Package org.apache.commons.collections4.map

Class ConcurrentReferenceHashMap.HashEntry<K,V>

java.lang.Object

org.apache.commons.collections4.map.ConcurrentReferenceHashMap.HashEntry<K,V>

Enclosing class:

ConcurrentReferenceHashMap<K,V>

private static final class ConcurrentReferenceHashMap.HashEntry<K,V>
extends Object

ConcurrentReferenceHashMap list entry. Note that this is never exported out as a user-visible Map.Entry.

Because the value field is volatile, not final, it is legal wrt the Java Memory Model for an unsynchronized reader to see null instead of initial value when read via a data race. Although a reordering leading to this is not likely to ever actually occur, the Segment.readValueUnderLock method is used as a backup in case a null (pre-initialized) value is ever seen in an unsynchronized access method.

Field Summary

Fields

Modifier and Type	Field	Description
private final int	hash
private final Object	keyRef
private final ConcurrentReferenceHashMap.HashEntry<K,V>	next
private Object	valueRef

Constructor Summary

Constructors

Constructor	Description
HashEntry(K key, int hash, ConcurrentReferenceHashMap.HashEntry<K,V> next, V value, ConcurrentReferenceHashMap.ReferenceType keyType, ConcurrentReferenceHashMap.ReferenceType valueType, ReferenceQueue<Object> refQueue)

Method Summary

Modifier and Type	Method	Description
(package private) V	dereferenceValue(Object value)
(package private) K	key()
(package private) static <K, V> ConcurrentReferenceHashMap.HashEntry<K,V>[]	newArray(int i)
(package private) Object	newKeyReference(K key, ConcurrentReferenceHashMap.ReferenceType keyType, ReferenceQueue<Object> refQueue)
(package private) Object	newValueReference(V value, ConcurrentReferenceHashMap.ReferenceType valueType, ReferenceQueue<Object> refQueue)
(package private) void	setValue(V value, ConcurrentReferenceHashMap.ReferenceType valueType, ReferenceQueue<Object> refQueue)
(package private) V	value()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

keyRef

private final Object keyRef

hash

private final int hash

valueRef

private volatile Object valueRef

next

private final ConcurrentReferenceHashMap.HashEntry<K,V> next

Constructor Details

HashEntry

HashEntry(K key,
 int hash,
 ConcurrentReferenceHashMap.HashEntry<K,V> next,
 V value,
 ConcurrentReferenceHashMap.ReferenceType keyType,
 ConcurrentReferenceHashMap.ReferenceType valueType,
 ReferenceQueue<Object> refQueue)

Method Details

newArray

static <K,
V>
ConcurrentReferenceHashMap.HashEntry<K,V>[] newArray(int i)

dereferenceValue

V dereferenceValue(Object value)

key

K key()

newKeyReference

Object newKeyReference(K key,
 ConcurrentReferenceHashMap.ReferenceType keyType,
 ReferenceQueue<Object> refQueue)

newValueReference

Object newValueReference(V value,
 ConcurrentReferenceHashMap.ReferenceType valueType,
 ReferenceQueue<Object> refQueue)

setValue

void setValue(V value,
 ConcurrentReferenceHashMap.ReferenceType valueType,
 ReferenceQueue<Object> refQueue)

value

V value()