code: /*
   * 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 org.apache.skywalking.oap.server.configuration.api;
  
  import java.util.Map;
  import org.apache.skywalking.oap.server.library.module.ModuleProvider;
  
  public abstract class GroupConfigChangeWatcher extends ConfigChangeWatcher {
      public GroupConfigChangeWatcher(final String module,
                                      final ModuleProvider provider,
                                      final String itemName) {
          super(module, provider, itemName);
          super.watchType = WatchType.GROUP;
      }
  
      @Override
      public String value() {
          throw new UnsupportedOperationException("Unsupported method value() in GroupConfigChangeWatcher");
      }
  
      @Override
      public void notify(ConfigChangeEvent value) {
          throw new UnsupportedOperationException("Unsupported method notify() in GroupConfigChangeWatcher");
      }
  
      /**
       * @return current groupConfigs.
       */
      public abstract Map<String, String> groupItems();
  
      public abstract void notifyGroup(Map<String , ConfigChangeEvent> groupItems);
  }
  