Provide a way to execute some logic when the HTTP server is started

[mkouba]

Description

StartupEvent/@Startup does not help because the CDI event is fired before the HTTP server is started.

The only workaround I can think of is to schedule a task in a StartupEvent/@Startup to execute some logic with a delay, e.g. something like:

class MyBean {

   @Inject
   ScheduledExecutorService executor;

   @Startup
   void init() {
      executor.schedule(new Task(), 500, TimeUnit.MILLISECONDS);
   }
}

and non-blocking variant:

class MyBean {

   @Inject
   Vertx vertx;

   @Startup
   void init() {
      vertx.setTimer(500, new Handler());
   }
}

This is of course not reliable at all because of the hard-coded delay.

Implementation ideas

We could fire a specific CDI event, or introduce a special interface to be implemented by beans (e.g. HttpServerListener) and called when the server is listening. I'm proposing a CDI-specific API because that's what Quarkus users are used to do.

[geoand]

+1 for this. I'm pretty sure we've heard of similar requests in the past.

The one complication I can think of is that we would need to provide enough context so the users knows whether it's the HTTP or HTTPS server being started

[mkouba]

The one complication I can think of is that we would need to provide enough context so the users knows whether it's the HTTP or HTTPS server being started

Yes, I was thinking of separate events/methods for HTTP and HTTPS...