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Figure 6-5. Book details interface A vending machine wouldn t be very useful if there wasn t any way of replenishing the product. The BVM provides this via an administration interface. When the vendor needs to replenish the books or change the details to match a different set of books, the vendor opens the machine and closes the embedded application (this feature would have to be added to the example). The vendor would then restart the application providing the administrator switch on the command line like the one shown here: C:\>Books BookVendingMachine -admin The administration interface allows the vendor to enter an ad hoc query and execute it. Figure 6-6 shows the administration interface. The example shows a typical update operation to reset the quantity of the products. This interface allows the vendor to enter any query she needs to reset the data for the embedded application.

Some AutoFormats aren t listed when you apply AutoFormats to a pivot table. A different list of AutoFormats is available if you re formatting a regular table. Follow these steps to use one of the standard AutoFormats: 1. Select a cell in a normal worksheet table (for example, select a cell in your source data table). 2. Choose Format AutoFormat.

each concern s implementation and results in code tangling. Figure 1.7 illustrates code tangling in a module. In the code snippet for the SomeBusinessClass class in listing 1.1, the method SomeBusinessClass.someOperation1() contains code for authorization, contract enforcement, optimization, and logging, all tangled up with the core operation. Similarly, SomeBusinessClass itself contains operations for persistence management as well as a support structure for logging and cache management, which tangles them with the core state and behavior of the module. Code scattering Code scattering is caused when a single issue is implemented in multiple modules. Since crosscutting concerns, by definition, are spread over many modules, related implementations are also scattered over all those modules. For example, in a system using a database, performance concerns may affect all the modules accessing the database. We can classify the code scattering into two distinct categories: duplicated code blocks and complementary code blocks. The first kind is characterized by repeated code of a nearly identical nature. For example, resource pooling will typically involve adding nearly identical code to multiple modules to fetch a resource from a pool and return the resource back to the pool. Figure 1.8 illustrates the scattered duplicated code blocks.

The data for this example was created on a stand-alone MySQL server and copied to the embedded MySQL directory. When I created this application, I designed the data structures and the database to hold the data first. This is always a good idea.

To overcome this limitation, you can select a cell, click the Increase Indent button on the Formatting toolbar, then click the Decrease Indent button on the Formatting toolbar. This will change the cell s alignment to left aligned.

Figure 1.8 Code scattering caused by the need to place nearly identical code blocks in multiple modules to implement a functionality. In this banking system, many modules in the system must embed the code to ensure that only authorized users access the services.

Note Some developers may disagree, believing it is better to start with the user interface design and allow the data requirements to evolve. Neither practice is better than the other. The important point is the data must be a focus of your design.

The second kind of code scattering happens when several modules implement complementary parts of the concern. For example, in a conventionally implemented access control system, you will perform authentication in one module, pass the authenticated user to modules that need authorization, and then those modules will perform the required authorization. All these pieces must be carved to fit together perfectly much like puzzle pieces to implement the functionality, as shown in figure 1.9. In figure 1.9, multiple modules include code for authentication logic and access checking; they must work together to correctly implement the authorization. For example, before you can check the credentials of a user (access control), you must have verified that user s authenticity (authentication).