignment can collaborate with Assignment to ensure that the Role property is validated. This means that Assignment will contain the rule method that implements the role-validation behavior. In 6, you ll see how the CSLA .NET framework defines the RuleHandler delegate to support exactly this type of scenario. Given a ValidRole() rule method in Assignment, both ProjectResource and ResourceAssignment merely have to associate that rule method with their Role properties to share the common behavior. Figure 3-8 illustrates this relationship.

This is a book about SQLite and using it for all kinds of problems. But there are times when you really want to abstract away the SQLite C API and deal with some more high-level abstraction that worries about all of the SQLite details for you. We ve intentionally steered clear of Core Data the data management abstraction layer available from iOS version 3 onward. We didn t do this because we wanted to tease you or make your life more difficult. Rather, we wanted to show you the heart of working with SQLite under iOS, rather than hiding it away. For those of you interested in more abstract management of your SQLite database access and management under iOS, you can check out the Core Data documentation at http://developer.apple. com/library/ios/.

Figure 3-8. ProjectResource and ResourceAssignment collaborating with Assignment In 17, I discuss the code to do exactly this.

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The responsibility of the Assignment object from Figure 3-8 is to manage the association between a project and a resource. This means that the Assignment object s behavior could include the idea of associating a project with a resource. This is a broader behavior than that provided by ProjectResources, which assigns a resource to a project, or by ResourceAssignments, which assigns a project to a resource. In fact, the behavior of Assignment is more general and encompasses the needs of both other objects. Of course, the ProjectResource and ResourceAssignment classes handle the real work of dealing with a resource assigned to a project or with a project associated with a resource. The collection classes really just add and remove these child objects, leaving it to the child objects to handle the details. The end result is that ProjectResource, to fulfill its behavior, can ask Assignment to do the actual work, as shown in Figure 3-9. The same is true of ResourceAssignment. The implication is that Assignment could have a method such as AddAssignment() that accepts a project s Id property and a resource s Id property, along with the role the resource will play on the project.

4. Create a method in the default class that contains the code shown in Listing 6-4. Listing 6-4. Basic Unsecured Code Listing for the Web Service Client // Create an instance of the Web service proxy StockTraderProxy.StockTrader serviceProxy = new StockTraderProxy.StockTrader(); // Call the service Console.WriteLine("Calling {0}", serviceProxy.Url); string Symbol = "MSFT"; StockTraderProxy.Quote q = serviceProxy.RequestQuote(Symbol); // Show the results Console.WriteLine("Web service Response:"); Console.WriteLine(""); Console.WriteLine( "\tSymbol:\t\t" + q.Symbol ); Console.WriteLine( "\tCompany:\t" + q.Company ); Console.WriteLine( "\tLast Price:\t" + q.Last ); Console.WriteLine( "\tPrevious Close:\t" + q.Previous_Close ); Compile and run the project to make sure that everything is working correctly. At this point you are calling the Web service using a proxy that derives from the System.Web.Services. Protocols.SoapHttpClientProtocol class.

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