Simple .NET/ASP.NET PDF document editor web control SDK

fold_left eval env stmts | IfThen (e, stmt) -> if evalE env e <> 0 then eval env stmt else env | IfThenElse (e, stmt1, stmt2) -> if evalE env e <> 0 then eval env stmt1 else eval env stmt2 | Print e -> print_int (evalE env e); env With these at hand, continuing the same interactive session, you can now evaluate the sample Kitty program: > match parseText sample with | Prog stmts -> eval Mapempty (Seq stmts) |> ignore;; 4950 val it : unit = ().

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Note As you ll learn later, you can t use a static cursor for this benchmark, as static cursors are cached

We then mark the beginning of the second scenario by invoking the method markMiddle(): JRunstats.markMiddle ( conn ); We now set the session cached cursors to 500 and execute the second scenario. We finally print out the results by invoking JRunstats.markEnd() to end our program: JDBCUtil.setSessionCachedCursors( conn, 500 ); stmtString = "select x from t1"; PreparedStatement pstmt1 = null;

If necessary, you can also compile the AST, the lexer, and the parser together into a DLL or as part of an EXE: fsc a o KittySyntax.dll kittyAst.fs kittyParser.fs kittyLexer.fs

Figure 3-10. A page displayed from a project that works even with a compilation error in another page Now none of this is relevant for production systems, you realize. These are subtleties that are, however, very nice changes while doing development. You can make and exercise changes with much less overhead. In addition to the features we ve looked at so far, the Dynamic Compilation model also provides some very handy functionality via the App_Code directory. Adding the App_Code folder is a special choice from within Solution Explorer, as shown in Figure 3-11. You can place any source file into this directory, and it s immediately available to the rest of the code in your application. For example, here s a simple helper function for loading and caching XML documents. public class WebStatic { public static DataSet GetXmlDoc(string fileName) { HttpContext ctx = HttpContext.Current; DataSet ds; ds = ctx.Cache[fileName]; if (ds == null) { ds = new DataSet(); ds.ReadXml(fileName); ctx.Cache.Insert(fileName, ds, new CacheDependency(fileName)); } return ds; } }

ResultSet rset1 = null; for( int i=0; i < 10000; i++ ) { try { pstmt1 = conn.prepareStatement( stmtString ); rset1 = pstmt1.executeQuery(); } finally { // release resources associated with JDBC in the finally clause. JDBCUtil.close( rset1 ); JDBCUtil.close( pstmt1 ); } } JRunstats.markEnd ( conn ); } finally { // release resources associated with JDBC in the finally clause. JRunstats.closeBenchmarkStatements ( conn ); JDBCUtil.close( conn ); } } }// end of program When we execute the program, we get the following results: B:\>java DemoSessionCachedCursors URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(PORT=1521) (HOST=rmenon-lap))(CONNECT_DATA=(SID=ora10g))) ------- Benchmark Results -------Results from RUNSTATS utility Run1 ran in 1311 hsecs Run2 ran in 1230 hsecs run 1 ran in 106.59% of the time Name STAT...opened cursors current <-- trimmed to save space --> Run1 Run2 0 Diff 1 1

There is one final case of parsing that is common when working with binary data That is, say you want to work with a format that is conceptually relatively easy to parse and generate (such as a binary format) but where the process of actually writing the code to crack and encode the format is somewhat tedious In this section, we cover a useful set of techniques to write readers and writers for binary data quickly and reliably As the running example, we will show a set of pickling (also called marshalling) and unpickling combinators to generate and read a binary format of our own design The combinators can easily be adapted to work with existing binary formats such as those used for network packets Picklers and unpicklers for different data types will be function values that have signatures as follows: type outstate = SystemIO.

Run1 latches total versus runs -- difference and pct Run1 Run2 Diff Pct 356,675 224,755 -131,920

Figure 3-11. Adding the App_Code directory By placing this cs file into the App_Code directory, it s instantly available from all the pages in your site. It even shows up via IntelliSense (see Figure 3-12), again without even compiling.