org.springframework.util

类 ConcurrentReferenceHashMap.Segment

java.lang.Object

java.util.concurrent.locks.ReentrantLock

org.springframework.util.ConcurrentReferenceHashMap.Segment

所有已实现的接口:

Serializable, Lock

封闭类:

ConcurrentReferenceHashMap<K,V>

protected final class ConcurrentReferenceHashMap.Segment
extends ReentrantLock

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

另请参阅:

序列化表格

构造器概要

构造器

构造器和说明
Segment(int initialCapacity)

方法概要

限定符和类型	方法和说明
void	clear() Clear all items from this segment.
<T> T	doTask(int hash, Object key, 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.
ConcurrentReferenceHashMap.Reference<K,V>	getReference(Object key, int hash, ConcurrentReferenceHashMap.Restructure restructure)
int	getSize() Return the size of the current references array.
protected void	restructureIfNecessary(boolean allowResize) Restructure the underlying data structure when it becomes necessary.

从类继承的方法 java.util.concurrent.locks.ReentrantLock

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

从类继承的方法 java.lang.Object

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

构造器详细资料

Segment

public Segment(int initialCapacity)

方法详细资料

getReference

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

doTask

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

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

参数:

hash - the hash of the key

key - the key

task - the update operation

返回:

the result of the operation

clear

public void clear()

Clear all items from this segment.

restructureIfNecessary

protected final void restructureIfNecessary(boolean allowResize)

Restructure the underlying data structure when it becomes necessary. This method can increase the size of the references table as well as purge any references that have been garbage collected.

参数:

allowResize - if resizing is permitted

getSize

public final int getSize()

Return the size of the current references array.

getCount

public final int getCount()

Return the total number of references in this segment.