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   * 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.cassandra.tools.nodetool;
  
  import java.io.IOException;
  import java.io.PrintStream;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.cassandra.config.DurationSpec;
  import org.apache.cassandra.io.util.File;
  import org.apache.cassandra.service.snapshot.SnapshotOptions;
  import org.apache.cassandra.tools.NodeProbe;
  import picocli.CommandLine.Command;
  import picocli.CommandLine.Option;
  import picocli.CommandLine.Parameters;
  
  import static com.google.common.collect.Iterables.toArray;
  import static org.apache.cassandra.utils.Clock.Global.currentTimeMillis;
  import static org.apache.commons.lang3.StringUtils.join;
  
  @Command(name = "snapshot", description = "Take a snapshot of specified keyspaces or a snapshot of the specified table")
  public class Snapshot extends AbstractCommand
  {
      @Parameters(description = "List of keyspaces. By default, all keyspaces", arity = "0..*")
      private List<String> keyspaces = new ArrayList<>();
  
      @Option(paramLabel = "table", names = { "-cf", "--column-family", "--table" }, description = "The table name (you must specify one and only one keyspace for using this option)")
      private String table = null;
  
      @Option(paramLabel = "tag", names = { "-t", "--tag" }, description = "The name of the snapshot")
      private String snapshotName = Long.toString(currentTimeMillis());
  
      @Option(paramLabel = "ktlist", names = { "-kt", "--kt-list", "-kc", "--kc.list" }, description = "The list of Keyspace.table to take snapshot.(you must not specify only keyspace)")
      private String ktList = null;
  
      @Option(paramLabel = "skip-flush", names = { "-sf", "--skip-flush" }, description = "Do not flush memtables before snapshotting (snapshot will not contain unflushed data)")
      private boolean skipFlush = false;
  
      @Option(paramLabel = "ttl", names = { "--ttl" }, description = "Specify a TTL of created snapshot")
      private String ttl = null;
  
      @Override
      public void execute(NodeProbe probe)
      {
          PrintStream out = probe.output().out;
          try
          {
              StringBuilder sb = new StringBuilder();
  
              sb.append("Requested creating snapshot(s) for ");
  
              Map<String, String> options = new HashMap<String,String>();
              options.put(SnapshotOptions.SKIP_FLUSH, Boolean.toString(skipFlush));
              if (null != ttl) {
                  DurationSpec.LongNanosecondsBound d = new DurationSpec.LongNanosecondsBound(ttl);
                  options.put(SnapshotOptions.TTL, d.toString());
              }
  
              if (!snapshotName.isEmpty() && snapshotName.contains(File.pathSeparator()))
              {
                  throw new IOException("Snapshot name cannot contain " + File.pathSeparator());
              }
              // Create a separate path for kclist to avoid breaking of already existing scripts
              if (null != ktList && !ktList.isEmpty())
              {
                  ktList = ktList.replace(" ", "");
                  if (keyspaces.isEmpty() && null == table)
                      sb.append('[').append(ktList).append(']');
                  else
                  {
                      throw new IOException(
                              "When specifying the Keyspace table list (using -kt,--kt-list,-kc,--kc.list), you must not also specify keyspaces to snapshot");
                  }
                  if (!snapshotName.isEmpty())
                      sb.append(" with snapshot name [").append(snapshotName).append(']');
                  sb.append(" and options ").append(options);
                  out.println(sb);
                  probe.takeMultipleTableSnapshot(snapshotName, options, ktList.split(","));
                  out.println("Snapshot directory: " + snapshotName);
              }
              else
              {
                  if (keyspaces.isEmpty())
                      sb.append("[all keyspaces]");
                  else
                      sb.append('[').append(join(keyspaces, ", ")).append(']');
  
                  if (!snapshotName.isEmpty())
                      sb.append(" with snapshot name [").append(snapshotName).append(']');
                  sb.append(" and options ").append(options);
                  out.println(sb);
  
                  probe.takeSnapshot(snapshotName, table, options, toArray(keyspaces, String.class));
                  out.println("Snapshot directory: " + snapshotName);
              }
          }
          catch (IOException e)
          {
              throw new RuntimeException("Error during taking a snapshot", e);
          }
      }
  }
  