Java InternalEntry类代码示例

import com.google.common.collect.MapMakerInternalMap.InternalEntry; //导入依赖的package包/类
@Override
public E intern(E sample) {
  while (true) {
    // trying to read the canonical...
    InternalEntry<E, Dummy, ?> entry = map.getEntry(sample);
    if (entry != null) {
      E canonical = entry.getKey();
      if (canonical != null) { // only matters if weak/soft keys are used
        return canonical;
      }
    }

    // didn't see it, trying to put it instead...
    Dummy sneaky = map.putIfAbsent(sample, Dummy.VALUE);
    if (sneaky == null) {
      return sample;
    } else {
      /* Someone beat us to it! Trying again...
       *
       * Technically this loop not guaranteed to terminate, so theoretically (extremely
       * unlikely) this thread might starve, but even then, there is always going to be another
       * thread doing progress here.
       */
    }
  }
}
 

import com.google.common.collect.MapMakerInternalMap.InternalEntry; //导入依赖的package包/类
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);
}
 

import com.google.common.collect.MapMakerInternalMap.InternalEntry; //导入依赖的package包/类
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));
}
 

import com.google.common.collect.MapMakerInternalMap.InternalEntry; //导入依赖的package包/类
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));
  }
}
 

import com.google.common.collect.MapMakerInternalMap.InternalEntry; //导入依赖的package包/类
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());
  }
}
 

import com.google.common.collect.MapMakerInternalMap.InternalEntry; //导入依赖的package包/类
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));
}
 

import com.google.common.collect.MapMakerInternalMap.InternalEntry; //导入依赖的package包/类
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));
}
 

import com.google.common.collect.MapMakerInternalMap.InternalEntry; //导入依赖的package包/类
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));
}
 

import com.google.common.collect.MapMakerInternalMap.InternalEntry; //导入依赖的package包/类
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));
}
 

import com.google.common.collect.MapMakerInternalMap.InternalEntry; //导入依赖的package包/类
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);
  }
}
 

import com.google.common.collect.MapMakerInternalMap.InternalEntry; //导入依赖的package包/类
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;
}
 

import com.google.common.collect.MapMakerInternalMap.InternalEntry; //导入依赖的package包/类
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));
}
 

import com.google.common.collect.MapMakerInternalMap.InternalEntry; //导入依赖的package包/类
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());
    }
  }
}
 

import com.google.common.collect.MapMakerInternalMap.InternalEntry; //导入依赖的package包/类
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());
    }
  }
}