LRUAlgorithm (JBoss Cache API) - JBoss 3.2.7 Cache API Documentation 英文版文档

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org.jboss.cache.eviction
Class LRUAlgorithm

java.lang.Object
  org.jboss.cache.eviction.LRUAlgorithm

All Implemented Interfaces:: EvictionAlgorithm

Direct Known Subclasses:: FIFOAlgorithm

public class LRUAlgorithm
extends Object
implements EvictionAlgorithm

Least recently Used algorithm to purge old data. Note that this algorithm is not thread-safe.

Author:: Ben Wang 02-2004

Field Summary

protected NodeEntry head_


protected org.jboss.logging.Logger log_


protected Map nodeMap_


protected Region region_


protected NodeEntry tail_


Constructor Summary

LRUAlgorithm()


Method Summary

protected void demote(Fqn fqn)


protected void evict(Fqn fqn)


int evictionQueueSize()


void process(Region region)
          No lock is used here since we assume it is single-threaded access by the timer only.

void resetEvictionQueue(Region region)
          Reset the whole eviction queue.

Methods inherited from class java.lang.Object

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

Field Detail

log_

protected org.jboss.logging.Logger log_

nodeMap_

protected Map nodeMap_

head_

protected NodeEntry head_

tail_

protected NodeEntry tail_

region_

protected Region region_

Constructor Detail

LRUAlgorithm

public LRUAlgorithm()

Method Detail

process

public void process(Region region)
             throws EvictionException

No lock is used here since we assume it is single-threaded access by the timer only.

Specified by:: process in interface EvictionAlgorithm

Parameters:: region -
Throws:: EvictionException

resetEvictionQueue

public void resetEvictionQueue(Region region)

Description copied from interface: EvictionAlgorithm

Reset the whole eviction queue. Queue may needs to be reset due to corrupted state, for example.

Specified by:: resetEvictionQueue in interface EvictionAlgorithm

Parameters:: region - Region that this algorithm will operate on.

demote

protected void demote(Fqn fqn)
               throws EvictionException

Throws:: EvictionException

evict

protected void evict(Fqn fqn)
              throws EvictionException

Throws:: EvictionException

evictionQueueSize

public int evictionQueueSize()