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;
  
  import alluxio.cli.AbstractShell;
  import alluxio.cli.Command;
  import alluxio.client.file.FileSystemContext;
  import alluxio.conf.AlluxioConfiguration;
  import alluxio.conf.Configuration;
  import alluxio.conf.InstancedConfiguration;
  import alluxio.conf.PropertyKey;
  import alluxio.conf.Source;
  import alluxio.util.ConfigurationUtils;
  
  import com.google.common.collect.ImmutableMap;
  import com.google.common.collect.ImmutableSet;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.util.Map;
  import java.util.Set;
  import javax.annotation.concurrent.NotThreadSafe;
  
  /**
   * Class for handling command line inputs.
   */
  @NotThreadSafe
  public final class FileSystemShell extends AbstractShell {
    private static final Logger LOG = LoggerFactory.getLogger(FileSystemShell.class);
  
    private static final Map<String, String[]> CMD_ALIAS = ImmutableMap.<String, String[]>builder()
        .put("umount", new String[]{"unmount"})
        .build();
  
     // In order for a warning to be displayed for an unstable alias, it must also exist within the
     // CMD_ALIAS map.
    private static final Set<String> UNSTABLE_ALIAS = ImmutableSet.<String>builder()
        .build();
  
    /**
     * Main method, starts a new FileSystemShell.
     *
     * @param argv array of arguments given by the user's input from the terminal
     */
    public static void main(String[] argv) throws IOException {
      int ret;
      InstancedConfiguration conf = Configuration.modifiableGlobal();
      if (!ConfigurationUtils.masterHostConfigured(conf)
          && argv.length > 0 && !argv[0].equals("help")) {
        System.out.println(ConfigurationUtils.getMasterHostNotConfiguredMessage("Alluxio fs shell"));
        System.exit(1);
      }
  
      // Reduce the RPC retry max duration to fall earlier for CLIs
      conf.set(PropertyKey.USER_RPC_RETRY_MAX_DURATION, "5s", Source.DEFAULT);
      try (FileSystemShell shell = new FileSystemShell(conf)) {
        ret = shell.run(argv);
      }
      System.exit(ret);
    }
  
    /**
     * Creates a new instance of {@link FileSystemShell}.
     *
     * @param alluxioConf Alluxio configuration
     */
    public FileSystemShell(AlluxioConfiguration alluxioConf) {
      super(CMD_ALIAS, UNSTABLE_ALIAS, alluxioConf);
    }
  
    @Override
    protected String getShellName() {
      return "fs";
    }
  
    @Override
    protected Map<String, Command> loadCommands() {
      return FileSystemShellUtils
          .loadCommands(
            mCloser.register(FileSystemContext.create(mConfiguration)));
    }
  }
  