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5. Such attacks are called network-layer denial-of-service attacks. Application-layer denial-of-service attacks are also possible, in which vulnerabilities in applications are exploited to make systems unavailable.

In the preceding two chapters, we saw how to encapsulate behavior and information with classes. Using the concepts of association, composition, aggregation, and derivation, we modeled relationships between those classes and looked at some of the benefits of polymorphism along with the use and abuse of virtual functions and their implied contracts with derived classes. In this chapter, we ll look at a functional (rather than class-based) approach to composition and extensibility, and see how we can use this to implement some of the patterns that have previously required us to burn our one and only base class and override virtual functions; and all with the added benefit of a looser coupling between classes. Let s start with another example. This time, we want to build a system that processes incoming (electronic) documents prior to publication. We might want to do an automated spellcheck, repaginate, perform a machine translation for a foreign-language website, or perform one of any other number of operations that our editors will devise during the development process and beyond. After some business analysis, our platform team has given us a class called Document, which is shown in Example 5-1. This is their baby, and we re not allowed to mess with it.

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public sealed class Document { // Get/set document text public string Text { get; set; } // Date of the document

public DateTime DocumentDate { get; set; } public string Author { get; set; }

}

the Internet and stored in a physically secure location where no one is allowed to access it, the computer will be very secure The problem is that such a computer is not readily available to anyone for use You want to design systems whose functionality is available to the largest possible intended audience while being as secure as possible A service like PayPal (wwwpaypalcom), which supports person-to-person payments, is an example of a system that generates more revenue the more users take advantage of it, and as such, its availability is critical users may get very upset if they cannot access their funds at a moment s notice How does one achieve availability in a system One method is to add redundancy to eliminate any single point of failure For example, consider a telephone network.

Two classes are said to be coupled if a change to one requires a change to another. We saw examples of that in the previous chapter. When we created our NamedPerson class, it required changes to the FirefighterBase and the Administrator classes. We therefore say that FirefighterBase and Administrator are coupled to NamedPerson. Of course, any class or function that refers to another class or function is coupled to that class that s unavoidable (indeed, desirable). But to make testing simpler and systems more reliable, we try to ensure that we minimize the number of other types to which any class or function is coupled, and that we minimize the number of couplings between any two types. That way, any given change to a class will have a minimal number of knock-on effects elsewhere in the system. We also try to ensure that we organize classes into conceptual groupings called layers so that more tightly coupled classes live together in one layer, and that there are a minimal number of well-controlled couplings between layers. As part of that layered approach, it is usual to try to ensure that most couplings go one-way; classes of a lower layer should not depend on classes in a layer above. That way, we can further limit (and understand) the way changes propagate through the system. The layers act like firewalls, blocking the further impact of a change. As usual with software design, these disciplines are not hard-and-fast rules, and they are not imposed by the platform or language; but they are common practices that the platform and language are designed to support.

Now we want to be able to process the document. At the very least, we want to be able to Spellcheck, Repaginate, or Translate it (into French, say). Because we can t change the Document class, we ll implement these methods in a static utility class of common processes, as we learned in 3. Example 5-2 shows this class, although the implementations are obviously just placeholders we re illustrating how to structure the code here, and trying to write a real spellchecker would be a rather large distraction.

static class DocumentProcesses { public static void Spellcheck( Document doc ) { Console.WriteLine("Spellchecked document."); } public static void Repaginate( Document doc) { Console.WriteLine("Repaginated document."); } public static void TranslateIntoFrench( Document doc ) { Console.WriteLine("Document traduit."); } } // ...

Now we can build a simple example of a document processor that translates, spellchecks, and then repaginates the document (see Example 5-3).

static class DocumentProcessor { public static void Process(Document doc) { DocumentProcesses.TranslateIntoFrench(doc); DocumentProcesses.Spellcheck(doc); DocumentProcesses.Repaginate(doc); } }

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