| /* |
| * 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)); |
| } |
| } |
| } |