org.h2.mvstore
Class Chunk

java.lang.Object
  org.h2.mvstore.Chunk

public class Chunk
extends java.lang.Object

A chunk of data, containing one or multiple pages.

Chunks are page aligned (each page is usually 4096 bytes). There are at most 67 million (2^26) chunks, each chunk is at most 2 GB large. File format: 1 byte: 'c' 4 bytes: length 4 bytes: chunk id (an incrementing number) 4 bytes: pageCount 8 bytes: metaRootPos 8 bytes: maxLengthLive [ Page ] *

Field Summary

int	collectPriority The garbage collection priority.
int	id The chunk id.
int	length The length in bytes.
long	maxLength The sum of the max length of all pages.
long	maxLengthLive The sum of the max length of all pages that are in use.
long	metaRootPos The position of the meta root.
int	pageCount The total number of pages in this chunk.
int	pageCountLive The number of pages still alive.
long	start The start position within the file.
long	time When this chunk was created, in milliseconds after the store was created.
long	version The version stored in this chunk.

Method Summary

java.lang.String	asString() Get the chunk data as a string.
boolean	equals(java.lang.Object o)
static Chunk	fromString(java.lang.String s) Build a block from the given string.
int	getFillRate()
int	hashCode()
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

id

public final int id

The chunk id.

start

public long start

The start position within the file.

length

public int length

The length in bytes.

pageCount

public int pageCount

The total number of pages in this chunk.

pageCountLive

public int pageCountLive

The number of pages still alive.

maxLength

public long maxLength

The sum of the max length of all pages.

maxLengthLive

public long maxLengthLive

The sum of the max length of all pages that are in use.

collectPriority

public int collectPriority

The garbage collection priority.

metaRootPos

public long metaRootPos

The position of the meta root.

version

public long version

The version stored in this chunk.

time

public long time

When this chunk was created, in milliseconds after the store was created.

Method Detail

fromString

public static Chunk fromString(java.lang.String s)

Build a block from the given string.

Parameters:

s - the string

Returns:

the block

getFillRate

public int getFillRate()

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

asString

public java.lang.String asString()

Get the chunk data as a string.

Returns:

the string

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object