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 */
018
019package org.apache.hadoop.registry.server.services;
020
021import org.apache.hadoop.classification.InterfaceAudience;
022import org.apache.hadoop.classification.InterfaceStability;
023import org.apache.hadoop.service.CompositeService;
024import org.apache.hadoop.service.Service;
025
026/**
027 * Composite service that exports the add/remove methods.
028 * <p>
029 * This allows external classes to add services to these methods, after which
030 * they follow the same lifecyce.
031 * <p>
032 * It is essential that any service added is in a state where it can be moved
033 * on with that of the parent services. Specifically, do not add an uninited
034 * service to a parent that is already inited —as the <code>start</code>
035 * operation will then fail
036 *
037 */
038@InterfaceAudience.Public
039@InterfaceStability.Evolving
040public class AddingCompositeService extends CompositeService {
041
042
043  public AddingCompositeService(String name) {
044    super(name);
045  }
046
047  @Override
048  public void addService(Service service) {
049    super.addService(service);
050  }
051
052  @Override
053  public boolean removeService(Service service) {
054    return super.removeService(service);
055  }
056}