/*
* Copyright (C) 2011 The Guava Authors
*
* Licensed 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 com.google.common.collect;
import static com.google.common.collect.MapMakerInternalMap.DRAIN_THRESHOLD;
import static com.google.common.truth.Truth.assertThat;
import com.google.common.base.Equivalence;
import com.google.common.collect.MapMakerInternalMap.InternalEntry;
import com.google.common.collect.MapMakerInternalMap.Segment;
import com.google.common.collect.MapMakerInternalMap.Strength;
import com.google.common.collect.MapMakerInternalMap.WeakValueEntry;
import com.google.common.collect.MapMakerInternalMap.WeakValueReference;
import com.google.common.testing.NullPointerTester;
import java.lang.ref.Reference;
import java.util.concurrent.atomic.AtomicReferenceArray;
import junit.framework.TestCase;
/**
* @author Charles Fry
*/
@SuppressWarnings("deprecation") // many tests of deprecated methods
public class MapMakerInternalMapTest extends TestCase {
static final int SMALL_MAX_SIZE = DRAIN_THRESHOLD * 5;
private static <K, V>
MapMakerInternalMap<K, V, ? extends InternalEntry<K, V, ?>, ? extends Segment<K, V, ?, ?>>
makeMap(MapMaker maker) {
return MapMakerInternalMap.create(maker);
}
private static MapMaker createMapMaker() {
MapMaker maker = new MapMaker();
maker.useCustomMap = true;
return maker;
}
// constructor tests
public void testDefaults() {
MapMakerInternalMap<Object, Object, ?, ?> map = makeMap(createMapMaker());
assertSame(Strength.STRONG, map.keyStrength());
assertSame(Strength.STRONG, map.valueStrength());
assertSame(map.keyStrength().defaultEquivalence(), map.keyEquivalence);
assertSame(map.valueStrength().defaultEquivalence(), map.valueEquivalence());
assertThat(map.entryHelper)
.isInstanceOf(MapMakerInternalMap.StrongKeyStrongValueEntry.Helper.class);
assertEquals(4, map.concurrencyLevel);
// concurrency level
assertThat(map.segments).hasLength(4);
// initial capacity / concurrency level
assertEquals(16 / map.segments.length, map.segments[0].table.length());
}
public void testSetKeyEquivalence() {
Equivalence<Object> testEquivalence = new Equivalence<Object>() {
@Override
protected boolean doEquivalent(Object a, Object b) {
return false;
}
@Override
protected int doHash(Object t) {
return 0;
}
};
MapMakerInternalMap<Object, Object, ?, ?> map =
makeMap(createMapMaker().keyEquivalence(testEquivalence));
assertSame(testEquivalence, map.keyEquivalence);
assertSame(map.valueStrength().defaultEquivalence(), map.valueEquivalence());
}
public void testSetConcurrencyLevel() {
// round up to nearest power of two
checkConcurrencyLevel(1, 1);
checkConcurrencyLevel(2, 2);
checkConcurrencyLevel(3, 4);
checkConcurrencyLevel(4, 4);
checkConcurrencyLevel(5, 8);
checkConcurrencyLevel(6, 8);
checkConcurrencyLevel(7, 8);
checkConcurrencyLevel(8, 8);
}
private static void checkConcurrencyLevel(int concurrencyLevel, int segmentCount) {
MapMakerInternalMap<Object, Object, ?, ?> map =
makeMap(createMapMaker().concurrencyLevel(concurrencyLevel));
assertThat(map.segments).hasLength(segmentCount);
}
public void testSetInitialCapacity() {
// share capacity over each segment, then round up to nearest power of two
checkInitialCapacity(1, 0, 1);
checkInitialCapacity(1, 1, 1);
checkInitialCapacity(1, 2, 2);
checkInitialCapacity(1, 3, 4);
checkInitialCapacity(1, 4, 4);
checkInitialCapacity(1, 5, 8);
checkInitialCapacity(1, 6, 8);
checkInitialCapacity(1, 7, 8);
checkInitialCapacity(1, 8, 8);
checkInitialCapacity(2, 0, 1);
checkInitialCapacity(2, 1, 1);
checkInitialCapacity(2, 2, 1);
checkInitialCapacity(2, 3, 2);
checkInitialCapacity(2, 4, 2);
checkInitialCapacity(2, 5, 4);
checkInitialCapacity(2, 6, 4);
checkInitialCapacity(2, 7, 4);
checkInitialCapacity(2, 8, 4);
checkInitialCapacity(4, 0, 1);
checkInitialCapacity(4, 1, 1);
checkInitialCapacity(4, 2, 1);
checkInitialCapacity(4, 3, 1);
checkInitialCapacity(4, 4, 1);
checkInitialCapacity(4, 5, 2);
checkInitialCapacity(4, 6, 2);
checkInitialCapacity(4, 7, 2);
checkInitialCapacity(4, 8, 2);
}
private static void checkInitialCapacity(
int concurrencyLevel, int initialCapacity, int segmentSize) {
MapMakerInternalMap<Object, Object, ?, ?> map =
makeMap(
createMapMaker().concurrencyLevel(concurrencyLevel).initialCapacity(initialCapacity));
for (int i = 0; i < map.segments.length; i++) {
assertEquals(segmentSize, map.segments[i].table.length());
}
}
public void testSetMaximumSize() {
// vary maximumSize wrt concurrencyLevel
for (int maxSize = 1; maxSize < 8; maxSize++) {
checkMaximumSize(1, 8, maxSize);
checkMaximumSize(2, 8, maxSize);
checkMaximumSize(4, 8, maxSize);
checkMaximumSize(8, 8, maxSize);
}
checkMaximumSize(1, 8, Integer.MAX_VALUE);
checkMaximumSize(2, 8, Integer.MAX_VALUE);
checkMaximumSize(4, 8, Integer.MAX_VALUE);
checkMaximumSize(8, 8, Integer.MAX_VALUE);
// vary initial capacity wrt maximumSize
for (int capacity = 0; capacity < 8; capacity++) {
checkMaximumSize(1, capacity, 4);
checkMaximumSize(2, capacity, 4);
checkMaximumSize(4, capacity, 4);
checkMaximumSize(8, capacity, 4);
}
}
private static void checkMaximumSize(int concurrencyLevel, int initialCapacity, int maxSize) {
MapMakerInternalMap<Object, Object, ?, ?> map =
makeMap(
createMapMaker().concurrencyLevel(concurrencyLevel).initialCapacity(initialCapacity));
int totalCapacity = 0;
for (int i = 0; i < map.segments.length; i++) {
totalCapacity += map.segments[i].maxSegmentSize;
}
assertTrue("totalCapcity=" + totalCapacity + ", maxSize=" + maxSize, totalCapacity <= maxSize);
}
public void testSetWeakKeys() {
MapMakerInternalMap<Object, Object, ?, ?> map = makeMap(createMapMaker().weakKeys());
checkStrength(map, Strength.WEAK, Strength.STRONG);
assertThat(map.entryHelper)
.isInstanceOf(MapMakerInternalMap.WeakKeyStrongValueEntry.Helper.class);
}
public void testSetWeakValues() {
MapMakerInternalMap<Object, Object, ?, ?> map = makeMap(createMapMaker().weakValues());
checkStrength(map, Strength.STRONG, Strength.WEAK);
assertThat(map.entryHelper)
.isInstanceOf(MapMakerInternalMap.StrongKeyWeakValueEntry.Helper.class);
}
private static void checkStrength(
MapMakerInternalMap<Object, Object, ?, ?> map, Strength keyStrength, Strength valueStrength) {
assertSame(keyStrength, map.keyStrength());
assertSame(valueStrength, map.valueStrength());
assertSame(keyStrength.defaultEquivalence(), map.keyEquivalence);
assertSame(valueStrength.defaultEquivalence(), map.valueEquivalence());
}
// Segment core tests
public void testNewEntry() {
for (MapMaker maker : allWeakValueStrengthMakers()) {
MapMakerInternalMap<Object, Object, ?, ?> map = makeMap(maker);
Segment<Object, Object, ?, ?> segment = map.segments[0];
Object keyOne = new Object();
Object valueOne = new Object();
int hashOne = map.hash(keyOne);
InternalEntry<Object, Object, ?> entryOne = segment.newEntryForTesting(keyOne, hashOne, null);
WeakValueReference<Object, Object, ?> valueRefOne =
segment.newWeakValueReferenceForTesting(entryOne, valueOne);
assertSame(valueOne, valueRefOne.get());
segment.setWeakValueReferenceForTesting(entryOne, valueRefOne);
assertSame(keyOne, entryOne.getKey());
assertEquals(hashOne, entryOne.getHash());
assertNull(entryOne.getNext());
assertSame(valueRefOne, segment.getWeakValueReferenceForTesting(entryOne));
Object keyTwo = new Object();
Object valueTwo = new Object();
int hashTwo = map.hash(keyTwo);
InternalEntry<Object, Object, ?> entryTwo =
segment.newEntryForTesting(keyTwo, hashTwo, entryOne);
WeakValueReference<Object, Object, ?> valueRefTwo =
segment.newWeakValueReferenceForTesting(entryTwo, valueTwo);
assertSame(valueTwo, valueRefTwo.get());
segment.setWeakValueReferenceForTesting(entryTwo, valueRefTwo);
assertSame(keyTwo, entryTwo.getKey());
assertEquals(hashTwo, entryTwo.getHash());
assertSame(entryOne, entryTwo.getNext());
assertSame(valueRefTwo, segment.getWeakValueReferenceForTesting(entryTwo));
}
}
public void testCopyEntry() {
for (MapMaker maker : allWeakValueStrengthMakers()) {
MapMakerInternalMap<Object, Object, ?, ?> map = makeMap(maker);
Segment<Object, Object, ?, ?> segment = map.segments[0];
Object keyOne = new Object();
Object valueOne = new Object();
int hashOne = map.hash(keyOne);
InternalEntry<Object, Object, ?> entryOne = segment.newEntryForTesting(keyOne, hashOne, null);
segment.setValueForTesting(entryOne, valueOne);
Object keyTwo = new Object();
Object valueTwo = new Object();
int hashTwo = map.hash(keyTwo);
InternalEntry<Object, Object, ?> entryTwo = segment.newEntryForTesting(keyTwo, hashTwo, null);
segment.setValueForTesting(entryTwo, valueTwo);
InternalEntry<Object, Object, ?> copyOne = segment.copyForTesting(entryOne, null);
assertSame(keyOne, entryOne.getKey());
assertEquals(hashOne, entryOne.getHash());
assertNull(entryOne.getNext());
assertSame(valueOne, copyOne.getValue());
InternalEntry<Object, Object, ?> copyTwo = segment.copyForTesting(entryTwo, copyOne);
assertSame(keyTwo, copyTwo.getKey());
assertEquals(hashTwo, copyTwo.getHash());
assertSame(copyOne, copyTwo.getNext());
assertSame(valueTwo, copyTwo.getValue());
}
}
public void testSegmentGetAndContains() {
MapMakerInternalMap<Object, Object, ?, ?> map =
makeMap(createMapMaker().concurrencyLevel(1).weakValues());
Segment<Object, Object, ?, ?> segment = map.segments[0];
// TODO(fry): check recency ordering
Object key = new Object();
int hash = map.hash(key);
Object value = new Object();
AtomicReferenceArray<? extends InternalEntry<Object, Object, ?>> table = segment.table;
int index = hash & (table.length() - 1);
InternalEntry<Object, Object, ?> entry = segment.newEntryForTesting(key, hash, null);
segment.setValueForTesting(entry, value);
assertNull(segment.get(key, hash));
// count == 0
segment.setTableEntryForTesting(index, entry);
assertNull(segment.get(key, hash));
assertFalse(segment.containsKey(key, hash));
assertFalse(segment.containsValue(value));
// count == 1
segment.count++;
assertSame(value, segment.get(key, hash));
assertTrue(segment.containsKey(key, hash));
assertTrue(segment.containsValue(value));
// don't see absent values now that count > 0
assertNull(segment.get(new Object(), hash));
// null key
InternalEntry<Object, Object, ?> nullEntry = segment.newEntryForTesting(null, hash, entry);
Object nullValue = new Object();
WeakValueReference<Object, Object, ?> nullValueRef =
segment.newWeakValueReferenceForTesting(nullEntry, nullValue);
segment.setWeakValueReferenceForTesting(nullEntry, nullValueRef);
segment.setTableEntryForTesting(index, nullEntry);
// skip the null key
assertSame(value, segment.get(key, hash));
assertTrue(segment.containsKey(key, hash));
assertTrue(segment.containsValue(value));
assertFalse(segment.containsValue(nullValue));
// hash collision
InternalEntry<Object, Object, ?> dummyEntry =
segment.newEntryForTesting(new Object(), hash, entry);
Object dummyValue = new Object();
WeakValueReference<Object, Object, ?> dummyValueRef =
segment.newWeakValueReferenceForTesting(dummyEntry, dummyValue);
segment.setWeakValueReferenceForTesting(dummyEntry, dummyValueRef);
segment.setTableEntryForTesting(index, dummyEntry);
assertSame(value, segment.get(key, hash));
assertTrue(segment.containsKey(key, hash));
assertTrue(segment.containsValue(value));
assertTrue(segment.containsValue(dummyValue));
// key collision
dummyEntry = segment.newEntryForTesting(key, hash, entry);
dummyValue = new Object();
dummyValueRef = segment.newWeakValueReferenceForTesting(dummyEntry, dummyValue);
segment.setWeakValueReferenceForTesting(dummyEntry, dummyValueRef);
segment.setTableEntryForTesting(index, dummyEntry);
// returns the most recent entry
assertSame(dummyValue, segment.get(key, hash));
assertTrue(segment.containsKey(key, hash));
assertTrue(segment.containsValue(value));
assertTrue(segment.containsValue(dummyValue));
}
public void testSegmentReplaceValue() {
MapMakerInternalMap<Object, Object, ?, ?> map =
makeMap(createMapMaker().concurrencyLevel(1).weakValues());
Segment<Object, Object, ?, ?> segment = map.segments[0];
// TODO(fry): check recency ordering
Object key = new Object();
int hash = map.hash(key);
Object oldValue = new Object();
Object newValue = new Object();
AtomicReferenceArray<? extends InternalEntry<Object, Object, ?>> table = segment.table;
int index = hash & (table.length() - 1);
InternalEntry<Object, Object, ?> entry = segment.newEntryForTesting(key, hash, null);
WeakValueReference<Object, Object, ?> oldValueRef =
segment.newWeakValueReferenceForTesting(entry, oldValue);
segment.setWeakValueReferenceForTesting(entry, oldValueRef);
// no entry
assertFalse(segment.replace(key, hash, oldValue, newValue));
assertEquals(0, segment.count);
// same value
segment.setTableEntryForTesting(index, entry);
segment.count++;
assertEquals(1, segment.count);
assertSame(oldValue, segment.get(key, hash));
assertTrue(segment.replace(key, hash, oldValue, newValue));
assertEquals(1, segment.count);
assertSame(newValue, segment.get(key, hash));
// different value
assertFalse(segment.replace(key, hash, oldValue, newValue));
assertEquals(1, segment.count);
assertSame(newValue, segment.get(key, hash));
// cleared
segment.setWeakValueReferenceForTesting(entry, oldValueRef);
oldValueRef.clear();
assertFalse(segment.replace(key, hash, oldValue, newValue));
assertEquals(0, segment.count);
assertNull(segment.get(key, hash));
}
public void testSegmentReplace() {
MapMakerInternalMap<Object, Object, ?, ?> map =
makeMap(createMapMaker().concurrencyLevel(1).weakValues());
Segment<Object, Object, ?, ?> segment = map.segments[0];
// TODO(fry): check recency ordering
Object key = new Object();
int hash = map.hash(key);
Object oldValue = new Object();
Object newValue = new Object();
AtomicReferenceArray<? extends InternalEntry<Object, Object, ?>> table = segment.table;
int index = hash & (table.length() - 1);
InternalEntry<Object, Object, ?> entry = segment.newEntryForTesting(key, hash, null);
WeakValueReference<Object, Object, ?> oldValueRef =
segment.newWeakValueReferenceForTesting(entry, oldValue);
segment.setWeakValueReferenceForTesting(entry, oldValueRef);
// no entry
assertNull(segment.replace(key, hash, newValue));
assertEquals(0, segment.count);
// same key
segment.setTableEntryForTesting(index, entry);
segment.count++;
assertEquals(1, segment.count);
assertSame(oldValue, segment.get(key, hash));
assertSame(oldValue, segment.replace(key, hash, newValue));
assertEquals(1, segment.count);
assertSame(newValue, segment.get(key, hash));
// cleared
segment.setWeakValueReferenceForTesting(entry, oldValueRef);
oldValueRef.clear();
assertNull(segment.replace(key, hash, newValue));
assertEquals(0, segment.count);
assertNull(segment.get(key, hash));
}
public void testSegmentPut() {
MapMakerInternalMap<Object, Object, ?, ?> map =
makeMap(createMapMaker().concurrencyLevel(1).weakValues());
Segment<Object, Object, ?, ?> segment = map.segments[0];
// TODO(fry): check recency ordering
Object key = new Object();
int hash = map.hash(key);
Object oldValue = new Object();
Object newValue = new Object();
// no entry
assertEquals(0, segment.count);
assertNull(segment.put(key, hash, oldValue, false));
assertEquals(1, segment.count);
// same key
assertSame(oldValue, segment.put(key, hash, newValue, false));
assertEquals(1, segment.count);
assertSame(newValue, segment.get(key, hash));
// cleared
InternalEntry<Object, Object, ?> entry = segment.getEntry(key, hash);
WeakValueReference<Object, Object, ?> oldValueRef =
segment.newWeakValueReferenceForTesting(entry, oldValue);
segment.setWeakValueReferenceForTesting(entry, oldValueRef);
assertSame(oldValue, segment.get(key, hash));
oldValueRef.clear();
assertNull(segment.put(key, hash, newValue, false));
assertEquals(1, segment.count);
assertSame(newValue, segment.get(key, hash));
}
public void testSegmentPutIfAbsent() {
MapMakerInternalMap<Object, Object, ?, ?> map =
makeMap(createMapMaker().concurrencyLevel(1).weakValues());
Segment<Object, Object, ?, ?> segment = map.segments[0];
// TODO(fry): check recency ordering
Object key = new Object();
int hash = map.hash(key);
Object oldValue = new Object();
Object newValue = new Object();
// no entry
assertEquals(0, segment.count);
assertNull(segment.put(key, hash, oldValue, true));
assertEquals(1, segment.count);
// same key
assertSame(oldValue, segment.put(key, hash, newValue, true));
assertEquals(1, segment.count);
assertSame(oldValue, segment.get(key, hash));
// cleared
InternalEntry<Object, Object, ?> entry = segment.getEntry(key, hash);
WeakValueReference<Object, Object, ?> oldValueRef =
segment.newWeakValueReferenceForTesting(entry, oldValue);
segment.setWeakValueReferenceForTesting(entry, oldValueRef);
assertSame(oldValue, segment.get(key, hash));
oldValueRef.clear();
assertNull(segment.put(key, hash, newValue, true));
assertEquals(1, segment.count);
assertSame(newValue, segment.get(key, hash));
}
public void testSegmentPut_expand() {
MapMakerInternalMap<Object, Object, ?, ?> map =
makeMap(createMapMaker().concurrencyLevel(1).initialCapacity(1));
Segment<Object, Object, ?, ?> segment = map.segments[0];
assertEquals(1, segment.table.length());
int count = 1024;
for (int i = 0; i < count; i++) {
Object key = new Object();
Object value = new Object();
int hash = map.hash(key);
assertNull(segment.put(key, hash, value, false));
assertTrue(segment.table.length() > i);
}
}
public void testSegmentRemove() {
MapMakerInternalMap<Object, Object, ?, ?> map =
makeMap(createMapMaker().concurrencyLevel(1).weakValues());
Segment<Object, Object, ?, ?> segment = map.segments[0];
Object key = new Object();
int hash = map.hash(key);
Object oldValue = new Object();
AtomicReferenceArray<? extends InternalEntry<Object, Object, ?>> table = segment.table;
int index = hash & (table.length() - 1);
InternalEntry<Object, Object, ?> entry = segment.newEntryForTesting(key, hash, null);
WeakValueReference<Object, Object, ?> oldValueRef =
segment.newWeakValueReferenceForTesting(entry, oldValue);
segment.setWeakValueReferenceForTesting(entry, oldValueRef);
// no entry
assertEquals(0, segment.count);
assertNull(segment.remove(key, hash));
assertEquals(0, segment.count);
// same key
segment.setTableEntryForTesting(index, entry);
segment.count++;
assertEquals(1, segment.count);
assertSame(oldValue, segment.get(key, hash));
assertSame(oldValue, segment.remove(key, hash));
assertEquals(0, segment.count);
assertNull(segment.get(key, hash));
// cleared
segment.setTableEntryForTesting(index, entry);
segment.count++;
assertEquals(1, segment.count);
assertSame(oldValue, segment.get(key, hash));
oldValueRef.clear();
assertNull(segment.remove(key, hash));
assertEquals(0, segment.count);
assertNull(segment.get(key, hash));
}
public void testSegmentRemoveValue() {
MapMakerInternalMap<Object, Object, ?, ?> map =
makeMap(createMapMaker().concurrencyLevel(1).weakValues());
Segment<Object, Object, ?, ?> segment = map.segments[0];
Object key = new Object();
int hash = map.hash(key);
Object oldValue = new Object();
Object newValue = new Object();
AtomicReferenceArray<? extends InternalEntry<Object, Object, ?>> table = segment.table;
int index = hash & (table.length() - 1);
InternalEntry<Object, Object, ?> entry = segment.newEntryForTesting(key, hash, null);
WeakValueReference<Object, Object, ?> oldValueRef =
segment.newWeakValueReferenceForTesting(entry, oldValue);
segment.setWeakValueReferenceForTesting(entry, oldValueRef);
// no entry
assertEquals(0, segment.count);
assertNull(segment.remove(key, hash));
assertEquals(0, segment.count);
// same value
segment.setTableEntryForTesting(index, entry);
segment.count++;
assertEquals(1, segment.count);
assertSame(oldValue, segment.get(key, hash));
assertTrue(segment.remove(key, hash, oldValue));
assertEquals(0, segment.count);
assertNull(segment.get(key, hash));
// different value
segment.setTableEntryForTesting(index, entry);
segment.count++;
assertEquals(1, segment.count);
assertSame(oldValue, segment.get(key, hash));
assertFalse(segment.remove(key, hash, newValue));
assertEquals(1, segment.count);
assertSame(oldValue, segment.get(key, hash));
// cleared
assertSame(oldValue, segment.get(key, hash));
oldValueRef.clear();
assertFalse(segment.remove(key, hash, oldValue));
assertEquals(0, segment.count);
assertNull(segment.get(key, hash));
}
public void testExpand() {
MapMakerInternalMap<Object, Object, ?, ?> map =
makeMap(createMapMaker().concurrencyLevel(1).initialCapacity(1));
Segment<Object, Object, ?, ?> segment = map.segments[0];
assertEquals(1, segment.table.length());
// manually add elements to avoid expansion
int originalCount = 1024;
InternalEntry<Object, Object, ?> entry = null;
for (int i = 0; i < originalCount; i++) {
Object key = new Object();
Object value = new Object();
int hash = map.hash(key);
// chain all entries together as we only have a single bucket
entry = segment.newEntryForTesting(key, hash, entry);
segment.setValueForTesting(entry, value);
}
segment.setTableEntryForTesting(0, entry);
segment.count = originalCount;
ImmutableMap<Object, Object> originalMap = ImmutableMap.copyOf(map);
assertEquals(originalCount, originalMap.size());
assertEquals(originalMap, map);
for (int i = 1; i <= originalCount * 2; i *= 2) {
if (i > 1) {
segment.expand();
}
assertEquals(i, segment.table.length());
assertEquals(originalCount, countLiveEntries(map));
assertEquals(originalCount, segment.count);
assertEquals(originalMap, map);
}
}
public void testRemoveFromChain() {
MapMakerInternalMap<Object, Object, ?, ?> map = makeMap(createMapMaker().concurrencyLevel(1));
Segment<Object, Object, ?, ?> segment = map.segments[0];
// create 3 objects and chain them together
Object keyOne = new Object();
Object valueOne = new Object();
int hashOne = map.hash(keyOne);
InternalEntry<Object, Object, ?> entryOne = segment.newEntryForTesting(keyOne, hashOne, null);
segment.setValueForTesting(entryOne, valueOne);
Object keyTwo = new Object();
Object valueTwo = new Object();
int hashTwo = map.hash(keyTwo);
InternalEntry<Object, Object, ?> entryTwo =
segment.newEntryForTesting(keyTwo, hashTwo, entryOne);
segment.setValueForTesting(entryTwo, valueTwo);
Object keyThree = new Object();
Object valueThree = new Object();
int hashThree = map.hash(keyThree);
InternalEntry<Object, Object, ?> entryThree =
segment.newEntryForTesting(keyThree, hashThree, entryTwo);
segment.setValueForTesting(entryThree, valueThree);
// alone
assertNull(segment.removeFromChainForTesting(entryOne, entryOne));
// head
assertSame(entryOne, segment.removeFromChainForTesting(entryTwo, entryTwo));
// middle
InternalEntry<Object, Object, ?> newFirst =
segment.removeFromChainForTesting(entryThree, entryTwo);
assertSame(keyThree, newFirst.getKey());
assertSame(valueThree, newFirst.getValue());
assertEquals(hashThree, newFirst.getHash());
assertSame(entryOne, newFirst.getNext());
// tail (remaining entries are copied in reverse order)
newFirst = segment.removeFromChainForTesting(entryThree, entryOne);
assertSame(keyTwo, newFirst.getKey());
assertSame(valueTwo, newFirst.getValue());
assertEquals(hashTwo, newFirst.getHash());
newFirst = newFirst.getNext();
assertSame(keyThree, newFirst.getKey());
assertSame(valueThree, newFirst.getValue());
assertEquals(hashThree, newFirst.getHash());
assertNull(newFirst.getNext());
}
public void testExpand_cleanup() {
MapMakerInternalMap<Object, Object, ?, ?> map =
makeMap(createMapMaker().concurrencyLevel(1).initialCapacity(1));
Segment<Object, Object, ?, ?> segment = map.segments[0];
assertEquals(1, segment.table.length());
// manually add elements to avoid expansion
// 1/3 null keys, 1/3 null values
int originalCount = 1024;
InternalEntry<Object, Object, ?> entry = null;
for (int i = 0; i < originalCount; i++) {
Object key = new Object();
Object value = (i % 3 == 0) ? null : new Object();
int hash = map.hash(key);
if (i % 3 == 1) {
key = null;
}
// chain all entries together as we only have a single bucket
entry = segment.newEntryForTesting(key, hash, entry);
segment.setValueForTesting(entry, value);
}
segment.setTableEntryForTesting(0, entry);
segment.count = originalCount;
int liveCount = originalCount / 3;
assertEquals(1, segment.table.length());
assertEquals(liveCount, countLiveEntries(map));
ImmutableMap<Object, Object> originalMap = ImmutableMap.copyOf(map);
assertEquals(liveCount, originalMap.size());
// can't compare map contents until cleanup occurs
for (int i = 1; i <= originalCount * 2; i *= 2) {
if (i > 1) {
segment.expand();
}
assertEquals(i, segment.table.length());
assertEquals(liveCount, countLiveEntries(map));
// expansion cleanup is sloppy, with a goal of avoiding unnecessary copies
assertTrue(segment.count >= liveCount);
assertTrue(segment.count <= originalCount);
assertEquals(originalMap, ImmutableMap.copyOf(map));
}
}
private static <K, V> int countLiveEntries(MapMakerInternalMap<K, V, ?, ?> map) {
int result = 0;
for (Segment<K, V, ?, ?> segment : map.segments) {
AtomicReferenceArray<? extends InternalEntry<K, V, ?>> table = segment.table;
for (int i = 0; i < table.length(); i++) {
for (InternalEntry<K, V, ?> e = table.get(i); e != null; e = e.getNext()) {
if (map.isLiveForTesting(e)) {
result++;
}
}
}
}
return result;
}
public void testClear() {
MapMakerInternalMap<Object, Object, ?, ?> map =
makeMap(createMapMaker().concurrencyLevel(1).initialCapacity(1));
Segment<Object, Object, ?, ?> segment = map.segments[0];
AtomicReferenceArray<? extends InternalEntry<Object, Object, ?>> table = segment.table;
assertEquals(1, table.length());
Object key = new Object();
Object value = new Object();
int hash = map.hash(key);
InternalEntry<Object, Object, ?> entry = segment.newEntryForTesting(key, hash, null);
segment.setValueForTesting(entry, value);
segment.setTableEntryForTesting(0, entry);
segment.readCount.incrementAndGet();
segment.count = 1;
assertSame(entry, table.get(0));
segment.clear();
assertNull(table.get(0));
assertEquals(0, segment.readCount.get());
assertEquals(0, segment.count);
}
public void testRemoveEntry() {
MapMakerInternalMap<Object, Object, ?, ?> map =
makeMap(createMapMaker().concurrencyLevel(1).initialCapacity(1));
Segment<Object, Object, ?, ?> segment = map.segments[0];
AtomicReferenceArray<? extends InternalEntry<Object, Object, ?>> table = segment.table;
assertEquals(1, table.length());
Object key = new Object();
Object value = new Object();
int hash = map.hash(key);
InternalEntry<Object, Object, ?> entry = segment.newEntryForTesting(key, hash, null);
segment.setValueForTesting(entry, value);
// remove absent
assertFalse(segment.removeTableEntryForTesting(entry));
segment.setTableEntryForTesting(0, entry);
segment.count = 1;
assertTrue(segment.removeTableEntryForTesting(entry));
assertEquals(0, segment.count);
assertNull(table.get(0));
}
public void testClearValue() {
MapMakerInternalMap<Object, Object, ?, ?> map =
makeMap(createMapMaker().concurrencyLevel(1).initialCapacity(1).weakValues());
Segment<Object, Object, ?, ?> segment = map.segments[0];
AtomicReferenceArray<? extends InternalEntry<Object, Object, ?>> table = segment.table;
assertEquals(1, table.length());
Object key = new Object();
Object value = new Object();
int hash = map.hash(key);
InternalEntry<Object, Object, ?> entry = segment.newEntryForTesting(key, hash, null);
segment.setValueForTesting(entry, value);
WeakValueReference<Object, Object, ?> valueRef = segment.getWeakValueReferenceForTesting(entry);
// clear absent
assertFalse(segment.clearValueForTesting(key, hash, valueRef));
segment.setTableEntryForTesting(0, entry);
// don't increment count; this is used during computation
assertTrue(segment.clearValueForTesting(key, hash, valueRef));
// no notification sent with clearValue
assertEquals(0, segment.count);
assertNull(table.get(0));
// clear wrong value reference
segment.setTableEntryForTesting(0, entry);
WeakValueReference<Object, Object, ?> otherValueRef =
segment.newWeakValueReferenceForTesting(entry, value);
segment.setWeakValueReferenceForTesting(entry, otherValueRef);
assertFalse(segment.clearValueForTesting(key, hash, valueRef));
segment.setWeakValueReferenceForTesting(entry, valueRef);
assertTrue(segment.clearValueForTesting(key, hash, valueRef));
}
// reference queues
public void testDrainKeyReferenceQueueOnWrite() {
for (MapMaker maker : allWeakKeyStrengthMakers()) {
MapMakerInternalMap<Object, Object, ?, ?> map = makeMap(maker.concurrencyLevel(1));
if (maker.getKeyStrength() == Strength.WEAK) {
Segment<Object, Object, ?, ?> segment = map.segments[0];
Object keyOne = new Object();
int hashOne = map.hash(keyOne);
Object valueOne = new Object();
Object keyTwo = new Object();
Object valueTwo = new Object();
map.put(keyOne, valueOne);
InternalEntry<Object, Object, ?> entry = segment.getEntry(keyOne, hashOne);
@SuppressWarnings("unchecked")
Reference<Object> reference = (Reference) entry;
reference.enqueue();
map.put(keyTwo, valueTwo);
assertFalse(map.containsKey(keyOne));
assertFalse(map.containsValue(valueOne));
assertNull(map.get(keyOne));
assertEquals(1, map.size());
assertNull(segment.getKeyReferenceQueueForTesting().poll());
}
}
}
public void testDrainValueReferenceQueueOnWrite() {
for (MapMaker maker : allWeakValueStrengthMakers()) {
MapMakerInternalMap<Object, Object, ?, ?> map = makeMap(maker.concurrencyLevel(1));
if (maker.getValueStrength() == Strength.WEAK) {
Segment<Object, Object, ?, ?> segment = map.segments[0];
Object keyOne = new Object();
int hashOne = map.hash(keyOne);
Object valueOne = new Object();
Object keyTwo = new Object();
Object valueTwo = new Object();
map.put(keyOne, valueOne);
@SuppressWarnings("unchecked")
WeakValueEntry<Object, Object, ?> entry =
(WeakValueEntry<Object, Object, ?>) segment.getEntry(keyOne, hashOne);
WeakValueReference<Object, Object, ?> valueReference = entry.getValueReference();
@SuppressWarnings("unchecked")
Reference<Object> reference = (Reference) valueReference;
reference.enqueue();
map.put(keyTwo, valueTwo);
assertFalse(map.containsKey(keyOne));
assertFalse(map.containsValue(valueOne));
assertNull(map.get(keyOne));
assertEquals(1, map.size());
assertNull(segment.getValueReferenceQueueForTesting().poll());
}
}
}
public void testDrainKeyReferenceQueueOnRead() {
for (MapMaker maker : allWeakKeyStrengthMakers()) {
MapMakerInternalMap<Object, Object, ?, ?> map = makeMap(maker.concurrencyLevel(1));
if (maker.getKeyStrength() == Strength.WEAK) {
Segment<Object, Object, ?, ?> segment = map.segments[0];
Object keyOne = new Object();
int hashOne = map.hash(keyOne);
Object valueOne = new Object();
Object keyTwo = new Object();
map.put(keyOne, valueOne);
InternalEntry<Object, Object, ?> entry = segment.getEntry(keyOne, hashOne);
@SuppressWarnings("unchecked")
Reference<Object> reference = (Reference) entry;
reference.enqueue();
for (int i = 0; i < SMALL_MAX_SIZE; i++) {
Object unused = map.get(keyTwo);
}
assertFalse(map.containsKey(keyOne));
assertFalse(map.containsValue(valueOne));
assertNull(map.get(keyOne));
assertEquals(0, map.size());
assertNull(segment.getKeyReferenceQueueForTesting().poll());
}
}
}
public void testDrainValueReferenceQueueOnRead() {
for (MapMaker maker : allWeakValueStrengthMakers()) {
MapMakerInternalMap<Object, Object, ?, ?> map = makeMap(maker.concurrencyLevel(1));
if (maker.getValueStrength() == Strength.WEAK) {
Segment<Object, Object, ?, ?> segment = map.segments[0];
Object keyOne = new Object();
int hashOne = map.hash(keyOne);
Object valueOne = new Object();
Object keyTwo = new Object();
map.put(keyOne, valueOne);
@SuppressWarnings("unchecked")
WeakValueEntry<Object, Object, ?> entry =
(WeakValueEntry<Object, Object, ?>) segment.getEntry(keyOne, hashOne);
WeakValueReference<Object, Object, ?> valueReference = entry.getValueReference();
@SuppressWarnings("unchecked")
Reference<Object> reference = (Reference) valueReference;
reference.enqueue();
for (int i = 0; i < SMALL_MAX_SIZE; i++) {
Object unused = map.get(keyTwo);
}
assertFalse(map.containsKey(keyOne));
assertFalse(map.containsValue(valueOne));
assertNull(map.get(keyOne));
assertEquals(0, map.size());
assertNull(segment.getValueReferenceQueueForTesting().poll());
}
}
}
// utility methods
private static Iterable<MapMaker> allWeakKeyStrengthMakers() {
return ImmutableList.of(
createMapMaker().weakKeys(),
createMapMaker().weakKeys().weakValues());
}
private static Iterable<MapMaker> allWeakValueStrengthMakers() {
return ImmutableList.of(
createMapMaker().weakValues(), createMapMaker().weakKeys().weakValues());
}
public void testNullParameters() throws Exception {
NullPointerTester tester = new NullPointerTester();
tester.testAllPublicInstanceMethods(makeMap(createMapMaker()));
}
}