Package org.h2.mvstore

Class SingleFileStore

java.lang.Object

org.h2.mvstore.FileStore<org.h2.mvstore.SFChunk>

org.h2.mvstore.RandomAccessStore

org.h2.mvstore.SingleFileStore

public class SingleFileStore
extends RandomAccessStore

The default storage mechanism of the MVStore. This implementation persists data to a file. The file store is responsible to persist data and for free space management.

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
SingleFileStore(Map<String,Object> config)

Method Summary

Modifier and Type	Method	Description
void	backup(ZipOutputStream out)
void	close()	Close this store.
static String	correctFileName(String f)	Fix the file name, replacing backslash with slash.
protected long	getAfterLastBlock_()
int	getMovePriority(int block)	Calculates relative "priority" for chunk to be moved.
SingleFileStore	open(String fileName, boolean readOnly)
void	open(String fileName, boolean readOnly, char[] encryptionKey)	Try to open the file.
ByteBuffer	readFully(org.h2.mvstore.SFChunk chunk, long pos, int len)	Read data from the store.
void	sync()	Flush all changes.
String	toString()
void	truncate(long size)	Truncate the file.
protected void	writeFully(org.h2.mvstore.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, free, freeChunkSpace, getFillRate, getRewriteCandidates, initializeStoreHeader, isSpaceReused, markUsed, readStoreHeader, setReuseSpace, shouldSaveNow, shrinkStoreIfPossible, validateFileLength, writeChunk, writeCleanShutdownMark

Methods inherited from class org.h2.mvstore.FileStore

accountForRemovedPage, bind, compact, compactStore, deregisterMapRoot, discoverChunk, dropUnusedChunks, executeFileStoreOperation, findLastChunkWithCompleteValidChunkSet, getAutoCommitDelay, getAutoCompactFillRate, getCacheHitRatio, getCacheSize, getCacheSizeUsed, getChunks, getChunksFillRate, getChunksFromLayoutMap, getCreationTime, getDefaultRetentionTime, 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, writeCleanShutdown

Methods inherited from class java.lang.Object

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

Constructor Details

SingleFileStore

public SingleFileStore(Map<String,Object> config)

Method Details

toString

public String toString()

Overrides:

toString in class Object

readFully

public ByteBuffer readFully(org.h2.mvstore.SFChunk chunk,
 long pos,
 int len)

Description copied from class: FileStore

Read data from the store.

Specified by:

readFully in class FileStore<org.h2.mvstore.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

writeFully

protected void writeFully(org.h2.mvstore.SFChunk chunk,
 long pos,
 ByteBuffer src)

Description copied from class: FileStore

Write to the file.

Specified by:

writeFully in class FileStore<org.h2.mvstore.SFChunk>

Parameters:

chunk - to write

pos - the write position

src - the source buffer

open

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

Try to open the file.

Specified by:

open in class FileStore<org.h2.mvstore.SFChunk>

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

open

public SingleFileStore open(String fileName,
 boolean readOnly)

Specified by:

open in class FileStore<org.h2.mvstore.SFChunk>

close

public void close()

Close this store.

Overrides:

close in class FileStore<org.h2.mvstore.SFChunk>

sync

public void sync()

Flush all changes.

Overrides:

sync in class FileStore<org.h2.mvstore.SFChunk>

truncate

public void truncate(long size)

Truncate the file.

Specified by:

truncate in class RandomAccessStore

Parameters:

size - the new file size

getMovePriority

public int getMovePriority(int block)

Calculates relative "priority" for chunk to be moved.

Overrides:

getMovePriority in class RandomAccessStore

Parameters:

block - where chunk starts

Returns:

priority, bigger number indicate that chunk need to be moved sooner

getAfterLastBlock_

protected long getAfterLastBlock_()

Overrides:

getAfterLastBlock_ in class RandomAccessStore

backup

public void backup(ZipOutputStream out)
            throws IOException

Specified by:

backup in class FileStore<org.h2.mvstore.SFChunk>

Throws:

IOException

correctFileName

public static String correctFileName(String f)

Fix the file name, replacing backslash with slash.

Parameters:

f - the file name

Returns:

the corrected file name