VM Performance: Calling javascript functions from Applet

**SPG** · Jul 23 '05, 04:15 PM

Re: VM Performance: Calling javascript functions from Applet

Hi,

OK, Below is a quick sample.. A bit nasty code-wise but sort of highlights
what we are doing in a very rough way.
I have two message pumps to simulate multiple threads updating prices...

We find the MS VM to be far more performant than the SUN version...
It would be really great if we could at least find out why the sun vm is so
poor at handling this, so we can start rectifying our mistakes!

Steve

<snip code="applet code">
import java.awt.*;
import java.awt.event. *;
import java.applet.*;
import netscape.javasc ript.*;
import java.util.*;

public class LoadTest
extends Applet {

private String jsFunction = "handleUpda te";
private JSObject win;
MessagePump pump1;
MessagePump pump2;

//Construct the applet
public LoadTest() {
}

//Initialize the applet
public void init() {
try {
win = JSObject.getWin dow(this);
pump1 = new MessagePump((in t)(Math.random( )*500)+300);
pump1.start();
pump2 = new MessagePump((in t)(Math.random( )*500)+300);
pump2.start();
}
catch (Exception e) {
e.printStackTra ce();
}
}

public void destroy(){
pump1.interrupt ();
pump2.interrupt ();
super.destroy() ;

}

private void sendUpdate(fina l Message m){
try{
final Object[] params = new Object[]{m};
win.call(jsFunc tion, params);
}catch(Exceptio n err){}
}

private class MessagePump extends Thread{
private long _wait;
public MessagePump(lon g wait){
_wait = wait;
}
public void run(){
while(! interrupted()){
for(int i=0; i < 20; i++){
Message m = new Message("" + (i+1), "" +
(Math.random()* 100),"" + (Math.random()* 100),new Date());
sendUpdate(m);
}
try {
Thread.sleep(_w ait);
}
catch (InterruptedExc eption ex) {
}
}
}
}

}
</snip>
<html>
<head>
<title>
HTML Test Page
</title>
<SCRIPT language="JavaS cript">
function handleUpdate(ms g)
{
try{
var id = msg.getID();
var date = msg.getDate();
var bid = msg.getBid();
var ask = msg.getAsk();

var table = document.getEle mentById("Price s");
var row = table.rows[id];

row.cells[0].firstChild.nod eValue = id;
row.cells[1].firstChild.nod eValue = date;
row.cells[2].firstChild.nod eValue = bid;
row.cells[3].firstChild.nod eValue = ask;
}catch(e)
{
alert(e);
}

}
</SCRIPT>
</head>
<body>
<h1>Using Direct Access</h1>
<table border=1 id="Prices">
<thead id="Title">
<tr>
<th>ID</th>
<th>Date</th>
<th>Bid</th>
<th>Ask</th>
</tr>
</thead>
<tr id="1">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="2">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="3">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="4">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="5">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="6">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="7">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="8">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="9">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="10">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="11">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="12">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="13">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="14">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="15">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="16">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="17">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="18">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="19">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
<tr id="20">
<td id="ID">  </td>
<td id="DATE">&nbsp ;</td>
<td id="BID">  </td>
<td id="ASK">  </td>
</tr>
</table>
<applet
codebase = "."
code = "LoadTest.class "
name = "TestApplet "
width = "0"
height = "0"
hspace = "0"
vspace = "0"
align = "middle"
MAYSCRIPT[color=blue]
>[/color]
</applet>
</body>
</html>

<snip code="html">

</snip>

VM Performance: Calling javascript functions from Applet

VM Performance: Calling javascript functions from Applet

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