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.tests.integration.cluster;
  
  import com.google.common.base.Stopwatch;
  import java.net.URI;
  import java.util.Optional;
  import java.util.Random;
  import java.util.Set;
  import java.util.concurrent.Executors;
  import java.util.concurrent.ScheduledExecutorService;
  import java.util.concurrent.TimeUnit;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.bookkeeper.client.DefaultBookieAddressResolver;
  import org.apache.bookkeeper.common.concurrent.FutureUtils;
  import org.apache.bookkeeper.conf.ClientConfiguration;
  import org.apache.bookkeeper.meta.MetadataClientDriver;
  import org.apache.bookkeeper.meta.MetadataDrivers;
  import org.apache.bookkeeper.net.BookieId;
  import org.apache.bookkeeper.stats.NullStatsLogger;
  import org.apache.bookkeeper.tests.integration.topologies.BKCluster;
  import org.apache.bookkeeper.tests.integration.topologies.BKClusterSpec;
  import org.junit.AfterClass;
  import org.junit.BeforeClass;
  
  /**
   * A docker container based bookkeeper cluster test base, providing similar facility like the one in unit test.
   */
  @Slf4j
  public abstract class BookKeeperClusterTestBase {
  
      protected static BKCluster bkCluster;
      protected static URI metadataServiceUri;
      protected static MetadataClientDriver metadataClientDriver;
      protected static ScheduledExecutorService executor;
      protected static Random rand = new Random();
  
      @BeforeClass
      public static void setupCluster() throws Exception {
          StringBuilder sb = new StringBuilder();
          for (int i = 0; i < 8; i++) {
              sb.append((char) (rand.nextInt(26) + 'a'));
          }
          BKClusterSpec spec = BKClusterSpec.builder()
              .clusterName(sb.toString())
              .numBookies(0)
              .build();
  
          setupCluster(spec);
      }
  
      protected static void setupCluster(BKClusterSpec spec) throws Exception {
          log.info("Setting up cluster {} with {} bookies : extraServerComponents = {}",
              spec.clusterName(), spec.numBookies(), spec.extraServerComponents());
  
          bkCluster = BKCluster.forSpec(spec);
          bkCluster.start();
  
          log.info("Cluster {} is setup", spec.clusterName());
  
          metadataServiceUri = URI.create(bkCluster.getExternalServiceUri());
          ClientConfiguration conf = new ClientConfiguration()
              .setMetadataServiceUri(metadataServiceUri.toString());
          executor = Executors.newSingleThreadScheduledExecutor();
          metadataClientDriver = MetadataDrivers.getClientDriver(metadataServiceUri);
          metadataClientDriver.initialize(conf, executor, NullStatsLogger.INSTANCE, Optional.empty());
  
          log.info("Initialized metadata client driver : {}", metadataServiceUri);
      }
  
      @AfterClass
      public static void teardownCluster() {
          if (null != metadataClientDriver) {
              metadataClientDriver.close();
          }
          if (null != executor) {
              executor.shutdown();
          }
          if (null != bkCluster) {
              bkCluster.stop();
          }
      }
  
      private static boolean findIfBookieRegistered(String bookieName) throws Exception {
          DefaultBookieAddressResolver resolver =
                  new DefaultBookieAddressResolver(metadataClientDriver.getRegistrationClient());
          Set<BookieId> bookies =
              FutureUtils.result(metadataClientDriver
                      .getRegistrationClient().getWritableBookies()).getValue();
          Optional<BookieId> registered =
              bookies.stream().filter(addr -> resolver.resolve(addr).getHostName().equals(bookieName)).findFirst();
          return registered.isPresent();
      }
  
      protected static void waitUntilBookieUnregistered(String bookieName) throws Exception {
          Stopwatch sw = Stopwatch.createStarted();
          while (findIfBookieRegistered(bookieName)) {
              TimeUnit.MILLISECONDS.sleep(1000);
              log.info("Bookie {} is still registered in cluster {} after {} ms elapsed",
                  bookieName, bkCluster.getClusterName(), sw.elapsed(TimeUnit.MILLISECONDS));
          }
      }
  
  }
  