/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the "Elastic License
 * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
 * Public License v 1"; you may not use this file except in compliance with, at
 * your election, the "Elastic License 2.0", the "GNU Affero General Public
 * License v3.0 only", or the "Server Side Public License, v 1".
 */
package org.elasticsearch.cluster.routing;

import org.elasticsearch.action.ActionListener;
import org.elasticsearch.common.Priority;

/**
 * Asynchronously performs a cluster reroute, updating any shard states and rebalancing the cluster if appropriate.
 */
@FunctionalInterface
public interface RerouteService {

    /**
     * Schedule a cluster reroute.
     * @param priority the (minimum) priority at which to run this reroute. If there is already a pending reroute at a higher priority then
     *                 this reroute is batched with the pending one; if there is already a pending reroute at a lower priority then
     *                 the priority of the pending batch is raised to the given priority.
     */
    void reroute(String reason, Priority priority, ActionListener<Void> listener);
}