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.FileSystem;
  import alluxio.client.file.FileSystemContext;
  import alluxio.exception.status.InvalidArgumentException;
  import alluxio.exception.status.UnavailableException;
  import alluxio.master.MasterInquireClient;
  
  import org.apache.commons.cli.CommandLine;
  
  import java.net.InetSocketAddress;
  import java.util.List;
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * Prints information regarding master fault tolerance such as leader address, list of master
   * addresses, and the configured Zookeeper address.
   */
  @ThreadSafe
  @PublicApi
  public final class MasterInfoCommand extends AbstractFileSystemCommand {
    /**
     * @param fsContext the {@link FileSystem}
     */
    public MasterInfoCommand(FileSystemContext fsContext) {
      super(fsContext);
    }
  
    @Override
    public String getCommandName() {
      return "masterInfo";
    }
  
    @Override
    public void validateArgs(CommandLine cl) throws InvalidArgumentException {
      CommandUtils.checkNumOfArgsEquals(this, cl, 0);
    }
  
    @Override
    public int run(CommandLine cl) {
      MasterInquireClient inquireClient =
          MasterInquireClient.Factory
              .create(mFsContext.getClusterConf(), mFsContext.getClientContext().getUserState());
      try {
        InetSocketAddress leaderAddress = inquireClient.getPrimaryRpcAddress();
        System.out.println("Current leader master: " + leaderAddress.toString());
      } catch (UnavailableException e) {
        System.out.println("Failed to find leader master");
      }
  
      try {
        List<InetSocketAddress> masterAddresses = inquireClient.getMasterRpcAddresses();
        System.out.printf("All masters: %s%n", masterAddresses);
      } catch (UnavailableException e) {
        System.out.println("Failed to find all master addresses");
      }
      return 0;
    }
  
    @Override
    public String getUsage() {
      return "masterInfo";
    }
  
    @Override
    public String getDescription() {
      return "Prints information regarding master fault tolerance such as leader address, list of "
          + "master addresses, and the configured Zookeeper address.";
    }
  }
  