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Managing Application Modules
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In 4, the Create Business Components from Tables wizard created a default application module, and you ve already been using the application module to test various features of the business service you ve been building. We ll return to that in a moment, but first of all let s create a new application module.
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Creating an Application Module
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For this application you have identified a use case maintain employee details. This requires the user to view and maintain information about departments and the employees within each of the departments.
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The Application Module
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Select the package in which you want to create the application module, select File | New, and, from the New Gallery dialog, select ADF Business Components and then Application Module. Enter a Name of MaintainEmployeesAM and click Next. The next step, shown in Figure 7-1, is where you define which view objects are required for this application module. Move DepartmentsView from Available View Objects to Data Model. You now want to define that the data model should also include the employees for a particular department, rather than all employees. To accomplish this, select DepartmentsView1 in Data Model and move EmployeesView via EmployeesInDeptVL from Available View Objects to Data Model. You can optionally rename the view object instances within the application module. Click Finish to complete the application module creation. TIp It is important to emphasize the benefit of giving meaningful names to the view object instances within an application module. When it comes to building the UI, the view instance names can help guide the UI developer on their use.
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FIGUre 7-1.
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Creating an application module to maintain employee information
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You ve just defined an application module that encapsulates instances of view objects to implement the maintain employee details use case. You can now test this in the ADF Business Component Browser.
editing an Application Module
Now that you have created one application module, the next step is to fine-tune the default application module created earlier by the ADF Business Components from Tables wizard. First, if you haven t already done so, right-click AppModule in the Application Navigator and select refactor | rename, and for Rename To enter ManageCustomerOrdersAM. It obviously makes sense to name your application modules in a way that mirrors the use case they are implementing. As with other ADF Business Components artifacts, double-clicking the Application Navigator opens up the appropriate editor. The default behavior for the Create Business Components from Tables wizard is to create an application module with an instance of every possible view object and view link. This is shown in Figure 7-2. While this is useful for testing the view objects, the reality is that your application module will need to be refined to include only instances of view objects that are required for the business use case.
FIGUre 7-2.
Default application module created by Create Business Components from Tables wizard
7:
The Application Module
Of course, you could just delete this application module and create a new application module, but in this case we ll keep the application module and first remove all the view object instances from Data Model. You must remove the child nodes from Data Model before removing their parent nodes. Having cleared the view object instances in the application module, the next step is to include only the view object instance required to manage a customer order. In this case, that will require the data model to include a view of customers, the orders for a customer, the order items for each order, and an inventory check for each order item. NOTe Remember, an application module contains instances of view objects and view links. This means that there may be many instances of the same view object. For example, there may be an instance of OrdersView representing all orders, and an instance representing orders for a specific customer. Each instance has its own current record indicator and state information. Figure 7-3 shows the data model you are aiming to create.
FIGUre 7-3.
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