org.springframework.util

Class ConcurrentReferenceHashMap.ReferenceManager

java.lang.Object

org.springframework.util.ConcurrentReferenceHashMap.ReferenceManager

Enclosing class:

ConcurrentReferenceHashMap<K,V>

protected class ConcurrentReferenceHashMap.ReferenceManager
extends java.lang.Object

Strategy class used to manage ConcurrentReferenceHashMap.References. This class can be overridden if alternative reference types need to be supported.

Field Summary

Fields

Modifier and Type	Field and Description
private java.lang.ref.ReferenceQueue<ConcurrentReferenceHashMap.Entry<K,V>>	queue

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ReferenceManager()

Method Summary

Modifier and Type	Method and Description
ConcurrentReferenceHashMap.Reference<K,V>	createReference(ConcurrentReferenceHashMap.Entry<K,V> entry, int hash, ConcurrentReferenceHashMap.Reference<K,V> next) Factory method used to create a new ConcurrentReferenceHashMap.Reference.
ConcurrentReferenceHashMap.Reference<K,V>	pollForPurge() Return any reference that has been garbage collected and can be purged from the underlying structure or null if no references need purging.

Methods inherited from class java.lang.Object

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

Field Detail

queue

private final java.lang.ref.ReferenceQueue<ConcurrentReferenceHashMap.Entry<K,V>> queue

Constructor Detail

ReferenceManager

protected ReferenceManager()

Method Detail

createReference

public ConcurrentReferenceHashMap.Reference<K,V> createReference(ConcurrentReferenceHashMap.Entry<K,V> entry,
                                                                 int hash,
                                                                 @Nullable
                                                                 ConcurrentReferenceHashMap.Reference<K,V> next)

Factory method used to create a new ConcurrentReferenceHashMap.Reference.

Parameters:

entry - the entry contained in the reference

hash - the hash

next - the next reference in the chain, or null if none

Returns:

a new ConcurrentReferenceHashMap.Reference

pollForPurge

@Nullable
public ConcurrentReferenceHashMap.Reference<K,V> pollForPurge()

Return any reference that has been garbage collected and can be purged from the underlying structure or null if no references need purging. This method must be thread safe and ideally should not block when returning null. References should be returned once and only once.

Returns:

a reference to purge or null