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The following _runMethod() method simply selects the correct method to invoke based on the method number. If the connection is null, invoke the versions of firstMethod() and so on that don t take any parameters. private void _runMethod( int methodNumber, Connection conn, Object[] parameters ) throws Exception { if( conn != null ) { if( methodNumber == FIRST_METHOD ) firstMethod( conn, parameters ); else if( methodNumber == SECOND_METHOD ) secondMethod( conn, parameters ); else if( methodNumber == THIRD_METHOD ) thirdMethod( conn, parameters ); else { System.err.println( "Invalid method number: " + methodNumber ); System.exit( 1 ); } } else { if( methodNumber == FIRST_METHOD ) firstMethod( ); else if( methodNumber == SECOND_METHOD ) secondMethod( ); else if( methodNumber == THIRD_METHOD ) thirdMethod( ); else { System.err.println( "Invalid method number: " + methodNumber ); System.exit( 1 ); } } } At the end of the program, we declare three constants denoting method numbers to be passed as parameters to runMethod() by the program that overrides JBenchmark. public static final int FIRST_METHOD = 1; public static final int SECOND_METHOD = 2; public static final int THIRD_METHOD = 3; }// end of class The program DemoJBenchmark compares the time taken by two methods by overriding firstMethod() and secondMethod() of JBenchmark. The first method concatenates 1,000 strings
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using the string concatenation approach, and the second does the same using the StringBuffer class s append method. import book.util.JBenchmark; public class DemoJBenchmark extends JBenchmark { public static void main(String[] args) throws Exception { new DemoJBenchmark()._runBenchmark(); } public void firstMethod() throws Exception { String x = ""; for( int i=0; i < 1000; i++ ) x = x + Integer.toString(i); } public void secondMethod() throws Exception { StringBuffer x = new StringBuffer(); for( int i=0; i < 1000; i++ ) x.append( Integer.toString(i) ); String y = x.toString(); } private void _runBenchmark() throws Exception { timeMethod( JBenchmark.FIRST_METHOD, null, null, "Concatenating Using String"); timeMethod( JBenchmark.SECOND_METHOD, null, null, "Concatenating Using StringBuffer"); } Sample output when I ran the program DemoJBenchmark is as follows. It indicates (as expected) that StringBuffer-based concatenation outperforms string concatenation. Concatenating Using String On an average it took 66 ms (number of runs = 1910.) Concatenating Using StringBuffer On an average it took 1 ms (number of runs = 150000.)
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A Utility to Pause in a Java Program
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Listing 1-1 shows a utility that I use in some of my programs to generate a pause. I use it when I want to run something separately (e.g., a query to some tables being modified by the program), but want to do so at intermediate stages in the program. The program uses standard Java I/O classes in the overloaded method waitTillUserPressesEnter().
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Listing 1-1. The InputUtil class generates a pause in Java programs package book.util; import java.io.IOException; import java.io.BufferedReader; import java.io.InputStreamReader; public class InputUtil { public static void main(String[] args) throws Exception { String line = waitTillUserHitsEnter(); System.out.println( line ); } public static String waitTillUserHitsEnter( String message ) throws IOException { System.out.println( message ); return waitTillUserHitsEnter(); } public static String waitTillUserHitsEnter() throws IOException { System.out.println("Press Enter to continue..." ); BufferedReader standardInput = new BufferedReader( new InputStreamReader( System.in ) ); String line = null; line = standardInput.readLine(); return line; } }
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This chapter covered some of the tools that we will use throughout this book, mainly in our performance benchmark programs. Many of these tools involve concepts that are explained in the references provided where the tool was mentioned. Some of these tools are written using JDBC concepts, which are explained elsewhere in this book. I recommend revisiting the code for these utilities once you ve grasped the underlying concepts from the later chapters. In the next chapter, we ll look at some of the fundamental concepts related to Oracle that every Oracle application programmer (including JDBC programmers) should be familiar with.
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