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    }