Package org.h2.mvstore

Class OffHeapStore

java.lang.Object

org.h2.mvstore.FileStore<SFChunk>

org.h2.mvstore.RandomAccessStore

org.h2.mvstore.OffHeapStore

public class OffHeapStore
extends RandomAccessStore

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

Nested Class Summary

Nested classes/interfaces inherited from class org.h2.mvstore.FileStore

FileStore.PageSerializationManager

Field Summary

Fields inherited from class org.h2.mvstore.RandomAccessStore

freeSpace

Fields inherited from class org.h2.mvstore.FileStore

lastChunk, META_ID_KEY, PIPE_LENGTH, readBytes, readCount, recoveryMode, saveChunkLock, storeHeader, writeBytes, writeCount

Constructor Summary

Constructors

Constructor	Description
OffHeapStore()

Method Summary

Modifier and Type	Method	Description
void	backup(ZipOutputStream out)
void	free(long pos, int length)	Mark the space as free.
int	getDefaultRetentionTime()	Get the default retention time for this store in milliseconds.
OffHeapStore	open(String fileName, boolean readOnly)
void	open(String fileName, boolean readOnly, char[] encryptionKey)
ByteBuffer	readFully(SFChunk chunk, long pos, int len)	Read data from the store.
String	toString()
void	truncate(long size)
void	writeFully(SFChunk chunk, long pos, ByteBuffer src)	Write to the file.

Methods inherited from class org.h2.mvstore.RandomAccessStore

adjustStoreToLastChunk, allocateChunkSpace, clear, compactMoveChunks, compactStore, createChunk, createChunk, createChunk, doHousekeeping, freeChunkSpace, getAfterLastBlock_, getFillRate, getMovePriority, getRewriteCandidates, initializeStoreHeader, isSpaceReused, markUsed, readStoreHeader, setReuseSpace, shouldSaveNow, shrinkStoreIfPossible, validateFileLength, writeChunk, writeCleanShutdownMark

Methods inherited from class org.h2.mvstore.FileStore

accountForRemovedPage, bind, close, compact, compactStore, deregisterMapRoot, discoverChunk, dropUnusedChunks, executeFileStoreOperation, findLastChunkWithCompleteValidChunkSet, getAutoCommitDelay, getAutoCompactFillRate, getCacheHitRatio, getCacheSize, getCacheSizeUsed, getChunks, getChunksFillRate, getChunksFromLayoutMap, getCreationTime, getFileName, getLayoutMap, getMaxPageSize, getMetaMapId, getMvStore, getReadBytes, getReadCount, getRetentionTime, getRootPos, getStoreHeader, getTocCacheHitRatio, getWriteBuffer, getWriteCount, hasChangesSince, hasPersistentData, init, initializeCommonHeaderAttributes, isIdle, isKnownVersion, isReadOnly, isRegularMap, lastChunkVersion, populateInfo, processCommonHeaderAttributes, readChunkFooter, readChunkHeaderAndFooter, readChunkHeaderOptionally, readChunkHeaderOptionally, readFully, registerDeadChunk, releaseWriteBuffer, rewriteChunks, rollbackTo, saveChunkMetadataChanges, setAutoCommitDelay, setCacheSize, setLastChunk, setRetentionTime, setSize, size, start, stop, store, sync, writeCleanShutdown

Methods inherited from class java.lang.Object

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

Constructor Details

OffHeapStore

public OffHeapStore()

Method Details

open

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

Specified by:

open in class FileStore<SFChunk>

open

public OffHeapStore open(String fileName,
 boolean readOnly)

Specified by:

open in class FileStore<SFChunk>

toString

public String toString()

Overrides:

toString in class Object

readFully

public ByteBuffer readFully(SFChunk chunk,
 long pos,
 int len)

Description copied from class: FileStore

Read data from the store.

Specified by:

readFully in class FileStore<SFChunk>

Parameters:

chunk - that owns data to be read

pos - the read "position"

len - the number of bytes to read

Returns:

the byte buffer with data requested

free

public void free(long pos,
 int length)

Description copied from class: RandomAccessStore

Mark the space as free.

Overrides:

free in class RandomAccessStore

Parameters:

pos - the position in bytes

length - the number of bytes

writeFully

public void writeFully(SFChunk chunk,
 long pos,
 ByteBuffer src)

Description copied from class: FileStore

Write to the file.

Specified by:

writeFully in class FileStore<SFChunk>

Parameters:

chunk - to write

pos - the write position

src - the source buffer

truncate

public void truncate(long size)

Specified by:

truncate in class RandomAccessStore

getDefaultRetentionTime

public int getDefaultRetentionTime()

Description copied from class: FileStore

Get the default retention time for this store in milliseconds.

Overrides:

getDefaultRetentionTime in class FileStore<SFChunk>

Returns:

the retention time

backup

public void backup(ZipOutputStream out)

Specified by:

backup in class FileStore<SFChunk>