Added notion of a general Store abstraction and wired it up in ClusterStore.
diff --git a/core/store/src/main/java/org/onlab/onos/store/impl/AbstractDistributedStore.java b/core/store/src/main/java/org/onlab/onos/store/impl/AbstractDistributedStore.java
index e11dda3..bca585d 100644
--- a/core/store/src/main/java/org/onlab/onos/store/impl/AbstractDistributedStore.java
+++ b/core/store/src/main/java/org/onlab/onos/store/impl/AbstractDistributedStore.java
@@ -10,7 +10,10 @@
 import org.apache.felix.scr.annotations.Component;
 import org.apache.felix.scr.annotations.Reference;
 import org.apache.felix.scr.annotations.ReferenceCardinality;
-import org.onlab.onos.store.StoreService;
+import org.onlab.onos.event.Event;
+import org.onlab.onos.store.AbstractStore;
+import org.onlab.onos.store.StoreDelegate;
+import org.onlab.onos.store.common.StoreService;
 import org.slf4j.Logger;
 
 import static com.google.common.base.Preconditions.checkNotNull;
@@ -20,7 +23,8 @@
  * Abstraction of a distributed store based on Hazelcast.
  */
 @Component(componentAbstract = true)
-public abstract class AbstractDistributedStore {
+public abstract class AbstractDistributedStore<E extends Event, D extends StoreDelegate<E>>
+            extends AbstractStore<E, D> {
 
     protected final Logger log = getLogger(getClass());
 
diff --git a/core/store/src/main/java/org/onlab/onos/store/impl/OptionalCacheLoader.java b/core/store/src/main/java/org/onlab/onos/store/impl/OptionalCacheLoader.java
index 47a42ee..dddd128 100644
--- a/core/store/src/main/java/org/onlab/onos/store/impl/OptionalCacheLoader.java
+++ b/core/store/src/main/java/org/onlab/onos/store/impl/OptionalCacheLoader.java
@@ -2,7 +2,7 @@
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
-import org.onlab.onos.store.StoreService;
+import org.onlab.onos.store.common.StoreService;
 
 import com.google.common.base.Optional;
 import com.google.common.cache.CacheLoader;
diff --git a/core/store/src/main/java/org/onlab/onos/store/impl/StoreManager.java b/core/store/src/main/java/org/onlab/onos/store/impl/StoreManager.java
index 82472b7..77463fd 100644
--- a/core/store/src/main/java/org/onlab/onos/store/impl/StoreManager.java
+++ b/core/store/src/main/java/org/onlab/onos/store/impl/StoreManager.java
@@ -21,7 +21,7 @@
 import org.onlab.onos.net.Port;
 import org.onlab.onos.net.PortNumber;
 import org.onlab.onos.net.provider.ProviderId;
-import org.onlab.onos.store.StoreService;
+import org.onlab.onos.store.common.StoreService;
 import org.onlab.onos.store.serializers.DefaultPortSerializer;
 import org.onlab.onos.store.serializers.DeviceIdSerializer;
 import org.onlab.onos.store.serializers.IpPrefixSerializer;