org.h2.mvstore

Class AppendOnlyMultiFileStore

java.lang.Object

org.h2.mvstore.FileStore<org.h2.mvstore.MFChunk>

org.h2.mvstore.AppendOnlyMultiFileStore

public final class AppendOnlyMultiFileStore
extends FileStore<org.h2.mvstore.MFChunk>

Class AppendOnlyMultiFileStore.

Nested Class Summary

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

FileStore.PageSerializationManager

Field Summary

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 and Description
AppendOnlyMultiFileStore(java.util.Map<java.lang.String,java.lang.Object> config)

Method Summary

Modifier and Type	Method and Description
protected void	adjustStoreToLastChunk() Make persistent changes after lastChunk was reset
protected void	allocateChunkSpace(org.h2.mvstore.MFChunk chunk, WriteBuffer buff) Allocate logical space and assign position of the buffer within the store.
void	backup(java.util.zip.ZipOutputStream out)
void	close() Close this store.
protected void	compactStore(int thresholdFillRate, long maxCompactTime, int maxWriteSize, MVStore mvStore) Compact store file, that is, compact blocks that have a low fill rate, and move chunks next to each other.
protected org.h2.mvstore.MFChunk	createChunk(int newChunkId)
protected org.h2.mvstore.MFChunk	createChunk(java.util.Map<java.lang.String,java.lang.String> map)
org.h2.mvstore.MFChunk	createChunk(java.lang.String s) Build a Chunk from the given string.
protected void	doHousekeeping(MVStore mvStore)
protected void	freeChunkSpace(java.lang.Iterable<org.h2.mvstore.MFChunk> chunks) Mark the space occupied by specified chunks as free.
int	getFillRate()
protected void	initializeStoreHeader(long time)
void	markUsed(long pos, int length) Mark the space as in use.
AppendOnlyMultiFileStore	open(java.lang.String fileName, boolean readOnly)
void	open(java.lang.String fileName, boolean readOnly, char[] encryptionKey)
java.nio.ByteBuffer	readFully(org.h2.mvstore.MFChunk chunk, long pos, int len) Read data from the store.
protected void	readStoreHeader(boolean recoveryMode)
boolean	shouldSaveNow(int unsavedMemory, int autoCommitMemory) Decision about autocommit is delegated to store
protected void	shrinkStoreIfPossible(int minPercent) Shrink store if possible, and if at least a given percentage can be saved.
protected boolean	validateFileLength(java.lang.String msg)
protected void	writeChunk(org.h2.mvstore.MFChunk chunk, WriteBuffer buff) Write buffer associated with chunk into store at chunk's allocated position
protected void	writeCleanShutdownMark() Performs final preparation before store is closed normally
protected void	writeFully(org.h2.mvstore.MFChunk chunk, long pos, java.nio.ByteBuffer src) Write to the file.

Methods inherited from class org.h2.mvstore.FileStore

accountForRemovedPage, bind, clear, 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, getRewriteCandidates, getRootPos, getStoreHeader, getTocCacheHitRatio, getWriteBuffer, getWriteCount, hasChangesSince, hasPersistentData, init, initializeCommonHeaderAttributes, isIdle, isKnownVersion, isReadOnly, isRegularMap, isSpaceReused, lastChunkVersion, populateInfo, processCommonHeaderAttributes, readChunkFooter, readChunkHeaderAndFooter, readChunkHeaderOptionally, readChunkHeaderOptionally, readFully, registerDeadChunk, releaseWriteBuffer, rewriteChunks, rollbackTo, saveChunkMetadataChanges, setAutoCommitDelay, setCacheSize, setLastChunk, setRetentionTime, setReuseSpace, setSize, size, start, stop, store, sync, writeCleanShutdown

Methods inherited from class java.lang.Object

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

Constructor Detail

AppendOnlyMultiFileStore

public AppendOnlyMultiFileStore(java.util.Map<java.lang.String,java.lang.Object> config)

Method Detail

createChunk

protected final org.h2.mvstore.MFChunk createChunk(int newChunkId)

Specified by:

createChunk in class FileStore<org.h2.mvstore.MFChunk>

createChunk

public org.h2.mvstore.MFChunk createChunk(java.lang.String s)

Description copied from class: FileStore

Build a Chunk from the given string.

Specified by:

createChunk in class FileStore<org.h2.mvstore.MFChunk>

Parameters:

s - the string

Returns:

the Chunk created

createChunk

protected org.h2.mvstore.MFChunk createChunk(java.util.Map<java.lang.String,java.lang.String> map)

Specified by:

createChunk in class FileStore<org.h2.mvstore.MFChunk>

shouldSaveNow

public boolean shouldSaveNow(int unsavedMemory,
                             int autoCommitMemory)

Description copied from class: FileStore

Decision about autocommit is delegated to store

Specified by:

shouldSaveNow in class FileStore<org.h2.mvstore.MFChunk>

Parameters:

unsavedMemory - amount of unsaved memory, so far

autoCommitMemory - configured limit on amount of unsaved memory

Returns:

true if commit should happen now

open

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

Specified by:

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

open

public AppendOnlyMultiFileStore open(java.lang.String fileName,
                                     boolean readOnly)

Specified by:

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

close

public void close()

Close this store.

Overrides:

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

writeFully

protected void writeFully(org.h2.mvstore.MFChunk chunk,
                          long pos,
                          java.nio.ByteBuffer src)

Description copied from class: FileStore

Write to the file.

Specified by:

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

Parameters:

chunk - to write

pos - the write position

src - the source buffer

readFully

public java.nio.ByteBuffer readFully(org.h2.mvstore.MFChunk chunk,
                                     long pos,
                                     int len)

Description copied from class: FileStore

Read data from the store.

Specified by:

readFully in class FileStore<org.h2.mvstore.MFChunk>

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

initializeStoreHeader

protected void initializeStoreHeader(long time)

Specified by:

initializeStoreHeader in class FileStore<org.h2.mvstore.MFChunk>

readStoreHeader

protected void readStoreHeader(boolean recoveryMode)

Specified by:

readStoreHeader in class FileStore<org.h2.mvstore.MFChunk>

allocateChunkSpace

protected void allocateChunkSpace(org.h2.mvstore.MFChunk chunk,
                                  WriteBuffer buff)

Description copied from class: FileStore

Allocate logical space and assign position of the buffer within the store.

Specified by:

allocateChunkSpace in class FileStore<org.h2.mvstore.MFChunk>

Parameters:

chunk - to allocate space for

buff - to allocate space for

writeChunk

protected void writeChunk(org.h2.mvstore.MFChunk chunk,
                          WriteBuffer buff)

Description copied from class: FileStore

Write buffer associated with chunk into store at chunk's allocated position

Specified by:

writeChunk in class FileStore<org.h2.mvstore.MFChunk>

Parameters:

chunk - chunk to write

buff - to write

writeCleanShutdownMark

protected void writeCleanShutdownMark()

Description copied from class: FileStore

Performs final preparation before store is closed normally

Specified by:

writeCleanShutdownMark in class FileStore<org.h2.mvstore.MFChunk>

adjustStoreToLastChunk

protected void adjustStoreToLastChunk()

Description copied from class: FileStore

Make persistent changes after lastChunk was reset

Specified by:

adjustStoreToLastChunk in class FileStore<org.h2.mvstore.MFChunk>

compactStore

protected void compactStore(int thresholdFillRate,
                            long maxCompactTime,
                            int maxWriteSize,
                            MVStore mvStore)

Description copied from class: FileStore

Compact store file, that is, compact blocks that have a low fill rate, and move chunks next to each other. This will typically shrink the file. Changes are flushed to the file, and old chunks are overwritten.

Specified by:

compactStore in class FileStore<org.h2.mvstore.MFChunk>

Parameters:

thresholdFillRate - do not compact if store fill rate above this value (0-100)

maxCompactTime - the maximum time in milliseconds to compact

maxWriteSize - the maximum amount of data to be written as part of this call

mvStore - that owns this FileStore

doHousekeeping

protected void doHousekeeping(MVStore mvStore)
                       throws java.lang.InterruptedException

Specified by:

doHousekeeping in class FileStore<org.h2.mvstore.MFChunk>

Throws:

java.lang.InterruptedException

getFillRate

public int getFillRate()

Specified by:

getFillRate in class FileStore<org.h2.mvstore.MFChunk>

shrinkStoreIfPossible

protected void shrinkStoreIfPossible(int minPercent)

Description copied from class: FileStore

Shrink store if possible, and if at least a given percentage can be saved.

Specified by:

shrinkStoreIfPossible in class FileStore<org.h2.mvstore.MFChunk>

Parameters:

minPercent - the minimum percentage to save

markUsed

public void markUsed(long pos,
                     int length)

Description copied from class: FileStore

Mark the space as in use.

Specified by:

markUsed in class FileStore<org.h2.mvstore.MFChunk>

Parameters:

pos - the position in bytes

length - the number of bytes

freeChunkSpace

protected void freeChunkSpace(java.lang.Iterable<org.h2.mvstore.MFChunk> chunks)

Description copied from class: FileStore

Mark the space occupied by specified chunks as free.

Specified by:

freeChunkSpace in class FileStore<org.h2.mvstore.MFChunk>

Parameters:

chunks - chunks to be processed

validateFileLength

protected boolean validateFileLength(java.lang.String msg)

Specified by:

validateFileLength in class FileStore<org.h2.mvstore.MFChunk>

backup

public void backup(java.util.zip.ZipOutputStream out)
            throws java.io.IOException

Specified by:

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

Throws:

java.io.IOException