/* * 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.util.List; import java.util.Random; import com.google.common.collect.Lists; import org.junit.Assert; import org.junit.Test; import org.apache.cassandra.io.util.DataOutputBuffer; import org.apache.cassandra.utils.IFilter.FilterKey; 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() { compareBitSets(false); compareBitSets(true); } private static void compareBitSets(boolean oldBfHashOrder) { BloomFilter bf2 = (BloomFilter) FilterFactory.getFilter(FilterTestHelper.ELEMENTS / 2, FilterTestHelper.MAX_FAILURE_RATE, false, oldBfHashOrder); BloomFilter bf3 = (BloomFilter) FilterFactory.getFilter(FilterTestHelper.ELEMENTS / 2, FilterTestHelper.MAX_FAILURE_RATE, true, oldBfHashOrder); RandomStringGenerator gen1 = new KeyGenerator.RandomStringGenerator(new Random().nextInt(), FilterTestHelper.ELEMENTS); // make sure both bitsets are empty. compare(bf2.bitset, bf3.bitset); while (gen1.hasNext()) { FilterKey key = FilterTestHelper.wrap(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 { try (OffHeapBitSet bs = new OffHeapBitSet(100000)) { populateAndReserialize(bs); } } @Test public void testOffHeapCompatibility() throws IOException { try (OpenBitSet bs = new OpenBitSet(100000)) { populateAndReserialize(bs); } } private static 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())); try (OffHeapBitSet newbs = OffHeapBitSet.deserialize(in)) { compare(bs, newbs); } } 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)); } @Test public void testBitClear() { int size = Integer.MAX_VALUE / 4000; try (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)); } } }