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.utils.obs;
  
  import java.io.ByteArrayInputStream;
  import java.io.DataInputStream;
  import java.io.IOException;
  import java.util.List;
  import java.util.Random;
  
  import com.google.common.collect.Lists;
  import org.apache.cassandra.io.util.DataOutputBuffer;
  import org.junit.Assert;
  import org.junit.Test;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assert.fail;
  
  public class OffHeapBitSetTest
  {
      private static final Random random = new Random();
  
      static void compare(IBitSet bs, IBitSet newbs)
      {
          assertEquals(bs.capacity(), newbs.capacity());
          for (long i = 0; i < bs.capacity(); i++)
              Assert.assertEquals(bs.get(i), newbs.get(i));
      }
  
      private void testOffHeapSerialization(boolean oldBfFormat) throws IOException
      {
          try (OffHeapBitSet bs = new OffHeapBitSet(100000))
          {
              for (long i = 0; i < bs.capacity(); i++)
                  if (random.nextBoolean())
                      bs.set(i);
  
              DataOutputBuffer out = new DataOutputBuffer();
              if (oldBfFormat)
                  bs.serializeOldBfFormat(out);
              else
                  bs.serialize(out);
  
              DataInputStream in = new DataInputStream(new ByteArrayInputStream(out.getData()));
              try (OffHeapBitSet newbs = OffHeapBitSet.deserialize(in, oldBfFormat))
              {
                  compare(bs, newbs);
              }
          }
      }
  
      @Test
      public void testSerialization() throws IOException
      {
          testOffHeapSerialization(true);
          testOffHeapSerialization(false);
      }
  
      @Test
      public void testBitSetGetClear()
      {
          int size = Integer.MAX_VALUE / 4000;
          try (OffHeapBitSet bs = new OffHeapBitSet(size))
          {
              List<Integer> randomBits = Lists.newArrayList();
              for (int i = 0; i < 10; i++)
                  randomBits.add(random.nextInt(size));
  
              for (long randomBit : randomBits)
                  bs.set(randomBit);
  
              for (long randomBit : randomBits)
                  assertEquals(true, bs.get(randomBit));
  
              for (long randomBit : randomBits)
                  bs.clear(randomBit);
  
              for (long randomBit : randomBits)
                  assertEquals(false, bs.get(randomBit));
          }
      }
  
      @Test(expected = UnsupportedOperationException.class)
      public void testUnsupportedLargeSize()
      {
          long size = 64L * Integer.MAX_VALUE + 1; // Max size 16G * 8 bits
          OffHeapBitSet bs = new OffHeapBitSet(size);
      }
  
      @Test
      public void testInvalidIndex()
      {
          OffHeapBitSet bs = new OffHeapBitSet(10);
          int invalidIdx[] = {-1, 64, 1000};
  
          for (int i : invalidIdx)
          {
              try
              {
                  bs.set(i);
              }
              catch (AssertionError e)
              {
                  assertTrue(e.getMessage().startsWith("Illegal bounds"));
                  continue;
              }
              fail(String.format("expect exception for index %d", i));
          }
  
          for (int i : invalidIdx)
          {
              try
              {
                  bs.get(i);
              }
              catch (AssertionError e)
              {
                  assertTrue(e.getMessage().startsWith("Illegal bounds"));
                  continue;
              }
              fail(String.format("expect exception for index %d", i));
          }
      }
  }
  