content: /*
   * 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.dht;
  
  import java.math.BigInteger;
  import java.util.Arrays;
  
  import org.junit.Test;
  
  import org.apache.cassandra.cql3.functions.types.utils.Bytes;
  import org.apache.cassandra.harry.checker.TestHelper;
  
  public class RandomPartitionerTest extends PartitionerTestCase
  {
      public void initPartitioner()
      {
          partitioner = RandomPartitioner.instance;
      }
  
      protected boolean shouldStopRecursion(Token left, Token right)
      {
          return left.size(right) < Math.scalb(1, -112);
      }
  
      @Test
      public void testSplit()
      {
          assertSplit(tok("a"), tok("b"), 16);
          assertSplit(tok("a"), tok("bbb"), 16);
      }
  
      @Test
      public void testSplitWrapping()
      {
          assertSplit(tok("b"), tok("a"), 16);
          assertSplit(tok("bbb"), tok("a"), 16);
      }
  
      @Test
      public void testSplitExceedMaximumCase()
      {
          RandomPartitioner.BigIntegerToken left = new RandomPartitioner.BigIntegerToken(RandomPartitioner.MAXIMUM.subtract(BigInteger.valueOf(10)));
  
          assertSplit(left, tok("a"), 16);
      }
  
      @Test
      public void testIncrement()
      {
          TestHelper.withRandom((rng) -> {
              for (int i = 0; i < 10_000; i++)
              {
                  BigInteger bi = BigInteger.valueOf(Math.abs(rng.next()));
                  byte[] bytes = bi.toByteArray();
                  byte[] copy = Arrays.copyOf(bytes, bytes.length);
  
                  BigInteger incremented = new BigInteger(RandomPartitioner.increment(bytes));
                  BigInteger expected = bi.add(BigInteger.valueOf(1));
                  if (!expected.equals(incremented))
                  {
                      throw new IllegalArgumentException(String.format("\nBefore increment: %s" +
                                                                       "\n After increment: %s," +
                                                                       "\n%s != %s",
                                                                       Bytes.toHexString(copy),
                                                                       Bytes.toHexString(bytes),
                                                                       expected,
                                                                       incremented));
                  }
              }
          });
      }
  
      @Test
      public void testDecrement()
      {
          TestHelper.withRandom((rng) -> {
              for (int i = 0; i < 10_000; i++)
              {
                  BigInteger bi = BigInteger.valueOf(Math.abs(rng.next() + 1));
                  byte[] bytes = bi.toByteArray();
                  byte[] copy = Arrays.copyOf(bytes, bytes.length);
  
                  RandomPartitioner.decrement(bytes);
                  BigInteger incremented = new BigInteger(bytes);
                  BigInteger expected = bi.add(BigInteger.valueOf(-1));
                  if (!expected.equals(incremented))
                  {
                      throw new IllegalArgumentException(String.format("\nBefore increment: %s" +
                                                                       "\n After increment: %s," +
                                                                       "\n%s != %s",
                                                                       Bytes.toHexString(copy),
                                                                       Bytes.toHexString(bytes),
                                                                       expected,
                                                                       incremented));
                  }
              }
          });
      }
  }
  