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 org.apache.bookkeeper.client;
  
  import io.netty.util.HashedWheelTimer;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  import java.util.Set;
  import org.apache.bookkeeper.conf.ClientConfiguration;
  import org.apache.bookkeeper.feature.FeatureProvider;
  import org.apache.bookkeeper.net.BookieId;
  import org.apache.bookkeeper.net.BookieNode;
  import org.apache.bookkeeper.net.DNSToSwitchMapping;
  import org.apache.bookkeeper.proto.BookieAddressResolver;
  import org.apache.bookkeeper.stats.StatsLogger;
  
  /**
   * A placement policy implementation use zone information for placing ensembles.
   *
   * @see EnsemblePlacementPolicy
   */
  public class ZoneawareEnsemblePlacementPolicy extends ZoneawareEnsemblePlacementPolicyImpl
          implements ITopologyAwareEnsemblePlacementPolicy<BookieNode> {
      ZoneawareEnsemblePlacementPolicyImpl slave = null;
  
      public ZoneawareEnsemblePlacementPolicy() {
          super();
      }
  
      @Override
      public EnsemblePlacementPolicy initialize(ClientConfiguration conf,
              Optional<DNSToSwitchMapping> optionalDnsResolver, HashedWheelTimer timer,
              FeatureProvider featureProvider,
              StatsLogger statsLogger, BookieAddressResolver bookieAddressResolver) {
          if (conf.getNetworkTopologyStabilizePeriodSeconds() > 0) {
              ClientConfiguration confClone = new ClientConfiguration(conf);
              confClone.setNetworkTopologyStabilizePeriodSeconds(0);
              super.initialize(confClone, optionalDnsResolver, timer, featureProvider,
                      statsLogger, bookieAddressResolver);
              slave = new ZoneawareEnsemblePlacementPolicyImpl();
              slave.initialize(conf, optionalDnsResolver, timer, featureProvider, statsLogger, bookieAddressResolver);
          } else {
              super.initialize(conf, optionalDnsResolver, timer, featureProvider, statsLogger, bookieAddressResolver);
              slave = null;
          }
          return this;
      }
  
      @Override
      public void uninitalize() {
          super.uninitalize();
          if (null != slave) {
              slave.uninitalize();
          }
      }
  
      @Override
      public Set<BookieId> onClusterChanged(Set<BookieId> writableBookies,
              Set<BookieId> readOnlyBookies) {
          Set<BookieId> deadBookies = super.onClusterChanged(writableBookies, readOnlyBookies);
          if (null != slave) {
              deadBookies = slave.onClusterChanged(writableBookies, readOnlyBookies);
          }
          return deadBookies;
      }
  
      @Override
      public PlacementResult<List<BookieId>> newEnsemble(int ensembleSize, int writeQuorumSize,
              int ackQuorumSize, Map<String, byte[]> customMetadata, Set<BookieId> excludeBookies)
              throws BKException.BKNotEnoughBookiesException {
          try {
              return super.newEnsemble(ensembleSize, writeQuorumSize, ackQuorumSize, customMetadata, excludeBookies);
          } catch (BKException.BKNotEnoughBookiesException bnebe) {
              if (slave == null) {
                  throw bnebe;
              } else {
                  return slave.newEnsemble(ensembleSize, writeQuorumSize, ackQuorumSize, customMetadata, excludeBookies);
              }
          }
      }
  
      @Override
      public PlacementResult<BookieId> replaceBookie(int ensembleSize, int writeQuorumSize, int ackQuorumSize,
              Map<String, byte[]> customMetadata, List<BookieId> currentEnsemble,
              BookieId bookieToReplace, Set<BookieId> excludeBookies)
              throws BKException.BKNotEnoughBookiesException {
         try {
              return super.replaceBookie(ensembleSize, writeQuorumSize, ackQuorumSize, customMetadata,
                      currentEnsemble, bookieToReplace, excludeBookies);
          } catch (BKException.BKNotEnoughBookiesException bnebe) {
              if (slave == null) {
                  throw bnebe;
              } else {
                  return slave.replaceBookie(ensembleSize, writeQuorumSize, ackQuorumSize, customMetadata,
                          currentEnsemble, bookieToReplace, excludeBookies);
              }
          }
      }
  
      @Override
      public void handleBookiesThatLeft(Set<BookieId> leftBookies) {
          super.handleBookiesThatLeft(leftBookies);
          if (null != slave) {
              slave.handleBookiesThatLeft(leftBookies);
          }
      }
  
      @Override
      public void handleBookiesThatJoined(Set<BookieId> joinedBookies) {
          super.handleBookiesThatJoined(joinedBookies);
          if (null != slave) {
              slave.handleBookiesThatJoined(joinedBookies);
          }
      }
  }
  