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Java example source code file (MapMakerInternalMapTest.java)

This example Java source code file (MapMakerInternalMapTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

atomicreferencearray, dummyentry, dummyvaluereference, equivalence, mapmakerinternalmap, object, override, referenceentry, segment, small_max_size, strength, suppresswarnings

The MapMakerInternalMapTest.java Java example source code

/*
 * 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.collect.MapMakerInternalMap.unset;
import static com.google.common.truth.Truth.assertThat;

import com.google.common.base.Equivalence;
import com.google.common.collect.MapMakerInternalMap.EntryFactory;
import com.google.common.collect.MapMakerInternalMap.ReferenceEntry;
import com.google.common.collect.MapMakerInternalMap.Segment;
import com.google.common.collect.MapMakerInternalMap.Strength;
import com.google.common.collect.MapMakerInternalMap.ValueReference;
import com.google.common.testing.NullPointerTester;

import junit.framework.TestCase;

import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.util.concurrent.atomic.AtomicReferenceArray;

/**
 * @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 makeMap(MapMaker maker) {
    return new MapMakerInternalMap<K, V>(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);

    assertSame(EntryFactory.STRONG, map.entryFactory);

    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() {
      @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);
    assertSame(EntryFactory.WEAK, map.entryFactory);
  }

  public void testSetWeakValues() {
    MapMakerInternalMap<Object, Object> map = makeMap(createMapMaker().weakValues());
    checkStrength(map, Strength.STRONG, Strength.WEAK);
    assertSame(EntryFactory.STRONG, map.entryFactory);
  }

  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 : allKeyValueStrengthMakers()) {
      MapMakerInternalMap<Object, Object> map = makeMap(maker);

      Object keyOne = new Object();
      Object valueOne = new Object();
      int hashOne = map.hash(keyOne);
      ReferenceEntry<Object, Object> entryOne = map.newEntry(keyOne, hashOne, null);
      ValueReference<Object, Object> valueRefOne = map.newValueReference(entryOne, valueOne);
      assertSame(valueOne, valueRefOne.get());
      entryOne.setValueReference(valueRefOne);

      assertSame(keyOne, entryOne.getKey());
      assertEquals(hashOne, entryOne.getHash());
      assertNull(entryOne.getNext());
      assertSame(valueRefOne, entryOne.getValueReference());

      Object keyTwo = new Object();
      Object valueTwo = new Object();
      int hashTwo = map.hash(keyTwo);
      ReferenceEntry<Object, Object> entryTwo = map.newEntry(keyTwo, hashTwo, entryOne);
      ValueReference<Object, Object> valueRefTwo = map.newValueReference(entryTwo, valueTwo);
      assertSame(valueTwo, valueRefTwo.get());
      entryTwo.setValueReference(valueRefTwo);

      assertSame(keyTwo, entryTwo.getKey());
      assertEquals(hashTwo, entryTwo.getHash());
      assertSame(entryOne, entryTwo.getNext());
      assertSame(valueRefTwo, entryTwo.getValueReference());
    }
  }

  public void testCopyEntry() {
    for (MapMaker maker : allKeyValueStrengthMakers()) {
      MapMakerInternalMap<Object, Object> map = makeMap(maker);

      Object keyOne = new Object();
      Object valueOne = new Object();
      int hashOne = map.hash(keyOne);
      ReferenceEntry<Object, Object> entryOne = map.newEntry(keyOne, hashOne, null);
      entryOne.setValueReference(map.newValueReference(entryOne, valueOne));

      Object keyTwo = new Object();
      Object valueTwo = new Object();
      int hashTwo = map.hash(keyTwo);
      ReferenceEntry<Object, Object> entryTwo = map.newEntry(keyTwo, hashTwo, entryOne);
      entryTwo.setValueReference(map.newValueReference(entryTwo, valueTwo));

      ReferenceEntry<Object, Object> copyOne = map.copyEntry(entryOne, null);
      assertSame(keyOne, entryOne.getKey());
      assertEquals(hashOne, entryOne.getHash());
      assertNull(entryOne.getNext());
      assertSame(valueOne, copyOne.getValueReference().get());

      ReferenceEntry<Object, Object> copyTwo = map.copyEntry(entryTwo, copyOne);
      assertSame(keyTwo, copyTwo.getKey());
      assertEquals(hashTwo, copyTwo.getHash());
      assertSame(copyOne, copyTwo.getNext());
      assertSame(valueTwo, copyTwo.getValueReference().get());
    }
  }

  public void testSegmentGetAndContains() {
    MapMakerInternalMap<Object, Object> map = makeMap(createMapMaker().concurrencyLevel(1));
    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<ReferenceEntry table = segment.table;
    int index = hash & (table.length() - 1);

    ReferenceEntry<Object, Object> entry = map.newEntry(key, hash, null);
    ValueReference<Object, Object> valueRef = map.newValueReference(entry, value);
    entry.setValueReference(valueRef);

    assertNull(segment.get(key, hash));

    // count == 0
    table.set(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
    DummyEntry<Object, Object> nullEntry = DummyEntry.create(null, hash, entry);
    Object nullValue = new Object();
    ValueReference<Object, Object> nullValueRef = map.newValueReference(nullEntry, nullValue);
    nullEntry.setValueReference(nullValueRef);
    table.set(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
    DummyEntry<Object, Object> dummy = DummyEntry.create(new Object(), hash, entry);
    Object dummyValue = new Object();
    ValueReference<Object, Object> dummyValueRef = map.newValueReference(dummy, dummyValue);
    dummy.setValueReference(dummyValueRef);
    table.set(index, dummy);
    assertSame(value, segment.get(key, hash));
    assertTrue(segment.containsKey(key, hash));
    assertTrue(segment.containsValue(value));
    assertTrue(segment.containsValue(dummyValue));

    // key collision
    dummy = DummyEntry.create(key, hash, entry);
    dummyValue = new Object();
    dummyValueRef = map.newValueReference(dummy, dummyValue);
    dummy.setValueReference(dummyValueRef);
    table.set(index, dummy);
    // 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));
    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<ReferenceEntry table = segment.table;
    int index = hash & (table.length() - 1);

    DummyEntry<Object, Object> entry = DummyEntry.create(key, hash, null);
    DummyValueReference<Object, Object> oldValueRef = DummyValueReference.create(oldValue, entry);
    entry.setValueReference(oldValueRef);

    // no entry
    assertFalse(segment.replace(key, hash, oldValue, newValue));
    assertEquals(0, segment.count);

    // same value
    table.set(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
    entry.setValueReference(oldValueRef);
    assertSame(oldValue, segment.get(key, hash));
    oldValueRef.clear(null);
    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));
    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<ReferenceEntry table = segment.table;
    int index = hash & (table.length() - 1);

    DummyEntry<Object, Object> entry = DummyEntry.create(key, hash, null);
    DummyValueReference<Object, Object> oldValueRef = DummyValueReference.create(oldValue, entry);
    entry.setValueReference(oldValueRef);

    // no entry
    assertNull(segment.replace(key, hash, newValue));
    assertEquals(0, segment.count);

    // same key
    table.set(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
    entry.setValueReference(oldValueRef);
    assertSame(oldValue, segment.get(key, hash));
    oldValueRef.clear(null);
    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));
    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
    ReferenceEntry<Object, Object> entry = segment.getEntry(key, hash);
    DummyValueReference<Object, Object> oldValueRef = DummyValueReference.create(oldValue, entry);
    entry.setValueReference(oldValueRef);
    assertSame(oldValue, segment.get(key, hash));
    oldValueRef.clear(null);
    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));
    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
    ReferenceEntry<Object, Object> entry = segment.getEntry(key, hash);
    DummyValueReference<Object, Object> oldValueRef = DummyValueReference.create(oldValue, entry);
    entry.setValueReference(oldValueRef);
    assertSame(oldValue, segment.get(key, hash));
    oldValueRef.clear(null);
    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));
    Segment<Object, Object> segment = map.segments[0];

    Object key = new Object();
    int hash = map.hash(key);
    Object oldValue = new Object();
    AtomicReferenceArray<ReferenceEntry table = segment.table;
    int index = hash & (table.length() - 1);

    DummyEntry<Object, Object> entry = DummyEntry.create(key, hash, null);
    DummyValueReference<Object, Object> oldValueRef = DummyValueReference.create(oldValue, entry);
    entry.setValueReference(oldValueRef);

    // no entry
    assertEquals(0, segment.count);
    assertNull(segment.remove(key, hash));
    assertEquals(0, segment.count);

    // same key
    table.set(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
    table.set(index, entry);
    segment.count++;
    assertEquals(1, segment.count);
    assertSame(oldValue, segment.get(key, hash));
    oldValueRef.clear(null);
    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));
    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<ReferenceEntry table = segment.table;
    int index = hash & (table.length() - 1);

    DummyEntry<Object, Object> entry = DummyEntry.create(key, hash, null);
    DummyValueReference<Object, Object> oldValueRef = DummyValueReference.create(oldValue, entry);
    entry.setValueReference(oldValueRef);

    // no entry
    assertEquals(0, segment.count);
    assertNull(segment.remove(key, hash));
    assertEquals(0, segment.count);

    // same value
    table.set(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
    table.set(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(null);
    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;
    ReferenceEntry<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 = map.newEntry(key, hash, entry);
      ValueReference<Object, Object> valueRef = map.newValueReference(entry, value);
      entry.setValueReference(valueRef);
    }
    segment.table.set(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);
    DummyEntry<Object, Object> entryOne = createDummyEntry(keyOne, hashOne, valueOne, null);
    Object keyTwo = new Object();
    Object valueTwo = new Object();
    int hashTwo = map.hash(keyTwo);
    DummyEntry<Object, Object> entryTwo = createDummyEntry(keyTwo, hashTwo, valueTwo, entryOne);
    Object keyThree = new Object();
    Object valueThree = new Object();
    int hashThree = map.hash(keyThree);
    DummyEntry<Object, Object> entryThree =
        createDummyEntry(keyThree, hashThree, valueThree, entryTwo);

    // alone
    assertNull(segment.removeFromChain(entryOne, entryOne));

    // head
    assertSame(entryOne, segment.removeFromChain(entryTwo, entryTwo));

    // middle
    ReferenceEntry<Object, Object> newFirst = segment.removeFromChain(entryThree, entryTwo);
    assertSame(keyThree, newFirst.getKey());
    assertSame(valueThree, newFirst.getValueReference().get());
    assertEquals(hashThree, newFirst.getHash());
    assertSame(entryOne, newFirst.getNext());

    // tail (remaining entries are copied in reverse order)
    newFirst = segment.removeFromChain(entryThree, entryOne);
    assertSame(keyTwo, newFirst.getKey());
    assertSame(valueTwo, newFirst.getValueReference().get());
    assertEquals(hashTwo, newFirst.getHash());
    newFirst = newFirst.getNext();
    assertSame(keyThree, newFirst.getKey());
    assertSame(valueThree, newFirst.getValueReference().get());
    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;
    ReferenceEntry<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 = DummyEntry.create(key, hash, entry);
      ValueReference<Object, Object> valueRef = DummyValueReference.create(value, entry);
      entry.setValueReference(valueRef);
    }
    segment.table.set(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 map) {
    int result = 0;
    for (Segment<K, V> segment : map.segments) {
      AtomicReferenceArray<ReferenceEntry table = segment.table;
      for (int i = 0; i < table.length(); i++) {
        for (ReferenceEntry<K, V> e = table.get(i); e != null; e = e.getNext()) {
          if (map.isLive(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<ReferenceEntry table = segment.table;
    assertEquals(1, table.length());

    Object key = new Object();
    Object value = new Object();
    int hash = map.hash(key);
    DummyEntry<Object, Object> entry = createDummyEntry(key, hash, value, null);

    segment.table.set(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<ReferenceEntry table = segment.table;
    assertEquals(1, table.length());

    Object key = new Object();
    Object value = new Object();
    int hash = map.hash(key);
    DummyEntry<Object, Object> entry = createDummyEntry(key, hash, value, null);

    // remove absent
    assertFalse(segment.removeEntry(entry, hash));

    table.set(0, entry);
    segment.count = 1;
    assertTrue(segment.removeEntry(entry, hash));
    assertEquals(0, segment.count);
    assertNull(table.get(0));
  }

  public void testClearValue() {
    MapMakerInternalMap<Object, Object> map =
        makeMap(createMapMaker().concurrencyLevel(1).initialCapacity(1));
    Segment<Object, Object> segment = map.segments[0];
    AtomicReferenceArray<ReferenceEntry table = segment.table;
    assertEquals(1, table.length());

    Object key = new Object();
    Object value = new Object();
    int hash = map.hash(key);
    DummyEntry<Object, Object> entry = DummyEntry.create(key, hash, null);
    DummyValueReference<Object, Object> valueRef = DummyValueReference.create(value, entry);
    entry.setValueReference(valueRef);

    // clear absent
    assertFalse(segment.clearValue(key, hash, valueRef));

    table.set(0, entry);
    // don't increment count; this is used during computation
    assertTrue(segment.clearValue(key, hash, valueRef));
    // no notification sent with clearValue
    assertEquals(0, segment.count);
    assertNull(table.get(0));

    // clear wrong value reference
    table.set(0, entry);
    DummyValueReference<Object, Object> otherValueRef = DummyValueReference.create(value, entry);
    entry.setValueReference(otherValueRef);
    assertFalse(segment.clearValue(key, hash, valueRef));
    entry.setValueReference(valueRef);
    assertTrue(segment.clearValue(key, hash, valueRef));
  }

  // reference queues

  public void testDrainKeyReferenceQueueOnWrite() {
    for (MapMaker maker : allKeyValueStrengthMakers()) {
      MapMakerInternalMap<Object, Object> map =
          makeMap(maker.concurrencyLevel(1));
      if (map.usesKeyReferences()) {
        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);
        ReferenceEntry<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.keyReferenceQueue.poll());
      }
    }
  }

  public void testDrainValueReferenceQueueOnWrite() {
    for (MapMaker maker : allKeyValueStrengthMakers()) {
      MapMakerInternalMap<Object, Object> map =
          makeMap(maker.concurrencyLevel(1));
      if (map.usesValueReferences()) {
        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);
        ReferenceEntry<Object, Object> entry = segment.getEntry(keyOne, hashOne);
        ValueReference<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.valueReferenceQueue.poll());
      }
    }
  }

  public void testDrainKeyReferenceQueueOnRead() {
    for (MapMaker maker : allKeyValueStrengthMakers()) {
      MapMakerInternalMap<Object, Object> map =
          makeMap(maker.concurrencyLevel(1));
      if (map.usesKeyReferences()) {
        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);
        ReferenceEntry<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.keyReferenceQueue.poll());
      }
    }
  }

  public void testDrainValueReferenceQueueOnRead() {
    for (MapMaker maker : allKeyValueStrengthMakers()) {
      MapMakerInternalMap<Object, Object> map =
          makeMap(maker.concurrencyLevel(1));
      if (map.usesValueReferences()) {
        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);
        ReferenceEntry<Object, Object> entry = segment.getEntry(keyOne, hashOne);
        ValueReference<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.valueReferenceQueue.poll());
      }
    }
  }

  // utility methods

  /**
   * Returns an iterable containing all combinations weakKeys and weakValues.
   */
  private static Iterable<MapMaker> allKeyValueStrengthMakers() {
    return ImmutableList.of(
        createMapMaker(),
        createMapMaker().weakValues(),
        createMapMaker().weakKeys(),
        createMapMaker().weakKeys().weakValues());
  }

  // entries and values

  private static <K, V> DummyEntry createDummyEntry(
      K key, int hash, V value, ReferenceEntry<K, V> next) {
    DummyEntry<K, V> entry = DummyEntry.create(key, hash, next);
    DummyValueReference<K, V> valueRef = DummyValueReference.create(value, entry);
    entry.setValueReference(valueRef);
    return entry;
  }

  static class DummyEntry<K, V> implements ReferenceEntry {
    private K key;
    private final int hash;
    private final ReferenceEntry<K, V> next;

    public DummyEntry(K key, int hash, ReferenceEntry<K, V> next) {
      this.key = key;
      this.hash = hash;
      this.next = next;
    }

    public static <K, V> DummyEntry create(K key, int hash, ReferenceEntry next) {
      return new DummyEntry<K, V>(key, hash, next);
    }

    public void clearKey() {
      this.key = null;
    }

    private ValueReference<K, V> valueReference = unset();

    @Override
    public ValueReference<K, V> getValueReference() {
      return valueReference;
    }

    @Override
    public void setValueReference(ValueReference<K, V> valueReference) {
      this.valueReference = valueReference;
    }

    @Override
    public ReferenceEntry<K, V> getNext() {
      return next;
    }

    @Override
    public int getHash() {
      return hash;
    }

    @Override
    public K getKey() {
      return key;
    }
  }

  static class DummyValueReference<K, V> implements ValueReference {
    final ReferenceEntry<K, V> entry;
    private V value;

    public DummyValueReference(V value, ReferenceEntry<K, V> entry) {
      this.value = value;
      this.entry = entry;
    }

    public static <K, V> DummyValueReference create(V value, ReferenceEntry entry) {
      return new DummyValueReference<K, V>(value, entry);
    }

    @Override
    public V get() {
      return value;
    }

    @Override
    public ReferenceEntry<K, V> getEntry() {
      return entry;
    }

    @Override
    public ValueReference<K, V> copyFor(
        ReferenceQueue<V> queue, V value, ReferenceEntry entry) {
      return new DummyValueReference<K, V>(value, entry);
    }

    boolean computing = false;

    public void setComputing(boolean computing) {
      this.computing = computing;
    }

    @Override
    public boolean isComputingReference() {
      return computing;
    }

    @Override
    public V waitForValue() {
      return get();
    }

    @Override
    public void clear(ValueReference<K, V> newValue) {
      value = null;
    }
  }

  public void testNullParameters() throws Exception {
    NullPointerTester tester = new NullPointerTester();
    tester.testAllPublicInstanceMethods(makeMap(createMapMaker()));
  }
}




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