1 files changed, 41 insertions, 0 deletions
diff --git a/framework/src/onos/core/api/src/main/java/org/onosproject/store/service/DistributedSet.java b/framework/src/onos/core/api/src/main/java/org/onosproject/store/service/DistributedSet.java
new file mode 100644
index 00000000..460206ec
--- /dev/null
+++ b/framework/src/onos/core/api/src/main/java/org/onosproject/store/service/DistributedSet.java
@@ -0,0 +1,41 @@
+/*
+ * 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.service;
+
+import java.util.Set;
+
+/**
+ * A distributed collection designed for holding unique elements.
+ *
+ * @param <E> set entry type
+ */
+public interface DistributedSet<E> extends Set<E> {
+
+    /**
+     * Registers the specified listener to be notified whenever
+     * the set is updated.
+     *
+     * @param listener listener to notify about set update events
+     */
+    void addListener(SetEventListener<E> listener);
+
+    /**
+     * Unregisters the specified listener.
+     *
+     * @param listener listener to unregister.
+     */
+    void removeListener(SetEventListener<E> listener);
+}