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No doubt you have seen some examples where controller actions directly contain data access code. With LINQ to SQL easy to use and growing in popularity, conference talks are featuring ASP.NET MVC Framework demos where a controller action performs a LINQ to SQL query. This works for small or short-lived applications, but it s inappropriate for longlived business applications because of the coupling. For years, the industry has known that coupling presentation with data access is a recipe for disaster. These concepts gave birth to the well-known data access layer. When using the ASP.NET MVC Framework, a controller is part of the presentation layer. The best practice is still to avoid putting data access in your presentation layer, any data access concern in a controller action creates technical debt that will put a tax on maintenance for the life of the application.

GTK_PRINT_STATUS_PENDING: All of the data has been sent to the printer, but the job has yet to be processed. It is possible that the printer may be stopped. GTK_PRINT_STATUS_PENDING_ISSUE: There was a problem during the printing. For example, the printer could be out of paper, or there could be a paper jam. GTK_PRINT_STATUS_PRINTING: The printer is currently processing the print job. GTK_PRINT_STATUS_FINISHED: The print job has been successfully completed. GTK_PRINT_STATUS_FINISHED_ABORTED: The print job was aborted. No further action will be taken unless you run the job again. The value returned by gtk_print_operation_get_status() can be used within applications, since it is a numerical value. However, GTK+ also provides the ability to retrieve a string with gtk_print_operation_get_status_string(), which is a human-readable description of the print job status. This can be used for debugging output or displaying more information to the user about the print job. For example, it could be displayed on a status bar or in a message dialog.

One benefit that we can capitalize on immediately when separating our data access layer from the presentation and business layers is unit testing. While unit testing our screen controllers, you ll notice we frequently fake out the repository interfaces so that they return a canned list of objects as the context for a test. Unit-testing controllers

Now that the print operation is set up, it is time to implement the necessary signal callback functions. The begin-print signal is emitted when the user initiates printing, which means that all settings have been finalized from the user s point of view. In Listing 12-4, the begin_print() callback function is used to first retrieve the contents of the file and split it into the number of lines. The total number of lines is then calculated, which can be used to retrieve the number of pages. Listing 12-4. Callback Function for the begin-print Signal /* Begin the printing by retrieving the contents of the selected files and * splitting it into single lines of text. */ static void begin_print (GtkPrintOperation *operation, GtkPrintContext *context, Widgets *w) { gchar *contents; gdouble height; gsize length; /* Retrieve the file contents and split it into lines of text. */ g_file_get_contents (w->data->filename, &contents, &length, NULL); w->data->lines = g_strsplit (contents, "\n", 0); /* Count the total number of lines in the file. */ w->data->total_lines = 0; while (w->data->lines[w->data->total_lines] != NULL) w->data->total_lines++;

In some cases, the rexec command was used to remotely execute a command on the additional machines with the guessed password..

should never involve any persistence mechanism or exercise external dependencies. We covered unit testing of controllers in detail in chapter 4, but in a unit test, the repository implementation will never come into play. A test double, or substitute object, will always be provided for the interface.