[ONOS-7054] Implement prototype of ISSU protocol

Change-Id: Id543c0de9c97b68f977c824cbc987b35d81beb2d
diff --git a/core/api/src/test/java/org/onosproject/store/service/AtomicValueAdapter.java b/core/api/src/test/java/org/onosproject/store/service/AtomicValueAdapter.java
new file mode 100644
index 0000000..e6a4e2f
--- /dev/null
+++ b/core/api/src/test/java/org/onosproject/store/service/AtomicValueAdapter.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * 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.service;
+
+/**
+ * Atomic value adapter.
+ */
+public class AtomicValueAdapter<V> implements AtomicValue<V> {
+    private final String name;
+
+    public AtomicValueAdapter() {
+        this(null);
+    }
+
+    public AtomicValueAdapter(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public String name() {
+        return null;
+    }
+
+    @Override
+    public Type primitiveType() {
+        return null;
+    }
+
+    @Override
+    public boolean compareAndSet(V expect, V update) {
+        return false;
+    }
+
+    @Override
+    public V get() {
+        return null;
+    }
+
+    @Override
+    public V getAndSet(V value) {
+        return null;
+    }
+
+    @Override
+    public void set(V value) {
+
+    }
+
+    @Override
+    public void addListener(AtomicValueEventListener<V> listener) {
+
+    }
+
+    @Override
+    public void removeListener(AtomicValueEventListener<V> listener) {
+
+    }
+}