/*
* Copyright 2012 Goldman Sachs.
*
* 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.gs.collections.impl.map.mutable;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.AbstractCollection;
import java.util.AbstractSet;
import java.util.Collection;
import java.util.ConcurrentModificationException;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.concurrent.Executor;
import java.util.concurrent.FutureTask;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicIntegerArray;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import java.util.concurrent.atomic.AtomicReferenceArray;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import com.gs.collections.api.block.function.Function;
import com.gs.collections.api.block.function.Function0;
import com.gs.collections.api.block.function.Function2;
import com.gs.collections.api.block.function.Function3;
import com.gs.collections.api.block.procedure.Procedure;
import com.gs.collections.api.block.procedure.Procedure2;
import com.gs.collections.api.block.procedure.primitive.ObjectIntProcedure;
import com.gs.collections.api.map.ConcurrentMutableMap;
import com.gs.collections.api.map.ImmutableMap;
import com.gs.collections.api.map.MutableMap;
import com.gs.collections.api.tuple.Pair;
import com.gs.collections.impl.block.procedure.MapEntryToProcedure2;
import com.gs.collections.impl.factory.Maps;
import com.gs.collections.impl.list.mutable.FastList;
import com.gs.collections.impl.utility.Iterate;
import com.gs.collections.impl.utility.MapIterate;
import com.gs.collections.impl.utility.internal.IterableIterate;
@SuppressWarnings({ "rawtypes", "ObjectEquality" })
public final class ConcurrentHashMap<K, V>
extends AbstractMutableMap<K, V>
implements ConcurrentMutableMap<K, V>, Externalizable
{
private static final long serialVersionUID = 1L;
private static final Object RESIZE_SENTINEL = new Object();
private static final int DEFAULT_INITIAL_CAPACITY = 16;
/**
* The maximum capacity, used if a higher value is implicitly specified
* by either of the constructors with arguments.
* MUST be a power of two <= 1<<30.
*/
private static final int MAXIMUM_CAPACITY = 1 << 30;
private static final AtomicReferenceFieldUpdater<ConcurrentHashMap, AtomicReferenceArray> TABLE_UPDATER = AtomicReferenceFieldUpdater.newUpdater(ConcurrentHashMap.class, AtomicReferenceArray.class, "table");
private static final AtomicIntegerFieldUpdater<ConcurrentHashMap> SIZE_UPDATER = AtomicIntegerFieldUpdater.newUpdater(ConcurrentHashMap.class, "size");
private static final Object RESIZED = new Object();
private static final Object RESIZING = new Object();
private static final int PARTITIONED_SIZE_THRESHOLD = 4096; // chosen to keep size below 1% of the total size of the map
private static final int SIZE_BUCKETS = 7;
/**
* The table, resized as necessary. Length MUST Always be a power of two.
*/
private volatile AtomicReferenceArray table;
private AtomicIntegerArray partitionedSize;
@SuppressWarnings("UnusedDeclaration")
private volatile int size; // updated via atomic field updater
public ConcurrentHashMap()
{
this(DEFAULT_INITIAL_CAPACITY);
}
public ConcurrentHashMap(int initialCapacity)
{
if (initialCapacity < 0)
{
throw new IllegalArgumentException("Illegal Initial Capacity: " + initialCapacity);
}
if (initialCapacity > MAXIMUM_CAPACITY)
{
initialCapacity = MAXIMUM_CAPACITY;
}
int threshold = initialCapacity;
threshold += threshold >> 1; // threshold = length * 0.75
int capacity = 1;
while (capacity < threshold)
{
capacity <<= 1;
}
if (capacity >= PARTITIONED_SIZE_THRESHOLD)
{
this.partitionedSize = new AtomicIntegerArray(SIZE_BUCKETS * 16); // we want 7 extra slots and 64 bytes for each slot. int is 4 bytes, so 64 bytes is 16 ints.
}
this.table = new AtomicReferenceArray(capacity + 1);
}
public static <K, V> ConcurrentHashMap<K, V> newMap()
{
return new ConcurrentHashMap<K, V>();
}
public static <K, V> ConcurrentHashMap<K, V> newMap(int newSize)
{
return new ConcurrentHashMap<K, V>(newSize);
}
private static int indexFor(int h, int length)
{
return h & length - 2;
}
public V putIfAbsent(K key, V value)
{
int hash = this.hash(key);
AtomicReferenceArray currentArray = this.table;
while (true)
{
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == RESIZED || o == RESIZING)
{
currentArray = this.helpWithResizeWhileCurrentIndex(currentArray, index);
}
else
{
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
K candidate = e.getKey();
if (candidate.equals(key))
{
return e.getValue();
}
e = e.getNext();
}
Entry<K, V> newEntry = new Entry<K, V>(key, value, (Entry<K, V>) o);
if (currentArray.compareAndSet(index, o, newEntry))
{
this.incrementSizeAndPossiblyResize(currentArray, length, o);
return null; // per the contract of putIfAbsent, we return null when the map didn't have this key before
}
}
}
}
private void incrementSizeAndPossiblyResize(AtomicReferenceArray currentArray, int length, Object prev)
{
this.addToSize(1);
if (prev != null)
{
int localSize = this.size();
int threshold = (length >> 1) + (length >> 2); // threshold = length * 0.75
if (localSize + 1 > threshold)
{
this.resize(currentArray);
}
}
}
private int hash(Object key)
{
int h = key.hashCode();
h ^= h >>> 20 ^ h >>> 12;
h ^= h >>> 7 ^ h >>> 4;
return h;
}
private AtomicReferenceArray helpWithResizeWhileCurrentIndex(AtomicReferenceArray currentArray, int index)
{
AtomicReferenceArray newArray = this.helpWithResize(currentArray);
int helpCount = 0;
while (currentArray.get(index) != RESIZED)
{
helpCount++;
newArray = this.helpWithResize(currentArray);
if ((helpCount & 7) == 0)
{
Thread.yield();
}
}
return newArray;
}
private AtomicReferenceArray helpWithResize(AtomicReferenceArray currentArray)
{
ResizeContainer resizeContainer = (ResizeContainer) currentArray.get(currentArray.length() - 1);
AtomicReferenceArray newTable = resizeContainer.nextArray;
if (resizeContainer.getQueuePosition() > ResizeContainer.QUEUE_INCREMENT)
{
resizeContainer.incrementResizer();
this.reverseTransfer(currentArray, resizeContainer);
resizeContainer.decrementResizerAndNotify();
}
return newTable;
}
private void resize(AtomicReferenceArray oldTable)
{
this.resize(oldTable, (oldTable.length() - 1 << 1) + 1);
}
// newSize must be a power of 2 + 1
@SuppressWarnings("JLM_JSR166_UTILCONCURRENT_MONITORENTER")
private void resize(AtomicReferenceArray oldTable, int newSize)
{
int oldCapacity = oldTable.length();
int end = oldCapacity - 1;
Object last = oldTable.get(end);
if (this.size() < end && last == RESIZE_SENTINEL)
{
return;
}
if (oldCapacity >= MAXIMUM_CAPACITY)
{
throw new RuntimeException("index is too large!");
}
ResizeContainer resizeContainer = null;
boolean ownResize = false;
if (last == null || last == RESIZE_SENTINEL)
{
synchronized (oldTable) // allocating a new array is too expensive to make this an atomic operation
{
if (oldTable.get(end) == null)
{
oldTable.set(end, RESIZE_SENTINEL);
if (this.partitionedSize == null && newSize >= PARTITIONED_SIZE_THRESHOLD)
{
this.partitionedSize = new AtomicIntegerArray(SIZE_BUCKETS * 16);
}
resizeContainer = new ResizeContainer(new AtomicReferenceArray(newSize), oldTable.length() - 1);
oldTable.set(end, resizeContainer);
ownResize = true;
}
}
}
if (ownResize)
{
this.transfer(oldTable, resizeContainer);
AtomicReferenceArray src = this.table;
while (!TABLE_UPDATER.compareAndSet(this, oldTable, resizeContainer.nextArray))
{
// we're in a double resize situation; we'll have to go help until it's our turn to set the table
if (src != oldTable)
{
this.helpWithResize(src);
}
}
}
else
{
this.helpWithResize(oldTable);
}
}
/*
* Transfer all entries from src to dest tables
*/
private void transfer(AtomicReferenceArray src, ResizeContainer resizeContainer)
{
AtomicReferenceArray dest = resizeContainer.nextArray;
for (int j = 0; j < src.length() - 1; )
{
Object o = src.get(j);
if (o == null)
{
if (src.compareAndSet(j, null, RESIZED))
{
j++;
}
}
else if (o == RESIZED || o == RESIZING)
{
j = (j & ~(ResizeContainer.QUEUE_INCREMENT - 1)) + ResizeContainer.QUEUE_INCREMENT;
if (resizeContainer.resizers.get() == 1)
{
break;
}
}
else
{
Entry<K, V> e = (Entry<K, V>) o;
if (src.compareAndSet(j, o, RESIZING))
{
while (e != null)
{
this.unconditionalCopy(dest, e);
e = e.getNext();
}
src.set(j, RESIZED);
j++;
}
}
}
resizeContainer.decrementResizerAndNotify();
resizeContainer.waitForAllResizers();
}
private void reverseTransfer(AtomicReferenceArray src, ResizeContainer resizeContainer)
{
AtomicReferenceArray dest = resizeContainer.nextArray;
while (resizeContainer.getQueuePosition() > 0)
{
int start = resizeContainer.subtractAndGetQueuePosition();
int end = start + ResizeContainer.QUEUE_INCREMENT;
if (end > 0)
{
if (start < 0)
{
start = 0;
}
for (int j = end - 1; j >= start; )
{
Object o = src.get(j);
if (o == null)
{
if (src.compareAndSet(j, null, RESIZED))
{
j--;
}
}
else if (o == RESIZED || o == RESIZING)
{
resizeContainer.zeroOutQueuePosition();
return;
}
else
{
Entry<K, V> e = (Entry<K, V>) o;
if (src.compareAndSet(j, o, RESIZING))
{
while (e != null)
{
this.unconditionalCopy(dest, e);
e = e.getNext();
}
src.set(j, RESIZED);
j--;
}
}
}
}
}
}
private void unconditionalCopy(AtomicReferenceArray dest, Entry<K, V> toCopyEntry)
{
int hash = this.hash(toCopyEntry.getKey());
AtomicReferenceArray currentArray = dest;
while (true)
{
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == RESIZED || o == RESIZING)
{
currentArray = ((ResizeContainer) currentArray.get(length - 1)).nextArray;
}
else
{
Entry<K, V> newEntry;
if (o == null)
{
if (toCopyEntry.getNext() == null)
{
newEntry = toCopyEntry; // no need to duplicate
}
else
{
newEntry = new Entry<K, V>(toCopyEntry.getKey(), toCopyEntry.getValue());
}
}
else
{
newEntry = new Entry<K, V>(toCopyEntry.getKey(), toCopyEntry.getValue(), (Entry<K, V>) o);
}
if (currentArray.compareAndSet(index, o, newEntry))
{
return;
}
}
}
}
public V getIfAbsentPut(K key, Function<? super K, ? extends V> factory)
{
return this.getIfAbsentPutWith(key, factory, key);
}
@Override
public V getIfAbsentPut(K key, Function0<? extends V> factory)
{
int hash = this.hash(key);
AtomicReferenceArray currentArray = this.table;
V newValue = null;
boolean createdValue = false;
while (true)
{
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == RESIZED || o == RESIZING)
{
currentArray = this.helpWithResizeWhileCurrentIndex(currentArray, index);
}
else
{
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object candidate = e.getKey();
if (candidate.equals(key))
{
return e.getValue();
}
e = e.getNext();
}
if (!createdValue)
{
createdValue = true;
newValue = factory.value();
}
Entry<K, V> newEntry = new Entry<K, V>(key, newValue, (Entry<K, V>) o);
if (currentArray.compareAndSet(index, o, newEntry))
{
this.incrementSizeAndPossiblyResize(currentArray, length, o);
return newValue;
}
}
}
}
@Override
public V getIfAbsentPut(K key, V value)
{
int hash = this.hash(key);
AtomicReferenceArray currentArray = this.table;
while (true)
{
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == RESIZED || o == RESIZING)
{
currentArray = this.helpWithResizeWhileCurrentIndex(currentArray, index);
}
else
{
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object candidate = e.getKey();
if (candidate.equals(key))
{
return e.getValue();
}
e = e.getNext();
}
Entry<K, V> newEntry = new Entry<K, V>(key, value, (Entry<K, V>) o);
if (currentArray.compareAndSet(index, o, newEntry))
{
this.incrementSizeAndPossiblyResize(currentArray, length, o);
return value;
}
}
}
}
/**
* It puts an object into the map based on the key. It uses a copy of the key converted by transformer.
*
* @param key The "mutable" key, which has the same identity/hashcode as the inserted key, only during this call
* @param keyTransformer If the record is absent, the transformer will transform the "mutable" key into an immutable copy of the key.
* Note that the transformed key must have the same identity/hashcode as the original "mutable" key.
* @param factory It creates an object, if it is not present in the map already.
*/
public <P1, P2> V putIfAbsentGetIfPresent(K key, Function2<K, V, K> keyTransformer, Function3<P1, P2, K, V> factory, P1 param1, P2 param2)
{
int hash = this.hash(key);
AtomicReferenceArray currentArray = this.table;
V newValue = null;
boolean createdValue = false;
while (true)
{
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == RESIZED || o == RESIZING)
{
currentArray = this.helpWithResizeWhileCurrentIndex(currentArray, index);
}
else
{
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object candidate = e.getKey();
if (candidate.equals(key))
{
return e.getValue();
}
e = e.getNext();
}
if (!createdValue)
{
createdValue = true;
newValue = factory.value(param1, param2, key);
if (newValue == null)
{
return null; // null value means no mapping is required
}
key = keyTransformer.value(key, newValue);
}
Entry<K, V> newEntry = new Entry<K, V>(key, newValue, (Entry<K, V>) o);
if (currentArray.compareAndSet(index, o, newEntry))
{
this.incrementSizeAndPossiblyResize(currentArray, length, o);
return null;
}
}
}
}
public boolean remove(Object key, Object value)
{
int hash = this.hash(key);
AtomicReferenceArray currentArray = this.table;
//noinspection LabeledStatement
outer:
while (true)
{
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == RESIZED || o == RESIZING)
{
currentArray = this.helpWithResizeWhileCurrentIndex(currentArray, index);
}
else
{
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object candidate = e.getKey();
if (candidate.equals(key) && this.nullSafeEquals(e.getValue(), value))
{
Entry<K, V> replacement = this.createReplacementChainForRemoval((Entry<K, V>) o, e);
if (currentArray.compareAndSet(index, o, replacement))
{
this.addToSize(-1);
return true;
}
//noinspection ContinueStatementWithLabel
continue outer;
}
e = e.getNext();
}
return false;
}
}
}
private void addToSize(int value)
{
if (this.partitionedSize != null)
{
if (this.incrementPartitionedSize(value))
{
return;
}
}
this.incrementLocalSize(value);
}
private boolean incrementPartitionedSize(int value)
{
int h = (int) Thread.currentThread().getId();
h ^= (h >>> 18) ^ (h >>> 12);
h = (h ^ (h >>> 10)) & SIZE_BUCKETS;
if (h != 0)
{
h = (h - 1) << 4;
while (true)
{
int localSize = this.partitionedSize.get(h);
if (this.partitionedSize.compareAndSet(h, localSize, localSize + value))
{
return true;
}
}
}
return false;
}
private void incrementLocalSize(int value)
{
while (true)
{
int localSize = this.size;
if (SIZE_UPDATER.compareAndSet(this, localSize, localSize + value))
{
break;
}
}
}
public int size()
{
int localSize = this.size;
if (this.partitionedSize != null)
{
for (int i = 0; i < SIZE_BUCKETS; i++)
{
localSize += this.partitionedSize.get(i << 4);
}
}
return localSize;
}
@Override
public boolean isEmpty()
{
return this.size() == 0;
}
public boolean containsKey(Object key)
{
return this.getEntry(key) != null;
}
public boolean containsValue(Object value)
{
AtomicReferenceArray currentArray = this.table;
ResizeContainer resizeContainer;
do
{
resizeContainer = null;
for (int i = 0; i < currentArray.length() - 1; i++)
{
Object o = currentArray.get(i);
if (o == RESIZED || o == RESIZING)
{
resizeContainer = (ResizeContainer) currentArray.get(currentArray.length() - 1);
}
else if (o != null)
{
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object v = e.getValue();
if (this.nullSafeEquals(v, value))
{
return true;
}
e = e.getNext();
}
}
}
if (resizeContainer != null)
{
if (resizeContainer.isNotDone())
{
this.helpWithResize(currentArray);
resizeContainer.waitForAllResizers();
}
currentArray = resizeContainer.nextArray;
}
}
while (resizeContainer != null);
return false;
}
private boolean nullSafeEquals(Object v, Object value)
{
return v == value || v != null && v.equals(value);
}
public V get(Object key)
{
int hash = this.hash(key);
AtomicReferenceArray currentArray = this.table;
int index = ConcurrentHashMap.indexFor(hash, currentArray.length());
Object o = currentArray.get(index);
if (o == RESIZED || o == RESIZING)
{
return this.slowGet(key, hash, index, currentArray);
}
for (Entry<K, V> e = (Entry<K, V>) o; e != null; e = e.getNext())
{
Object k;
if ((k = e.key) == key || key.equals(k))
{
return e.value;
}
}
return null;
}
private V slowGet(Object key, int hash, int index, AtomicReferenceArray currentArray)
{
while (true)
{
int length = currentArray.length();
index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == RESIZED || o == RESIZING)
{
currentArray = this.helpWithResizeWhileCurrentIndex(currentArray, index);
}
else
{
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object candidate = e.getKey();
if (candidate.equals(key))
{
return e.getValue();
}
e = e.getNext();
}
return null;
}
}
}
private Entry<K, V> getEntry(Object key)
{
int hash = this.hash(key);
AtomicReferenceArray currentArray = this.table;
while (true)
{
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == RESIZED || o == RESIZING)
{
currentArray = this.helpWithResizeWhileCurrentIndex(currentArray, index);
}
else
{
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object candidate = e.getKey();
if (candidate.equals(key))
{
return e;
}
e = e.getNext();
}
return null;
}
}
}
public V put(K key, V value)
{
int hash = this.hash(key);
AtomicReferenceArray currentArray = this.table;
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == null)
{
Entry<K, V> newEntry = new Entry<K, V>(key, value, null);
if (currentArray.compareAndSet(index, null, newEntry))
{
this.addToSize(1);
return null;
}
}
return this.slowPut(key, value, hash, currentArray);
}
private V slowPut(K key, V value, int hash, AtomicReferenceArray currentArray)
{
//noinspection LabeledStatement
outer:
while (true)
{
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == RESIZED || o == RESIZING)
{
currentArray = this.helpWithResizeWhileCurrentIndex(currentArray, index);
}
else
{
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object candidate = e.getKey();
if (candidate.equals(key))
{
V oldValue = e.getValue();
Entry<K, V> newEntry = new Entry<K, V>(e.getKey(), value, this.createReplacementChainForRemoval((Entry<K, V>) o, e));
if (!currentArray.compareAndSet(index, o, newEntry))
{
//noinspection ContinueStatementWithLabel
continue outer;
}
return oldValue;
}
e = e.getNext();
}
Entry<K, V> newEntry = new Entry<K, V>(key, value, (Entry<K, V>) o);
if (currentArray.compareAndSet(index, o, newEntry))
{
this.incrementSizeAndPossiblyResize(currentArray, length, o);
return null;
}
}
}
}
public void putAllInParallel(Map<K, V> map, int chunks, Executor executor)
{
if (this.size == 0)
{
int threshold = map.size();
threshold += threshold >> 1; // threshold = length * 0.75
int capacity = 1;
while (capacity < threshold)
{
capacity <<= 1;
}
this.resize(this.table, capacity + 1);
}
if (map instanceof ConcurrentHashMap<?, ?> && chunks > 1 && map.size() > 50000)
{
ConcurrentHashMap<K, V> incoming = (ConcurrentHashMap<K, V>) map;
final AtomicReferenceArray currentArray = incoming.table;
FutureTask<?>[] futures = new FutureTask<?>[chunks];
int chunkSize = currentArray.length() / chunks;
if (currentArray.length() % chunks != 0)
{
chunkSize++;
}
for (int i = 0; i < chunks; i++)
{
final int start = i * chunkSize;
final int end = Math.min((i + 1) * chunkSize, currentArray.length());
futures[i] = new FutureTask(new Runnable()
{
public void run()
{
ConcurrentHashMap.this.sequentialPutAll(currentArray, start, end);
}
}, null);
executor.execute(futures[i]);
}
for (int i = 0; i < chunks; i++)
{
try
{
futures[i].get();
}
catch (Exception e)
{
throw new RuntimeException("parallelForEachKeyValue failed", e);
}
}
}
else
{
this.putAll(map);
}
}
private void sequentialPutAll(AtomicReferenceArray currentArray, int start, int end)
{
for (int i = start; i < end; i++)
{
Object o = currentArray.get(i);
if (o == RESIZED || o == RESIZING)
{
throw new ConcurrentModificationException("can't iterate while resizing!");
}
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object key = e.getKey();
Object value = e.getValue();
this.put((K) key, (V) value);
e = e.getNext();
}
}
}
public void putAll(Map<? extends K, ? extends V> map)
{
MapIterate.forEachKeyValue(map, new Procedure2<K, V>()
{
public void value(K key, V value)
{
ConcurrentHashMap.this.put(key, value);
}
});
}
public void clear()
{
AtomicReferenceArray currentArray = this.table;
ResizeContainer resizeContainer;
do
{
resizeContainer = null;
for (int i = 0; i < currentArray.length() - 1; i++)
{
Object o = currentArray.get(i);
if (o == RESIZED || o == RESIZING)
{
resizeContainer = (ResizeContainer) currentArray.get(currentArray.length() - 1);
}
else if (o != null)
{
Entry<K, V> e = (Entry<K, V>) o;
if (currentArray.compareAndSet(i, o, null))
{
int removedEntries = 0;
while (e != null)
{
removedEntries++;
e = e.getNext();
}
this.addToSize(-removedEntries);
}
}
}
if (resizeContainer != null)
{
if (resizeContainer.isNotDone())
{
this.helpWithResize(currentArray);
resizeContainer.waitForAllResizers();
}
currentArray = resizeContainer.nextArray;
}
}
while (resizeContainer != null);
}
public Set<K> keySet()
{
return new KeySet();
}
public Collection<V> values()
{
return new Values();
}
public Set<Map.Entry<K, V>> entrySet()
{
return new EntrySet();
}
public boolean replace(K key, V oldValue, V newValue)
{
int hash = this.hash(key);
AtomicReferenceArray currentArray = this.table;
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == RESIZED || o == RESIZING)
{
return this.slowReplace(key, oldValue, newValue, hash, currentArray);
}
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object candidate = e.getKey();
if (candidate == key || candidate.equals(key))
{
if (oldValue == e.getValue() || (oldValue != null && oldValue.equals(e.getValue())))
{
Entry<K, V> replacement = this.createReplacementChainForRemoval((Entry<K, V>) o, e);
Entry<K, V> newEntry = new Entry<K, V>(key, newValue, replacement);
return currentArray.compareAndSet(index, o, newEntry) || this.slowReplace(key, oldValue, newValue, hash, currentArray);
}
return false;
}
e = e.getNext();
}
return false;
}
private boolean slowReplace(K key, V oldValue, V newValue, int hash, AtomicReferenceArray currentArray)
{
//noinspection LabeledStatement
outer:
while (true)
{
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == RESIZED || o == RESIZING)
{
currentArray = this.helpWithResizeWhileCurrentIndex(currentArray, index);
}
else
{
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object candidate = e.getKey();
if (candidate == key || candidate.equals(key))
{
if (oldValue == e.getValue() || (oldValue != null && oldValue.equals(e.getValue())))
{
Entry<K, V> replacement = this.createReplacementChainForRemoval((Entry<K, V>) o, e);
Entry<K, V> newEntry = new Entry<K, V>(key, newValue, replacement);
if (currentArray.compareAndSet(index, o, newEntry))
{
return true;
}
//noinspection ContinueStatementWithLabel
continue outer;
}
return false;
}
e = e.getNext();
}
return false;
}
}
}
public V replace(K key, V value)
{
int hash = this.hash(key);
AtomicReferenceArray currentArray = this.table;
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == null)
{
return null;
}
return this.slowReplace(key, value, hash, currentArray);
}
private V slowReplace(K key, V value, int hash, AtomicReferenceArray currentArray)
{
//noinspection LabeledStatement
outer:
while (true)
{
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == RESIZED || o == RESIZING)
{
currentArray = this.helpWithResizeWhileCurrentIndex(currentArray, index);
}
else
{
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object candidate = e.getKey();
if (candidate.equals(key))
{
V oldValue = e.getValue();
Entry<K, V> newEntry = new Entry<K, V>(e.getKey(), value, this.createReplacementChainForRemoval((Entry<K, V>) o, e));
if (!currentArray.compareAndSet(index, o, newEntry))
{
//noinspection ContinueStatementWithLabel
continue outer;
}
return oldValue;
}
e = e.getNext();
}
return null;
}
}
}
public V remove(Object key)
{
int hash = this.hash(key);
AtomicReferenceArray currentArray = this.table;
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == RESIZED || o == RESIZING)
{
return this.slowRemove(key, hash, currentArray);
}
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object candidate = e.getKey();
if (candidate.equals(key))
{
Entry<K, V> replacement = this.createReplacementChainForRemoval((Entry<K, V>) o, e);
if (currentArray.compareAndSet(index, o, replacement))
{
this.addToSize(-1);
return e.getValue();
}
return this.slowRemove(key, hash, currentArray);
}
e = e.getNext();
}
return null;
}
private V slowRemove(Object key, int hash, AtomicReferenceArray currentArray)
{
//noinspection LabeledStatement
outer:
while (true)
{
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == RESIZED || o == RESIZING)
{
currentArray = this.helpWithResizeWhileCurrentIndex(currentArray, index);
}
else
{
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object candidate = e.getKey();
if (candidate.equals(key))
{
Entry<K, V> replacement = this.createReplacementChainForRemoval((Entry<K, V>) o, e);
if (currentArray.compareAndSet(index, o, replacement))
{
this.addToSize(-1);
return e.getValue();
}
//noinspection ContinueStatementWithLabel
continue outer;
}
e = e.getNext();
}
return null;
}
}
}
private Entry<K, V> createReplacementChainForRemoval(Entry<K, V> original, Entry<K, V> toRemove)
{
if (original == toRemove)
{
return original.getNext();
}
Entry<K, V> replacement = null;
Entry<K, V> e = original;
while (e != null)
{
if (e != toRemove)
{
replacement = new Entry<K, V>(e.getKey(), e.getValue(), replacement);
}
e = e.getNext();
}
return replacement;
}
public void parallelForEachKeyValue(List<Procedure2<K, V>> blocks, Executor executor)
{
final AtomicReferenceArray currentArray = this.table;
int chunks = blocks.size();
if (chunks > 1)
{
FutureTask<?>[] futures = new FutureTask<?>[chunks];
int chunkSize = currentArray.length() / chunks;
if (currentArray.length() % chunks != 0)
{
chunkSize++;
}
for (int i = 0; i < chunks; i++)
{
final int start = i * chunkSize;
final int end = Math.min((i + 1) * chunkSize, currentArray.length());
final Procedure2<K, V> block = blocks.get(i);
futures[i] = new FutureTask(new Runnable()
{
public void run()
{
ConcurrentHashMap.this.sequentialForEachKeyValue(block, currentArray, start, end);
}
}, null);
executor.execute(futures[i]);
}
for (int i = 0; i < chunks; i++)
{
try
{
futures[i].get();
}
catch (Exception e)
{
throw new RuntimeException("parallelForEachKeyValue failed", e);
}
}
}
else
{
this.sequentialForEachKeyValue(blocks.get(0), currentArray, 0, currentArray.length());
}
}
private void sequentialForEachKeyValue(Procedure2<K, V> block, AtomicReferenceArray currentArray, int start, int end)
{
for (int i = start; i < end; i++)
{
Object o = currentArray.get(i);
if (o == RESIZED || o == RESIZING)
{
throw new ConcurrentModificationException("can't iterate while resizing!");
}
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object key = e.getKey();
Object value = e.getValue();
block.value((K) key, (V) value);
e = e.getNext();
}
}
}
public void parallelForEachValue(List<Procedure<V>> blocks, Executor executor)
{
final AtomicReferenceArray currentArray = this.table;
int chunks = blocks.size();
if (chunks > 1)
{
FutureTask<?>[] futures = new FutureTask<?>[chunks];
int chunkSize = currentArray.length() / chunks;
if (currentArray.length() % chunks != 0)
{
chunkSize++;
}
for (int i = 0; i < chunks; i++)
{
final int start = i * chunkSize;
final int end = Math.min((i + 1) * chunkSize, currentArray.length() - 1);
final Procedure<V> block = blocks.get(i);
futures[i] = new FutureTask(new Runnable()
{
public void run()
{
ConcurrentHashMap.this.sequentialForEachValue(block, currentArray, start, end);
}
}, null);
executor.execute(futures[i]);
}
for (int i = 0; i < chunks; i++)
{
try
{
futures[i].get();
}
catch (Exception e)
{
throw new RuntimeException("parallelForEachKeyValue failed", e);
}
}
}
else
{
this.sequentialForEachValue(blocks.get(0), currentArray, 0, currentArray.length());
}
}
private void sequentialForEachValue(Procedure<V> block, AtomicReferenceArray currentArray, int start, int end)
{
for (int i = start; i < end; i++)
{
Object o = currentArray.get(i);
if (o == RESIZED || o == RESIZING)
{
throw new ConcurrentModificationException("can't iterate while resizing!");
}
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object value = e.getValue();
block.value((V) value);
e = e.getNext();
}
}
}
@Override
public int hashCode()
{
int h = 0;
AtomicReferenceArray currentArray = this.table;
for (int i = 0; i < currentArray.length() - 1; i++)
{
Object o = currentArray.get(i);
if (o == RESIZED || o == RESIZING)
{
throw new ConcurrentModificationException("can't compute hashcode while resizing!");
}
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object key = e.getKey();
Object value = e.getValue();
h += (key == null ? 0 : key.hashCode()) ^ (value == null ? 0 : value.hashCode());
e = e.getNext();
}
}
return h;
}
@Override
public boolean equals(Object o)
{
if (o == this)
{
return true;
}
if (!(o instanceof Map))
{
return false;
}
Map<K, V> m = (Map<K, V>) o;
if (m.size() != this.size())
{
return false;
}
Iterator<Map.Entry<K, V>> i = this.entrySet().iterator();
while (i.hasNext())
{
Map.Entry<K, V> e = i.next();
K key = e.getKey();
V value = e.getValue();
if (value == null)
{
if (!(m.get(key) == null && m.containsKey(key)))
{
return false;
}
}
else
{
if (!value.equals(m.get(key)))
{
return false;
}
}
}
return true;
}
@Override
public String toString()
{
if (this.isEmpty())
{
return "{}";
}
Iterator<Map.Entry<K, V>> iterator = this.entrySet().iterator();
StringBuilder sb = new StringBuilder();
sb.append('{');
while (true)
{
Map.Entry<K, V> e = iterator.next();
K key = e.getKey();
V value = e.getValue();
sb.append(key == this ? "(this Map)" : key);
sb.append('=');
sb.append(value == this ? "(this Map)" : value);
if (!iterator.hasNext())
{
return sb.append('}').toString();
}
sb.append(", ");
}
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException
{
int size = in.readInt();
int capacity = 1;
while (capacity < size)
{
capacity <<= 1;
}
this.table = new AtomicReferenceArray(capacity + 1);
for (int i = 0; i < size; i++)
{
this.put((K) in.readObject(), (V) in.readObject());
}
}
public void writeExternal(ObjectOutput out) throws IOException
{
int size = this.size();
out.writeInt(size);
int count = 0;
for (int i = 0; i < this.table.length() - 1; i++)
{
Object o = this.table.get(i);
if (o == RESIZED || o == RESIZING)
{
throw new ConcurrentModificationException("Can't serialize while resizing!");
}
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
count++;
out.writeObject(e.getKey());
out.writeObject(e.getValue());
e = e.getNext();
}
}
if (count != size)
{
throw new ConcurrentModificationException("Map changed while serializing");
}
}
private static final class IteratorState
{
private AtomicReferenceArray currentTable;
private int start;
private int end;
private IteratorState(AtomicReferenceArray currentTable)
{
this.currentTable = currentTable;
this.end = this.currentTable.length() - 1;
}
private IteratorState(AtomicReferenceArray currentTable, int start, int end)
{
this.currentTable = currentTable;
this.start = start;
this.end = end;
}
}
private abstract class HashIterator<E> implements Iterator<E>
{
private List<IteratorState> todo = null;
private IteratorState currentState;
private Entry<K, V> next;
private int index = 0;
private Entry<K, V> current;
protected HashIterator()
{
if (!ConcurrentHashMap.this.isEmpty())
{
this.currentState = new IteratorState(ConcurrentHashMap.this.table);
this.findNext();
}
}
private void findNext()
{
while (this.index < this.currentState.end)
{
Object o = this.currentState.currentTable.get(this.index);
if (o == RESIZED || o == RESIZING)
{
AtomicReferenceArray nextArray = ConcurrentHashMap.this.helpWithResizeWhileCurrentIndex(this.currentState.currentTable, this.index);
int endResized = this.index + 1;
while (endResized < this.currentState.end)
{
if (this.currentState.currentTable.get(endResized) != RESIZED)
{
break;
}
endResized++;
}
if (this.todo == null)
{
this.todo = new FastList<IteratorState>(4);
}
if (endResized < this.currentState.end)
{
this.todo.add(new IteratorState(this.currentState.currentTable, endResized, this.currentState.end));
}
int powerTwoLength = this.currentState.currentTable.length() - 1;
this.todo.add(new IteratorState(nextArray, this.index + powerTwoLength, endResized + powerTwoLength));
this.currentState.currentTable = nextArray;
this.currentState.end = endResized;
this.currentState.start = this.index;
}
else if (o != null)
{
this.next = (Entry<K, V>) o;
this.index++;
break;
}
else
{
this.index++;
}
}
if (this.next == null && this.index == this.currentState.end && this.todo != null && !this.todo.isEmpty())
{
this.currentState = this.todo.remove(this.todo.size() - 1);
this.index = this.currentState.start;
this.findNext();
}
}
public final boolean hasNext()
{
return this.next != null;
}
final Entry<K, V> nextEntry()
{
Entry<K, V> e = this.next;
if (e == null)
{
throw new NoSuchElementException();
}
if ((this.next = e.getNext()) == null)
{
this.findNext();
}
this.current = e;
return e;
}
public void remove()
{
if (this.current == null)
{
throw new IllegalStateException();
}
K key = this.current.key;
this.current = null;
ConcurrentHashMap.this.remove(key);
}
}
private final class ValueIterator extends HashIterator<V>
{
public V next()
{
return this.nextEntry().value;
}
}
private final class KeyIterator extends HashIterator<K>
{
public K next()
{
return this.nextEntry().getKey();
}
}
private final class EntryIterator extends HashIterator<Map.Entry<K, V>>
{
public Map.Entry<K, V> next()
{
return this.nextEntry();
}
}
private final class KeySet extends AbstractSet<K>
{
@Override
public Iterator<K> iterator()
{
return new KeyIterator();
}
@Override
public int size()
{
return ConcurrentHashMap.this.size;
}
@Override
public boolean contains(Object o)
{
return ConcurrentHashMap.this.containsKey(o);
}
@Override
public boolean remove(Object o)
{
return ConcurrentHashMap.this.remove(o) != null;
}
@Override
public void clear()
{
ConcurrentHashMap.this.clear();
}
}
private final class Values extends AbstractCollection<V>
{
@Override
public Iterator<V> iterator()
{
return new ValueIterator();
}
@Override
public int size()
{
return ConcurrentHashMap.this.size;
}
@Override
public boolean contains(Object o)
{
return ConcurrentHashMap.this.containsValue(o);
}
@Override
public void clear()
{
ConcurrentHashMap.this.clear();
}
}
private final class EntrySet extends AbstractSet<Map.Entry<K, V>>
{
@Override
public Iterator<Map.Entry<K, V>> iterator()
{
return new EntryIterator();
}
@Override
public boolean contains(Object o)
{
if (!(o instanceof Map.Entry<?, ?>))
{
return false;
}
Map.Entry<K, V> e = (Map.Entry<K, V>) o;
Entry<K, V> candidate = ConcurrentHashMap.this.getEntry(e.getKey());
return candidate != null && candidate.equals(e);
}
@Override
public boolean remove(Object o)
{
if (!(o instanceof Map.Entry<?, ?>))
{
return false;
}
Map.Entry<K, V> e = (Map.Entry<K, V>) o;
return ConcurrentHashMap.this.remove(e.getKey(), e.getValue());
}
@Override
public int size()
{
return ConcurrentHashMap.this.size;
}
@Override
public void clear()
{
ConcurrentHashMap.this.clear();
}
}
private static final class Entry<K, V> implements Map.Entry<K, V>
{
private final K key;
private final V value;
private final Entry<K, V> next;
private Entry(K key, V value)
{
this.key = key;
this.value = value;
this.next = null;
}
private Entry(K key, V value, Entry<K, V> next)
{
this.key = key;
this.value = value;
this.next = next;
}
public K getKey()
{
return this.key;
}
public V getValue()
{
return this.value;
}
public V setValue(V value)
{
throw new RuntimeException("not implemented");
}
public Entry<K, V> getNext()
{
return this.next;
}
@Override
public boolean equals(Object o)
{
if (!(o instanceof Map.Entry<?, ?>))
{
return false;
}
Map.Entry<K, V> e = (Map.Entry<K, V>) o;
K k1 = this.key;
Object k2 = e.getKey();
if (k1 == k2 || k1 != null && k1.equals(k2))
{
V v1 = this.value;
Object v2 = e.getValue();
if (v1 == v2 || v1 != null && v1.equals(v2))
{
return true;
}
}
return false;
}
@Override
public int hashCode()
{
return (this.key == null ? 0 : this.key.hashCode()) ^ (this.value == null ? 0 : this.value.hashCode());
}
@Override
public String toString()
{
return this.key + "=" + this.value;
}
}
private static final class ResizeContainer
{
private static final int QUEUE_INCREMENT = Math.min(1 << 10, Integer.highestOneBit(Runtime.getRuntime().availableProcessors()) << 4);
private final AtomicInteger resizers = new AtomicInteger(1);
private final AtomicReferenceArray nextArray;
private final AtomicInteger queuePosition;
private ResizeContainer(AtomicReferenceArray nextArray, int oldSize)
{
this.nextArray = nextArray;
this.queuePosition = new AtomicInteger(oldSize);
}
public void incrementResizer()
{
this.resizers.incrementAndGet();
}
public void decrementResizerAndNotify()
{
int remaining = this.resizers.decrementAndGet();
if (remaining == 0)
{
synchronized (this)
{
this.notifyAll();
}
}
}
public int getQueuePosition()
{
return this.queuePosition.get();
}
public int subtractAndGetQueuePosition()
{
return this.queuePosition.addAndGet(-QUEUE_INCREMENT);
}
public void waitForAllResizers()
{
if (this.resizers.get() > 0)
{
for (int i = 0; i < 16; i++)
{
if (this.resizers.get() == 0)
{
break;
}
}
for (int i = 0; i < 16; i++)
{
if (this.resizers.get() == 0)
{
break;
}
Thread.yield();
}
}
if (this.resizers.get() > 0)
{
synchronized (this)
{
while (this.resizers.get() > 0)
{
try
{
this.wait();
}
catch (InterruptedException e)
{
// ignore
}
}
}
}
}
public boolean isNotDone()
{
return this.resizers.get() > 0;
}
public void zeroOutQueuePosition()
{
this.queuePosition.set(0);
}
}
public static <NK, NV> ConcurrentHashMap<NK, NV> newMap(Map<NK, NV> map)
{
ConcurrentHashMap<NK, NV> result = new ConcurrentHashMap<NK, NV>(map.size());
result.putAll(map);
return result;
}
@Override
public ConcurrentHashMap<K, V> withKeyValue(K key, V value)
{
return (ConcurrentHashMap<K, V>) super.withKeyValue(key, value);
}
@Override
public ConcurrentHashMap<K, V> withAllKeyValues(Iterable<? extends Pair<? extends K, ? extends V>> keyValues)
{
return (ConcurrentHashMap<K, V>) super.withAllKeyValues(keyValues);
}
@Override
public ConcurrentHashMap<K, V> withAllKeyValueArguments(Pair<? extends K, ? extends V>... keyValues)
{
return (ConcurrentHashMap<K, V>) super.withAllKeyValueArguments(keyValues);
}
@Override
public ConcurrentHashMap<K, V> withoutKey(K key)
{
return (ConcurrentHashMap<K, V>) super.withoutKey(key);
}
@Override
public ConcurrentHashMap<K, V> withoutAllKeys(Iterable<? extends K> keys)
{
return (ConcurrentHashMap<K, V>) super.withoutAllKeys(keys);
}
@Override
public MutableMap<K, V> clone()
{
return ConcurrentHashMap.newMap(this);
}
@Override
public <K, V> MutableMap<K, V> newEmpty(int capacity)
{
return ConcurrentHashMap.newMap();
}
@Override
public boolean notEmpty()
{
return !this.isEmpty();
}
@Override
public void forEach(Procedure<? super V> procedure)
{
IterableIterate.forEach(this.values(), procedure);
}
@Override
public void forEachWithIndex(ObjectIntProcedure<? super V> objectIntProcedure)
{
Iterate.forEachWithIndex(this.values(), objectIntProcedure);
}
@Override
public Iterator<V> iterator()
{
return this.values().iterator();
}
public MutableMap<K, V> newEmpty()
{
return ConcurrentHashMap.newMap();
}
@Override
public void forEachValue(Procedure<? super V> procedure)
{
IterableIterate.forEach(this.values(), procedure);
}
@Override
public void forEachKey(Procedure<? super K> procedure)
{
IterableIterate.forEach(this.keySet(), procedure);
}
public void forEachKeyValue(Procedure2<? super K, ? super V> procedure)
{
IterableIterate.forEach(this.entrySet(), new MapEntryToProcedure2<K, V>(procedure));
}
public <E> MutableMap<K, V> collectKeysAndValues(
Iterable<E> iterable,
Function<? super E, ? extends K> keyFunction,
Function<? super E, ? extends V> valueFunction)
{
Iterate.addToMap(iterable, keyFunction, valueFunction, this);
return this;
}
public V removeKey(K key)
{
return this.remove(key);
}
@Override
public <P> V getIfAbsentPutWith(K key, Function<? super P, ? extends V> function, P parameter)
{
int hash = this.hash(key);
AtomicReferenceArray currentArray = this.table;
V newValue = null;
boolean createdValue = false;
while (true)
{
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == RESIZED || o == RESIZING)
{
currentArray = this.helpWithResizeWhileCurrentIndex(currentArray, index);
}
else
{
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object candidate = e.getKey();
if (candidate.equals(key))
{
return e.getValue();
}
e = e.getNext();
}
if (!createdValue)
{
createdValue = true;
newValue = function.valueOf(parameter);
}
Entry<K, V> newEntry = new Entry<K, V>(key, newValue, (Entry<K, V>) o);
if (currentArray.compareAndSet(index, o, newEntry))
{
this.incrementSizeAndPossiblyResize(currentArray, length, o);
return newValue;
}
}
}
}
@Override
public V getIfAbsent(K key, Function0<? extends V> function)
{
V result = this.get(key);
if (result == null)
{
return function.value();
}
return result;
}
@Override
public <P> V getIfAbsentWith(
K key,
Function<? super P, ? extends V> function,
P parameter)
{
V result = this.get(key);
if (result == null)
{
return function.valueOf(parameter);
}
return result;
}
@Override
public <A> A ifPresentApply(K key, Function<? super V, ? extends A> function)
{
V result = this.get(key);
return result == null ? null : function.valueOf(result);
}
@Override
public <P> void forEachWith(Procedure2<? super V, ? super P> procedure, P parameter)
{
Iterate.forEachWith(this.values(), procedure, parameter);
}
@Override
public V updateValue(K key, Function0<? extends V> factory, Function<? super V, ? extends V> function)
{
int hash = this.hash(key);
AtomicReferenceArray currentArray = this.table;
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == null)
{
V result = function.valueOf(factory.value());
Entry<K, V> newEntry = new Entry<K, V>(key, result, null);
if (currentArray.compareAndSet(index, null, newEntry))
{
this.addToSize(1);
return result;
}
}
return this.slowUpdateValue(key, factory, function, hash, currentArray);
}
private V slowUpdateValue(K key, Function0<? extends V> factory, Function<? super V, ? extends V> function, int hash, AtomicReferenceArray currentArray)
{
//noinspection LabeledStatement
outer:
while (true)
{
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == RESIZED || o == RESIZING)
{
currentArray = this.helpWithResizeWhileCurrentIndex(currentArray, index);
}
else
{
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object candidate = e.getKey();
if (candidate.equals(key))
{
V oldValue = e.getValue();
V newValue = function.valueOf(oldValue);
Entry<K, V> newEntry = new Entry<K, V>(e.getKey(), newValue, this.createReplacementChainForRemoval((Entry<K, V>) o, e));
if (!currentArray.compareAndSet(index, o, newEntry))
{
//noinspection ContinueStatementWithLabel
continue outer;
}
return newValue;
}
e = e.getNext();
}
V result = function.valueOf(factory.value());
Entry<K, V> newEntry = new Entry<K, V>(key, result, (Entry<K, V>) o);
if (currentArray.compareAndSet(index, o, newEntry))
{
this.incrementSizeAndPossiblyResize(currentArray, length, o);
return result;
}
}
}
}
@Override
public <P> V updateValueWith(K key, Function0<? extends V> factory, Function2<? super V, ? super P, ? extends V> function, P parameter)
{
int hash = this.hash(key);
AtomicReferenceArray currentArray = this.table;
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == null)
{
V result = function.value(factory.value(), parameter);
Entry<K, V> newEntry = new Entry<K, V>(key, result, null);
if (currentArray.compareAndSet(index, null, newEntry))
{
this.addToSize(1);
return result;
}
}
return this.slowUpdateValueWith(key, factory, function, parameter, hash, currentArray);
}
private <P> V slowUpdateValueWith(
K key,
Function0<? extends V> factory,
Function2<? super V, ? super P, ? extends V> function,
P parameter,
int hash,
AtomicReferenceArray currentArray)
{
//noinspection LabeledStatement
outer:
while (true)
{
int length = currentArray.length();
int index = ConcurrentHashMap.indexFor(hash, length);
Object o = currentArray.get(index);
if (o == RESIZED || o == RESIZING)
{
currentArray = this.helpWithResizeWhileCurrentIndex(currentArray, index);
}
else
{
Entry<K, V> e = (Entry<K, V>) o;
while (e != null)
{
Object candidate = e.getKey();
if (candidate.equals(key))
{
V oldValue = e.getValue();
V newValue = function.value(oldValue, parameter);
Entry<K, V> newEntry = new Entry<K, V>(e.getKey(), newValue, this.createReplacementChainForRemoval((Entry<K, V>) o, e));
if (!currentArray.compareAndSet(index, o, newEntry))
{
//noinspection ContinueStatementWithLabel
continue outer;
}
return newValue;
}
e = e.getNext();
}
V result = function.value(factory.value(), parameter);
Entry<K, V> newEntry = new Entry<K, V>(key, result, (Entry<K, V>) o);
if (currentArray.compareAndSet(index, o, newEntry))
{
this.incrementSizeAndPossiblyResize(currentArray, length, o);
return result;
}
}
}
}
@Override
public ImmutableMap<K, V> toImmutable()
{
return Maps.immutable.ofMap(this);
}
}