functional stats service

Change-Id: I90de3aa5d7721db8ef6a154e122af8b446243f60
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/statistic/impl/StatisticStoreMessageSubjects.java b/core/store/dist/src/main/java/org/onlab/onos/store/statistic/impl/StatisticStoreMessageSubjects.java
new file mode 100644
index 0000000..a096a3d
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/statistic/impl/StatisticStoreMessageSubjects.java
@@ -0,0 +1,15 @@
+package org.onlab.onos.store.statistic.impl;
+
+import org.onlab.onos.store.cluster.messaging.MessageSubject;
+
+/**
+ * MessageSubjects used by DistributedStatisticStore peer-peer communication.
+ */
+public final class StatisticStoreMessageSubjects {
+    private StatisticStoreMessageSubjects() {}
+        public static final MessageSubject GET_CURRENT =
+                new MessageSubject("peer-return-current");
+        public static final MessageSubject GET_PREVIOUS =
+            new MessageSubject("peer-return-previous");
+
+}