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It is time to collect together all the patterns along with the language features that were used to implement them in this book. It is worth reiterating that in some cases these implementations differ substantially from the traditional forms found with Java, C++, and older C# versions. Thus, in Table 11-1 interpret the Language features column as meaning modern, good and desirable rather than fixed, standard and only. This table is a useful companion to all the theory code programs, which can be found grouped on my web site for the book (http://patterns.cs.up.ac.za). In the second column, the features in italics were used in an alternative implementation or in the example, but not in the primary theory code. Most features are written in the plural, but there may be only one instance of them, depending on the size of the system the pattern is being applied to. The table is ordered by features used so that you can get a feel for which are the easy patterns to implement in terms of language knowledge; however, do not confuse this criterion with the pattern itself being easy. My personal experience is that the Adapter and Visitor patterns which appear in the top half of the table were two of the most challenging to implement. The difficulties centered around the interplay of types, as both of these are aimed at decoupling types. In a strictly type checked language, such as C#, considerable care has to be taken to get the parameters and object instances to match up correctly, even without considering generics.
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Table 11-1. Summary of patterns and language features Pattern Abstract Factory Bridge Builder Decorator Factory Method Adapter Proxy State Strategy Interpreter Visitor Fa ade Singleton Template Method Command Mediator Observer Flyweight Memento Prototype Chain of Responsibility Composite Iterator Language features interfaces interfaces interfaces interfaces interfaces interfaces, inheritance, interfaces, private interfaces, selection statements interfaces, selection statements recursion, selection statements interfaces, recursion namespaces private, nested classes, static property method overriding delegates delegates interfaces, delegates, events interfaces, structs, collections, indexers serialization, collections, indexers cloning, serialization, collections, indexers generics, exceptions interfaces, collections, generics, properties enumerators, foreach, query expressions (Linq) generics, recursion enumerated types, initializers threads threads implicit typing, initializers, anonymous types reflection generics, nullable types delegates, anonymous functions, threads, events collections Optional and in the examples generic, generic constraints extension methods generic, generic constraints
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Another way of looking at patterns is to examine which other patterns they interact with or support. Although somewhat subjective, Table 11-2 gives some idea of the pattern groupings from this angle.
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Table 11-2. Pattern interactions Pattern Abstract Factory Adapter Bridge Builder Chain of Responsibility Abstract Factory Composite Composite Interacts with or supports Bridge, Factory Method, Prototype, Singleton
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11: The Future of Design Patterns
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Table 11-2. Pattern interactions (continued) Pattern Command Composite Decorator Fa ade Factory Method Flyweight Interpreter Iterator Mediator Memento Observer Prototype Proxy Singleton State Strategy Template Method Visitor Fa ade, Abstract Factory Flyweight Decorator, Flyweight, Template Method Factory Method, Strategy Iterator, Composite, Interpreter Interacts with or supports Memento, Composite Builder, Decorator, Flyweight, Interpreter, Visitor, Chain of Responsibility, Command, Iterator Composite, Strategy Singleton Abstract Factory, Template Method Composite, Interpreter, Strategy, State Composite, Flyweight, Visitor Visitor, Memento, Composite Observer Iterator, Command Mediator Abstract Factory
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It is not surprising that the patterns with the most interactions are those that create and manage complex structures: Composite, Flyweight, and Abstract Factory. Many of the other patterns rely on these when they have more than a single type to deal with. Adapter and Proxy are not listed as having any interplays, but recall that they were also two of the patterns that came in multiple designs that were related to each other. A feature of this book has been the examples that illustrate each and every pattern. In several cases, the examples have been carried over several patterns, illustrating the interplays described above. In this way, I was able to strike a balance between variety and continuity. In many of the exercises, further adaptations of the examples using other patterns are suggested. Specifically, the Singleton pattern has not been used much in the book, and it would be a good one to try out with some of the existing programs. For ease of reference, Table 11-3 lists the examples and the patterns they are used in.
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Table 11-3. Examples illustrating patterns (continued) Example Course Rules Family Tree Gucci and Poochy (manufacturing) Menu system Mirrors Photo decorator, Photo Library, Photo Groups, Photo sets RCP Game, Tic-Tac-Toe game Seabird Sorting animator Sourcing avocados SpaceBook, Openbook, Coolbook Trusty Bank Visitor, Interpreter Iterator Abstract Factory, Builder Command Interpreter Decorator, Composite, Flyweight, Fa ade, Prototype, Adapter State, Memento Adapter Strategy, Template Method Factory Method Proxy, Bridge, Adapter Chain of Responsibility
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