content: package org.apache.cassandra.stress.operations.userdefined;
  /*
   * 
   * 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.
   * 
   */
  
  
  import java.io.IOException;
  import java.util.Random;
  import java.util.stream.Collectors;
  
  import com.datastax.driver.core.BoundStatement;
  import com.datastax.driver.core.PreparedStatement;
  import com.datastax.driver.core.ResultSet;
  import org.apache.cassandra.db.ConsistencyLevel;
  import org.apache.cassandra.stress.generate.*;
  import org.apache.cassandra.stress.report.Timer;
  import org.apache.cassandra.stress.settings.StressSettings;
  import org.apache.cassandra.stress.util.JavaDriverClient;
  
  public class SchemaQuery extends SchemaStatement
  {
      final ArgSelect argSelect;
      final Object[][] randomBuffer;
      final Random random = new Random();
  
      public SchemaQuery(Timer timer, StressSettings settings, PartitionGenerator generator, SeedManager seedManager, PreparedStatement statement, ConsistencyLevel cl, ArgSelect argSelect)
      {
          super(timer, settings, new DataSpec(generator, seedManager, new DistributionFixed(1), settings.insert.rowPopulationRatio.get(), argSelect == SchemaStatement.ArgSelect.MULTIROW ? statement.getVariables().size() : 1), statement,
                statement.getVariables().asList().stream().map(d -> d.getName()).collect(Collectors.toList()), cl);
          this.argSelect = argSelect;
          randomBuffer = new Object[argumentIndex.length][argumentIndex.length];
      }
  
      private class JavaDriverRun extends Runner
      {
          final JavaDriverClient client;
  
          private JavaDriverRun(JavaDriverClient client)
          {
              this.client = client;
          }
  
          public boolean run() throws Exception
          {
              ResultSet rs = client.getSession().execute(bindArgs());
              rowCount = rs.all().size();
              partitionCount = Math.min(1, rowCount);
              return true;
          }
      }
  
      private int fillRandom()
      {
          int c = 0;
          PartitionIterator iterator = partitions.get(0);
          while (iterator.hasNext())
          {
              Row row = iterator.next();
              Object[] randomBufferRow = randomBuffer[c++];
              for (int i = 0 ; i < argumentIndex.length ; i++)
                  randomBufferRow[i] = row.get(argumentIndex[i]);
              if (c >= randomBuffer.length)
                  break;
          }
          assert c > 0;
          return c;
      }
  
      BoundStatement bindArgs()
      {
          switch (argSelect)
          {
              case MULTIROW:
                  int c = fillRandom();
                  for (int i = 0 ; i < argumentIndex.length ; i++)
                  {
                      int argIndex = argumentIndex[i];
                      bindBuffer[i] = randomBuffer[argIndex < 0 ? 0 : random.nextInt(c)][i];
                  }
                  return statement.bind(bindBuffer);
              case SAMEROW:
                  return bindRow(partitions.get(0).next());
              default:
                  throw new IllegalStateException();
          }
      }
  
      @Override
      public void run(JavaDriverClient client) throws IOException
      {
          timeWithRetry(new JavaDriverRun(client));
      }
  }
  