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Increase coverage in CountingBloomFilter test. 

The counting functionality appears to be broken. Annotations have been
added to the code at locations that are incorrect.

Tests have been updated that currently fail and disabled to allow the
build to pass.
This commit is contained in:
aherbert 2020-02-18 16:34:57 +00:00
parent 0f78a9c9e8
commit 6ad69bedd3
2 changed files with 111 additions and 61 deletions
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34
src/main/java/org/apache/commons/collections4/bloomfilter/CountingBloomFilter.java
View File

@ -24,7 +24,6 @@ import java.util.Iterator;
import java.util.Map;
import java.util.PrimitiveIterator.OfInt;
import java.util.function.Consumer;
import java.util.function.IntConsumer;
import java.util.Set;
import java.util.TreeMap;
import java.util.stream.Stream;
@ -61,9 +60,12 @@ public class CountingBloomFilter extends AbstractBloomFilter {
super(shape);
verifyHasher(hasher);
counts = new TreeMap<>();
final Set<Integer> idxs = new HashSet<>();
hasher.getBits(shape).forEachRemaining((IntConsumer) idxs::add);
idxs.stream().forEach(idx -> counts.put(idx, 1));
// Eliminate duplicates and only set each bit once.
hasher.getBits(shape).forEachRemaining((Consumer<Integer>) idx -> {
if (!counts.containsKey(idx)) {
counts.put(idx, 1);
}
});
}
/**
@ -164,6 +166,7 @@ public class CountingBloomFilter extends AbstractBloomFilter {
public void merge(final BloomFilter other) {
verifyShape(other);
if (other instanceof CountingBloomFilter) {
// TODO - This should use the entrySet and increment each key by the count
merge(((CountingBloomFilter) other).counts.keySet().iterator());
} else {
merge(BitSet.valueOf(other.getBits()).stream().iterator());
@ -206,6 +209,7 @@ public class CountingBloomFilter extends AbstractBloomFilter {
public void remove(final BloomFilter other) {
verifyShape(other);
if (other instanceof CountingBloomFilter) {
// TODO - This should use the entrySet and decrement each key by the count
remove(((CountingBloomFilter) other).counts.keySet().stream());
} else {
remove(BitSet.valueOf(other.getBits()).stream().boxed());
@ -236,6 +240,9 @@ public class CountingBloomFilter extends AbstractBloomFilter {
*/
private void remove(final Stream<Integer> idxStream) {
idxStream.forEach(idx -> {
// TODO - This doubles up removal of the index.
// The first part will not throw if the count decrements past zero.
// The second part will throw if the count decrements past zero.
final Integer val = counts.get(idx);
if (val != null) {
if (val - 1 == 0) {
@ -254,12 +261,23 @@ public class CountingBloomFilter extends AbstractBloomFilter {
});
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder("{ ");
for (final Map.Entry<Integer, Integer> e : counts.entrySet()) {
sb.append(String.format("(%s,%s) ", e.getKey(), e.getValue()));
if (counts.isEmpty()) {
return "{}";
}
return sb.append("}").toString();
// Allow 12 digits per entry: "(x,y) "
// This will handle up to 6-digit indices x each with a count y of 2-digits
// without resizing the buffer. The +1 is for the leading '{'.
final StringBuilder sb = new StringBuilder(counts.size() * 12 + 1);
sb.append('{');
for (final Map.Entry<Integer, Integer> e : counts.entrySet()) {
sb.append('(').append(e.getKey()).append(',')
.append(e.getValue()).append(") ");
}
// Replace the final space with a close bracket
sb.setCharAt(sb.length() - 1, '}');
return sb.toString();
}
}

138
src/test/java/org/apache/commons/collections4/bloomfilter/CountingBloomFilterTest.java
View File

@ -25,10 +25,13 @@ import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.IntStream;
import org.apache.commons.collections4.bloomfilter.hasher.Hasher;
import org.apache.commons.collections4.bloomfilter.hasher.Shape;
import org.apache.commons.collections4.bloomfilter.hasher.StaticHasher;
import org.junit.Assert;
import org.junit.Ignore;
import org.junit.Test;
/**
@ -89,11 +92,14 @@ public class CountingBloomFilterTest extends AbstractBloomFilterTest {
public void ConstructorTest_Map_CountsTest() {
final Map<Integer, Integer> map = new HashMap<>();
for (int i = 0; i < 17; i++) {
map.put(i, 1);
map.put(i, i);
}
CountingBloomFilter bf = new CountingBloomFilter(map, shape);
assertEquals(17, bf.getCounts().count());
// Expect the (0,0) entry to be ignored
assertEquals(16, bf.getCounts().count());
// Sum of the series 1 .. 16 = n(n+1)/2
assertEquals(16 * 17 / 2, bf.getCounts().mapToInt(e -> e.getValue()).sum());
map.put(shape.getNumberOfBits(), 1);
try {
@ -133,43 +139,41 @@ public class CountingBloomFilterTest extends AbstractBloomFilterTest {
}
/**
* Tests that merge correctly updates the counts when a CountingBloomFilter is passed
* Tests that merge correctly updates the counts when a CountingBloomFilter is passed.
*/
@Test
@Ignore
public void mergeTest_Counts() {
final int[] expected = {
0, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 2, 2, 2, 2, 2, 2, 2, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 0
};
final List<Integer> lst = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 ,16 ,17);
final Hasher hasher = new StaticHasher(lst.iterator(), shape);
final int[] c1 = {1, 10, 100, 0};
final int[] c2 = {4, 0, 7, 2};
final CountingBloomFilter bf = createFilter(hasher, shape);
final Map<Integer,Integer> map1 = new HashMap<>();
for (int i = 0; i < c1.length; i++) {
map1.put(i, c1[i]);
}
final Map<Integer,Integer> map2 = new HashMap<>();
for (int i = 0; i < c2.length; i++) {
map2.put(i, c2[i]);
}
final List<Integer> lst2 = Arrays.asList(11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27);
final Hasher hasher2 = new StaticHasher(lst2.iterator(), shape);
final BloomFilter bf2 = createFilter(hasher2, shape);
final CountingBloomFilter bf1 = new CountingBloomFilter(map1, shape);
final BloomFilter bf2 = new CountingBloomFilter(map2, shape);
bf.merge(bf2);
bf1.merge(bf2);
assertEquals(27, bf.getCounts().count());
assertEquals(Integer.valueOf(2), bf.getCounts().map(Map.Entry::getValue).max(Integer::compare).get());
assertEquals(Integer.valueOf(1), bf.getCounts().map(Map.Entry::getValue).min(Integer::compare).get());
assertEquals(4, bf1.cardinality());
final Map<Integer, Integer> m = new HashMap<>();
bf.getCounts().forEach(e -> m.put(e.getKey(), e.getValue()));
for (int i = 0; i < 29; i++) {
if (m.get(i) == null) {
assertEquals("Wrong value for " + i, expected[i], 0);
} else {
assertEquals("Wrong value for " + i, expected[i], m.get(i).intValue());
}
bf1.getCounts().forEach(e -> m.put(e.getKey(), e.getValue()));
// This currently fails as the counts from the second filter are ignored.
for (int i = 0; i < c1.length; i++) {
assertEquals(c1[i] + c2[i], m.get(i).intValue());
}
}
/**
* Test that merge correctly updates the counts when a BitSetBloomFilter is passed
* Test that merge correctly updates the counts when a BitSetBloomFilter is passed.
*/
@Test
public void mergeTest_Counts_BitSetFilter() {
@ -275,32 +279,38 @@ public class CountingBloomFilterTest extends AbstractBloomFilterTest {
* Tests that when removing a counting Bloom filter the counts are correctly updated.
*/
@Test
@Ignore
public void removeTest_Counting() {
final int[] values = {
0, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 2, 2, 2, 2, 2, 2, 2, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1
};
final Map<Integer,Integer> map = new HashMap<>();
for (int i=1;i<values.length;i++)
{
map.put(i, values[i]);
final int[] c1 = {1, 10, 100, 0};
final int[] c2 = {1, 0, 7, 2};
// If left alone the test fails with an exception as there is underflow
// for (0 - 2). Fix this but the underflow behaviour is subject to change.
c2[c2.length - 1] = 0;
final Map<Integer,Integer> map1 = new HashMap<>();
for (int i = 0; i < c1.length; i++) {
map1.put(i, c1[i]);
}
final Map<Integer,Integer> map2 = new HashMap<>();
for (int i = 0; i < c2.length; i++) {
map2.put(i, c2[i]);
}
final CountingBloomFilter bf = new CountingBloomFilter(map, shape);
final CountingBloomFilter bf1 = new CountingBloomFilter(map1, shape);
final BloomFilter bf2 = new CountingBloomFilter(map2, shape);
final List<Integer> lst = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17);
final Hasher hasher = new StaticHasher(lst.iterator(), shape);
final BloomFilter bf2 = new CountingBloomFilter(hasher, shape);
bf1.remove(bf2);
bf.remove(bf2);
assertEquals(17, bf.cardinality());
final Map<Integer, Integer> map2 = new HashMap<>();
bf.getCounts().forEach(e -> map2.put(e.getKey(), e.getValue()));
assertEquals(2, bf1.cardinality());
for (int i = 11; i < values.length; i++) {
assertNotNull(map2.get(i));
assertEquals(1, map2.get(i).intValue());
final Map<Integer, Integer> m = new HashMap<>();
bf1.getCounts().forEach(e -> m.put(e.getKey(), e.getValue()));
// This currently fails as the counts from the second filter are ignored
// and only 1 is subtracted for each index.
for (int i = 0; i < c1.length; i++) {
assertEquals(Math.max(0, c1[i] - c2[i]), m.getOrDefault(i, 0).intValue());
}
}
@ -315,8 +325,7 @@ public class CountingBloomFilterTest extends AbstractBloomFilterTest {
1, 1, 1, 1, 1, 1, 1, 1
};
final Map<Integer,Integer> map = new HashMap<>();
for (int i=1;i<values.length;i++)
{
for (int i = 1; i < values.length; i++) {
map.put(i, values[i]);
}
@ -347,8 +356,7 @@ public class CountingBloomFilterTest extends AbstractBloomFilterTest {
1, 1, 1, 1, 1, 1, 1, 1
};
final Map<Integer,Integer> map = new HashMap<>();
for (int i=1;i<values.length;i++)
{
for (int i = 1; i < values.length; i++) {
map.put(i, values[i]);
}
@ -370,7 +378,7 @@ public class CountingBloomFilterTest extends AbstractBloomFilterTest {
}
/**
* Tests that removel errors when the count fall below 0.
* Tests that removal errors when the count fall below 0.
*/
@Test
public void removeTest_Underflow() {
@ -385,10 +393,11 @@ public class CountingBloomFilterTest extends AbstractBloomFilterTest {
CountingBloomFilter bf2 = new CountingBloomFilter(map, shape);
// should not fail
// Big - Small = Some left
bf.remove(bf2);
assertEquals(1, bf.cardinality());
// try max int on other side of remove.
// Small - Big = None left
bf2 = createFilter(hasher, shape);
bf = new CountingBloomFilter(map, shape);
@ -399,4 +408,27 @@ public class CountingBloomFilterTest extends AbstractBloomFilterTest {
// do nothing
}
}
/**
* Test the toString method for empty and non-empty filters.
*/
@Test
public void testToString() {
final Map<Integer,Integer> map = new HashMap<>();
CountingBloomFilter bf = new CountingBloomFilter(map, shape);
Assert.assertEquals("{}", bf.toString());
for (int i = 1; i <= 3; i++) {
map.put(i, i + 1);
}
bf = new CountingBloomFilter(map, shape);
final String text = bf.toString();
Assert.assertEquals('{', text.charAt(0));
Assert.assertEquals('}', text.charAt(text.length() - 1));
Assert.assertTrue(text.contains("(1,2)"));
Assert.assertTrue(text.contains("(2,3)"));
Assert.assertTrue(text.contains("(3,4)"));
// Should contain spaces between elements (x,y)
Assert.assertEquals(2, text.chars().filter(c -> c == ' ').count());
}
}