ca.uhn.cache.internal.impl
Class DefaultStaleChunkRule

java.lang.Object
  ca.uhn.cache.internal.impl.DefaultStaleChunkRule

All Implemented Interfaces:

IStaleChunkRule

public class DefaultStaleChunkRule

extends java.lang.Object

implements IStaleChunkRule

Default implementation of IStaleChunkRule.

Version:

$Revision: 1.1 $ updated on $Date: 2005/01/24 22:54:05 $ by $Author: bryan_tripp $

Author:

Bryan Tripp

Constructor Summary

DefaultStaleChunkRule(java.util.Map theVolatilityMap, java.util.Map theUpdateAgeMap, long theDefaultMaxAgeMillis)

Method Summary

long	getMaxAge(IChunk theChunk)

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultStaleChunkRule

public DefaultStaleChunkRule(java.util.Map theVolatilityMap,
                             java.util.Map theUpdateAgeMap,
                             long theDefaultMaxAgeMillis)

Parameters:

theVolatilityMap - keys are VolatilityEnum, values are corresponding max ages since cache time (type Long)

theUpdateAgeMap - keys are Long representing age since last update time, values are corresponding max ages since cache time (type Long)

theDefaultMaxAgeMillis - age at which chunk becomes stale by default, that is if it doesn't before stale sooner because of high volatility or recent last update

Method Detail

getMaxAge

public long getMaxAge(IChunk theChunk)

Specified by:

getMaxAge in interface IStaleChunkRule

Parameters:

theChunk - a chunk to be cached

Returns:

the age of the chunk (i.e. time since cache, in ms) after which the chunk must be evicted, because it is likely to be out of synch with the original data source. This is normally a function of last update time and volatility.

See Also:

IStaleChunkRule.getMaxAge(ca.uhn.cache.internal.IChunk)