Initial implementation of EventuallyConsistentMap.

The map uses the gossip schemes to replicate data between instances. It seems
to work for basic add and remove use cases right now, no anti-entropy yet.

ONOS-844.

Change-Id: I7d05a7b532e40c95ab14e2c8911f18514bd0a8ca
diff --git a/core/store/dist/src/main/java/org/onosproject/store/impl/WallclockClockManager.java b/core/store/dist/src/main/java/org/onosproject/store/impl/WallclockClockManager.java
new file mode 100644
index 0000000..0103ee4
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onosproject/store/impl/WallclockClockManager.java
@@ -0,0 +1,28 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.store.impl;
+
+import org.onosproject.store.Timestamp;
+
+/**
+ * A clock service which hands out wallclock-based timestamps.
+ */
+public class WallclockClockManager<T> implements ClockService<T> {
+    @Override
+    public Timestamp getTimestamp(T object) {
+        return new WallClockTimestamp();
+    }
+}