package sample.cluster.simple;
import akka.actor.UntypedActor;
import akka.cluster.Cluster;
import akka.cluster.ClusterEvent.CurrentClusterState;
import akka.cluster.ClusterEvent.MemberEvent;
import akka.cluster.ClusterEvent.MemberUp;
import akka.cluster.ClusterEvent.MemberRemoved;
import akka.cluster.ClusterEvent.UnreachableMember;
import akka.event.Logging;
import akka.event.LoggingAdapter;
public class SimpleClusterListener2 extends UntypedActor {
LoggingAdapter log = Logging.getLogger(getContext().system(), this);
Cluster cluster = Cluster.get(getContext().system());
//subscribe to cluster changes
@Override
public void preStart() {
//#subscribe
cluster.subscribe(getSelf(), MemberEvent.class, UnreachableMember.class);
//#subscribe
}
//re-subscribe when restart
@Override
public void postStop() {
cluster.unsubscribe(getSelf());
}
@Override
public void onReceive(Object message) {
if (message instanceof CurrentClusterState) {
CurrentClusterState state = (CurrentClusterState) message;
log.info("Current members: {}", state.members());
} else if (message instanceof MemberUp) {
MemberUp mUp = (MemberUp) message;
log.info("Member is Up: {}", mUp.member());
} else if (message instanceof UnreachableMember) {
UnreachableMember mUnreachable = (UnreachableMember) message;
log.info("Member detected as unreachable: {}", mUnreachable.member());
} else if (message instanceof MemberRemoved) {
MemberRemoved mRemoved = (MemberRemoved) message;
log.info("Member is Removed: {}", mRemoved.member());
} else if (message instanceof MemberEvent) {
// ignore
} else {
unhandled(message);
}
}
}