adding Access device events and a listener
Change-Id: I0e9b4dae4231e7057443e7ed52723e29e06747cc
diff --git a/src/main/java/org/onosproject/olt/api/AccessDeviceListener.java b/src/main/java/org/onosproject/olt/api/AccessDeviceListener.java
new file mode 100644
index 0000000..f652a10
--- /dev/null
+++ b/src/main/java/org/onosproject/olt/api/AccessDeviceListener.java
@@ -0,0 +1,9 @@
+package org.onosproject.olt.api;
+
+import org.onosproject.event.EventListener;
+
+/**
+ * Entity capable of receiving access device related events.
+ */
+public interface AccessDeviceListener extends EventListener<AccessDeviceEvent> {
+}