Wow. Thanks for the quick response!!
I didn’t see the `forServers()` before. That is great.
And I like the idea of sharing the state directly in a “flags” cache.
Great idea.
In my case, I also want to continually monitor the “expected number of
Servers”, so that I can send Alerts as Nodes inevitably come and go in AWS.
But I can use this same idea and provide another Listener that sends an Alert
(or logs an ERROR, etc.)
Good stuff!
Thank you again,
— Chris
> On Jul 10, 2017, at 2:55 AM, dkarachentsev [via Apache Ignite Users]
> wrote:
>
> Hi Chris,
>
> You understand correctly that you need to subscribe for node joined event.
> Here is possible example of how to write it:
>
> private static class Listener implements IgnitePredicate {
>
> @IgniteInstanceResource
> private Ignite ignite;
>
> @Override public boolean apply(Event evt) {
> int size = ignite.cluster().forServers().nodes().size(); // check
> cluster size for servers only
>
> if (size == 10) {
> // Generate ready event only once
> if (ignite.cache("flags").putIfAbsent("gridReady", true))
> System.out.println("Got expected size");
>
> // Unsubscribe
> return false;
> }
>
> return true;
> }
> }
>
> And configuration:
>
> Map, int[]> listeners = new
> HashMap<>();
>
> listeners.put(new Listener(), new int[]{EventType.EVT_NODE_JOINED});
>
> cfg.setLocalEventListeners(listeners);
>
> cfg.setCacheConfiguration(new CacheConfiguration("flags"));
>
> Thanks!
> -Dmitry
>
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