com.github.netty.core.util

类 ConcurrentReferenceHashMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

com.github.netty.core.util.ConcurrentReferenceHashMap<K,V>

所有已实现的接口:

ConcurrentMap<K,V>, Map<K,V>

public class ConcurrentReferenceHashMap<K,V>
extends AbstractMap<K,V>
implements ConcurrentMap<K,V>

作者:

wangzihao

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	ConcurrentReferenceHashMap.ReferenceType Various reference types supported by this map.

从类继承的嵌套类/接口 java.util.AbstractMap

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

构造器概要

构造器

构造器和说明
ConcurrentReferenceHashMap() Create a new ConcurrentReferenceHashMap instance.
ConcurrentReferenceHashMap(int initialCapacity) Create a new ConcurrentReferenceHashMap instance.
ConcurrentReferenceHashMap(int initialCapacity, ConcurrentReferenceHashMap.ReferenceType referenceType) Create a new ConcurrentReferenceHashMap instance.
ConcurrentReferenceHashMap(int initialCapacity, float loadFactor) Create a new ConcurrentReferenceHashMap instance.
ConcurrentReferenceHashMap(int initialCapacity, float loadFactor, int concurrencyLevel) Create a new ConcurrentReferenceHashMap instance.
ConcurrentReferenceHashMap(int initialCapacity, float loadFactor, int concurrencyLevel, ConcurrentReferenceHashMap.ReferenceType referenceType) Create a new ConcurrentReferenceHashMap instance.
ConcurrentReferenceHashMap(int initialCapacity, int concurrencyLevel) Create a new ConcurrentReferenceHashMap instance.

方法概要

限定符和类型	方法和说明
void	clear()
boolean	containsKey(Object key)
Set<Map.Entry<K,V>>	entrySet()
V	get(Object key)
V	getOrDefault(Object key, V defaultValue)
boolean	isEmpty()
static boolean	nullSafeEquals(Object o1, Object o2)
static int	nullSafeHashCode(Object obj)
void	purgeUnreferencedEntries() Remove any entries that have been garbage collected and are no longer referenced.
V	put(K key, V value)
V	putIfAbsent(K key, V value)
V	remove(Object key)
boolean	remove(Object key, Object value)
V	replace(K key, V value)
boolean	replace(K key, V oldValue, V newValue)
int	size()

从类继承的方法 java.util.AbstractMap

containsValue, equals, hashCode, keySet, putAll, toString, values

从类继承的方法 java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

从接口继承的方法 java.util.concurrent.ConcurrentMap

compute, computeIfAbsent, computeIfPresent, forEach, merge, replaceAll

从接口继承的方法 java.util.Map

containsValue, equals, hashCode, keySet, putAll, values

构造器详细资料

ConcurrentReferenceHashMap

public ConcurrentReferenceHashMap()

Create a new ConcurrentReferenceHashMap instance.

ConcurrentReferenceHashMap

public ConcurrentReferenceHashMap(int initialCapacity)

Create a new ConcurrentReferenceHashMap instance.

参数:

initialCapacity - the initial capacity of the map

ConcurrentReferenceHashMap

public ConcurrentReferenceHashMap(int initialCapacity,
                                  float loadFactor)

Create a new ConcurrentReferenceHashMap instance.

参数:

initialCapacity - the initial capacity of the map

loadFactor - the load factor. When the average number of references per table exceeds this value resize will be attempted

ConcurrentReferenceHashMap

public ConcurrentReferenceHashMap(int initialCapacity,
                                  int concurrencyLevel)

Create a new ConcurrentReferenceHashMap instance.

参数:

initialCapacity - the initial capacity of the map

concurrencyLevel - the expected number of threads that will concurrently write to the map

ConcurrentReferenceHashMap

public ConcurrentReferenceHashMap(int initialCapacity,
                                  ConcurrentReferenceHashMap.ReferenceType referenceType)

Create a new ConcurrentReferenceHashMap instance.

参数:

initialCapacity - the initial capacity of the map

referenceType - the reference type used for entries (soft or weak)

ConcurrentReferenceHashMap

public ConcurrentReferenceHashMap(int initialCapacity,
                                  float loadFactor,
                                  int concurrencyLevel)

Create a new ConcurrentReferenceHashMap instance.

参数:

initialCapacity - the initial capacity of the map

loadFactor - the load factor. When the average number of references per table exceeds this value, resize will be attempted.

concurrencyLevel - the expected number of threads that will concurrently write to the map

ConcurrentReferenceHashMap

public ConcurrentReferenceHashMap(int initialCapacity,
                                  float loadFactor,
                                  int concurrencyLevel,
                                  ConcurrentReferenceHashMap.ReferenceType referenceType)

Create a new ConcurrentReferenceHashMap instance.

参数:

initialCapacity - the initial capacity of the map

loadFactor - the load factor. When the average number of references per table exceeds this value, resize will be attempted.

concurrencyLevel - the expected number of threads that will concurrently write to the map

referenceType - the reference type used for entries (soft or weak)

方法详细资料

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>

getOrDefault

public V getOrDefault(Object key,
                      V defaultValue)

指定者:

getOrDefault 在接口中 ConcurrentMap<K,V>

指定者:

getOrDefault 在接口中 Map<K,V>

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>

put

public V put(K key,
             V value)

指定者:

put 在接口中 Map<K,V>

覆盖:

put 在类中 AbstractMap<K,V>

putIfAbsent

public V putIfAbsent(K key,
                     V value)

指定者:

putIfAbsent 在接口中 ConcurrentMap<K,V>

指定者:

putIfAbsent 在接口中 Map<K,V>

remove

public V remove(Object key)

指定者:

remove 在接口中 Map<K,V>

覆盖:

remove 在类中 AbstractMap<K,V>

remove

public boolean remove(Object key,
                      Object value)

指定者:

remove 在接口中 ConcurrentMap<K,V>

指定者:

remove 在接口中 Map<K,V>

replace

public boolean replace(K key,
                       V oldValue,
                       V newValue)

指定者:

replace 在接口中 ConcurrentMap<K,V>

指定者:

replace 在接口中 Map<K,V>

replace

public V replace(K key,
                 V value)

指定者:

replace 在接口中 ConcurrentMap<K,V>

指定者:

replace 在接口中 Map<K,V>

clear

public void clear()

指定者:

clear 在接口中 Map<K,V>

覆盖:

clear 在类中 AbstractMap<K,V>

purgeUnreferencedEntries

public void purgeUnreferencedEntries()

Remove any entries that have been garbage collected and are no longer referenced. Under normal circumstances garbage collected entries are automatically purged as items are added or removed from the Map. This method can be used to force a purge, and is useful when the Map is read frequently but updated less often.

size

public int size()

指定者:

size 在接口中 Map<K,V>

覆盖:

size 在类中 AbstractMap<K,V>

isEmpty

public boolean isEmpty()

指定者:

isEmpty 在接口中 Map<K,V>

覆盖:

isEmpty 在类中 AbstractMap<K,V>

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>

nullSafeHashCode

public static int nullSafeHashCode(Object obj)

nullSafeEquals

public static boolean nullSafeEquals(Object o1,
                                     Object o2)