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.configmap;
  
  import java.util.Map;
  import java.util.Optional;
  import java.util.Set;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.skywalking.oap.server.configuration.api.ConfigTable;
  import org.apache.skywalking.oap.server.configuration.api.ConfigWatcherRegister;
  import org.apache.skywalking.oap.server.configuration.api.GroupConfigTable;
  
  @Slf4j
  public class ConfigmapConfigurationWatcherRegister extends ConfigWatcherRegister {
  
      private final ConfigurationConfigmapInformer informer;
  
      public ConfigmapConfigurationWatcherRegister(ConfigmapConfigurationSettings settings,
                                                   ConfigurationConfigmapInformer informer) {
          super(settings.getPeriod());
          this.informer = informer;
      }
  
      @Override
      public Optional<ConfigTable> readConfig(Set<String> keys) {
          final ConfigTable configTable = new ConfigTable();
          Map<String, String> configMapData = informer.configMapData();
          for (final String name : keys) {
              final String value = configMapData.get(name);
              if (log.isDebugEnabled()) {
                  log.debug("read config: name:{} ,value:{}", name, value);
              }
              configTable.add(new ConfigTable.ConfigItem(name, value));
          }
          return Optional.of(configTable);
      }
  
      @Override
      public Optional<GroupConfigTable> readGroupConfig(final Set<String> keys) {
          GroupConfigTable groupConfigTable = new GroupConfigTable();
          Map<String, String> configMapData = informer.configMapData();
          keys.forEach(key -> {
              GroupConfigTable.GroupConfigItems groupConfigItems = new GroupConfigTable.GroupConfigItems(key);
              groupConfigTable.addGroupConfigItems(groupConfigItems);
              configMapData.forEach((groupItemKey, itemValue) -> {
                  if (groupItemKey.startsWith(key + ".")) {
                      String itemName = groupItemKey.substring(key.length() + 1);
                      groupConfigItems.add(new ConfigTable.ConfigItem(itemName, itemValue));
                  }
              });
          });
  
          return Optional.of(groupConfigTable);
      }
  }
  