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.common;
  
  import org.apache.kafka.common.config.ConfigException;
  
  import java.util.Map;
  import java.util.Set;
  
  /**
   * Interface for reconfigurable classes that support dynamic configuration.
   */
  public interface Reconfigurable extends Configurable {
  
      /**
       * Returns the names of configs that may be reconfigured.
       */
      Set<String> reconfigurableConfigs();
  
      /**
       * Validates the provided configuration. The provided map contains
       * all configs including any reconfigurable configs that may be different
       * from the initial configuration. Reconfiguration will be not performed
       * if this method throws any exception.
       * @throws ConfigException if the provided configs are not valid. The exception
       *         message from ConfigException will be returned to the client in
       *         the AlterConfigs response.
       */
      void validateReconfiguration(Map<String, ?> configs) throws ConfigException;
  
      /**
       * Reconfigures this instance with the given key-value pairs. The provided
       * map contains all configs including any reconfigurable configs that
       * may have changed since the object was initially configured using
       * {@link Configurable#configure(Map)}. This method will only be invoked if
       * the configs have passed validation using {@link #validateReconfiguration(Map)}.
       */
      void reconfigure(Map<String, ?> configs);
  
  }
  