Distributed work queue primitive

Change-Id: Ia8e531e6611ec502399edec376ccc00522e47994
diff --git a/apps/vtn/vtnrsc/src/test/java/org/onosproject/vtnrsc/util/VtnStorageServiceAdapter.java b/apps/vtn/vtnrsc/src/test/java/org/onosproject/vtnrsc/util/VtnStorageServiceAdapter.java
index 6189ec8..b8ad5d0 100644
--- a/apps/vtn/vtnrsc/src/test/java/org/onosproject/vtnrsc/util/VtnStorageServiceAdapter.java
+++ b/apps/vtn/vtnrsc/src/test/java/org/onosproject/vtnrsc/util/VtnStorageServiceAdapter.java
@@ -15,6 +15,7 @@
  */
 package org.onosproject.vtnrsc.util;
 
+import org.onosproject.store.service.WorkQueue;
 import org.onosproject.store.service.EventuallyConsistentMapBuilder;
 import org.onosproject.store.service.ConsistentMapBuilder;
 import org.onosproject.store.service.DistributedSetBuilder;
@@ -22,6 +23,7 @@
 import org.onosproject.store.service.AtomicCounterBuilder;
 import org.onosproject.store.service.AtomicValueBuilder;
 import org.onosproject.store.service.LeaderElectorBuilder;
+import org.onosproject.store.service.Serializer;
 import org.onosproject.store.service.TransactionContextBuilder;
 import org.onosproject.store.service.StorageService;
 
@@ -68,4 +70,9 @@
     public LeaderElectorBuilder leaderElectorBuilder() {
         return null;
     }
+
+    @Override
+    public <E> WorkQueue<E> getWorkQueue(String name, Serializer serializer) {
+        return null;
+    }
 }