ASP.NET Web PDF Document Viewer/Editor Control Library

Dependencies are set up (using file system events) between the shadow DLL, the ASPX containing the markup used to generate the class file, the Web Project Assembly, and any other dependant assemblies If any of these dependencies change, the shadow DLL is deleted, and the next time your ASPX page is requested, the whole process starts from scratch to account for the new version In the meantime, as long as no dependencies are changed, this precompiled, shadow DLL services subsequent requests No file parsing, no interpretation, no code generation not even a JIT compilation needs to occur This shadow copy survives reboots of the web server If any dependencies change, the compilation will be redone using the previously generated class file The only time the generated code for the class needs to be created again is when the aspx file or code-behind files change.

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Note that at compilation time the lexer depends on the parser we define later in Listing 16-7. This is because the lexer must return the type of tokens required by the parser.

When I run the program for a fetch size of 100, for example, the results are as follows: URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(PORT=1521) (HOST=rmenon-lap))(CONNECT_DATA=(SID=ora10g))) Using Bfile On an average it took 30 ms (number of runs = 3225.) Using external table On an average it took 158 ms (number of runs = 1063.) As you can see, external tables run slower (they take around five times longer) in my test benchmarks compared to BFILEs. Runs for other fetch sizes yielded similar results. This does not mean that you should discard the idea of external tables. Remember that reading from a file such as this in a real production system is not a typical requirement. If you are indeed reading files regularly as this, you should consider loading them into the database anyway (external tables are an excellent tool for achieving a one-time load from files into tables). Loading files into the database also gives your application all the benefits that come from storing data in the database as opposed to retaining them in the operating system (e.g., the ability to recover data in the event of a crash). Also, external tables give you access to using SQL on the data to transform them on their way to the client. You should use all of these criteria in choosing the appropriate tool for your particular use case.

You can generate the lexer by calling fslex: fslex kittyLexer.fsl This produces kittyLexer.fs, which contains the implementation of the lexer.

This is why there s a noticeable delay for the first request of a Web Form after you deploy a new version There s a lot going on out there!.

Summary

Listing 16-7 shows the parser specification for the Kitty language in the file kittyParser.fsy. Listing 16-7. kittyParser.fsy: Parser for Kitty %{ open KittyAst %} // The start token becomes a parser function in the compiled code. %start start // These are the terminal tokens of the grammar along with the types of // the data carried by each token: %token <string> ID %token <int> INT %token PLUS MINUS TIMES LPAREN RPAREN IF THEN ELSE %token WHILE DO BEGIN END PRINT SEMI ASSIGN EOF // Associativity and Precedences - Lowest precedence comes first %left PLUS MINUS %left TIMES // This is the type of the data produced by a successful reduction // of the 'start' symbol: %type <prog> start %% start: Prog Prog: StmtList Expr: | | | | | ID INT Expr PLUS Expr Expr MINUS Expr Expr TIMES Expr LPAREN Expr RPAREN { $1 } { Prog (List.rev $1) } { { { { { { Val $1 } Int $1 } Plus ($1, $3) } Minus ($1, $3) } Times ($1, $3) } $2 }

In this chapter, you learned what LOBs are and how they are useful in storing large text and binary data. You learned how to read from and write to CLOBs and BLOBs, and how to read from BFILEs. You then looked at some Oracle-specific alternatives to using BFILE: the UTL_FILE PL/SQL package and external tables. Also, you discovered that UTL_FILE can be used to read and write to text and binary files, whereas external tables can be used only to read from text files. Finally, you compared these alternatives in terms of features and performance.