I have a singleton that needs to start a scheduled execution. This is the code:
public enum Service{
INSTANCE;
private Service() {
startAutomaticUpdate();
}
private void startAutomaticUpdate() {
try {
ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);
executor.scheduleAtFixedRate(new AutomaticUpdate(), 0, 15, TimeUnit.MINUTES);
} catch (Exception e) {
LOG.error(e.getMessage() + "Automatic update not working: ");
}
}
//Makes a call to a webservice that updates a static variable.
private void getTemplateNames(){...}
private class AutomaticUpdate implements Runnable {
public AutomaticUpdate() {
}
@Override
public void run(){
try{
getTemplateNames();
}catch(Exception e){
LOG.error("Error in automatic update: "+e.getMessage());
}
}
}
I am not sure when or if I should call the shutdown method of the executor. I'm using JEE5, so I'm not sure if simply undeploying the app will automatically execute the shutdown, or if I am messing up big time and creating a ridiculous amount of threads and not killing them.
-EDIT-
I'll add a bit more info, just in case.
The whole app is a RESTful web app using Jersey as a ServletContainer.
You said JEE5? Why you're reeinventing the wheel?
Just create a EJB with @Schedule
and @Startup
@Singleton @Startup public class TaskSingleton { @Schedule(second = "0", minute = "*/15", hour = "*")//This mean each 15:00 minutes public void getTemplateNames() { // YOUR TASK IMPLEMENTATION HERE } }
No you don't mean JEE5 complaint server. :(
Go for the implementation with a ServletContextListener. I wrote some answer like that here , It's the same idea, it does applies here.
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