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 说明 Segment(int initialCapacity)
方法概要
所有方法 实例方法 具体方法 修饰符和类型 方法 说明 voidclear()Clear all items from this segment.<T> TdoTask(int hash, Object key, org.springframework.util.ConcurrentReferenceHashMap.Task<T> task)Apply an update operation to this segment.intgetCount()Return the total number of references in this segment.ConcurrentReferenceHashMap.Reference<K,V>getReference(Object key, int hash, ConcurrentReferenceHashMap.Restructure restructure)intgetSize()Return the size of the current references array.protected voidrestructureIfNecessary(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
构造器详细资料
Segment
public Segment(int initialCapacity)
方法详细资料
getReference
public ConcurrentReferenceHashMap.Reference<K,V> getReference(Object key, int hash, ConcurrentReferenceHashMap.Restructure restructure)
doTask
public <T> T doTask(int hash, 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 keykey- the keytask- 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.