org.jboss.cache.eviction
Class FIFOAlgorithm

java.lang.Object
  org.jboss.cache.eviction.BaseEvictionAlgorithm
      org.jboss.cache.eviction.FIFOAlgorithm

All Implemented Interfaces:

EvictionAlgorithm

public class FIFOAlgorithm
extends BaseEvictionAlgorithm

First-in-first-out algorithm used to evict nodes.

Version:

$Revision: 7168 $

Author:

Daniel Huang - dhuang@jboss.org, Morten Kvistgaard

Field Summary

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

allowTombstones, cache, configuration, evictionActionPolicy, evictionAlgorithmConfig, evictionQueue, recycleQueue, regionFqn

Constructor Summary

FIFOAlgorithm()

Method Summary

Class<? extends EvictionAlgorithmConfig>	getConfigurationClass() This is a helper so that the XML parser will be able to select and use the correct EvictionAlgorithmConfig implementation class corresponding to this EvictionAlgorithm.
protected EvictionQueue	setupEvictionQueue() This method will create an EvictionQueue implementation and prepare it for use.
protected boolean	shouldEvictNode(NodeEntry ne) For FIFO, a node should be evicted if the queue size is >= to the configured maxNodes size.

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

assignToRegion, canIgnoreEvent, emptyRecycleQueue, evict, evictCacheNode, getEvictionActionPolicy, getEvictionAlgorithmConfig, getEvictionQueue, getNextInQueue, initialize, isNodeInUseAndNotTimedOut, isYoungerThanMinimumTimeToLive, process, processAddedElement, processAddedNodes, processAddedNodes, processMarkInUseNodes, processQueues, processRemovedElement, processRemovedNodes, processUnmarkInUseNodes, processVisitedNodes, prune, resetEvictionQueue, setEvictionActionPolicy, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

FIFOAlgorithm

public FIFOAlgorithm()

Method Detail

setupEvictionQueue

protected EvictionQueue setupEvictionQueue()
                                    throws EvictionException

Description copied from class: BaseEvictionAlgorithm

This method will create an EvictionQueue implementation and prepare it for use.

Specified by:

setupEvictionQueue in class BaseEvictionAlgorithm

Returns:

The created EvictionQueue to be used as the eviction queue for this algorithm.

Throws:

EvictionException - if there are problems

See Also:

EvictionQueue

shouldEvictNode

protected boolean shouldEvictNode(NodeEntry ne)

For FIFO, a node should be evicted if the queue size is >= to the configured maxNodes size.

Specified by:

shouldEvictNode in class BaseEvictionAlgorithm

Parameters:

ne - NodeEntry to test eviction for.

Returns:

True if the given node should be evicted. False if the given node should not be evicted.

getConfigurationClass

public Class<? extends EvictionAlgorithmConfig> getConfigurationClass()

Description copied from interface: EvictionAlgorithm

This is a helper so that the XML parser will be able to select and use the correct EvictionAlgorithmConfig implementation class corresponding to this EvictionAlgorithm. E.g., the FIFOAlgorithm would return FIFOAlgorithmConfig.class.

Returns:

a class that is used to configure this EvictionAlgorithm.