content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.cli.fs.command;
  
  import alluxio.annotation.PublicApi;
  import alluxio.cli.CommandUtils;
  import alluxio.client.file.FileSystemContext;
  import alluxio.client.file.FileSystemMasterClient;
  import alluxio.exception.status.InvalidArgumentException;
  import alluxio.exception.status.UnavailableException;
  import alluxio.grpc.ServiceType;
  import alluxio.master.MasterInquireClient;
  import alluxio.master.PollingMasterInquireClient;
  import alluxio.resource.CloseableResource;
  import alluxio.retry.ExponentialBackoffRetry;
  
  import org.apache.commons.cli.CommandLine;
  
  import java.net.InetSocketAddress;
  import java.util.Arrays;
  import java.util.List;
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * Prints the current leader master host name.
   *
   * @deprecated This command will be deprecated as of v3.0, use {@link MasterInfoCommand}
   */
  @ThreadSafe
  @PublicApi
  @Deprecated
  public final class LeaderCommand extends AbstractFileSystemCommand {
  
    /**
     * @param fsContext the filesystem of Alluxio
     */
    public LeaderCommand(FileSystemContext fsContext) {
      super(fsContext);
    }
  
    @Override
    public String getCommandName() {
      return "leader";
    }
  
    @Override
    public void validateArgs(CommandLine cl) throws InvalidArgumentException {
      CommandUtils.checkNumOfArgsEquals(this, cl, 0);
    }
  
    @Override
    public int run(CommandLine cl) {
      System.out.println("This command will be deprecated as of v3.0, please use masterInfo command");
      try (CloseableResource<FileSystemMasterClient> client =
          mFsContext.acquireMasterClientResource()) {
        try {
          InetSocketAddress address = (InetSocketAddress) client.get().getRemoteSockAddress();
          System.out.println(address.getHostName());
  
          List<InetSocketAddress> addresses = Arrays.asList(address);
          MasterInquireClient inquireClient = new PollingMasterInquireClient(addresses, () ->
                  new ExponentialBackoffRetry(50, 100, 2), mFsContext.getClusterConf(),
              ServiceType.META_MASTER_CLIENT_SERVICE
          );
          try {
            inquireClient.getPrimaryRpcAddress();
          } catch (UnavailableException e) {
            System.err.println("The leader is not currently serving requests.");
          }
        } catch (UnavailableException e) {
          System.err.println("Failed to get the leader master.");
        }
      }
      return 0;
    }
  
    @Override
    public String getUsage() {
      return "leader";
    }
  
    @Override
    public String getDescription() {
      return "Prints the current leader master host name.";
    }
  }
  