Regarding When-timer-expired trigger

Question

Hi,
My requirement is to display time .From my understanding i think every time
when-timer-expired shuttle between client and middle tier for this purpose for
every expiry of time .This i feel degrades the performance.
Is there any workaround available so that the database time is fetched for the first
time and thereafter refreshing could takeplace in the client-side
Thanks in advance
regards,
prabakaran.s

Answer 1

Here is the code:
package oracle.forms.fd;
import java.awt.AWTEventMulticaster;
import java.awt.Color;
import java.awt.Cursor;
import oracle.forms.handler.IHandler;
import oracle.forms.properties.ID;
import oracle.forms.ui.VTextField;
   * A PJC to have a textfield blinking
   * @author Francois Degrelle
   * @version 1.0
  public class BlinkTextField extends VTextField  implements Runnable
    public final static ID START        = ID.registerProperty("START"); 
    public final static ID STOP         = ID.registerProperty("STOP"); 
    public final static ID SETBLINKRATE = ID.registerProperty("SETBLINKRATE");   
    public final static ID SETFGCOLOR   = ID.registerProperty("SETFGCOLOR");   
    public final static ID SETBGCOLOR   = ID.registerProperty("SETBGCOLOR");       
    static Thread runner ;
    protected int seconds   = 400 ;  // milliseconds
    private Color  cdefFG   = null ; // default background color
    private Color  cdefBG   = null ; // default foreground color
    private Color  cFore    = null ; // blinking foreground color
    private Color  cBack    = null ; // blinking background color
    private boolean bSwitch = true ;
    private   IHandler  m_handler; 
    public BlinkTextField ()
       super();
    public void init(IHandler handler)
      m_handler = handler;
      super.init(handler);
      cdefFG = this.getForeground() ;
      cdefBG = this.getBackground() ;
     * switch color to simulate the blinking process
    public void run()
      Thread theThread = Thread.currentThread();
      while (runner == theThread)
        try{
        Thread.sleep(seconds);
        } catch (InterruptedException e) { }
        if(bSwitch)
          if(cBack != null) this.setBackground(cBack);
          if(cFore != null) this.setForeground(cFore);
        else
          this.setBackground(cdefBG);       
          this.setForeground(cdefFG);
        bSwitch = ! bSwitch ;
    private void startTimer()
      if (runner == null )
        runner = new Thread(this);
        runner.start();
    private static void stopTimer()
      if (runner != null )
        runner = null;
    public boolean setProperty(ID property, Object value)
      if (property == START)  // start the blinking
        startTimer() ;
        System.out.println("** Start **");
        return true;
      if (property == STOP)  // stop the blinking
        System.out.println("** Stop **");
        stopTimer() ;
        return true;
      else if (property == SETBLINKRATE)  // set the cursor blink rate
        int i = Integer.parseInt(value.toString());
        seconds=i;
        System.out.println("** SetRate="+seconds+ " miliseconds");
        return true;
      else if (property == SETFGCOLOR)  // set the foreground color
        cFore = getColor(value.toString()) ;
        System.out.println("** SetFGColor="+cFore);
        return true;
      else if (property == SETBGCOLOR)  // set the background color
        cBack = getColor(value.toString()) ;
        System.out.println("** SetBGColor="+cBack);
        return true;
      else
       return super.setProperty(property, value);
// expects r,g,b values separated by commas 
public Color getColor(String colourValue)
  try{     
    int r,g,b;     
    int rPos, gPos;     
    rPos = colourValue.indexOf(",");     
    gPos = colourValue.indexOf(",", rPos + 1);     
    if (rPos < 1 || gPos < 1 || gPos + 1 == colourValue.length()) {       
        throw new Exception("Invalid colour");
    r = Integer.parseInt(colourValue.substring(0, rPos));     
    g = Integer.parseInt(colourValue.substring(rPos + 1, gPos));     
    b = Integer.parseInt(colourValue.substring(gPos + 1));       
    if (r < 0 || r > 255 || g < 0 || g > 255 || b < 0 || b > 255) {       
       throw new Exception("Invalid colour");
    return new Color(r,g,b);
  catch(Exception e) {     
    return new Color(0,0,0);
}Francois