David Van Couvering wrote:
> Hi, all. I have written a v3 module that I'd like to run on startup.
> What's the recommended way to do this?
>
> Right now I do this.
>
> import org.glassfish.api.Startup;
> import org.jvnet.hk2.annotations.Service;
>
> @Service(name="twibber")
> public class Twibber implements Startup, Runnable
> {
> public Lifecycle getLifecycle() {
> return Lifecycle.SERVER;
> }
> public Twibber() {
> new Thread(this).start();
> }
> public void run() {
> // ... Do the actual work here
> }
> }
>
>
> It works, but I am concerned it's not the intended approach. What's
> the *right* way to run the service? Is it really to spawn the thread
> in the constructor? And how do I catch a shutdown event?
Sahoo was right when saying you should use postContruct rather than the
constructor, the reason is that anything injected is not available at
the constructor time but at the postConstruct. Also if you just want to
have your service to be asynchronous, the simplest way to do that is :
@Service(name="twibber")
@Async
public class Twibber implements Startup, PostConstruct
{
public Lifecycle getLifecycle() {
return Lifecycle.SERVER;
}
public void postConstruct() {
// ... Do the actual work here
}
}
As for getting notified when the serve shutsdown.
look at org.glassfish.api.eveni.Events in glassfish-api module, this
will allow you to receive shutdown notification.
however, the simplest way is just to implement the preDestroy() method...
jerome
>
> I suspect there's something I'm missing...
>
> Thanks,
>
> David
>
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