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
019 package org.apache.hadoop.registry.server.services;
020
021 import org.apache.hadoop.classification.InterfaceAudience;
022 import org.apache.hadoop.classification.InterfaceStability;
023 import org.apache.hadoop.service.CompositeService;
024 import 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
040 public 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 }