+/*
+ * Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.cluster.datastore.actors.client;
+
+import javax.annotation.Nullable;
+
+/**
+ * This interface is used to pass the unit of work via the actors mailbox. The command can alter behavior of the actor
+ * by returning a new behavior.
+ *
+ * @author Robert Varga
+ */
+@FunctionalInterface
+public interface InternalCommand {
+ /**
+ * Run command actions.
+ *
+ * @return Next behavior to use in the client actor
+ */
+ @Nullable ClientActorBehavior execute();
+}