Package org.cache2k.core

Class HeapCache.Tunable

java.lang.Object

org.cache2k.core.util.TunableConstants

org.cache2k.core.HeapCache.Tunable

All Implemented Interfaces:

Cloneable

Enclosing class:

HeapCache<K,V>

public static class HeapCache.Tunable
extends TunableConstants

Field Summary

Fields

Modifier and Type	Field	Description
StandardCommonMetricsFactory	commonMetricsFactory
org.cache2k.io.ExceptionPropagator	exceptionPropagator
int	minimumStatisticsCreationDeltaMillis	Some statistic values need processing time to gather and compute it.
int	minimumStatisticsCreationTimeDeltaFactor	Factor of the statistics creation time, that determines the time difference when new statistics are generated.
int	segmentCountOverride	Override parameter for segment count.
long	sharpExpirySafetyGapMillis	When sharp expiry is enabled, the expiry timer goes before the actual expiry to switch back to a time checking scheme when the cache is accessed.
ThreadFactoryProvider	threadFactoryProvider
long	timerLagMillis

Constructor Summary

Constructors

Constructor	Description
Tunable()

Method Summary

Methods inherited from class org.cache2k.core.util.TunableConstants

clone

Methods inherited from class java.lang.Object

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

Field Detail

sharpExpirySafetyGapMillis

public long sharpExpirySafetyGapMillis

When sharp expiry is enabled, the expiry timer goes before the actual expiry to switch back to a time checking scheme when the cache is accessed. This prevents that an expired value gets served by the cache when the time is too late. Experiments showed that a value of one second is usually sufficient.

OS scheduling is not reliable on virtual servers (e.g. KVM) to give the expiry task compute time on a busy server. To be safe in extreme cases, this parameter is set to a high value.

minimumStatisticsCreationDeltaMillis

public int minimumStatisticsCreationDeltaMillis

Some statistic values need processing time to gather and compute it. This is a safety time delta, to ensure that the machine is not busy due to statistics generation. Default: 333.

minimumStatisticsCreationTimeDeltaFactor

public int minimumStatisticsCreationTimeDeltaFactor

Factor of the statistics creation time, that determines the time difference when new statistics are generated.

threadFactoryProvider

public ThreadFactoryProvider threadFactoryProvider

commonMetricsFactory

public StandardCommonMetricsFactory commonMetricsFactory

exceptionPropagator

public org.cache2k.io.ExceptionPropagator exceptionPropagator

segmentCountOverride

public int segmentCountOverride

Override parameter for segment count. Has to be power of two, e.g. 2, 4, 8, etc. Invalid numbers will be replaced by the next higher power of two. Default is 0, no override.

timerLagMillis

public long timerLagMillis

Constructor Detail

Tunable

public Tunable()