Event Queue subscribe and ViewModel re-init

asked 2015-07-20 16:40:38 +0800

WilliamB
1609 ● 1 ● 6

updated 2015-07-21 10:25:39 +0800

I used Event queue to communicate between View Models as I cannot use GlobalCommand that would trigger multiple instances of one of my ViewModel.

I'm using a different event queue for each of my instance and it works fine. In the Init, I lookup that event queue and also subscribe to a new SerializableEventListener<event>.

@Init(superclass = true)
public void init() {
    eq = EventQueues.lookup(tabEventQueue);

    eq.subscribe(new SerializableEventListener<Event>() {

        private static final long serialVersionUID = 1L;

        @Override
        public void onEvent(final Event pEvent) throws Exception {

            if (pEvent.getName().equals(MY_EVENT_NAME)) {
                // Do something
            }
        }
    });
}

However when the use navigate in my application, he ll rego through init if he leave the page and comes back. Thus I end up subscribing multiple time to the event.

How can I avoid that multiple register?