/*
* 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;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.List;
import java.util.Random;
import com.google.common.collect.Lists;
import org.junit.Test;
import org.junit.Assert;
import org.apache.cassandra.io.util.DataOutputBuffer;
import org.apache.cassandra.utils.KeyGenerator.RandomStringGenerator;
import org.apache.cassandra.utils.obs.IBitSet;
import org.apache.cassandra.utils.obs.OffHeapBitSet;
import org.apache.cassandra.utils.obs.OpenBitSet;
import static org.junit.Assert.assertEquals;
public class BitSetTest
{
/**
* Test bitsets in a "real-world" environment, i.e., bloom filters
*/
@Test
public void compareBitSets()
{
BloomFilter bf2 = (BloomFilter) FilterFactory.getFilter(FilterTestHelper.ELEMENTS / 2, FilterTestHelper.MAX_FAILURE_RATE, false);
BloomFilter bf3 = (BloomFilter) FilterFactory.getFilter(FilterTestHelper.ELEMENTS / 2, FilterTestHelper.MAX_FAILURE_RATE, true);
RandomStringGenerator gen1 = new KeyGenerator.RandomStringGenerator(new Random().nextInt(), FilterTestHelper.ELEMENTS);
// make sure both bitsets are empty.
compare(bf2.bitset, bf3.bitset);
while (gen1.hasNext())
{
ByteBuffer key = gen1.next();
bf2.add(key);
bf3.add(key);
}
compare(bf2.bitset, bf3.bitset);
}
private static final Random random = new Random();
/**
* Test serialization and de-serialization in-memory
*/
@Test
public void testOffHeapSerialization() throws IOException
{
OffHeapBitSet bs = new OffHeapBitSet(100000);
populateAndReserialize(bs);
}
@Test
public void testOffHeapCompatibility() throws IOException
{
OpenBitSet bs = new OpenBitSet(100000);
populateAndReserialize(bs);
}
private void populateAndReserialize(IBitSet bs) throws IOException
{
for (long i = 0; i < bs.capacity(); i++)
if (random.nextBoolean())
bs.set(i);
DataOutputBuffer out = new DataOutputBuffer();
bs.serialize(out);
DataInputStream in = new DataInputStream(new ByteArrayInputStream(out.getData()));
OffHeapBitSet newbs = OffHeapBitSet.deserialize(in);
compare(bs, newbs);
}
private 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));
}
@Test
public void testBitClear() throws IOException
{
int size = Integer.MAX_VALUE / 4000;
OffHeapBitSet bitset = new OffHeapBitSet(size);
List<Integer> randomBits = Lists.newArrayList();
for (int i = 0; i < 10; i++)
randomBits.add(random.nextInt(size));
for (long randomBit : randomBits)
bitset.set(randomBit);
for (long randomBit : randomBits)
Assert.assertEquals(true, bitset.get(randomBit));
for (long randomBit : randomBits)
bitset.clear(randomBit);
for (long randomBit : randomBits)
Assert.assertEquals(false, bitset.get(randomBit));
bitset.close();
}
}