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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
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  package org.apache.cassandra.tools.nodetool;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Optional;
  
  import org.apache.cassandra.tools.NodeProbe;
  import org.apache.cassandra.tools.nodetool.layout.CassandraUsage;
  import picocli.CommandLine.Command;
  import picocli.CommandLine.Parameters;
  
  import static com.google.common.base.Preconditions.checkArgument;
  
  @Command(name = "setcachekeystosave", description = "Set number of keys saved by each cache for faster post-restart warmup. 0 to disable")
  public class SetCacheKeysToSave extends AbstractCommand
  {
      @CassandraUsage(usage = "<key-cache-keys-to-save> <row-cache-keys-to-save> <counter-cache-keys-to-save>",
                      description = "The number of keys saved by each cache. 0 to disable")
      private List<Integer> args = new ArrayList<>();
  
      @Parameters(paramLabel = "key-cache-keys-to-save", description = "Key cache keys to save", arity = "0..1", index = "0")
      private Integer keyCacheKeysToSave = null;
  
      @Parameters(paramLabel = "row-cache-keys-to-save", description = "Row cache keys to save", arity = "0..1", index = "1")
      private Integer rowCacheKeysToSave = null;
  
      @Parameters(paramLabel = "counter-cache-keys-to-save", description = "Counter cache keys to save", arity = "0..1", index = "2")
      private Integer counterCacheKeysToSave = null;
  
      @Override
      public void execute(NodeProbe probe)
      {
          Optional.ofNullable(keyCacheKeysToSave).ifPresent(args::add);
          Optional.ofNullable(rowCacheKeysToSave).ifPresent(args::add);
          Optional.ofNullable(counterCacheKeysToSave).ifPresent(args::add);
  
          checkArgument(args.size() == 3, "setcachekeystosave requires key-cache-keys-to-save, row-cache-keys-to-save, and counter-cache-keys-to-save args.");
          probe.setCacheKeysToSave(args.get(0), args.get(1), args.get(2));
      }
  }
  