org.cache2k.storage

Class ImageFileStorage.Tunable

java.lang.Object

org.cache2k.impl.util.TunableConstants

org.cache2k.storage.ImageFileStorage.Tunable

All Implemented Interfaces:

Cloneable

Enclosing class:

ImageFileStorage

public static class ImageFileStorage.Tunable
extends TunableConstants

Some parameters factored out, which may be modified if needed. All these parameters have no effect on the written data format. Usually there is no need to change some of the values. This is basically provided for documentary reason and to have all "magic values" in a central place.

Field Summary

Fields

Modifier and Type	Field and Description
int	extensionSize The storage is expanded by the given increment, if set to 0 it is only expanded by the object size, each time to space is needed.
int	freeSpaceAfterMillis Time after unused space is finally freed and maybe reused.
byte	highestIndexNumber
int	indexFileFactor Factor of the entry count in the storage to limit the index file size.
int	rewriteCompleteFactor
int	rewritePartialFactor

Constructor Summary

Constructors

Constructor and Description
ImageFileStorage.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

indexFileFactor

public int indexFileFactor

Factor of the entry count in the storage to limit the index file size. After the limit a new file is started. Old entries are rewritten time after time to make the last file redundant and to free the disk space.

rewriteCompleteFactor

public int rewriteCompleteFactor

rewritePartialFactor

public int rewritePartialFactor

highestIndexNumber

public byte highestIndexNumber

extensionSize

public int extensionSize

The storage is expanded by the given increment, if set to 0 it is only expanded by the object size, each time to space is needed. Allocating space for each object separately is a big power drain.

freeSpaceAfterMillis

public int freeSpaceAfterMillis

Time after unused space is finally freed and maybe reused. We cannot reuse space immediately or do an update in place, since there may be ongoing read requests.

Constructor Detail

ImageFileStorage.Tunable

public ImageFileStorage.Tunable()