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The MVC architecture is composed of several software patterns . Before exploring the ASP .NET version of MVC, it s worthwhile to make a short side trip to see how MVC uses software design patterns . At the moment when a person is faced with an act of design, he does not have time to think about it from scratch. Christopher Alexander, architect These words written by architect Christopher Alexander were intended originally to apply to building architecture . However, as any software developer can tell you, these words apply equally well to software development . It makes no sense to design something from scratch if there are some already established and reliable methodologies or components to help you get your software out the door sooner . Seasoned software developers might remember the Patterns movement from the mid-1990s . It really began to take flight around the end of 1993 . The idea of software design patterns is borrowed from work on building architecture patterns by Christopher Alexander . As a building architect, Christopher Alexander noticed many recurring themes in buildings that worked . The results of his investigation into architectural patterns resulted in two renowned books on the subject: A Pattern Language and The Timeless Way of Building . In 1995, four computer scientists collaborated to create a similar work within the software world Design Patterns: Elements of Reusable Object-Oriented Software, written by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides, and published by Addison Wesley . Design Patterns catalogues a number of software design patterns (approaches) for solving common software problems .

Only when the source is not in any package can you place it in the base of the source tree and expect <javac> to track dependencies properly, which is what we have been doing up until now If Ant keeps on recompiling your Java files every time you do a build, it is probably because you have not placed them correctly in the package hierarchy It may seem inconvenient having to rearrange your files to suit the build tool, but the benefits become clear over time On a large project, such a layout is critical to separating and organizing classes If you start with it from the outset, even on a small project, you can grow more gently from a small project to a larger one Modern IDEs also prefer this layout structure, as does the underlying Java compiler.

Be aware that dependency checking of <javac> is simply limited to comparing the dates on the source and destination files There is a secondary task to do more advanced dependency checking, which is covered in chapter 10 Even then, a regular a clean build is a good practice 252 Laying out the build directories We want to configure Ant to put all intermediate files those files generated by any step in the build process that are not directly delivered or deployed into the build directory tree A large project can use Ant to generate many kinds of intermediate files: HTML pages from XML source, Java source files from JSP source, even text or data files generated by running programs that Ant compiles and executes during the build.

Software design patterns represent a formal way to document a solution to a design problem . Software patterns generally describe solutions from a broad perspective and usually avoid spelling out a specific implementation . A written pattern describes the intent behind a pattern, the problem to be solved, and some specific applications of the pattern . Patterns come with descriptive names such as the Command pattern . The idea behind the Command pattern is to encapsulate a request as an object . This lets you parameterize clients with different requests, queue requests, and support operations that might be undone . Microsoft Message Queuing (MSMQ) is a great real-world example of the Command pattern . One of the most well known software architectures is the Model-View-Controller architecture (MVC, for short) . The MVC architecture combines several patterns to form a foundation suitable for creating applications . In general, the MVC pattern incorporates the Composite, Observer, and Strategy patterns . The Composite pattern partitions software concerns (in this case, the database, user interface rendering, and interaction concerns) . The Observer pattern describes a publish/subscribe relationship between software components . Finally, the Strategy pattern is used for selecting program behavior at run time .

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The simple project being developed in this chapter has none of these needs, but we will plan ahead by putting the compiled files into a subdirectory of build, a directory called classes Different intermediate output types can have their own directories alongside this one As we mentioned in section 241, the Java compiler lays out packaged files into a directory structure that matches the package declarations in the source files The compiler will create the appropriate subdirectories on demand, so we do not need to create them by hand What we do need to create is the top-level build directory, and the classes subdirectory We do this with the Ant task <mkdir>, which, like the shell command of the same name, creates a directory In fact, it creates parent directories, too, if needed:.