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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vdslib;
import com.yahoo.document.BucketId;
import org.junit.Test;
import java.util.Random;
import static org.junit.Assert.assertEquals;
/**
* @author Simon Thoresen Hult
*/
public class BucketDistributionTestCase {
private static final int NUM_COLUMNS = 16;
private static final int MIN_BUCKETBITS = 4;
private static final int MAX_BUCKETBITS = 9;
@Test
public void printExpected() {
System.out.println(" int[][] expected = new int[][] {");
for (int numBucketBits = MIN_BUCKETBITS; numBucketBits <= MAX_BUCKETBITS; ++numBucketBits) {
System.out.print(" new int[] {");
BucketDistribution bd = new BucketDistribution(NUM_COLUMNS, numBucketBits);
for (int i = 0; i < bd.getNumBuckets(); ++i) {
if (i % 32 == 0) {
System.out.println();
System.out.print(" ");
}
System.out.print(bd.getColumn(new BucketId(16, i)));
if (i < bd.getNumBuckets() - 1) {
System.out.print(", ");
}
}
System.out.print(" }");
if (numBucketBits < MAX_BUCKETBITS) {
System.out.print(",");
}
System.out.println();
}
System.out.println(" };");
}
@Test
public void testDistribution() {
int[][] expected = new int[][] {
new int[] {
10, 11, 9, 6, 4, 8, 14, 1, 13, 2, 12, 3, 5, 7, 15, 0 },
new int[] {
11, 12, 11, 13, 8, 13, 8, 9, 4, 5, 6, 12, 10, 15, 1, 1, 7, 9, 14, 2, 2, 14, 3, 3, 4, 5, 6, 7, 10, 15, 0, 0 },
new int[] {
13, 13, 13, 13, 9, 11, 8, 9, 11, 14, 9, 11, 14, 14, 8, 10, 11, 14, 4, 5, 5, 6, 6, 7, 8, 10, 12, 15, 1, 1, 1, 1,
6, 7, 8, 10, 12, 15, 2, 2, 2, 2, 12, 15, 3, 3, 3, 3, 4, 4, 4, 5, 5, 6, 7, 7, 9, 10, 12, 15, 0, 0, 0, 0 },
new int[] {
14, 14, 14, 13, 11, 14, 14, 10, 13, 14, 10, 12, 8, 8, 9, 10, 9, 10, 11, 12, 13, 15, 11, 12, 13, 13, 15, 8, 8, 9, 10, 11,
11, 12, 13, 15, 4, 4, 5, 5, 5, 5, 15, 6, 6, 7, 7, 7, 8, 9, 9, 10, 11, 12, 14, 15, 1, 1, 1, 1, 1, 1, 1, 1,
6, 6, 6, 7, 7, 8, 8, 9, 10, 11, 12, 13, 15, 2, 2, 2, 2, 2, 2, 2, 2, 12, 13, 15, 3, 3, 3, 3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 7, 7, 7, 8, 9, 9, 10, 11, 12, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0 },
new int[] {
15, 14, 15, 15, 12, 14, 15, 12, 12, 11, 12, 13, 14, 13, 13, 13, 14, 15, 15, 9, 14, 9, 15, 10, 11, 11, 12, 8, 8, 8, 8, 9,
9, 10, 10, 10, 11, 11, 12, 13, 13, 14, 10, 11, 11, 12, 13, 13, 14, 13, 13, 14, 15, 7, 8, 8, 8, 9, 9, 9, 10, 10, 10, 11,
10, 10, 11, 11, 12, 13, 13, 14, 15, 4, 4, 4, 4, 15, 5, 5, 5, 5, 5, 5, 5, 15, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7,
8, 8, 8, 9, 9, 9, 10, 10, 11, 11, 12, 12, 13, 14, 14, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 11, 11, 12, 12, 13, 14, 14, 15, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 12, 12, 13, 14, 14, 15, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7,
8, 8, 8, 9, 9, 9, 10, 10, 11, 11, 12, 12, 13, 14, 15, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
new int[] {
15, 15, 15, 15, 14, 14, 15, 13, 13, 13, 13, 13, 14, 14, 15, 12, 14, 15, 15, 11, 11, 12, 13, 13, 13, 14, 14, 15, 15, 10, 12, 12,
12, 13, 13, 13, 14, 14, 15, 15, 9, 9, 9, 10, 10, 11, 11, 11, 12, 12, 12, 12, 13, 13, 14, 15, 15, 8, 8, 8, 8, 9, 9, 9,
9, 9, 9, 10, 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12, 13, 13, 14, 14, 14, 10, 10, 10, 11, 11, 11, 12, 12, 12, 12,
13, 13, 14, 14, 14, 15, 15, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11,
10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 13, 13, 13, 14, 14, 14, 15, 15, 4, 4, 4, 4, 4, 4, 4, 15, 15, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 14, 14, 14, 15, 15, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7,
8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 13, 13, 13, 14, 14, 15, 15, 15,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9,
9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 13, 13, 13, 14, 14, 14, 15, 15, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 12, 12, 12, 13, 13, 13, 14, 14, 14, 15, 15,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 13, 13, 13, 14, 14, 15, 15, 15,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
};
for (int numBucketBits = MIN_BUCKETBITS; numBucketBits <= MAX_BUCKETBITS; ++numBucketBits) {
BucketDistribution bd = new BucketDistribution(NUM_COLUMNS, numBucketBits);
assertEquals(NUM_COLUMNS, bd.getNumColumns());
assertEquals(1 << numBucketBits, bd.getNumBuckets());
for (int i = 0; i < bd.getNumBuckets(); ++i) {
assertEquals(expected[numBucketBits - MIN_BUCKETBITS][i], bd.getColumn(new BucketId(16, i)));
}
}
}
@Test
public void testNumBucketBits() {
Random rnd = new Random();
BucketDistribution bd = new BucketDistribution(1, 4);
for (int i = 0; i <= 0xf; ++i) {
assertEquals(0, bd.getColumn(new BucketId(32, (rnd.nextLong() << 4) & i)));
}
bd = new BucketDistribution(1, 8);
for (int i = 0; i <= 0xff; ++i) {
assertEquals(0, bd.getColumn(new BucketId(32, (rnd.nextLong() << 8) & i)));
}
bd = new BucketDistribution(1, 16);
for (int i = 0; i <= 0xffff; ++i) {
assertEquals(0, bd.getColumn(new BucketId(32, (rnd.nextLong() << 16) & i)));
}
}
}
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