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 com.google.common.base.Strings;
  import org.apache.skywalking.oap.server.configuration.api.AbstractConfigurationProvider;
  import org.apache.skywalking.oap.server.configuration.api.ConfigWatcherRegister;
  import org.apache.skywalking.oap.server.library.module.ModuleStartException;
  
  public class ConfigmapConfigurationProvider extends AbstractConfigurationProvider {
  
      private ConfigmapConfigurationSettings settings;
  
      @Override
      public String name() {
          return "k8s-configmap";
      }
  
      @Override
      public ConfigCreator newConfigCreator() {
          return new ConfigCreator<ConfigmapConfigurationSettings>() {
              @Override
              public Class type() {
                  return ConfigmapConfigurationSettings.class;
              }
  
              @Override
              public void onInitialized(final ConfigmapConfigurationSettings initialized) {
                  settings = initialized;
              }
          };
      }
  
      @Override
      protected ConfigWatcherRegister initConfigReader() throws ModuleStartException {
          if (Strings.isNullOrEmpty(settings.getLabelSelector()) || Strings.isNullOrEmpty(settings.getNamespace())) {
              throw new ModuleStartException("the settings of configmap configuration is illegal.");
          }
          ConfigurationConfigmapInformer informer = new ConfigurationConfigmapInformer(settings);
          return new ConfigmapConfigurationWatcherRegister(settings, informer);
      }
  
  }
  