org.jboss.cache.eviction
Class AopLRUAlgorithm

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

All Implemented Interfaces:

EvictionAlgorithm

public class AopLRUAlgorithm
extends LRUAlgorithm

LRUAlgorithm specific to TreeCacheAop. Overriding couple of hooks to customize the algorithm such that it works correctly when using TreeCacheAop. The basic strategy for the AOP-specific case are:

• When a node is visited, it will check if it is an AOPInstance node. If it is, then it is an AOP node. In that case, we will update all children nodes' time stamp to synchronize with parent node.
• When a node is to be evicted, it will check if it an AOP node. If it is, we will traverse through the children nodes to see if their timestamp is younger. If it is younger, then we must not evict the whol aop node (i.e., parent node is not evicted either). Furthermore, we should synchronize the whole tree.

Author:

Ben Wang, Feb 17, 2004

Field Summary

Fields inherited from class org.jboss.cache.eviction.BaseEvictionAlgorithm

evictionQueue, recycleQueue, region

Constructor Summary

AopLRUAlgorithm()

Method Summary

protected java.util.Set	getAssociatedEvictNode(Fqn fqn) Hook for evict.
protected boolean	preAddedNodes(Fqn fqn) Hook for processAddedNodes.
protected boolean	preVisitedNodes(Fqn fqn, long stamp) Hook for processVisitedNodes

Methods inherited from class org.jboss.cache.eviction.LRUAlgorithm

prune, setupEvictionQueue, shouldEvictNode

Methods inherited from class org.jboss.cache.eviction.BaseEvictionAlgorithm

emptyRecycleQueue, evict, evictCacheNode, getEvictionQueue, initialize, process, processAddedNodes, processQueues, processRemovedNodes, processVisitedNodes, resetEvictionQueue

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.jboss.cache.eviction.EvictionAlgorithm

getEvictionQueue, process, resetEvictionQueue

Constructor Detail

AopLRUAlgorithm

public AopLRUAlgorithm()

Method Detail

getAssociatedEvictNode

protected java.util.Set getAssociatedEvictNode(Fqn fqn)

Hook for evict.

Parameters:

fqn -

Returns:

Set of associated node to evict as well in string

preAddedNodes

protected boolean preAddedNodes(Fqn fqn)

Hook for processAddedNodes.

preVisitedNodes

protected boolean preVisitedNodes(Fqn fqn,
                                  long stamp)

Hook for processVisitedNodes

Parameters:

fqn -

Returns:

true if it is successful