1 files changed, 39 insertions, 0 deletions
diff --git a/jar/src/main/java/org/onap/music/lockingservice/LockListener.java b/jar/src/main/java/org/onap/music/lockingservice/LockListener.java
new file mode 100644
index 00000000..33188e60
--- /dev/null
+++ b/jar/src/main/java/org/onap/music/lockingservice/LockListener.java
@@ -0,0 +1,39 @@
+/*
+ * ============LICENSE_START==========================================
+ * org.onap.music
+ * ===================================================================
+ *  Copyright (c) 2017 AT&T Intellectual Property
+ * ===================================================================
+ *  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.
+ * 
+ * ============LICENSE_END=============================================
+ * ====================================================================
+ */
+package org.onap.music.lockingservice;
+
+/**
+ * This class has two methods which are call back methods when a lock is acquired and when the lock
+ * is released.
+ *
+ */
+public interface LockListener {
+    /**
+     * call back called when the lock is acquired
+     */
+    public void lockAcquired();
+
+    /**
+     * call back called when the lock is released.
+     */
+    public void lockReleased();
+}