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   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
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   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
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  package org.apache.cassandra.tools.nodetool;
  
  import java.util.ArrayList;
  import java.util.List;
  
  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;
  
  // TODO CASSANDRA-20791 Types of input aguments shouldn't depend on the number of arguments. Commands should be split into separate commands.
  @Command(name = "setconcurrency", description = "Set maximum concurrency for processing stage")
  public class SetConcurrency extends AbstractCommand
  {
      @CassandraUsage(usage = "<stage-name> <maximum-concurrency> | <stage-name> <core-pool> <maximum-concurrency>",
                      description = "Set concurrency for processing stage")
      @Parameters(paramLabel = "<stage-name> <maximum-concurrency> | <stage-name> <core-pool> <maximum-concurrency>",
                  arity = "2..3", description = "Set concurrency for processing stage")
      private List<String> args = new ArrayList<>();
  
      @Override
      public void execute(NodeProbe probe)
      {
          checkArgument(args.size() >= 2 && args.size() <= 3, "setconcurrency requires stage name, optional core pool size and maximum concurrency");
  
          int corePoolSize = args.size() == 2 ? -1 : Integer.valueOf(args.get(1));
          int maximumPoolSize = args.size() == 2 ? Integer.valueOf(args.get(1)) : Integer.valueOf(args.get(2));
  
          checkArgument(args.size() == 2 || corePoolSize >= 0, "Core pool size must be non-negative");
          checkArgument(maximumPoolSize >= 0, "Maximum pool size must be non-negative");
  
          try
          {
              probe.setConcurrency(args.get(0), corePoolSize, maximumPoolSize);
          }
          catch (IllegalArgumentException e)
          {
              String message = e.getMessage() != null ? e.getMessage() : "invalid pool size";
              probe.output().out.println("Unable to set concurrency: " + message);
              throw e;
          }
      }
  }
  