content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.
   */
  
  package org.apache.bookkeeper.client;
  
  import org.apache.bookkeeper.net.BookieNode;
  
  /**
   * Notifier used by the RackawareEnsemblePlacementPolicy to get notified if a
   * rack changes for a bookie.
   */
  public interface RackChangeNotifier {
  
      /**
       * Register a listener for the rack-aware placement policy.
       *
       * @param rackawarePolicy
       */
      void registerRackChangeListener(
              ITopologyAwareEnsemblePlacementPolicy<BookieNode> rackawarePolicy);
  }
  