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.kafka.server.common;
  
  import org.apache.kafka.common.Uuid;
  
  public interface DirectoryEventHandler {
  
      /**
       * A no-op implementation of {@link DirectoryEventHandler}.
       */
      DirectoryEventHandler NOOP = new DirectoryEventHandler() {
          @Override public void handleAssignment(TopicIdPartition partition, Uuid directoryId, String reason, Runnable callback) {}
          @Override public void handleFailure(Uuid directoryId) {}
      };
  
      /**
       * Handle the assignment of a topic partition to a directory.
       * @param directoryId  The directory ID
       * @param partition    The topic partition
       * @param reason       The reason
       * @param callback     Callback to apply when the request is completed.
       */
      void handleAssignment(TopicIdPartition partition, Uuid directoryId, String reason, Runnable callback);
  
      /**
       * Handle the transition of an online log directory to the offline state.
       * @param directoryId  The directory ID
       */
      void handleFailure(Uuid directoryId);
  }
  