Class OffHeapStore

java.lang.Object

org.h2.mvstore.FileStore

org.h2.mvstore.OffHeapStore

public class OffHeapStore
extends FileStore

A storage mechanism that "persists" data in the off-heap area of the main memory.

Field Summary

Fields

Modifier and Type	Field	Description
private final TreeMap<Long, ByteBuffer>	memory

Fields inherited from class FileStore

fileSize, freeSpace, readBytes, readCount, writeBytes, writeCount

Constructor Summary

Constructors

Constructor	Description
OffHeapStore()

Method Summary

Modifier and Type	Method	Description
void	close()	Close this store.
void	free(long pos, int length)	Mark the space as free.
int	getDefaultRetentionTime()	Get the default retention time for this store in milliseconds.
void	open(String fileName, boolean readOnly, char[] encryptionKey)	Try to open the file.
ByteBuffer	readFully(long pos, int len)	Read from the file.
void	sync()	Flush all changes.
String	toString()
void	truncate(long size)	Truncate the file.
void	writeFully(long pos, ByteBuffer src)	Write to the file.
private void	writeNewEntry(long pos, ByteBuffer src)

Methods inherited from class FileStore

allocate, clear, getAfterLastBlock, getEncryptedFile, getFile, getFileLengthInUse, getFileName, getFillRate, getFirstFree, getMovePriority, getProjectedFillRate, getReadBytes, getReadCount, getWriteBytes, getWriteCount, isFragmented, isReadOnly, markUsed, predictAllocation, size

Methods inherited from class Object

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

Field Details

memory

private final TreeMap<Long, ByteBuffer> memory

Constructor Details

OffHeapStore

public OffHeapStore()

Method Details

open

public void open(String fileName,
 boolean readOnly,
 char[] encryptionKey)

Description copied from class: FileStore

Try to open the file.

Overrides:

open in class FileStore

Parameters:

fileName - the file name

readOnly - whether the file should only be opened in read-only mode, even if the file is writable

encryptionKey - the encryption key, or null if encryption is not used

toString

public String toString()

Overrides:

toString in class FileStore

readFully

public ByteBuffer readFully(long pos,
 int len)

Description copied from class: FileStore

Read from the file.

Overrides:

readFully in class FileStore

Parameters:

pos - the write position

len - the number of bytes to read

Returns:

the byte buffer

free

public void free(long pos,
 int length)

Description copied from class: FileStore

Mark the space as free.

Overrides:

free in class FileStore

Parameters:

pos - the position in bytes

length - the number of bytes

writeFully

public void writeFully(long pos,
 ByteBuffer src)

Description copied from class: FileStore

Write to the file.

Overrides:

writeFully in class FileStore

Parameters:

pos - the write position

src - the source buffer

writeNewEntry

private void writeNewEntry(long pos,
 ByteBuffer src)

truncate

public void truncate(long size)

Description copied from class: FileStore

Truncate the file.

Overrides:

truncate in class FileStore

Parameters:

size - the new file size

close

public void close()

Description copied from class: FileStore

Close this store.

Overrides:

close in class FileStore

sync

public void sync()

Description copied from class: FileStore

Flush all changes.

Overrides:

sync in class FileStore

getDefaultRetentionTime

public int getDefaultRetentionTime()

Description copied from class: FileStore

Get the default retention time for this store in milliseconds.

Overrides:

getDefaultRetentionTime in class FileStore

Returns:

the retention time