001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.conf;
019
020import org.apache.hadoop.conf.Configuration;
021import org.apache.yetus.audience.InterfaceAudience;
022import org.apache.yetus.audience.InterfaceStability;
023
024/**
025 * Every class that wants to observe changes in Configuration properties, must implement interface
026 * (and also, register itself with the {@link ConfigurationManager}.
027 */
028@InterfaceAudience.Private
029@InterfaceStability.Evolving
030public interface ConfigurationObserver {
031
032  /**
033   * This method would be called by the {@link ConfigurationManager} object when the
034   * {@link Configuration} object is reloaded from disk.
035   */
036  void onConfigurationChange(Configuration conf);
037}