Scheduled check ...

[Kuba Bernatowicz]

Hi,

First of all Hi to everyone, as this is my first post here !

I'm writing (trying) a simple java app that could make a db query, fetch result and display message on the screen ... and do it every 5 min .
I've got everything working except those 5 min ...
I need to pause timer somehow, and start next delay (period) again only after a button has been pressed.
Now if I don't press OK button for let's say 2h, I'll need to press it about 24 (2h/5min delay) times ...
I hope I made myself clear ...

Can anyone give me an advice?
Is java.util.Timer a good solution ?

This is how my code looks like now :

package scheduledCheck.my.project;
 
import ...
 
public class AgentSwing {
 
        public static void main(String[] args) {
                int delay = 1000; // delay for 1 sec.
                int period = 15000; // repeat every 15 sec. ..or 5min
               
                java.util.Timer timer = new Timer();
                timer.scheduleAtFixedRate(new TimerTask(){
                        public void run()
                        {
                                doIt();               
                        }
                }, delay, period);
        }
 
        public static void doIt() {
                String message="";
                // here are my db connection and checks and if i've got a result 
                // i store it in message, 
 
                JFrame frame = new JFrame("");
                if (message.equals(""))
                  message = "";
                  // no message
                else {
             message="Message...";                                                 
                    JOptionPane.showMessageDialog(frame, message);
                };
        }
 
               
} 

Kuba

[Martijn Verburg]

Hi Kuba and welcome to Javaranch! Can I ask what version of the JDK you are using?

[Kuba Bernatowicz]

Hi,

Sorry, I forgot about it.

JDK1.6.0_07

[Ove Lindström]

Then you should take a look at the java.util.concurrent package and the class ScheduledExecutorService.

There you find what you are looking for. Using timers is "old school".

Also... never EVER do any real work in the main-method. That method is there to initiate the real work and should only contain the code needed to start your application (reading application properties, setting up loggers, setting up data sources and stuff like that).
[ December 05, 2008: Message edited by: Ove Lindstr�m ]

[Kuba Bernatowicz]

Thanks Ove,

I googled :
http://gallemore.blogspot.com/2007/05/java-threading-scheduledexecutorservice.html

and last example is just what I needed.