How to send "processing" message to user while working

          Here is a complete example of a servlet kicking off long-running task and displaying messages about it's progress (without creating new threads and without using JMS):
          Test.java:
          import java.io.*;
          import java.util.*;
          import javax.servlet.*;
          import javax.servlet.http.*;
          import weblogic.time.common.*;
          import weblogic.common.*;
          import weblogic.jndi.*;
          import javax.naming.*;
          * execute stuff on weblogic's execute threads
          * usage:
          * <pre>
          * class Foo implements Runnable {
          * public void run() {
          * Foo foo = new Foo(...);
          * MyThread thr = new MyThread(foo);
          * thr.start();
          * </pre>
          class MyThread implements Schedulable, Triggerable {
          boolean done = false;
          Runnable runnable = null;
          ScheduledTriggerDef std;
          public void run() {
               if(runnable != null) {
               runnable.run();
          public MyThread() {
          public MyThread(Runnable runnable) {
               this.runnable = runnable;
          public boolean start() {
               boolean ok = false;
               try {
               T3ServicesDef t3 = (T3ServicesDef)(new InitialContext()).lookup("weblogic.common.T3Services");
               std = t3.time().getScheduledTrigger(this, this);
               std.schedule();
               ok = true;
               } catch(NamingException ne) {
               System.out.println(ne.getMessage());
               } catch(TimeTriggerException tte) {
               System.out.println(tte.getMessage());
               return ok;
          public void trigger(Schedulable sched) {
               try {
               run();
               } catch(Throwable t) {
               System.out.println(t);
               done = true;
          public long schedule(long time) {
               return done ? 0 : time;
          class LongTask implements Runnable {
          public int status = 0;
          public long timeStarted;
          public long timeCompleted;
          int seconds;
          LongTask(int seconds) {
               this.seconds = seconds;
          public void run() {
               status = 1;
               timeStarted = System.currentTimeMillis();
               try {
               // simulate long running process
               Thread.sleep(seconds * 1000);
               } catch(InterruptedException ie) {}
               timeCompleted = System.currentTimeMillis();
               status = 2;
          public class Test extends HttpServlet {
          public void service(HttpServletRequest req, HttpServletResponse res)
               throws ServletException, IOException {
               String msg = null;
               HttpSession session = req.getSession();
               LongTask longTask = (LongTask)session.getAttribute("longTask");
               if(longTask == null) {
               session.setAttribute("longTask", longTask = new LongTask(10));
               (new MyThread(longTask)).start();
               switch(longTask.status) {
               case 0:
               msg = "Waiting";
               break;
               case 1:
               msg = "In progress";
               break;
               case 2:
               msg = "Done, started:" + longTask.timeStarted + " completed:" + longTask.timeCompleted;
               session.removeAttribute("longTask");
               break;
               PrintWriter out = new PrintWriter(new OutputStreamWriter(res.getOutputStream()));
               res.setContentType("text/html");
               out.println("<html><body>");
               out.println("Your request status:" + msg);
               out.println("</body></html>");
               out.flush();
               out.close();
          Dimitri

Cool.
          Cameron Purdy
          [email protected]
          http://www.tangosol.com
          WebLogic Consulting Available
          "Dimitri Rakitine" <[email protected]> wrote in message
          news:39e21527$[email protected]..
          >
          > That didnt look very good, so here it is:
          > http://dima.dhs.org/misc/LongRunningTask.html
          >
          > Dimitri

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Edited by: CraigB on Jun 14, 2010 4:49 PM
Edited by: CraigB on Jun 14, 2010 4:49 PM
Edited by: CraigB on Jun 14, 2010 4:50 PM
Edited by: CraigB on Jun 14, 2010 4:51 PM
Edited by: CraigB on Jun 14, 2010 4:51 PM

Send Process Message Error

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