Hello all,
I'm developing the java applet to received the numerical data from socket and then plot it with jfreechart. I used java thread to poll the socket via readline. This java applet contains in the Embedded Web server of Wiport (The Serial to WiFi Module). I've a problem of
1. Delayed of reading the data from socket which
when I turned the Wiport off (No power supplied). The applet still plot the graph if the data come so many.My data arrival rate to the applet is 57600 bps. My thread read period is thread.sleep(0,(int)read_period); (read_period = 50)
2. Are there any method to improve the speed of read the data ? or Any suggestion of my method?
3. Can socket wait with timeout? e.g. readline with timeout, read with timeout
My thread source code is here
public void run() {
String s=null;
int i=0;
double min=0,max=0,data=0;
s = new String();
while(true){
while(connected){
// graph get data
try {
s = in.readLine();
data = Double.valueOf(s.trim()).doubleValue();
debugLabel.setText("" + data); // print received
if(data>=max) max = data;
if(data<=min) min = data;
// graph plot
if(duration>setduration){
// clear old data
for(int j=0; j<duration;j++)
dataset.getSeries(0).getDataItem(j).setY(0);
// set new duration
duration = setduration;
if(i>=duration) i = 0;
}
if(i>=duration){
if(setduration<=duration){
i=0;
// clear old data
for(int j=0; j<duration;j++)
dataset.getSeries(0).getDataItem(j).setY(0);
} else if(i >= setduration){
i=0;
// clear old data
for(int j=0; j<duration;j++)
dataset.getSeries(0).getDataItem(j).setY(0);
duration = setduration;
} else {
// plot in the case : new series period
series.add(i,data);
Yaxis.setRangeWithMargins(min,max);
dataset.getSeries(0).getDataItem(i).setY(data);
chartPanel.firePropertyChange("w",true,true);
chartPanel.repaint();
i++;
}
} else {
// plot in the case : update old series
Yaxis.setRangeWithMargins(min,max);
dataset.getSeries(0).getDataItem(i).setY(data);
chartPanel.firePropertyChange("a",true,true);
chartPanel.repaint();
i++;
}
} catch (IOException ex) {
ex.printStackTrace();
debugLabel.setText("Connection Timeout");
connected = false;
}
// read sampling period
try {
thread.sleep(0,(int)read_period);
} catch (InterruptedException ex) {
ex.printStackTrace();
}
}
if(!connected){
statusLabel.setText("Reconnecting");
try {
thread.sleep(0,5000);
} catch (InterruptedException ex) {
ex.printStackTrace();
}
initial();
}
}
If you want more information please tell me
Thank you in advanced
ukyo yagamura
Linear Mode
