Package org.apache.jena.dboe.base.file

Class SegmentedMemBuffer

java.lang.Object

org.apache.jena.dboe.base.file.SegmentedMemBuffer

public class SegmentedMemBuffer
extends Object

A segmented, expanding buffer of bytes. This class does not copy the underlying bytes when the file grows. Hence, the performance is more predictable. (Resizing a fixed size buffer is a copy c.f. performance issues with ArrayList or ByteArrayOutputStream as they go from small to large.

Constructor Summary

Constructors

Constructor	Description
SegmentedMemBuffer()
SegmentedMemBuffer(int chunk)

Method Summary

Modifier and Type	Method	Description
void	close()
boolean	isOpen()
long	length()
void	open()
int	read(long posn, byte[] b)
int	read(long posn, byte[] b, int start, int length)
int	read(long posn, ByteBuffer bb)
void	sync()
void	truncate(long length)
void	write(long posn, byte[] b)
void	write(long posn, byte[] b, int start, int length)
void	write(long posn, ByteBuffer bb)

Methods inherited from class java.lang.Object

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

Constructor Details

SegmentedMemBuffer

public SegmentedMemBuffer()

SegmentedMemBuffer

public SegmentedMemBuffer(int chunk)

Method Details

open

public void open()

isOpen

public boolean isOpen()

read

public int read(long posn,
 ByteBuffer bb)

read

public int read(long posn,
 byte[] b)

read

public int read(long posn,
 byte[] b,
 int start,
 int length)

write

public void write(long posn,
 ByteBuffer bb)

write

public void write(long posn,
 byte[] b)

write

public void write(long posn,
 byte[] b,
 int start,
 int length)

truncate

public void truncate(long length)

sync

public void sync()

close

public void close()

length

public long length()