I have a supervisor actor per node which is already subscribed to cluster
events,
I avoided using ask when the actor system is going down anyway and it is
driven by the JVM shutdown hook,
so instead I came up with this hack, maybe a bit ugly but it works:
For supervisor actor which once it receives MemberRemoved for itself it
terminates the actor system:
if (message instanceof MemberRemoved) {
final Member member = ((MemberRemoved) message).member();
final ActorSystem system = context().system();
if (Cluster.get(system).selfAddress().equals(member.address())) {
// It was me that left so, terminate actor system.
system.terminate();
} else {
// Invalidates that other supervisor cache that left.
removeSupervisor(member);
}
}
For main class which once the system is shutdown it also shutdowns the
logger manager:
public static void registerShutdownHook(ActorSystem system) {
final CountDownLatch latch = new CountDownLatch(1);
system.registerOnTermination(() -> {
try {
Configurator.shutdown((LoggerContext) LogManager.getContext());
} finally {
latch.countDown();
}
});
Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
final Cluster cluster = Cluster.get(system);
cluster.leave(cluster.selfAddress());
try {
latch.await();
} catch (InterruptedException ignored) {
}
}
});
}
Regards,
Guido.
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