Class ConcurrentReferenceHashMap.Segment

java.lang.Object

java.util.concurrent.locks.ReentrantLock

org.springframework.util.ConcurrentReferenceHashMap.Segment

All Implemented Interfaces:

Serializable, Lock

Enclosing class:

ConcurrentReferenceHashMap<K,V>

protected final class ConcurrentReferenceHashMap.Segment
extends ReentrantLock

A single segment used to divide the map to allow better concurrent performance.

Since:

3.2

Author:

Phillip Webb, Juergen Hoeller, Brian Clozel

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
Segment(int initialSize, int resizeThreshold)

Method Summary

Modifier and Type	Method	Description
void	clear()	Clear all items from this segment.
<T> @Nullable T	doTask(int hash, @Nullable Object key, ConcurrentReferenceHashMap<K,V>.org.springframework.util.ConcurrentReferenceHashMap.Task<T> task)	Apply an update operation to this segment.
int	getCount()	Return the total number of references in this segment.
@Nullable ConcurrentReferenceHashMap.Reference<K,V>	getReference(@Nullable Object key, int hash, ConcurrentReferenceHashMap.Restructure restructure)
int	getSize()	Return the size of the current references array.

Methods inherited from class ReentrantLock

getHoldCount, getOwner, getQueuedThreads, getQueueLength, getWaitingThreads, getWaitQueueLength, hasQueuedThread, hasQueuedThreads, hasWaiters, isFair, isHeldByCurrentThread, isLocked, lock, lockInterruptibly, newCondition, toString, tryLock, tryLock, unlock

Methods inherited from class Object

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

Constructor Details

Segment

public Segment(int initialSize,
 int resizeThreshold)

Method Details

getReference

public @Nullable ConcurrentReferenceHashMap.Reference<K,V> getReference(@Nullable Object key,
 int hash,
 ConcurrentReferenceHashMap.Restructure restructure)

doTask

public <T> @Nullable T doTask(int hash,
 @Nullable Object key,
 ConcurrentReferenceHashMap<K,V>.org.springframework.util.ConcurrentReferenceHashMap.Task<T> task)

Apply an update operation to this segment. The segment will be locked during the update.

Parameters:

hash - the hash of the key

key - the key

task - the update operation

Returns:

the result of the operation

clear

public void clear()

Clear all items from this segment.

getSize

public int getSize()

Return the size of the current references array.

getCount

public int getCount()

Return the total number of references in this segment.