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* Licensed to the Apache Software Foundation (ASF) under one
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* 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,
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* See the License for the specific language governing permissions and
* limitations under the License.
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package org.apache.cassandra.index.sasi.utils;
import java.util.*;
import java.util.concurrent.ThreadLocalRandom;
import org.apache.cassandra.index.sasi.disk.Token;
import org.apache.cassandra.io.util.FileUtils;
import org.junit.Assert;
import org.junit.Test;
import static org.apache.cassandra.index.sasi.utils.LongIterator.convert;
public class RangeUnionIteratorTest
{
@Test
public void testNoOverlappingValues()
{
RangeUnionIterator.Builder<Long, Token> builder = RangeUnionIterator.builder();
builder.add(new LongIterator(new long[] { 2L, 3L, 5L, 6L }));
builder.add(new LongIterator(new long[] { 1L, 7L }));
builder.add(new LongIterator(new long[] { 4L, 8L, 9L, 10L }));
Assert.assertEquals(convert(1L, 2L, 3L, 4L, 5L, 6L, 7L, 8L, 9L, 10L), convert(builder.build()));
}
@Test
public void testSingleIterator()
{
RangeUnionIterator.Builder<Long, Token> builder = RangeUnionIterator.builder();
builder.add(new LongIterator(new long[] { 1L, 2L, 4L, 9L }));
Assert.assertEquals(convert(1L, 2L, 4L, 9L), convert(builder.build()));
}
@Test
public void testOverlappingValues()
{
RangeUnionIterator.Builder<Long, Token> builder = RangeUnionIterator.builder();
builder.add(new LongIterator(new long[] { 1L, 4L, 6L, 7L }));
builder.add(new LongIterator(new long[] { 2L, 3L, 5L, 6L }));
builder.add(new LongIterator(new long[] { 4L, 6L, 8L, 9L, 10L }));
List<Long> values = convert(builder.build());
Assert.assertEquals(values.toString(), convert(1L, 2L, 3L, 4L, 5L, 6L, 7L, 8L, 9L, 10L), values);
}
@Test
public void testNoOverlappingRanges()
{
RangeUnionIterator.Builder<Long, Token> builder = RangeUnionIterator.builder();
builder.add(new LongIterator(new long[] { 1L, 2L, 3L }));
builder.add(new LongIterator(new long[] { 4L, 5L, 6L }));
builder.add(new LongIterator(new long[] { 7L, 8L, 9L }));
Assert.assertEquals(convert(1L, 2L, 3L, 4L, 5L, 6L, 7L, 8L, 9L), convert(builder.build()));
}
@Test
public void testTwoIteratorsWithSingleValues()
{
RangeUnionIterator.Builder<Long, Token> builder = RangeUnionIterator.builder();
builder.add(new LongIterator(new long[] { 1L }));
builder.add(new LongIterator(new long[] { 1L }));
Assert.assertEquals(convert(1L), convert(builder.build()));
}
@Test
public void testDifferentSizeIterators()
{
RangeUnionIterator.Builder<Long, Token> builder = RangeUnionIterator.builder();
builder.add(new LongIterator(new long[] { 2L, 3L, 5L, 6L, 12L, 13L }));
builder.add(new LongIterator(new long[] { 1L, 7L, 14L, 15 }));
builder.add(new LongIterator(new long[] { 4L, 5L, 8L, 9L, 10L }));
Assert.assertEquals(convert(1L, 2L, 3L, 4L, 5L, 6L, 7L, 8L, 9L, 10L, 12L, 13L, 14L, 15L), convert(builder.build()));
}
@Test
public void testRandomSequences()
{
ThreadLocalRandom random = ThreadLocalRandom.current();
long[][] values = new long[random.nextInt(1, 20)][];
int numTests = random.nextInt(10, 20);
for (int tests = 0; tests < numTests; tests++)
{
RangeUnionIterator.Builder<Long, Token> builder = RangeUnionIterator.builder();
int totalCount = 0;
for (int i = 0; i < values.length; i++)
{
long[] part = new long[random.nextInt(1, 500)];
for (int j = 0; j < part.length; j++)
part[j] = random.nextLong();
// all of the parts have to be sorted to mimic SSTable
Arrays.sort(part);
values[i] = part;
builder.add(new LongIterator(part));
totalCount += part.length;
}
long[] totalOrdering = new long[totalCount];
int index = 0;
for (long[] part : values)
{
for (long value : part)
totalOrdering[index++] = value;
}
Arrays.sort(totalOrdering);
int count = 0;
RangeIterator<Long, Token> tokens = builder.build();
Assert.assertNotNull(tokens);
while (tokens.hasNext())
Assert.assertEquals(totalOrdering[count++], (long) tokens.next().get());
Assert.assertEquals(totalCount, count);
}
}
@Test
public void testMinMaxAndCount()
{
RangeUnionIterator.Builder<Long, Token> builder = RangeUnionIterator.builder();
builder.add(new LongIterator(new long[] { 1L, 2L, 3L }));
builder.add(new LongIterator(new long[] { 4L, 5L, 6L }));
builder.add(new LongIterator(new long[] { 7L, 8L, 9L }));
Assert.assertEquals(9L, (long) builder.getMaximum());
Assert.assertEquals(9L, builder.getTokenCount());
RangeIterator<Long, Token> tokens = builder.build();
Assert.assertNotNull(tokens);
Assert.assertEquals(1L, (long) tokens.getMinimum());
Assert.assertEquals(9L, (long) tokens.getMaximum());
Assert.assertEquals(9L, tokens.getCount());
for (long i = 1; i < 10; i++)
{
Assert.assertTrue(tokens.hasNext());
Assert.assertEquals(i, (long) tokens.next().get());
}
Assert.assertFalse(tokens.hasNext());
Assert.assertEquals(1L, (long) tokens.getMinimum());
}
@Test
public void testBuilder()
{
RangeUnionIterator.Builder<Long, Token> builder = RangeUnionIterator.builder();
Assert.assertNull(builder.getMinimum());
Assert.assertNull(builder.getMaximum());
Assert.assertEquals(0L, builder.getTokenCount());
Assert.assertEquals(0L, builder.rangeCount());
builder.add(new LongIterator(new long[] { 1L, 2L, 3L }));
builder.add(new LongIterator(new long[] { 4L, 5L, 6L }));
builder.add(new LongIterator(new long[] { 7L, 8L, 9L }));
Assert.assertEquals(1L, (long) builder.getMinimum());
Assert.assertEquals(9L, (long) builder.getMaximum());
Assert.assertEquals(9L, builder.getTokenCount());
Assert.assertEquals(3L, builder.rangeCount());
Assert.assertFalse(builder.statistics.isDisjoint());
Assert.assertEquals(1L, (long) builder.ranges.poll().getMinimum());
Assert.assertEquals(4L, (long) builder.ranges.poll().getMinimum());
Assert.assertEquals(7L, (long) builder.ranges.poll().getMinimum());
RangeIterator<Long, Token> tokens = RangeUnionIterator.build(new ArrayList<RangeIterator<Long, Token>>()
{{
add(new LongIterator(new long[]{1L, 2L, 4L}));
add(new LongIterator(new long[]{3L, 5L, 6L}));
}});
Assert.assertEquals(convert(1L, 2L, 3L, 4L, 5L, 6L), convert(tokens));
FileUtils.closeQuietly(tokens);
RangeIterator emptyTokens = RangeUnionIterator.builder().build();
Assert.assertEquals(0, emptyTokens.getCount());
builder = RangeUnionIterator.builder();
Assert.assertEquals(0L, builder.add((RangeIterator<Long, Token>) null).rangeCount());
Assert.assertEquals(0L, builder.add((List<RangeIterator<Long, Token>>) null).getTokenCount());
Assert.assertEquals(0L, builder.add(new LongIterator(new long[] {})).rangeCount());
RangeIterator<Long, Token> single = new LongIterator(new long[] { 1L, 2L, 3L });
RangeIterator<Long, Token> range = RangeIntersectionIterator.<Long, Token>builder().add(single).build();
// because build should return first element if it's only one instead of building yet another iterator
Assert.assertEquals(range, single);
}
@Test
public void testSkipTo()
{
RangeUnionIterator.Builder<Long, Token> builder = RangeUnionIterator.builder();
builder.add(new LongIterator(new long[]{1L, 2L, 3L}));
builder.add(new LongIterator(new long[]{4L, 5L, 6L}));
builder.add(new LongIterator(new long[]{7L, 8L, 9L}));
RangeIterator<Long, Token> tokens = builder.build();
Assert.assertNotNull(tokens);
tokens.skipTo(5L);
Assert.assertTrue(tokens.hasNext());
Assert.assertEquals(5L, (long) tokens.next().get());
tokens.skipTo(7L);
Assert.assertTrue(tokens.hasNext());
Assert.assertEquals(7L, (long) tokens.next().get());
tokens.skipTo(10L);
Assert.assertFalse(tokens.hasNext());
Assert.assertEquals(1L, (long) tokens.getMinimum());
Assert.assertEquals(9L, (long) tokens.getMaximum());
}
@Test
public void testMergingMultipleIterators()
{
RangeUnionIterator.Builder<Long, Token> builderA = RangeUnionIterator.builder();
builderA.add(new LongIterator(new long[] { 1L, 3L, 5L }));
builderA.add(new LongIterator(new long[] { 8L, 10L, 12L }));
RangeUnionIterator.Builder<Long, Token> builderB = RangeUnionIterator.builder();
builderB.add(new LongIterator(new long[] { 7L, 9L, 11L }));
builderB.add(new LongIterator(new long[] { 2L, 4L, 6L }));
RangeIterator<Long, Token> union = RangeUnionIterator.build(Arrays.asList(builderA.build(), builderB.build()));
Assert.assertEquals(convert(1L, 2L, 3L, 4L, 5L, 6L, 7L, 8L, 9L, 10L, 11L, 12L), convert(union));
}
@Test
public void testRangeIterator()
{
LongIterator tokens = new LongIterator(new long[] { 0L, 1L, 2L, 3L });
Assert.assertEquals(0L, (long) tokens.getMinimum());
Assert.assertEquals(3L, (long) tokens.getMaximum());
for (int i = 0; i <= 3; i++)
{
Assert.assertTrue(tokens.hasNext());
Assert.assertEquals(i, (long) tokens.getCurrent());
Assert.assertEquals(i, (long) tokens.next().get());
}
tokens = new LongIterator(new long[] { 0L, 1L, 3L, 5L });
Assert.assertEquals(3L, (long) tokens.skipTo(2L).get());
Assert.assertTrue(tokens.hasNext());
Assert.assertEquals(3L, (long) tokens.getCurrent());
Assert.assertEquals(3L, (long) tokens.next().get());
Assert.assertEquals(5L, (long) tokens.skipTo(5L).get());
Assert.assertTrue(tokens.hasNext());
Assert.assertEquals(5L, (long) tokens.getCurrent());
Assert.assertEquals(5L, (long) tokens.next().get());
LongIterator empty = new LongIterator(new long[0]);
Assert.assertNull(empty.skipTo(3L));
Assert.assertFalse(empty.hasNext());
}
@Test
public void emptyRangeTest() {
RangeIterator.Builder<Long, Token> builder;
RangeIterator<Long, Token> range;
// empty, then non-empty
builder = RangeUnionIterator.builder();
builder.add(new LongIterator(new long[] {}));
for (int i = 0; i < 10; i++)
builder.add(new LongIterator(new long[] {i + 10}));
range = builder.build();
Assert.assertEquals(Long.valueOf(10), range.getMinimum());
Assert.assertEquals(Long.valueOf(19), range.getMaximum());
Assert.assertTrue(range.hasNext());
Assert.assertEquals(10, range.getCount());
builder = RangeUnionIterator.builder();
builder.add(new LongIterator(new long[] {}));
builder.add(new LongIterator(new long[] {10}));
range = builder.build();
Assert.assertEquals(Long.valueOf(10), range.getMinimum());
Assert.assertEquals(Long.valueOf(10), range.getMaximum());
Assert.assertTrue(range.hasNext());
Assert.assertEquals(1, range.getCount());
// non-empty, then empty
builder = RangeUnionIterator.builder();
for (int i = 0; i < 10; i++)
builder.add(new LongIterator(new long[] {i + 10}));
builder.add(new LongIterator(new long[] {}));
range = builder.build();
Assert.assertEquals(Long.valueOf(10), range.getMinimum());
Assert.assertEquals(Long.valueOf(19), range.getMaximum());
Assert.assertTrue(range.hasNext());
Assert.assertEquals(10, range.getCount());
builder = RangeUnionIterator.builder();
builder.add(new LongIterator(new long[] {10}));
builder.add(new LongIterator(new long[] {}));
range = builder.build();
Assert.assertEquals(Long.valueOf(10), range.getMinimum());
Assert.assertEquals(Long.valueOf(10), range.getMaximum());
Assert.assertTrue(range.hasNext());
Assert.assertEquals(1, range.getCount());
// empty, then non-empty then empty again
builder = RangeUnionIterator.builder();
builder.add(new LongIterator(new long[] {}));
for (int i = 0; i < 10; i++)
builder.add(new LongIterator(new long[] {i + 10}));
builder.add(new LongIterator(new long[] {}));
range = builder.build();
Assert.assertEquals(Long.valueOf(10), range.getMinimum());
Assert.assertEquals(Long.valueOf(19), range.getMaximum());
Assert.assertTrue(range.hasNext());
Assert.assertEquals(10, range.getCount());
// non-empty, empty, then non-empty again
builder = RangeUnionIterator.builder();
for (int i = 0; i < 5; i++)
builder.add(new LongIterator(new long[] {i + 10}));
builder.add(new LongIterator(new long[] {}));
for (int i = 5; i < 10; i++)
builder.add(new LongIterator(new long[] {i + 10}));
range = builder.build();
Assert.assertEquals(Long.valueOf(10), range.getMinimum());
Assert.assertEquals(Long.valueOf(19), range.getMaximum());
Assert.assertTrue(range.hasNext());
Assert.assertEquals(10, range.getCount());
}
}