PAL.C.T MINI SHELL
import java.awt.*;
import java.net.*;
import java.io.*;
import java.util.*;
import java.applet.*;
public class Tracer extends Applet implements Runnable,CbButtonCallback
{
MultiColumn log;
StringBuffer logbuffer = new StringBuffer();
LineInputStream is;
Thread th;
CbButton pause, button;
boolean paused = false;
int MAX_ROWS = 1000;
Vector buffer = new Vector();
public void init()
{
// Create the UI
setLayout(new BorderLayout());
String cols[] = { "Time", "System Call", "Parameters", "Return" };
add("Center", log = new MultiColumn(cols));
float widths[] = { .1f, .15f, .65f, .1f };
log.setWidths(widths);
Util.setFont(new Font("TimesRoman", Font.PLAIN, 12));
Panel bot = new Panel();
bot.setBackground(Color.white);
bot.setForeground(Color.white);
bot.setLayout(new FlowLayout(FlowLayout.RIGHT));
bot.add(pause = new CbButton(" Pause ", this));
add("South", bot);
}
public void start()
{
// Start download thread
log.clear();
th = new Thread(this);
th.start();
}
public void stop()
{
// Stop download
try {
String killurl = getParameter("killurl");
if (killurl != null) {
// Call this CGI at stop time
try {
URL u = new URL(getDocumentBase(), killurl);
URLConnection uc = u.openConnection();
String session = getParameter("session");
if (session != null)
uc.setRequestProperty("Cookie", session);
uc.getInputStream().close();
}
catch(Exception e2) { }
}
if (is != null) is.close();
if (th != null) th.stop();
}
catch(Exception e) {
// ignore it
e.printStackTrace();
}
}
public void run()
{
try {
URL u = new URL(getDocumentBase(), getParameter("url"));
URLConnection uc = u.openConnection();
String session = getParameter("session");
if (session != null)
uc.setRequestProperty("Cookie", session);
is = new LineInputStream(uc.getInputStream());
while(true) {
StringSplitter tok =
new StringSplitter(is.gets(), '\t', false);
if (tok.countTokens() == 4) {
Object row[] = { tok.nextToken(),
tok.nextToken(),
tok.nextToken(),
tok.nextToken() };
if (paused) {
// Store in temp buffer
buffer.addElement(row);
if (buffer.size() > MAX_ROWS) {
buffer.removeElementAt(0);
}
}
else {
// Add immediately
log.addItem(row);
cleanup();
log.scrollto(log.count()-1);
}
}
}
}
catch(EOFException e) {
// end of file ..
}
catch(IOException e) {
// shouldn't happen!
e.printStackTrace();
}
}
void cleanup()
{
while(log.count() > MAX_ROWS) {
log.deleteItem(0);
}
}
public void click(CbButton b) {
if (b == pause) {
if (paused) {
// Resume display, and add missed stuff
pause.setText(" Pause ");
for(int i=0; i<buffer.size(); i++) {
Object row[] =
(Object[])buffer.elementAt(i);
log.addItem(row);
}
cleanup();
log.scrollto(log.count()-1);
buffer.removeAllElements();
} else {
// Stop display
pause.setText("Resume");
}
paused = !paused;
}
}
}
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