CODEWITHSUNDEEP
javaconcurrencytimerejb
user3189663
user3189663

Reputation: 211

ScheduledExecutorService To Run Every Few Seconds

I am trying to use the ScheduledExecutorService to run every few seconds in EJB. However, it does seem to work. I am not sure if I am doing anything wrong. I found this website: http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ScheduledExecutorService.html.

I want to run some code every few seconds. I am not sure whether this is concurrency because I want to execute only on one Thread that runs repeately. Below is the code:

@Startup
@Singleton
public class StartUp {

    private ScheduledExecutorService executor;

    @PostConstruct
    public void start() {
         executor = Executors.newScheduledThreadPool(1);
         Runnable runnable = new Runnable() {
             public void run() {
                 while(true) {
                     System.out.println("i");
                     // after send an e-mail
                 }
             }
         };
         ScheduledFuture<?> scheduledFuture = executor.scheduleAtFixedRate(runnable, 0, 1, TimeUnit.SECONDS);
    }
}

This does not seem to run. What am I doing wrong?

Any ideas?

Upvotes: 1

Views: 1389

Answers (1)

Danix
Danix

Reputation: 1947

When using EJBs you shouldn't create your own thread pool, but let the container do that for you. You should have something similar to:

@Singleton
public class TimerService {
    @EJB
    HelloService helloService;

    @Schedule(second="*/1", minute="*",hour="*", persistent=false)
    public void doWork(){
        System.out.println("timer: " + helloService.sayHello());
    }
}

Upvotes: 3

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