jetbrains.exodus.vfs

Class ClusteringStrategy

java.lang.Object

jetbrains.exodus.vfs.ClusteringStrategy

Direct Known Subclasses:

ClusteringStrategy.ExponentialClusteringStrategy, ClusteringStrategy.LinearClusteringStrategy, ClusteringStrategy.QuadraticClusteringStrategy

public abstract class ClusteringStrategy
extends java.lang.Object

ClusteringStrategy as a part of VfsConfig is specified on VirtualFileSystem creation. It defines the way the VirtualFileSystem splits contents of files on clusters. Each cluster is a single key/value pair in a Store of Environment used to create the VirtualFileSystem. The greater file is the more clusters are required to save its contents.

LINEAR clustering strategy says the VirtualFileSystem to create clusters of the same size.

QUADRATIC clustering strategy says the VirtualFileSystem to create new cluster greater than the previous one on a specific constant. This strategy is default.

EXPONENTIAL clustering strategy says the VirtualFileSystem to create new cluster of size which is multiple of the size of the previous cluster.

See Also:

VirtualFileSystem, VfsConfig, VfsConfig.getClusteringStrategy()

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ClusteringStrategy.ExponentialClusteringStrategy Exponential strategy: each cluster size is multiple of size of previous one (phi times more).
static class	ClusteringStrategy.LinearClusteringStrategy Linear strategy: all clusters are of the same size.
static class	ClusteringStrategy.QuadraticClusteringStrategy Quadratic strategy: each cluster size is greater than size of previous one on a constant (first cluster size).

Field Summary

Fields

Modifier and Type	Field and Description
static ClusteringStrategy	EXPONENTIAL
static ClusteringStrategy	LINEAR
static ClusteringStrategy	QUADRATIC

Constructor Summary

Constructors

Constructor and Description
ClusteringStrategy()

Method Summary

Modifier and Type	Method and Description
protected int	adjustClusterSize(int nextClusterSize)
abstract int	getFirstClusterSize()
int	getMaxClusterSize()
boolean	isLinear()
void	setMaxClusterSize(int maxClusterSize)

Methods inherited from class java.lang.Object

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

Field Detail

LINEAR

public static final ClusteringStrategy LINEAR

QUADRATIC

public static final ClusteringStrategy QUADRATIC

EXPONENTIAL

public static final ClusteringStrategy EXPONENTIAL

Constructor Detail

ClusteringStrategy

public ClusteringStrategy()

Method Detail

getFirstClusterSize

public abstract int getFirstClusterSize()

setMaxClusterSize

public void setMaxClusterSize(int maxClusterSize)

getMaxClusterSize

public int getMaxClusterSize()

isLinear

public boolean isLinear()

adjustClusterSize

protected int adjustClusterSize(int nextClusterSize)