Package org.apache.ignite.internal.pagemem

Class PageIdUtils

java.lang.Object

org.apache.ignite.internal.pagemem.PageIdUtils

public final class PageIdUtils
extends Object

Utility class for page ID parts manipulation.

See Also:

FullPageId

Field Summary

Fields

Modifier and Type	Field	Description
static long	FLAG_MASK	Flags mask.
static int	FLAG_SIZE
static int	MAX_ITEMID_NUM	Max itemid number.
static long	MAX_PAGE_NUM	Maximum page number.
static int	MAX_PART_ID	Maximum page number.
static long	OFFSET_MASK
static int	OFFSET_SIZE
static long	PAGE_IDX_MASK
static int	PAGE_IDX_SIZE
static long	PART_ID_MASK	Page Index is a monotonically growing number within each partition
static int	PART_ID_SIZE
static long	TAG_MASK
static int	TAG_SIZE

Method Summary

Modifier and Type	Method	Description
static long	changePartitionId(long pageId, int partId)
static long	changeType(long pageId, byte type)	Change page type.
static long	effectivePageId(long link)
static byte	flag(long pageId)
static boolean	isEffectivePageId(long pageId)
static int	itemId(long link)	Index of the item inside of data page.
static long	link(long pageId, int itemId)	Constructs a page link by the given page ID and 8-byte words within the page.
static long	maskPartitionId(long pageId)	Masks partition ID from full page ID.
static long	pageId(int partId, byte flag, int pageIdx)
static long	pageId(long link)	Extracts a page ID from the given page link.
static int	pageIndex(long pageId)	Extracts a page index from the given page ID.
static int	partId(long pageId)
static long	rotatePageId(long pageId)
static long	rotationId(long pageId)	Returns the Rotation ID of a page identified by the given ID.
static int	tag(long link)	Tag of pageId
static String	toDetailString(long pageId)

Methods inherited from class java.lang.Object

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

Field Detail

PAGE_IDX_SIZE

public static final int PAGE_IDX_SIZE

See Also:

Constant Field Values

PART_ID_SIZE

public static final int PART_ID_SIZE

See Also:

Constant Field Values

FLAG_SIZE

public static final int FLAG_SIZE

See Also:

Constant Field Values

OFFSET_SIZE

public static final int OFFSET_SIZE

See Also:

Constant Field Values

TAG_SIZE

public static final int TAG_SIZE

See Also:

Constant Field Values

PAGE_IDX_MASK

public static final long PAGE_IDX_MASK

See Also:

Constant Field Values

OFFSET_MASK

public static final long OFFSET_MASK

See Also:

Constant Field Values

TAG_MASK

public static final long TAG_MASK

See Also:

Constant Field Values

PART_ID_MASK

public static final long PART_ID_MASK

Page Index is a monotonically growing number within each partition

See Also:

Constant Field Values

FLAG_MASK

public static final long FLAG_MASK

Flags mask. Flags consists from a number of reserved bits, and page type (data/index page)

See Also:

Constant Field Values

MAX_ITEMID_NUM

public static final int MAX_ITEMID_NUM

Max itemid number.

See Also:

Constant Field Values

MAX_PAGE_NUM

public static final long MAX_PAGE_NUM

Maximum page number.

See Also:

Constant Field Values

MAX_PART_ID

public static final int MAX_PART_ID

Maximum page number.

See Also:

Constant Field Values

Method Detail

link

public static long link(long pageId,
                        int itemId)

Constructs a page link by the given page ID and 8-byte words within the page.

Parameters:

pageId - Page ID.

itemId - Item ID.

Returns:

Page link.

pageIndex

public static int pageIndex(long pageId)

Extracts a page index from the given page ID.

Parameters:

pageId - Page ID.

Returns:

Page index.

pageId

public static long pageId(long link)

Extracts a page ID from the given page link.

Parameters:

link - Page link.

Returns:

Page ID.

effectivePageId

public static long effectivePageId(long link)

Parameters:

link - Page link.

Returns:

Effective page id.

isEffectivePageId

public static boolean isEffectivePageId(long pageId)

Parameters:

pageId - Page id.

Returns:

True if page id is equal to effective page id.

itemId

public static int itemId(long link)

Index of the item inside of data page.

Parameters:

link - Page link.

Returns:

Offset in 8-byte words.

tag

public static int tag(long link)

Tag of pageId

Parameters:

link - Page link.

Returns:

tag - item id + flags

pageId

public static long pageId(int partId,
                          byte flag,
                          int pageIdx)

Parameters:

partId - Partition ID.

flag - Flags (a number of reserved bits, and page type (data/index page))

pageIdx - Page index, monotonically growing number within each partition

Returns:

Page ID constructed from the given pageIdx and partition ID, see FullPageId

flag

public static byte flag(long pageId)

Parameters:

pageId - Page ID.

Returns:

Flag.

partId

public static int partId(long pageId)

Parameters:

pageId - Page ID.

Returns:

Partition.

rotationId

public static long rotationId(long pageId)

Returns the Rotation ID of a page identified by the given ID.

rotatePageId

public static long rotatePageId(long pageId)

Parameters:

pageId - Page ID.

Returns:

New page ID.

maskPartitionId

public static long maskPartitionId(long pageId)

Masks partition ID from full page ID.

Parameters:

pageId - Page ID to mask partition ID from.

changeType

public static long changeType(long pageId,
                              byte type)

Change page type.

Parameters:

pageId - Old page ID.

type - New page type.

Returns:

Changed page ID.

toDetailString

public static String toDetailString(long pageId)

Parameters:

pageId - Page id.

changePartitionId

public static long changePartitionId(long pageId,
                                     int partId)

Parameters:

pageId - Page ID.

partId - Partition ID.