org.kariosdb.bigqueue.page

Class MappedPageImpl

java.lang.Object

org.kariosdb.bigqueue.page.MappedPageImpl

All Implemented Interfaces:

Closeable, AutoCloseable, IMappedPage

public class MappedPageImpl
extends Object
implements IMappedPage, Closeable

Constructor Summary

Constructors

Constructor and Description
MappedPageImpl(MappedByteBuffer mbb, String pageFile, long index)

Method Summary

Modifier and Type	Method and Description
void	close()
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
void	setNew(boolean isNew)
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

MappedPageImpl

public MappedPageImpl(MappedByteBuffer mbb,
                      String pageFile,
                      long index)

Method Detail

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Throws:

IOException

setNew

public void setNew(boolean isNew)

isNew

public boolean isNew()

Description copied from interface: IMappedPage

Is the mapped page new or was it read from disk

Specified by:

isNew in interface IMappedPage

Returns:

true if no file on disk existed

setDirty

public void setDirty(boolean dirty)

Description copied from interface: IMappedPage

Set if the mapped page has been changed or not

Specified by:

setDirty in interface IMappedPage

Parameters:

dirty - dirty flag to set

flush

public void flush()

Description copied from interface: IMappedPage

Persist any changes to disk

Specified by:

flush in interface IMappedPage

getLocal

public byte[] getLocal(int position,
                       int length)

Description copied from interface: IMappedPage

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

Specified by:

getLocal in interface IMappedPage

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

getLocal

public ByteBuffer getLocal(int position)

Description copied from interface: IMappedPage

Get a thread local copy of the mapped page buffer

Specified by:

getLocal in interface IMappedPage

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.

isClosed

public boolean isClosed()

Description copied from interface: IMappedPage

Check if this mapped page has been closed or not

Specified by:

isClosed in interface IMappedPage

Returns:

returns true if closed

toString

public String toString()

Overrides:

toString in class Object

getPageFile

public String getPageFile()

Description copied from interface: IMappedPage

The back page file name of the mapped page

Specified by:

getPageFile in interface IMappedPage

Returns:

name of page file

getPageIndex

public long getPageIndex()

Description copied from interface: IMappedPage

The index of the mapped page

Specified by:

getPageIndex in interface IMappedPage

Returns:

the index