org.cache2k.impl

Class BaseCache.Tunable

java.lang.Object

org.cache2k.impl.util.TunableConstants

org.cache2k.impl.BaseCache.Tunable

All Implemented Interfaces:

Cloneable

Enclosing class:

BaseCache<E extends Entry,K,T>

public static class BaseCache.Tunable
extends TunableConstants

Field Summary

Fields

Modifier and Type	Field and Description
Class<? extends BaseCache>	defaultImplementation Implementation class to use by default.
boolean	disableHashRandomization The hash code will randomized by default.
int	hashLoadPercent Fill percentage limit.
int	hashSeed Seed used when randomization is disabled.
int	initialHashSize Size of the hash table before inserting the first entry.
boolean	logSourceExceptions Log exceptions from the source just as they happen.
int	maximumEntryLockSpins Limits the number of spins until an entry lock is expected to succeed.
int	maximumEvictSpins Maximum number of tries to find an entry for eviction if maximum size is reached.
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 get method is invoked.
int	waitForTimerJobsSeconds

Constructor Summary

Constructors

Constructor and Description
BaseCache.Tunable()

Method Summary

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

clone

Methods inherited from class java.lang.Object

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

Field Detail

defaultImplementation

public Class<? extends BaseCache> defaultImplementation

Implementation class to use by default.

logSourceExceptions

public boolean logSourceExceptions

Log exceptions from the source just as they happen. The log goes to the debug output of the cache log, debug level of the cache log must be enabled also.

waitForTimerJobsSeconds

public int waitForTimerJobsSeconds

maximumEntryLockSpins

public int maximumEntryLockSpins

Limits the number of spins until an entry lock is expected to succeed. The limit is to detect deadlock issues during development and testing. It is set to an arbitrary high value to result in an exception after about one second of spinning.

maximumEvictSpins

public int maximumEvictSpins

Maximum number of tries to find an entry for eviction if maximum size is reached.

initialHashSize

public int initialHashSize

Size of the hash table before inserting the first entry. Must be power of two. Default: 64.

hashLoadPercent

public int hashLoadPercent

Fill percentage limit. When this is reached the hash table will get expanded. Default: 64.

disableHashRandomization

public boolean disableHashRandomization

The hash code will randomized by default. This is a countermeasure against from outside that know the hash function.

hashSeed

public int hashSeed

Seed used when randomization is disabled. Default: 0.

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 get method is invoked. This prevents that an expired value gets served by the cache if the time is too late. A recent GC should not produce more then 200 milliseconds stall. If longer GC stalls are expected, this value needs to be changed. A value of LONG.MaxValue suppresses the timer usage completely.

Constructor Detail

BaseCache.Tunable

public BaseCache.Tunable()