A simple Waba performance test.

POWER JAVA
Java on the Palm Pilot

Gernot Starke
Listing 1. A simple Waba performance test.


/*
PerformanceEvaluation.java
*/

import waba.ui.*;
import waba.fx.*;
import Timer;

public class PerformanceEvaluation extends MainWindow {
  ResultPanel resPanel;
  Button closeButton, againButton;

public void onEvent(Event event) 	{
  if (event.type == ControlEvent.PRESSED)  {
		if (event.target == closeButton)
			exit(0);
		else if (event.target == againButton) 	{
			resPanel.repaint();
		};
	
	}
}

public void onStart() {
	// create user-interface
	Title title = new Title("Waba Performance Evaluation");
	title.setRect(0, 0, this.width, 15);
	add(title);

	// Output-Panel 
	resPanel = new ResultPanel();
	resPanel.setRect(5, 20, this.width - 10, this.height - 40);
	add(resPanel);

	// 2 Buttons
	closeButton = new Button("Close");
	closeButton.setRect(0, this.height - 15, 44, 15);
	add(closeButton);
	againButton = new Button("Start");
	againButton.setRect(46, this.height - 15, 44, 15);
	add(againButton);
	}
}

/*
ResultPanel.java
*/

import waba.ui.*;
import waba.fx.*;
import PerformanceTester;

/**
 * A container displaying performance results.
 */

public class ResultPanel extends Container {
	Font font;

public ResultPanel() 	{
	font = new Font("Helvetica", Font.PLAIN, 12);
}

public void onPaint(Graphics g) 	{
	g.setFont(font);
	g.setColor(0, 0, 0);

	// begin with Integer Arithmetic test
	g.drawText(PerformanceTester.doIntegerArithmeticTest( 10000 ),
                                                              0, 5);

	// then perform float arithmetic test
	g.drawText(PerformanceTester.doFloatArithmeticTest(5000), 0, 20);

	// String test
	g.drawText( PerformanceTester.doStringTest( 200), 0,35);
	}
}


/**
 * PerformanceTester implements some testing algorithms.
 * gs, 11.Dec.1999
 *
 */

import waba.sys.Convert;

public class PerformanceTester {
    static Timer l_timer = new Timer();

public PerformanceTester() { super(); }

private static String assembleResults( String nameOfTest, int bound) {
	return Convert.toString( bound ) + " " + nameOfTest
	                            + " ops: "
	                            + l_timer.getTimeDifference() + " ms";
}

public static String doFloatArithmeticTest( int bound)  {
	l_timer.startTimer();
	int i=0;
	float f = 1.21f;
	float f2 = 5.141592f;
	
	for (i=0; i<bound; i++)  	{
		f2 = f2-f;
		f2 = f2*f;
	}
	l_timer.stopTimer();
	return assembleResults( "Float", bound );
} // doFloatArithmeticTest
public static String doIntegerArithmeticTest( int bound) {
	l_timer.startTimer();

	int i, j=0;
	for (i=0; i<bound; i++)  j = j+i;
	
	l_timer.stopTimer();

	return assembleResults( "Integer", bound );
}

public static String doStringTest( int bound) {
	l_timer.startTimer();

	int i=0;
	String s = "";
	
	for (i=0; i<bound; i++) {
		if (s.length() > 1000)
			s = "";
		else s = s + "a";
	}
	l_timer.stopTimer();

	return assembleResults( "String", bound );
} // doStringTest

 }

/**
 * Timer implements a "stopwatch" class for the Waba VM.
 * Can only measure differences <= 24hours.
 * Gets time info from Waba-class VM
 */

import waba.sys.Time;
import waba.sys.Vm;
import waba.sys.Convert;

public class Timer {
	private boolean started;
	private int startTime;
	private int stopTime;

public Timer() { started = false; }

public String getTimeDifference() {
	int timeDiff = stopTime - startTime;
	return Convert.toString(timeDiff);
}

public void startTimer() {
	startTime = Vm.getTimeStamp();
	started = true;
}

public void stopTimer() {
	stopTime = Vm.getTimeStamp();
	started = false;
}

} // class Timer

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