13 |
|
import java.util.AbstractMap; |
14 |
|
import java.util.Arrays; |
15 |
|
import java.util.Collection; |
16 |
– |
import java.util.Comparator; |
16 |
|
import java.util.Enumeration; |
17 |
|
import java.util.HashMap; |
18 |
|
import java.util.Hashtable; |
21 |
|
import java.util.NoSuchElementException; |
22 |
|
import java.util.Set; |
23 |
|
import java.util.Spliterator; |
25 |
– |
import java.util.concurrent.ConcurrentMap; |
26 |
– |
import java.util.concurrent.ForkJoinPool; |
24 |
|
import java.util.concurrent.atomic.AtomicReference; |
25 |
|
import java.util.concurrent.locks.LockSupport; |
26 |
|
import java.util.concurrent.locks.ReentrantLock; |
27 |
|
import java.util.function.BiConsumer; |
28 |
|
import java.util.function.BiFunction; |
32 |
– |
import java.util.function.BinaryOperator; |
29 |
|
import java.util.function.Consumer; |
30 |
|
import java.util.function.DoubleBinaryOperator; |
31 |
|
import java.util.function.Function; |
32 |
|
import java.util.function.IntBinaryOperator; |
33 |
|
import java.util.function.LongBinaryOperator; |
34 |
+ |
import java.util.function.Predicate; |
35 |
|
import java.util.function.ToDoubleBiFunction; |
36 |
|
import java.util.function.ToDoubleFunction; |
37 |
|
import java.util.function.ToIntBiFunction; |
121 |
|
* being concurrently updated by other threads; for example, when |
122 |
|
* computing a snapshot summary of the values in a shared registry. |
123 |
|
* There are three kinds of operation, each with four forms, accepting |
124 |
< |
* functions with Keys, Values, Entries, and (Key, Value) arguments |
125 |
< |
* and/or return values. Because the elements of a ConcurrentHashMap |
126 |
< |
* are not ordered in any particular way, and may be processed in |
127 |
< |
* different orders in different parallel executions, the correctness |
128 |
< |
* of supplied functions should not depend on any ordering, or on any |
129 |
< |
* other objects or values that may transiently change while |
130 |
< |
* computation is in progress; and except for forEach actions, should |
131 |
< |
* ideally be side-effect-free. Bulk operations on {@link java.util.Map.Entry} |
132 |
< |
* objects do not support method {@code setValue}. |
124 |
> |
* functions with keys, values, entries, and (key, value) pairs as |
125 |
> |
* arguments and/or return values. Because the elements of a |
126 |
> |
* ConcurrentHashMap are not ordered in any particular way, and may be |
127 |
> |
* processed in different orders in different parallel executions, the |
128 |
> |
* correctness of supplied functions should not depend on any |
129 |
> |
* ordering, or on any other objects or values that may transiently |
130 |
> |
* change while computation is in progress; and except for forEach |
131 |
> |
* actions, should ideally be side-effect-free. Bulk operations on |
132 |
> |
* {@link java.util.Map.Entry} objects do not support method {@code |
133 |
> |
* setValue}. |
134 |
|
* |
135 |
|
* <ul> |
136 |
|
* <li> forEach: Perform a given action on each element. |
449 |
|
* |
450 |
|
* Maintaining API and serialization compatibility with previous |
451 |
|
* versions of this class introduces several oddities. Mainly: We |
452 |
< |
* leave untouched but unused constructor arguments refering to |
452 |
> |
* leave untouched but unused constructor arguments referring to |
453 |
|
* concurrencyLevel. We accept a loadFactor constructor argument, |
454 |
|
* but apply it only to initial table capacity (which is the only |
455 |
|
* time that we can guarantee to honor it.) We also declare an |
598 |
|
this.next = next; |
599 |
|
} |
600 |
|
|
601 |
< |
public final K getKey() { return key; } |
602 |
< |
public final V getValue() { return val; } |
603 |
< |
public final int hashCode() { return key.hashCode() ^ val.hashCode(); } |
604 |
< |
public final String toString(){ return key + "=" + val; } |
601 |
> |
public final K getKey() { return key; } |
602 |
> |
public final V getValue() { return val; } |
603 |
> |
public final int hashCode() { return key.hashCode() ^ val.hashCode(); } |
604 |
> |
public final String toString() { |
605 |
> |
return Helpers.mapEntryToString(key, val); |
606 |
> |
} |
607 |
|
public final V setValue(V value) { |
608 |
|
throw new UnsupportedOperationException(); |
609 |
|
} |
1027 |
|
p.val = value; |
1028 |
|
} |
1029 |
|
} |
1030 |
+ |
else if (f instanceof ReservationNode) |
1031 |
+ |
throw new IllegalStateException("Recursive update"); |
1032 |
|
} |
1033 |
|
} |
1034 |
|
if (binCount != 0) { |
1131 |
|
} |
1132 |
|
} |
1133 |
|
} |
1134 |
+ |
else if (f instanceof ReservationNode) |
1135 |
+ |
throw new IllegalStateException("Recursive update"); |
1136 |
|
} |
1137 |
|
} |
1138 |
|
if (validated) { |
1375 |
|
new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL]; |
1376 |
|
for (int i = 0; i < segments.length; ++i) |
1377 |
|
segments[i] = new Segment<K,V>(LOAD_FACTOR); |
1378 |
< |
s.putFields().put("segments", segments); |
1379 |
< |
s.putFields().put("segmentShift", segmentShift); |
1380 |
< |
s.putFields().put("segmentMask", segmentMask); |
1378 |
> |
java.io.ObjectOutputStream.PutField streamFields = s.putFields(); |
1379 |
> |
streamFields.put("segments", segments); |
1380 |
> |
streamFields.put("segmentShift", segmentShift); |
1381 |
> |
streamFields.put("segmentMask", segmentMask); |
1382 |
|
s.writeFields(); |
1383 |
|
|
1384 |
|
Node<K,V>[] t; |
1595 |
|
} |
1596 |
|
|
1597 |
|
/** |
1598 |
+ |
* Helper method for EntrySetView.removeIf |
1599 |
+ |
*/ |
1600 |
+ |
boolean removeEntryIf(Predicate<? super Entry<K,V>> function) { |
1601 |
+ |
if (function == null) throw new NullPointerException(); |
1602 |
+ |
Node<K,V>[] t; |
1603 |
+ |
boolean removed = false; |
1604 |
+ |
if ((t = table) != null) { |
1605 |
+ |
Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length); |
1606 |
+ |
for (Node<K,V> p; (p = it.advance()) != null; ) { |
1607 |
+ |
K k = p.key; |
1608 |
+ |
V v = p.val; |
1609 |
+ |
Map.Entry<K,V> e = new AbstractMap.SimpleImmutableEntry<>(k, v); |
1610 |
+ |
if (function.test(e) && replaceNode(k, null, v) != null) |
1611 |
+ |
removed = true; |
1612 |
+ |
} |
1613 |
+ |
} |
1614 |
+ |
return removed; |
1615 |
+ |
} |
1616 |
+ |
|
1617 |
+ |
/** |
1618 |
+ |
* Helper method for ValuesView.removeIf |
1619 |
+ |
*/ |
1620 |
+ |
boolean removeValueIf(Predicate<? super V> function) { |
1621 |
+ |
if (function == null) throw new NullPointerException(); |
1622 |
+ |
Node<K,V>[] t; |
1623 |
+ |
boolean removed = false; |
1624 |
+ |
if ((t = table) != null) { |
1625 |
+ |
Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length); |
1626 |
+ |
for (Node<K,V> p; (p = it.advance()) != null; ) { |
1627 |
+ |
K k = p.key; |
1628 |
+ |
V v = p.val; |
1629 |
+ |
if (function.test(v) && replaceNode(k, null, v) != null) |
1630 |
+ |
removed = true; |
1631 |
+ |
} |
1632 |
+ |
} |
1633 |
+ |
return removed; |
1634 |
+ |
} |
1635 |
+ |
|
1636 |
+ |
/** |
1637 |
|
* If the specified key is not already associated with a value, |
1638 |
|
* attempts to compute its value using the given mapping function |
1639 |
|
* and enters it into this map unless {@code null}. The entire |
1691 |
|
if (fh >= 0) { |
1692 |
|
binCount = 1; |
1693 |
|
for (Node<K,V> e = f;; ++binCount) { |
1694 |
< |
K ek; V ev; |
1694 |
> |
K ek; |
1695 |
|
if (e.hash == h && |
1696 |
|
((ek = e.key) == key || |
1697 |
|
(ek != null && key.equals(ek)))) { |
1701 |
|
Node<K,V> pred = e; |
1702 |
|
if ((e = e.next) == null) { |
1703 |
|
if ((val = mappingFunction.apply(key)) != null) { |
1704 |
+ |
if (pred.next != null) |
1705 |
+ |
throw new IllegalStateException("Recursive update"); |
1706 |
|
added = true; |
1707 |
|
pred.next = new Node<K,V>(h, key, val, null); |
1708 |
|
} |
1722 |
|
t.putTreeVal(h, key, val); |
1723 |
|
} |
1724 |
|
} |
1725 |
+ |
else if (f instanceof ReservationNode) |
1726 |
+ |
throw new IllegalStateException("Recursive update"); |
1727 |
|
} |
1728 |
|
} |
1729 |
|
if (binCount != 0) { |
1819 |
|
} |
1820 |
|
} |
1821 |
|
} |
1822 |
+ |
else if (f instanceof ReservationNode) |
1823 |
+ |
throw new IllegalStateException("Recursive update"); |
1824 |
|
} |
1825 |
|
} |
1826 |
|
if (binCount != 0) |
1912 |
|
if ((e = e.next) == null) { |
1913 |
|
val = remappingFunction.apply(key, null); |
1914 |
|
if (val != null) { |
1915 |
+ |
if (pred.next != null) |
1916 |
+ |
throw new IllegalStateException("Recursive update"); |
1917 |
|
delta = 1; |
1918 |
|
pred.next = |
1919 |
|
new Node<K,V>(h, key, val, null); |
1946 |
|
setTabAt(tab, i, untreeify(t.first)); |
1947 |
|
} |
1948 |
|
} |
1949 |
+ |
else if (f instanceof ReservationNode) |
1950 |
+ |
throw new IllegalStateException("Recursive update"); |
1951 |
|
} |
1952 |
|
} |
1953 |
|
if (binCount != 0) { |
2057 |
|
setTabAt(tab, i, untreeify(t.first)); |
2058 |
|
} |
2059 |
|
} |
2060 |
+ |
else if (f instanceof ReservationNode) |
2061 |
+ |
throw new IllegalStateException("Recursive update"); |
2062 |
|
} |
2063 |
|
} |
2064 |
|
if (binCount != 0) { |
2076 |
|
// Hashtable legacy methods |
2077 |
|
|
2078 |
|
/** |
2079 |
< |
* Legacy method testing if some key maps into the specified value |
2024 |
< |
* in this table. |
2079 |
> |
* Tests if some key maps into the specified value in this table. |
2080 |
|
* |
2081 |
< |
* @deprecated This method is identical in functionality to |
2081 |
> |
* <p>Note that this method is identical in functionality to |
2082 |
|
* {@link #containsValue(Object)}, and exists solely to ensure |
2083 |
|
* full compatibility with class {@link java.util.Hashtable}, |
2084 |
< |
* which supported this method prior to introduction of the |
2085 |
< |
* Java Collections framework. |
2084 |
> |
* which supported this method prior to introduction of the Java |
2085 |
> |
* Collections Framework. |
2086 |
|
* |
2087 |
|
* @param value a value to search for |
2088 |
|
* @return {@code true} if and only if some key maps to the |
2091 |
|
* {@code false} otherwise |
2092 |
|
* @throws NullPointerException if the specified value is null |
2093 |
|
*/ |
2039 |
– |
@Deprecated |
2094 |
|
public boolean contains(Object value) { |
2095 |
|
return containsValue(value); |
2096 |
|
} |
2372 |
|
break; |
2373 |
|
else if (tab == table) { |
2374 |
|
int rs = resizeStamp(n); |
2375 |
< |
if (sc < 0) { |
2376 |
< |
Node<K,V>[] nt; |
2323 |
< |
if ((sc >>> RESIZE_STAMP_SHIFT) != rs || sc == rs + 1 || |
2324 |
< |
sc == rs + MAX_RESIZERS || (nt = nextTable) == null || |
2325 |
< |
transferIndex <= 0) |
2326 |
< |
break; |
2327 |
< |
if (U.compareAndSwapInt(this, SIZECTL, sc, sc + 1)) |
2328 |
< |
transfer(tab, nt); |
2329 |
< |
} |
2330 |
< |
else if (U.compareAndSwapInt(this, SIZECTL, sc, |
2331 |
< |
(rs << RESIZE_STAMP_SHIFT) + 2)) |
2375 |
> |
if (U.compareAndSwapInt(this, SIZECTL, sc, |
2376 |
> |
(rs << RESIZE_STAMP_SHIFT) + 2)) |
2377 |
|
transfer(tab, null); |
2378 |
|
} |
2379 |
|
} |
2628 |
|
* too small, in which case resizes instead. |
2629 |
|
*/ |
2630 |
|
private final void treeifyBin(Node<K,V>[] tab, int index) { |
2631 |
< |
Node<K,V> b; int n, sc; |
2631 |
> |
Node<K,V> b; int n; |
2632 |
|
if (tab != null) { |
2633 |
|
if ((n = tab.length) < MIN_TREEIFY_CAPACITY) |
2634 |
|
tryPresize(n << 1); |
2791 |
|
(kc = comparableClassFor(k)) == null) || |
2792 |
|
(dir = compareComparables(kc, k, pk)) == 0) |
2793 |
|
dir = tieBreakOrder(k, pk); |
2794 |
< |
TreeNode<K,V> xp = p; |
2794 |
> |
TreeNode<K,V> xp = p; |
2795 |
|
if ((p = (dir <= 0) ? p.left : p.right) == null) { |
2796 |
|
x.parent = xp; |
2797 |
|
if (dir <= 0) |
3259 |
|
return true; |
3260 |
|
} |
3261 |
|
|
3262 |
< |
private static final sun.misc.Unsafe U; |
3262 |
> |
private static final sun.misc.Unsafe U = sun.misc.Unsafe.getUnsafe(); |
3263 |
|
private static final long LOCKSTATE; |
3264 |
|
static { |
3265 |
|
try { |
3221 |
– |
U = sun.misc.Unsafe.getUnsafe(); |
3222 |
– |
Class<?> k = TreeBin.class; |
3266 |
|
LOCKSTATE = U.objectFieldOffset |
3267 |
< |
(k.getDeclaredField("lockState")); |
3268 |
< |
} catch (Exception e) { |
3267 |
> |
(TreeBin.class.getDeclaredField("lockState")); |
3268 |
> |
} catch (ReflectiveOperationException e) { |
3269 |
|
throw new Error(e); |
3270 |
|
} |
3271 |
|
} |
3494 |
|
public K getKey() { return key; } |
3495 |
|
public V getValue() { return val; } |
3496 |
|
public int hashCode() { return key.hashCode() ^ val.hashCode(); } |
3497 |
< |
public String toString() { return key + "=" + val; } |
3497 |
> |
public String toString() { |
3498 |
> |
return Helpers.mapEntryToString(key, val); |
3499 |
> |
} |
3500 |
|
|
3501 |
|
public boolean equals(Object o) { |
3502 |
|
Object k, v; Map.Entry<?,?> e; |
4709 |
|
throw new UnsupportedOperationException(); |
4710 |
|
} |
4711 |
|
|
4712 |
+ |
public boolean removeIf(Predicate<? super V> filter) { |
4713 |
+ |
return map.removeValueIf(filter); |
4714 |
+ |
} |
4715 |
+ |
|
4716 |
|
public Spliterator<V> spliterator() { |
4717 |
|
Node<K,V>[] t; |
4718 |
|
ConcurrentHashMap<K,V> m = map; |
4782 |
|
return added; |
4783 |
|
} |
4784 |
|
|
4785 |
+ |
public boolean removeIf(Predicate<? super Entry<K,V>> filter) { |
4786 |
+ |
return map.removeEntryIf(filter); |
4787 |
+ |
} |
4788 |
+ |
|
4789 |
|
public final int hashCode() { |
4790 |
|
int h = 0; |
4791 |
|
Node<K,V>[] t; |
6302 |
|
} |
6303 |
|
|
6304 |
|
// Unsafe mechanics |
6305 |
< |
private static final sun.misc.Unsafe U; |
6305 |
> |
private static final sun.misc.Unsafe U = sun.misc.Unsafe.getUnsafe(); |
6306 |
|
private static final long SIZECTL; |
6307 |
|
private static final long TRANSFERINDEX; |
6308 |
|
private static final long BASECOUNT; |
6309 |
|
private static final long CELLSBUSY; |
6310 |
|
private static final long CELLVALUE; |
6311 |
< |
private static final long ABASE; |
6311 |
> |
private static final int ABASE; |
6312 |
|
private static final int ASHIFT; |
6313 |
|
|
6314 |
|
static { |
6315 |
|
try { |
6263 |
– |
U = sun.misc.Unsafe.getUnsafe(); |
6264 |
– |
Class<?> k = ConcurrentHashMap.class; |
6316 |
|
SIZECTL = U.objectFieldOffset |
6317 |
< |
(k.getDeclaredField("sizeCtl")); |
6317 |
> |
(ConcurrentHashMap.class.getDeclaredField("sizeCtl")); |
6318 |
|
TRANSFERINDEX = U.objectFieldOffset |
6319 |
< |
(k.getDeclaredField("transferIndex")); |
6319 |
> |
(ConcurrentHashMap.class.getDeclaredField("transferIndex")); |
6320 |
|
BASECOUNT = U.objectFieldOffset |
6321 |
< |
(k.getDeclaredField("baseCount")); |
6321 |
> |
(ConcurrentHashMap.class.getDeclaredField("baseCount")); |
6322 |
|
CELLSBUSY = U.objectFieldOffset |
6323 |
< |
(k.getDeclaredField("cellsBusy")); |
6324 |
< |
Class<?> ck = CounterCell.class; |
6323 |
> |
(ConcurrentHashMap.class.getDeclaredField("cellsBusy")); |
6324 |
> |
|
6325 |
|
CELLVALUE = U.objectFieldOffset |
6326 |
< |
(ck.getDeclaredField("value")); |
6327 |
< |
Class<?> ak = Node[].class; |
6328 |
< |
ABASE = U.arrayBaseOffset(ak); |
6329 |
< |
int scale = U.arrayIndexScale(ak); |
6326 |
> |
(CounterCell.class.getDeclaredField("value")); |
6327 |
> |
|
6328 |
> |
ABASE = U.arrayBaseOffset(Node[].class); |
6329 |
> |
int scale = U.arrayIndexScale(Node[].class); |
6330 |
|
if ((scale & (scale - 1)) != 0) |
6331 |
< |
throw new Error("data type scale not a power of two"); |
6331 |
> |
throw new Error("array index scale not a power of two"); |
6332 |
|
ASHIFT = 31 - Integer.numberOfLeadingZeros(scale); |
6333 |
< |
} catch (Exception e) { |
6333 |
> |
} catch (ReflectiveOperationException e) { |
6334 |
|
throw new Error(e); |
6335 |
|
} |
6336 |
+ |
|
6337 |
+ |
// Reduce the risk of rare disastrous classloading in first call to |
6338 |
+ |
// LockSupport.park: https://bugs.openjdk.java.net/browse/JDK-8074773 |
6339 |
+ |
Class<?> ensureLoaded = LockSupport.class; |
6340 |
|
} |
6341 |
|
} |