ONOS-2161 Add OVSDB adapter api in south bound.
Change-Id: I01e2976769b225444ab6fb94cb2fe9d26921ba1f
diff --git a/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/EventSubject.java b/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/EventSubject.java
new file mode 100644
index 0000000..6a06724
--- /dev/null
+++ b/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/EventSubject.java
@@ -0,0 +1,23 @@
+/*
+ * 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.ovsdb.controller;
+
+/**
+ * Represents for a entity that carry important information for listener.
+ */
+public interface EventSubject {
+
+}