org.kariosdb.bigqueue.page

Interface IMappedPage

All Known Implementing Classes:

MappedPageImpl

public interface IMappedPage

Memory mapped page file ADT

Author:

bulldog

Method Summary

Modifier and Type	Method and Description
void	flush() Persist any changes to disk
ByteBuffer	getLocal(int position) Get a thread local copy of the mapped page buffer
byte[]	getLocal(int position, int length) Get data from a thread local copy of the mapped page buffer
String	getPageFile() The back page file name of the mapped page
long	getPageIndex() The index of the mapped page
boolean	isClosed() Check if this mapped page has been closed or not
boolean	isNew() Is the mapped page new or was it read from disk
void	setDirty(boolean dirty) Set if the mapped page has been changed or not

Method Detail

getLocal

ByteBuffer getLocal(int position)

Get a thread local copy of the mapped page buffer

Parameters:

position - start position(relative to the start position of source mapped page buffer) of the thread local buffer

Returns:

a byte buffer with specific position as start position.

getLocal

byte[] getLocal(int position,
                int length)

Get data from a thread local copy of the mapped page buffer

Parameters:

position - start position(relative to the start position of source mapped page buffer) of the thread local buffer

length - the length to fetch

Returns:

byte data

isClosed

boolean isClosed()

Check if this mapped page has been closed or not

Returns:

returns true if closed

isNew

boolean isNew()

Is the mapped page new or was it read from disk

Returns:

true if no file on disk existed

setDirty

void setDirty(boolean dirty)

Set if the mapped page has been changed or not

Parameters:

dirty - dirty flag to set

getPageFile

String getPageFile()

The back page file name of the mapped page

Returns:

name of page file

getPageIndex

long getPageIndex()

The index of the mapped page

Returns:

the index

flush

void flush()

Persist any changes to disk