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For the purpose of this chapter, we make a distinction between core business logic and business rules so that we can understand their characteristics. We consider core business logic to be the implementation of basic business constraints, such as not being able to debit from a bank account when there is an insufficient balance. Business rules, on the other hand, model constraints due to forces such as business policies and regulations. For example, restricting the number of transactions per statement period and charging for extra transactions would normally be business rules. Although the distinction between the two is largely perspective-dependent, there is an understood boundary between the two for any given system. If, for example, charging for an extra transaction is fundamental to the business s operations, it may be treated as core business logic instead of a business rule. Core business logic tends to be more stable and inherently modular as opposed to business rules, which tend to change quickly and cross multiple modules. In business-to-business (B2B) and business-to-consumer (B2C) applications, rules play an important role. With rapid changes in the business environment, the deployment of business rules separately from the business core logic provides the needed agility to respond to a changing environment. For example, business rules can implement cross-product promotions quite effectively. A shopping cart application can involve rules that offer product suggestions based on

MSMQ (provided by the .NET Framework System.Messaging namespace) Enterprise Services (The .NET Framework namespace for COM+) These various technologies overlap and complement each other in different ways. In many cases, an application requirement can be fulfilled with two or more of these technologies. Perhaps the clearest example of a potential overlap is with XML Web services and .NET Remoting. Both technologies operate on the same principle, namely that they facilitate remote service invocation over a defined transport channel. .NET Remoting solutions are generally more focused on object invocation using Remote Procedure Calls (RPCs). On the other hand, XML Web service solutions tend to be more focused on invoking services by passing message-based requests. But these differences are simply a function of what the technologies are best at today. With today s technology, you do have flexibility and a choice on whether to deploy .NET Remoting versus XML Web services for the same application solution. And where you do not, it is fair to ask why the technologies should have different capabilities. After all, they are based on the same concept: allowing remote service calls over a defined transport channel. Figure 10-1 illustrates the high-level architecture for Indigo. Note that this diagram is adapted from a January 2004 MSDN Magazine article on Indigo (see the Appendix for detailed reference information).

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Note When throwing a RetryTransactionException to perform a retry, validate that conditions have changed

It s difficult to see how it could possibly be meaningful to have two identical rows in a query result, so if you think duplicates are likely, you should use the distinct keyword:

In the digital age the natural interaction through the touch screen or by stylus is gaining importance to provide real world user experience. With System.Windows.Controls.InkPresenter, Silverlight provides support to the ink feature. It represents a drawing surface supporting ink features input with a stylus, a mouse, or by touch. As part of core Silverlight, InkPresenter derives from Canvas and can display one or more UIElement objects. The key property Strokes represents a collection of ink Stroke objects displayed on the surface as StrokeCollection. Here, Ink refers to handwriting or drawing content input through a stylus, a mouse, or by touch. Each stroke (Stroke object) contains a DrawingAttributes property representing Color, Height, Width, and OutlineColor, and a StylusPoints property with location coordinates (X and Y coordinates). You can capture theses ink strokes by wiring MouseLeftButtonDown, MouseMove, and LostMouseCapture events of the InkPresenter control.

In this example, there are exactly 1,000 rows where column n1 is not null, and it has exactly 1,000 distinct values, and Oracle can see this in the statistics collected by the gather_table_stats() call. Column n2 is defined to be identical to column n1. In the first query, the optimizer will determine that n1 has a density of 1/1,000, with a total of 1,000 non-null rows, and decide that the cardinality will be 1. If you changed n1 to n2 in this query, the calculated cardinality would be the same. But when you run the query with the predicate where n1 = 50000 or n2 = 50000

These settings can be used to control WAR file generation, either in conditional <patternset> includes of JAR files, or in the <webdoclet> task. We don t need to do this, yet, but the option is important. Obviously, these configuration files are reusable across many projects. Building a directory of upload files Based on the configuration details, Ant knows which files to upload, so it copies them to a new redeployment directory, combining the configuration files with the WAR file itself.

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