org.compass.core.util.backport.java.util.concurrent
Class ConcurrentHashMap.HashEntry

java.lang.Object
  org.compass.core.util.backport.java.util.concurrent.ConcurrentHashMap.HashEntry

Enclosing class:

ConcurrentHashMap

static final class ConcurrentHashMap.HashEntry
extends Object

ConcurrentHashMap 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

(package private) int	hash
(package private) Object	key
(package private) ConcurrentHashMap.HashEntry	next
(package private) Object	value

Constructor Summary

ConcurrentHashMap.HashEntry(Object key, int hash, ConcurrentHashMap.HashEntry next, Object value)

Method Summary

(package private) static ConcurrentHashMap.HashEntry[]

newArray(int i)

Methods inherited from class java.lang.Object

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

Field Detail

key

final Object key

hash

final int hash

value

volatile Object value

next

final ConcurrentHashMap.HashEntry next

Constructor Detail

ConcurrentHashMap.HashEntry

ConcurrentHashMap.HashEntry(Object key,
                            int hash,
                            ConcurrentHashMap.HashEntry next,
                            Object value)

Method Detail

newArray

static final ConcurrentHashMap.HashEntry[] newArray(int i)