alluxio.worker.page

Class BlockPageId

java.lang.Object

alluxio.client.file.cache.PageId

alluxio.worker.page.BlockPageId

public final class BlockPageId
extends PageId

Specialized PageId when it's part of a block.

Constructor Summary

Constructors

Constructor and Description
BlockPageId(long blockId, long pageIndex, long blockSize) Creates an instance with a block ID as a long.
BlockPageId(String blockId, long pageIndex, long blockSize)

Method Summary

Modifier and Type	Method and Description
static BlockPageId	downcast(PageId pageId) Try to downcast a PageId to a BlockPageId.
boolean	equals(Object o)
static String	fileIdOf(long blockId, long blockSize)
long	getBlockId()
long	getBlockSize()
int	hashCode()
static BlockPageId	newTempPage(long blockId, long pageIndex) Creates a new page of the temporary block.
static long	parseBlockId(String fileId)
static long	parseBlockSize(String fileId)
static String	tempFileIdOf(long blockId)

Methods inherited from class alluxio.client.file.cache.PageId

getFileId, getPageIndex, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

BlockPageId

public BlockPageId(String blockId,
                   long pageIndex,
                   long blockSize)

Parameters:

blockId - string representation of the block ID in base 10

pageIndex - index of the page in the block

blockSize - block size

Throws:

NumberFormatException - when blockId cannot be parsed as a long

BlockPageId

public BlockPageId(long blockId,
                   long pageIndex,
                   long blockSize)

Creates an instance with a block ID as a long.

Parameters:

blockId - the block ID

pageIndex - index of the page in the block

blockSize - block size

Method Detail

newTempPage

public static BlockPageId newTempPage(long blockId,
                                      long pageIndex)

Creates a new page of the temporary block.

Parameters:

blockId -

pageIndex -

Returns:

page ID

fileIdOf

public static String fileIdOf(long blockId,
                              long blockSize)

Parameters:

blockId -

blockSize -

Returns:

file ID

tempFileIdOf

public static String tempFileIdOf(long blockId)

Parameters:

blockId -

Returns:

file ID

parseBlockId

public static long parseBlockId(String fileId)

Parameters:

fileId -

Returns:

block ID

Throws:

IllegalArgumentException - when the fileId does not contain a valid block ID

parseBlockSize

public static long parseBlockSize(String fileId)

Parameters:

fileId -

Returns:

block size

Throws:

IllegalArgumentException - when the fileId does not contain a valid block size

getBlockId

public long getBlockId()

Returns:

the block ID

getBlockSize

public long getBlockSize()

Returns:

the block size

downcast

public static BlockPageId downcast(PageId pageId)

Try to downcast a PageId to a BlockPageId. If the object is already a block page ID, then it is immediately returned. Otherwise, attempt to parse the fileId of the page if the encoded file name matches a block and contains all necessary metadata.

Parameters:

pageId - the page ID to downcast

Returns:

the downcast block page ID

Throws:

IllegalArgumentException - if the page ID cannot be cast to a block page ID

equals

public boolean equals(Object o)

Overrides:

equals in class PageId

hashCode

public int hashCode()

Overrides:

hashCode in class PageId