org.mapdb

Class Volume.ByteBufferVol

java.lang.Object

org.mapdb.Volume

org.mapdb.Volume.ByteBufferVol

Direct Known Subclasses:

Volume.MappedFileVol, Volume.MemoryVol

Enclosing class:

Volume

public abstract static class Volume.ByteBufferVol
extends Volume

Abstract Volume over bunch of ByteBuffers It leaves ByteBufferVol details (allocation, disposal) on subclasses. Most methods are final for better performance (JIT compiler can inline those).

Nested Class Summary

Nested classes/interfaces inherited from class org.mapdb.Volume

Volume.ByteBufferVol, Volume.Factory, Volume.FileChannelVol, Volume.MappedFileVol, Volume.MemoryVol

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	asyncWriteEnabled if Async Write is enabled, do not use unmap hack see https://github.com/jankotek/MapDB/issues/442
protected ByteBuffer[]	chunks
protected int	chunkShift
protected int	chunkSize
protected int	chunkSizeModMask
protected ReentrantLock	growLock
protected boolean	hasLimit
protected boolean	readOnly
protected long	sizeLimit

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ByteBufferVol(boolean readOnly, long sizeLimit, int chunkShift)
protected	ByteBufferVol(boolean readOnly, long sizeLimit, int chunkShift, boolean asyncWriteEnabled)

Method Summary

Modifier and Type	Method and Description
byte	getByte(long offset)
DataInput2	getDataInput(long offset, int size)
int	getInt(long offset)
long	getLong(long offset)
boolean	isEmpty()
boolean	isSliced()
protected abstract ByteBuffer	makeNewBuffer(long offset)
void	putByte(long offset, byte value)
void	putData(long offset, byte[] src, int srcPos, int srcSize)
void	putData(long offset, ByteBuffer buf)
void	putInt(long offset, int value)
void	putLong(long offset, long value)
boolean	tryAvailable(long offset)
protected void	unmap(MappedByteBuffer b) Hack to unmap MappedByteBuffer.

Methods inherited from class org.mapdb.Volume

close, deleteFile, ensureAvailable, fileFactory, fileFactory, fileFactory, getFile, getPackedLong, getSixLong, getUnsignedByte, getUnsignedShort, memoryFactory, putPackedLong, putSixLong, putUnsignedByte, putUnsignedShort, sync, truncate, volumeForFile, volumeForFile, volumeTransfer

Methods inherited from class java.lang.Object

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

Field Detail

growLock

protected final ReentrantLock growLock

sizeLimit

protected final long sizeLimit

hasLimit

protected final boolean hasLimit

chunkShift

protected final int chunkShift

chunkSizeModMask

protected final int chunkSizeModMask

chunkSize

protected final int chunkSize

chunks

protected volatile ByteBuffer[] chunks

readOnly

protected final boolean readOnly

asyncWriteEnabled

protected final boolean asyncWriteEnabled

if Async Write is enabled, do not use unmap hack see https://github.com/jankotek/MapDB/issues/442

Constructor Detail

ByteBufferVol

protected ByteBufferVol(boolean readOnly,
                        long sizeLimit,
                        int chunkShift)

ByteBufferVol

protected ByteBufferVol(boolean readOnly,
                        long sizeLimit,
                        int chunkShift,
                        boolean asyncWriteEnabled)

Method Detail

tryAvailable

public final boolean tryAvailable(long offset)

Specified by:

tryAvailable in class Volume

makeNewBuffer

protected abstract ByteBuffer makeNewBuffer(long offset)

putLong

public final void putLong(long offset,
                          long value)

Specified by:

putLong in class Volume

putInt

public final void putInt(long offset,
                         int value)

Specified by:

putInt in class Volume

putByte

public final void putByte(long offset,
                          byte value)

Specified by:

putByte in class Volume

putData

public void putData(long offset,
                    byte[] src,
                    int srcPos,
                    int srcSize)

Specified by:

putData in class Volume

putData

public final void putData(long offset,
                          ByteBuffer buf)

Specified by:

putData in class Volume

getLong

public final long getLong(long offset)

Specified by:

getLong in class Volume

getInt

public final int getInt(long offset)

Specified by:

getInt in class Volume

getByte

public final byte getByte(long offset)

Specified by:

getByte in class Volume

getDataInput

public final DataInput2 getDataInput(long offset,
                                     int size)

Specified by:

getDataInput in class Volume

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in class Volume

isSliced

public boolean isSliced()

Specified by:

isSliced in class Volume

unmap

protected void unmap(MappedByteBuffer b)

Hack to unmap MappedByteBuffer. Unmap is necessary on Windows, otherwise file is locked until JVM exits or BB is GCed. There is no public JVM API to unmap buffer, so this tries to use SUN proprietary API for unmap. Any error is silently ignored (for example SUN API does not exist on Android).