X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?p=controller.git;a=blobdiff_plain;f=opendaylight%2Fmd-sal%2Fsal-distributed-datastore%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fcontroller%2Fcluster%2Fdatastore%2FClusterWrapperImpl.java;h=8910137ec4583272b55ead555b0ed12e11caa02c;hp=142aacde65c32f1050846810c8d33b1c9122be55;hb=5834673a28941e470173b5215f56cebdf0cfa2f0;hpb=0eb621d29daaf08979c356e2148e99c48458e169

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ClusterWrapperImpl.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ClusterWrapperImpl.java
index 142aacde65..8910137ec4 100644
--- a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ClusterWrapperImpl.java
+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ClusterWrapperImpl.java
@@ -12,18 +12,31 @@ import akka.actor.ActorRef;
 import akka.actor.ActorSystem;
 import akka.cluster.Cluster;
 import akka.cluster.ClusterEvent;
+import com.google.common.base.Preconditions;
 
 public class ClusterWrapperImpl implements ClusterWrapper {
     private final Cluster cluster;
     private final String currentMemberName;
 
     public ClusterWrapperImpl(ActorSystem actorSystem){
+        Preconditions.checkNotNull(actorSystem, "actorSystem should not be null");
+
         cluster = Cluster.get(actorSystem);
+
+        Preconditions.checkState(cluster.getSelfRoles().size() > 0,
+            "No akka roles were specified\n" +
+                "One way to specify the member name is to pass a property on the command line like so\n" +
+                "   -Dakka.cluster.roles.0=member-3\n" +
+                "member-3 here would be the name of the member"
+        );
+
         currentMemberName = (String) cluster.getSelfRoles().toArray()[0];
 
     }
 
     public void subscribeToMemberEvents(ActorRef actorRef){
+        Preconditions.checkNotNull(actorRef, "actorRef should not be null");
+
         cluster.subscribe(actorRef, ClusterEvent.initialStateAsEvents(),
             ClusterEvent.MemberEvent.class,
             ClusterEvent.UnreachableMember.class);