[SEBA-36] Operational Status 802.1x Session

Cherry-picked from aaa-1.10

Change-Id: I6b90ec939c1f70b259fc96aedb34d2ab7e6b5812
diff --git a/api/src/main/java/org/opencord/aaa/AaaMachineStatisticsService.java b/api/src/main/java/org/opencord/aaa/AaaMachineStatisticsService.java
new file mode 100644
index 0000000..11095b3
--- /dev/null
+++ b/api/src/main/java/org/opencord/aaa/AaaMachineStatisticsService.java
@@ -0,0 +1,48 @@
+/*
+ * 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.opencord.aaa;
+
+import org.onosproject.event.ListenerService;
+
+/**
+ * Service for interacting with authentication module.
+ */
+public interface AaaMachineStatisticsService
+        extends ListenerService<AaaMachineStatisticsEvent, AaaMachineStatisticsEventListener> {
+    /**
+     * To get Supplicant machine stat.
+     *
+     * @param obj State Machine instance.
+     * @return supplicant stats.
+     */
+    public AaaSupplicantMachineStats getSupplicantStats(Object obj);
+
+    /**
+     * Returns AaaMachineStatisticsDelegate object.
+     *
+     * @return AaaMachineStatisticsDelegate.
+     */
+    public AaaMachineStatisticsDelegate getMachineStatsDelegate();
+
+    /**
+     * Log the Machine stats.
+     *
+     * @param obj of AaaSupplicantMachineStats.
+     */
+    void logAaaSupplicantMachineStats(AaaSupplicantMachineStats obj);
+
+}