Module org.apache.jena.dboe.base

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

Class BinaryDataFileWriteBuffered

java.lang.Object

org.apache.jena.dboe.base.file.BinaryDataFileWriteBuffered

All Implemented Interfaces:

org.apache.jena.atlas.lib.Closeable, org.apache.jena.atlas.lib.Sync, BinaryDataFile

public class BinaryDataFileWriteBuffered
extends Object
implements BinaryDataFile

Implementation of BinaryDataFile adding write buffering to another BinaryDataFile file, such as a BinaryDataFileRandomAccess.

• Thread-safe.
• No read buffering provided.
• The write buffer is flushed when switching to read.

Constructor Summary

Constructors

Constructor	Description
BinaryDataFileWriteBuffered(BinaryDataFile other)
BinaryDataFileWriteBuffered(BinaryDataFile other, int bufferSize)

Method Summary

Modifier and Type	Method	Description
void	close()
boolean	isOpen()	Is it open?
long	length()	Return the length of the file (including any buffered writes)
void	open()	Open the file
int	read(long posn, byte[] b, int start, int length)	Read into a byte array, returning the number of bytes read.
void	sync()
void	truncate(long posn)	Truncate the file
long	write(byte[] buf, int off, int len)	Write bytes - bytes are always written to the end of the file.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.jena.dboe.base.file.BinaryDataFile

isEmpty, read, write

Constructor Details

BinaryDataFileWriteBuffered

public BinaryDataFileWriteBuffered(BinaryDataFile other)

BinaryDataFileWriteBuffered

public BinaryDataFileWriteBuffered(BinaryDataFile other,
 int bufferSize)

Method Details

open

public void open()

Description copied from interface: BinaryDataFile

Open the file

Specified by:

open in interface BinaryDataFile

close

public void close()

Specified by:

close in interface BinaryDataFile

Specified by:

close in interface org.apache.jena.atlas.lib.Closeable

isOpen

public boolean isOpen()

Description copied from interface: BinaryDataFile

Is it open?

Specified by:

isOpen in interface BinaryDataFile

length

public long length()

Description copied from interface: BinaryDataFile

Return the length of the file (including any buffered writes)

Specified by:

length in interface BinaryDataFile

truncate

public void truncate(long posn)

Description copied from interface: BinaryDataFile

Truncate the file

Specified by:

truncate in interface BinaryDataFile

read

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

Description copied from interface: BinaryDataFile

Read into a byte array, returning the number of bytes read. Reads are at an absolute position and a read is atomic/thread-safe.

Specified by:

read in interface BinaryDataFile

Parameters:

posn - Location of the read operation.

start - of bytesarray to read into

length - Maximum number of bytes to read.

Returns:

The number of bytes read

write

public long write(byte[] buf,
 int off,
 int len)

Description copied from interface: BinaryDataFile

Write bytes - bytes are always written to the end of the file. Return the location where the write started.

Specified by:

write in interface BinaryDataFile

sync

public void sync()

Specified by:

sync in interface BinaryDataFile

Specified by:

sync in interface org.apache.jena.atlas.lib.Sync