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.meta.zk;
  
  import static org.apache.bookkeeper.bookie.BookKeeperServerStats.BOOKIE_SCOPE;
  
  import com.google.common.annotations.VisibleForTesting;
  import java.util.Optional;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.bookkeeper.conf.ServerConfiguration;
  import org.apache.bookkeeper.discover.RegistrationManager;
  import org.apache.bookkeeper.discover.ZKRegistrationManager;
  import org.apache.bookkeeper.meta.MetadataBookieDriver;
  import org.apache.bookkeeper.meta.MetadataDrivers;
  import org.apache.bookkeeper.meta.exceptions.MetadataException;
  import org.apache.bookkeeper.stats.StatsLogger;
  import org.apache.bookkeeper.zookeeper.BoundExponentialBackoffRetryPolicy;
  import org.apache.zookeeper.ZooKeeper;
  
  /**
   * ZooKeeper based metadata bookie driver.
   */
  @Slf4j
  public class ZKMetadataBookieDriver
      extends ZKMetadataDriverBase
      implements MetadataBookieDriver {
  
      // register myself
      static {
          MetadataDrivers.registerBookieDriver(
              SCHEME,
              ZKMetadataBookieDriver.class);
      }
  
      ServerConfiguration serverConf;
  
      @Override
      public synchronized MetadataBookieDriver initialize(ServerConfiguration conf,
                                                          StatsLogger statsLogger)
              throws MetadataException {
          super.initialize(
              conf,
              statsLogger.scope(BOOKIE_SCOPE),
              new BoundExponentialBackoffRetryPolicy(conf.getZkRetryBackoffStartMs(),
                          conf.getZkRetryBackoffMaxMs(), conf.getZkRetryBackoffMaxRetries()),
              Optional.empty());
          this.serverConf = conf;
          this.statsLogger = statsLogger;
          return this;
      }
  
      @Override
      public synchronized RegistrationManager createRegistrationManager() {
          ZKRegistrationManager zkRegistrationManager = newZKRegistrationManager(serverConf, zk);
          return zkRegistrationManager;
      }
  
      @VisibleForTesting
      ZKRegistrationManager newZKRegistrationManager(ServerConfiguration serverConf, ZooKeeper zk) {
          return new ZKRegistrationManager(serverConf, zk);
      }
  
      @Override
      public void close() {
          super.close();
      }
  }
  