X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?p=controller.git;a=blobdiff_plain;f=opendaylight%2Fmd-sal%2Fsal-distributed-datastore%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fcontroller%2Fcluster%2Fdatastore%2FOperationCallback.java;h=592e6bc9c9f5ea0c1856dc2674aa5c0e81e79180;hp=b9445361bb9ff43521b124c5c20c6aa6b1c06358;hb=daaef05cbf70e6cbec9af181258faead6d9620a6;hpb=61722bffcf885c04d11f684f2f03b09fa96f2002

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/OperationCallback.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/OperationCallback.java
index b9445361bb..592e6bc9c9 100644
--- a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/OperationCallback.java
+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/OperationCallback.java
@@ -8,7 +8,31 @@
 
 package org.opendaylight.controller.cluster.datastore;
 
-public interface OperationCallback {
+import java.util.concurrent.atomic.AtomicReference;
+
+interface OperationCallback {
+    OperationCallback NO_OP_CALLBACK = new OperationCallback() {
+        @Override
+        public void run() {
+        }
+
+        @Override
+        public void success() {
+        }
+
+        @Override
+        public void failure() {
+        }
+    };
+
+    class Reference extends AtomicReference<OperationCallback> {
+        private static final long serialVersionUID = 1L;
+
+        public Reference(OperationCallback initialValue) {
+            super(initialValue);
+        }
+    }
+
     void run();
     void success();
     void failure();