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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.transport;
  
  import java.nio.ByteBuffer;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Random;
  import java.util.function.Function;
  
  import com.datastax.driver.core.SimpleStatement;
  import org.apache.cassandra.cql3.ColumnIdentifier;
  import org.apache.cassandra.cql3.ColumnSpecification;
  import org.apache.cassandra.cql3.QueryOptions;
  import org.apache.cassandra.cql3.ResultSet;
  import org.apache.cassandra.db.ConsistencyLevel;
  import org.apache.cassandra.db.marshal.BytesType;
  import org.apache.cassandra.net.AbstractMessageHandler;
  import org.apache.cassandra.net.ResourceLimits;
  import org.apache.cassandra.transport.messages.QueryMessage;
  import org.apache.cassandra.transport.messages.ResultMessage;
  import org.apache.cassandra.utils.concurrent.NonBlockingRateLimiter;
  
  import static org.apache.cassandra.utils.concurrent.NonBlockingRateLimiter.NO_OP_LIMITER;
  
  public class BurnTestUtil
  {
      public static class SizeCaps
      {
          public final int valueMinSize;
          public final int valueMaxSize;
          public final int columnCountCap;
          public final int rowsCountCap;
  
          public SizeCaps(int valueMinSize, int valueMaxSize, int columnCountCap, int rowsCountCap)
          {
              this.valueMinSize = valueMinSize;
              this.valueMaxSize = valueMaxSize;
              this.columnCountCap = columnCountCap;
              this.rowsCountCap = rowsCountCap;
          }
      }
  
      public static SimpleStatement generateQueryStatement(int idx, SizeCaps sizeCaps)
      {
          Random rnd = new Random(idx);
  
          ByteBuffer[] values = new ByteBuffer[sizeCaps.columnCountCap];
          for (int i = 0; i < sizeCaps.columnCountCap; i++)
              values[i] = bytes(rnd, sizeCaps.valueMinSize, sizeCaps.valueMaxSize);
  
          return new SimpleStatement(Integer.toString(idx), (Object[]) values);
      }
  
      public static QueryMessage generateQueryMessage(int idx, SizeCaps sizeCaps, ProtocolVersion version)
      {
          Random rnd = new Random(idx);
          List<ByteBuffer> values = new ArrayList<>();
          for (int i = 0; i < sizeCaps.columnCountCap * sizeCaps.rowsCountCap; i++)
              values.add(bytes(rnd, sizeCaps.valueMinSize, sizeCaps.valueMaxSize));
  
          QueryOptions queryOptions = QueryOptions.create(ConsistencyLevel.ONE,
                                                          values,
                                                          true,
                                                          10,
                                                          null,
                                                          null,
                                                          version,
                                                          "KEYSPACE");
  
          return new QueryMessage(Integer.toString(idx), queryOptions);
      }
  
      public static ResultMessage.Rows generateRows(int idx, SizeCaps sizeCaps)
      {
          Random rnd = new Random(idx);
          List<ColumnSpecification> columns = new ArrayList<>();
          for (int i = 0; i < sizeCaps.columnCountCap; i++)
          {
              columns.add(new ColumnSpecification("ks", "cf",
                                                  new ColumnIdentifier(bytes(rnd, 5, 10), BytesType.instance),
                                                  BytesType.instance));
          }
  
          List<List<ByteBuffer>> rows = new ArrayList<>();
          int count = rnd.nextInt(sizeCaps.rowsCountCap);
          for (int i = 0; i < count; i++)
          {
              List<ByteBuffer> row = new ArrayList<>();
              for (int j = 0; j < sizeCaps.columnCountCap; j++)
                  row.add(bytes(rnd, sizeCaps.valueMinSize, sizeCaps.valueMaxSize));
              rows.add(row);
          }
  
          ResultSet resultSet = new ResultSet(new ResultSet.ResultMetadata(columns), rows);
          return new ResultMessage.Rows(resultSet);
      }
  
      public static ByteBuffer bytes(Random rnd, int minSize, int maxSize)
      {
          byte[] bytes = new byte[rnd.nextInt(maxSize) + minSize];
          rnd.nextBytes(bytes);
          return ByteBuffer.wrap(bytes);
      }
  
      public static Function<ClientResourceLimits.Allocator, ClientResourceLimits.ResourceProvider> observableResourceProvider(final CQLConnectionTest.AllocationObserver observer)
      {
          return allocator ->
          {
              final ClientResourceLimits.ResourceProvider.Default delegate = new ClientResourceLimits.ResourceProvider.Default(allocator);
              return new ClientResourceLimits.ResourceProvider()
              {
                  public ResourceLimits.Limit globalLimit()
                  {
                      return observer.global(delegate.globalLimit());
                  }
  
                  public AbstractMessageHandler.WaitQueue globalWaitQueue()
                  {
                      return delegate.globalWaitQueue();
                  }
  
                  public ResourceLimits.Limit endpointLimit()
                  {
                      return observer.endpoint(delegate.endpointLimit());
                  }
  
                  public AbstractMessageHandler.WaitQueue endpointWaitQueue()
                  {
                      return delegate.endpointWaitQueue();
                  }
  
                  @Override
                  public NonBlockingRateLimiter requestRateLimiter()
                  {
                      return NO_OP_LIMITER;
                  }
                  
                  public void release()
                  {
                      delegate.release();
                  }
              };
          };
      }
  }
  