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.yetus.audience.InterfaceAudience; 021 022/** 023 * This extension to ConfigurationObserver allows the configuration to propagate to the children of 024 * the current {@link ConfigurationObserver}. This is the preferred way to make a class online 025 * configurable because it allows the user to configure the children in a recursive manner 026 * automatically. 027 */ 028@InterfaceAudience.Private 029public interface PropagatingConfigurationObserver extends ConfigurationObserver { 030 031 /** 032 * Needs to be called to register the children to the manager. 033 * @param manager : to register to 034 */ 035 void registerChildren(ConfigurationManager manager); 036 037 /** 038 * Needs to be called to deregister the children from the manager. 039 * @param manager : to deregister from 040 */ 041 void deregisterChildren(ConfigurationManager manager); 042}