Implement listeners for ConsistentMultimap.
Change-Id: Ica07d444c18af8ba7a9bbb120623512def572a48
diff --git a/core/api/src/main/java/org/onosproject/store/service/MultimapEventListener.java b/core/api/src/main/java/org/onosproject/store/service/MultimapEventListener.java
new file mode 100644
index 0000000..2445af9
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/store/service/MultimapEventListener.java
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2017-present 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.service;
+
+/**
+ * Listener to be notified about updates to a ConsistentMultimap.
+ */
+public interface MultimapEventListener<K, V> {
+
+ /**
+ * Reacts to the specified event.
+ *
+ * @param event the event
+ */
+ void event(MultimapEvent<K, V> event);
+}