/*
 * 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();
}