com.jn.langx.util.collection

类 CopyOnWriteHashMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

com.jn.langx.util.collection.CopyOnWriteHashMap<K,V>

所有已实现的接口:

Map<K,V>

public final class CopyOnWriteHashMap<K,V>
extends AbstractMap<K,V>

An immutable map whose writes result in a new copy of the map to be created.

This is essentially a hash array mapped trie: inner nodes use a bitmap in order to map hashes to slots by counting ones. In case of a collision (two values having the same 32-bits hash), a leaf node is created which stores and searches for values sequentially.

Reads and writes both perform in logarithmic time. Null keys and values are not supported.

This structure might need to perform several object creations per write so it is better suited for work-loads that are not too write-intensive.

另请参阅:

the wikipedia page

嵌套类概要

从类继承的嵌套类/接口 java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

从接口继承的嵌套类/接口 java.util.Map

Map.Entry<K,V>

构造器概要

构造器

构造器和说明
CopyOnWriteHashMap() Create a new empty map.

方法概要

限定符和类型	方法和说明
static <T> T[]	appendElement(T[] array, T element)
boolean	containsKey(Object key)
CopyOnWriteHashMap<K,V>	copyAndPut(K key, V value) Associate key with value and return a new copy of the hash table.
<K1 extends K,V1 extends V> CopyOnWriteHashMap<K,V>	copyAndPutAll(Iterable<Map.Entry<K1,V1>> entries)
CopyOnWriteHashMap<K,V>	copyAndPutAll(Map<? extends K,? extends V> other) Same as copyAndPut(Object, Object) but for an arbitrary number of entries.
CopyOnWriteHashMap<K,V>	copyAndRemove(Object key) Remove the given key from this map.
CopyOnWriteHashMap<K,V>	copyAndRemoveAll(Collection<?> keys) Same as copyAndRemove(Object) but for an arbitrary number of entries.
static <K,V> CopyOnWriteHashMap<K,V>	copyOf(Map<? extends K,? extends V> map) Return a copy of the provided map.
Set<Map.Entry<K,V>>	entrySet()
V	get(Object key)
static <T> T[]	insertElement(T[] array, T element, int index)
int	size()

从类继承的方法 java.util.AbstractMap

clear, clone, containsValue, equals, hashCode, isEmpty, keySet, put, putAll, remove, toString, values

从类继承的方法 java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

从接口继承的方法 java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

构造器详细资料

CopyOnWriteHashMap

public CopyOnWriteHashMap()

Create a new empty map.

方法详细资料

copyOf

public static <K,V> CopyOnWriteHashMap<K,V> copyOf(Map<? extends K,? extends V> map)

Return a copy of the provided map.

appendElement

public static <T> T[] appendElement(T[] array,
                                    T element)

insertElement

public static <T> T[] insertElement(T[] array,
                                    T element,
                                    int index)

containsKey

public boolean containsKey(Object key)

指定者:

containsKey 在接口中 Map<K,V>

覆盖:

containsKey 在类中 AbstractMap<K,V>

get

public V get(Object key)

指定者:

get 在接口中 Map<K,V>

覆盖:

get 在类中 AbstractMap<K,V>

size

public int size()

指定者:

size 在接口中 Map<K,V>

覆盖:

size 在类中 AbstractMap<K,V>

copyAndPut

public CopyOnWriteHashMap<K,V> copyAndPut(K key,
                                          V value)

Associate key with value and return a new copy of the hash table. The current hash table is not modified.

copyAndPutAll

public CopyOnWriteHashMap<K,V> copyAndPutAll(Map<? extends K,? extends V> other)

Same as copyAndPut(Object, Object) but for an arbitrary number of entries.

copyAndPutAll

public <K1 extends K,V1 extends V> CopyOnWriteHashMap<K,V> copyAndPutAll(Iterable<Map.Entry<K1,V1>> entries)

copyAndRemove

public CopyOnWriteHashMap<K,V> copyAndRemove(Object key)

Remove the given key from this map. The current hash table is not modified.

copyAndRemoveAll

public CopyOnWriteHashMap<K,V> copyAndRemoveAll(Collection<?> keys)

Same as copyAndRemove(Object) but for an arbitrary number of entries.

entrySet

public Set<Map.Entry<K,V>> entrySet()

指定者:

entrySet 在接口中 Map<K,V>

指定者:

entrySet 在类中 AbstractMap<K,V>