content: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package backtype.storm.utils;
  
  import java.util.HashMap;
  import java.util.UUID;
  
  // this class should be combined with RegisteredGlobalState
  public class ServiceRegistry {
      private static HashMap<String, Object> _services = new HashMap<>();
      private static final Object _lock = new Object();
  
      public static String registerService(Object service) {
          synchronized (_lock) {
              String id = UUID.randomUUID().toString();
              _services.put(id, service);
              return id;
          }
      }
  
      public static Object getService(String id) {
          synchronized (_lock) {
              return _services.get(id);
          }
      }
  
      public static void unregisterService(String id) {
          synchronized (_lock) {
              _services.remove(id);
          }
      }
  }
  