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Roughly speaking, there are two main types of dynamic content generation In the first, the scripting type, requests for the same scripted resource produce the same actions: the source page is pumped through the preprocessor every time, and each dynamic construct is distilled to HTML Typically, this type of content generation is limited to using special tags and local code expressions that may refer only to a set of built-in features and occasionally a set of global state variables such as the server response The problem with this approach is inherent: the dynamic functionality is often too limited, although it is simple to use Most important, no caching or compilation is done, and as such it is much slower than the compiled alternatives Furthermore, as dynamic functionality is added to a page, it becomes progressively more complex and more difficult to maintain, often leading to spaghetti code.

been processed. When the compilation is complete, open a command prompt and navigate to the /sql directory in the root of the source code tree. Generate the lexical hash by running the gen_lex_hash.exe utility as shown here: gen_lex_hash > lex_hash.h This will generate a new lex_hash.h file to use when compiling the server that will recognize the new symbols added to the lex.h file.

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Capturing common control patterns such as cancellation and progress reporting is an absolutely essential part of mastering concurrent programming However, one of the problems with NET classes such as BackgroundWorker is that they re often more imperative than you may want, and they force other common patterns to be captured by using mutable data structures shared between threads This leads to the more difficult topic of shared-memory concurrency, discussed later in the chapter Furthermore, the way BackgroundWorker handles cancellation means that you must insert flag-checks and early-exit paths in the executing background process Finally, BackgroundWorker isn t useful for background threads that perform asynchronous operations, because the background thread exits too early, before the callbacks for the asynchronous operations have executed.

Tying the dynamic content to the presentation layer in this way is well recognized as a significant drawback The second approach is the one taken by ASPNET and JSP Here a page scripting model is combined with an underlying compiled language (Java for JSP, and any NET language for ASPNET) and the speed of serving static content In this model, pages are composed of objects with complex life cycles and are generated/maintained by compiled programs, so a scripted page is translated to a program that generates the final HTML page and as a result can contain arbitrary logic expressed in the source language These programs are produced on the fly and maintained by the web container A change to a web page results in updating the server-side resource responsible for creating that web page.

Linux users, this is your chance to smile. The build scripts for the MySQL server include the compilation of the gen_lex_hash utility. For some distributions of the MySQL source code (5.1 and later), the utility is located in the /sql directory and is compiled with the mysqld server. Other distributions (some Windows distributions) place the utility in a directory named gen_lex_hash and have their own makefile. Generate the lexical hash by running the gen_lex_hash utility as shown here: gen_lex_hash > lex_hash.h This will generate a new lex_hash.h file to use when compiling the server that will recognize the new symbols added to the lex.h file. However, you really don t need to do this step because the makefile included with the Linux source code distribution performs this step for you. The only reason you might want to run the command is if you want to ensure there are no errors.

For this reason, it can often be useful to build abstractions that are similar to BackgroundWorker but that capture richer or different control patterns, preferably in a way that doesn t rely on the use of mutable state and that interferes less with the structure of the overall computation Much of the rest of this chapter looks at various techniques to build these control structures You start with a case study in which you build a type IterativeBackgroundWorker that represents a variation on the BackgroundWorker design pattern Listing 13-2 shows the code Listing 13-2 A Variation on the BackgroundWorker Design Pattern for Iterative Computations open SystemComponentModel open SystemWindowsForms /// An IterativeBackgroundWorker follows the BackgroundWorker design pattern /// but instead of running an arbitrary computation it iterates a function /// a fixed number of times and reports intermediate and final results.

This compilation causes a one-time penalty, but subsequent requests will be served without any processing by simply sending the result of the new page-behind code..

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