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To be durable, a business method must write all changes and new data to a permanent data store before it can be considered successful. This may seem like a no-brainer, but often it does not happen in real life. In the name of efficiency, changes are often maintained in memory for long periods of time before being saved on a disk drive. The idea is to reduce disk accesses which slow systems down and only periodically write the cumulative effect of data changes. Although this approach is great for performance, it is also dangerous because data can be lost when the system goes down and memory is wiped out. Durability requires the system to save all updates made within a transaction as the transaction successfully completes, thus protecting the integrity of the data.

handles caching automatically (see 8 for details). Also, because RoleList is read-only, the only event that needs to be handled is SelectObject: protected void RoleListDataSource_SelectObject( object sender, Csla.Web.SelectObjectArgs e) { e.BusinessObject = RoleList.GetList(); } The GetList() method returns the list of roles, either from the cache or the database. The beauty of this approach is that the UI code doesn t know or care whether the database was used to get the data; it just uses the result.

Wow! Seventeen assemblies, including WindowsApplication1, the main program. Most of the assemblies are framework-supplied DLLs. For Microsoft.VisualBasic, it s the Microsoft.VisualBasic.dll assembly; for System, it s the System.dll assembly.

Throughout this book, we have addressed methods used to repair and recover from specific types of failures:

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The ThisWorkbook module can contain only one copy of each event, such as the Workbook_NewSheet event. To use both the sample code from Section 11.5 and the sample code in this section, you can combine the Workbook_NewSheet code into one procedure:

In the two println() calls of listing 2.13 we see the string formatter in action. The first uses a format of %08x to display an eight-digit hexadecimal representation of the value of magic. The second example creates a date for 4 March 1991 using Java s Calendar and Date classes (months are indexed from 0, while days are indexed from 1). The format pattern %tA displays the day name (Monday, Tuesday, ...) from any date it is applied to. For more details on the various formatting options, consult the Java documentation for the java.util.Formatter class.

Description Runs with no user interaction because it does not show the user confirmation dialog boxes Does not regenerate SID on reboot Forces Setup to detect Plug and Play devices on the destination computers on the next reboot Restarts the source computer after Sysprep.exe has completed Shuts down without a reboot Forces a shutdown instead of powering off

In chapter 2, you were introduced to the application model that the Microsoft Ajax Library provides for client-side development. This model gives you an opportunity to write event-driven code on the client, similar to the server-side page lifecycle and event-handling code that server-side developers have grown accustomed to. In this example, you start by registering callback B functions for the browser load and unload events. When the page loads, you register a handler for the C keypress event. When the page unloads, you D release that handler to avoid any leaks (yes, leaks happen in JavaScript too).

Do you know what these key terms mean You can check your answers by looking up the terms in the glossary at the end of the book.

Since the NotUndoable attribute is used by business developers as they write normal business code, it is in the Csla namespace along with all the other types intended for use by business developers.

Figure 3.4 Some ActionBazaar bid-related actions. While bidders can place bids and view the current bids on an item, admins can remove bids when needed. All of these actions can be modeled with a singe stateless session bean.

In this exercise, you create two new data types that can be used in a database application to minimize errors when using different data types for the same type of data.

Once again, to understand this animation type better, examine the following small code segment:

Figure 7.3 The PropertyGridEditor part can automatically create editing elements for simple data types such as enums, strings, dates, and integers.

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