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.zookeeper.ut;
  
  import java.util.Optional;
  import java.util.Set;
  import org.apache.curator.framework.recipes.cache.ChildData;
  import org.apache.curator.framework.recipes.cache.PathChildrenCache;
  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;
  import org.apache.skywalking.oap.server.configuration.zookeeper.ZookeeperServerSettings;
  
  public class MockZookeeperConfigWatcherRegister extends ConfigWatcherRegister {
      private PathChildrenCache childrenCache;
      private final String prefix;
  
      public MockZookeeperConfigWatcherRegister(ZookeeperServerSettings settings) throws Exception {
          super(settings.getPeriod());
          prefix = settings.getNamespace() + "/";
      }
  
      @Override
      public Optional<ConfigTable> readConfig(Set<String> keys) {
          ConfigTable table = new ConfigTable();
          keys.forEach(s -> {
              ChildData data = this.childrenCache.getCurrentData(this.prefix + s);
              table.add(new ConfigTable.ConfigItem(s, data == null ? null : new String(data.getData())));
          });
          return Optional.of(table);
      }
  
      @Override
      public Optional<GroupConfigTable> readGroupConfig(final Set<String> keys) {
          return Optional.empty();
      }
  }