How to use thread pool in glassfish

Question

I am using jdk 1.6 with glassfish 2.1
in admin console i found threadpools under Configuration> Thread Pools
my questions are
is this thread pool is accessible to programmers (just like in websphere threadpool is accessible to programmers through work manager and asynch beans)
can I do the same thing using glassfish (eg. WorkManager wm = new WorkManager(_threadpool_) )
or is there any other way to do this.
Is there any way to use the threads in the threadpool to run some batch job in parallel?
what exactly the purpose of this threadpool in glassfish, I mean it used internally bu glassfish or programmers have to use it explicitly in there code

Answer 1

It is pretty straight forward. You just create an executor instance and feed it runnable objects. For example:
import java.util.concurrent.*;
public class ExecutorExample {
    static class Worker implements Runnable {
        public Worker(int id) {
            this.id = id;
        public void run() {
            for(int i = 0; i < 100; i++) {
                System.out.printf("Thread %d iteration %d of 100%n", id, i);
                try {
                    Thread.sleep(100);
                catch(Exception e)
        private int id;
    public static void main(String[] args) {
        BlockingQueue<Runnable> queue = new ArrayBlockingQueue<Runnable>(200);
        Executor e = new ThreadPoolExecutor(10, 10, 1, TimeUnit.SECONDS, queue);
        System.out.println("Creating workers");
        for(int i = 0; i < 20; i++)
            e.execute(new Worker(i));
        System.out.println("Done creating workers");
}