Add distributed lock primitive

Change-Id: I60f4581d5acb5fc9b9a21d4191874bb56348af58
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixDistributedLockEvents.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixDistributedLockEvents.java
new file mode 100644
index 0000000..0ef9270
--- /dev/null
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixDistributedLockEvents.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2018-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.primitives.resources.impl;
+
+import io.atomix.protocols.raft.event.EventType;
+import org.onlab.util.KryoNamespace;
+import org.onosproject.store.serializers.KryoNamespaces;
+
+/**
+ * Raft value events.
+ */
+public enum AtomixDistributedLockEvents implements EventType {
+    LOCK("lock"),
+    FAIL("fail");
+
+    private final String id;
+
+    AtomixDistributedLockEvents(String id) {
+        this.id = id;
+    }
+
+    @Override
+    public String id() {
+        return id;
+    }
+
+    public static final KryoNamespace NAMESPACE = KryoNamespace.newBuilder()
+        .nextId(KryoNamespaces.BEGIN_USER_CUSTOM_ID + 50)
+        .register(LockEvent.class)
+        .register(byte[].class)
+        .build(AtomixDistributedLockEvents.class.getSimpleName());
+
+}