org.apache.ignite.internal.pagemem

Interface PageIdAllocator

All Known Subinterfaces:

PageMemory, PageMemoryEx

All Known Implementing Classes:

PageMemoryImpl, PageMemoryNoStoreImpl

public interface PageIdAllocator

Allocates page ID's.

Field Summary

Fields

Modifier and Type	Field and Description
static byte	FLAG_AUX Flag for an internal structure page.
static byte	FLAG_DATA Flag for a Data page.
static byte	FLAG_IDX Flag for an index page.
static int	INDEX_PARTITION Special partition reserved for index space.
static int	MAX_PARTITION_ID Max partition ID that can be used by affinity.
static long	META_PAGE_ID Cache group meta page id.

Method Summary

Modifier and Type	Method and Description
long	allocatePage(int grpId, int partId, byte flags) Allocates a page from the space for the given partition ID and the given flags.
boolean	freePage(int grpId, long pageId) The given page is free now.

Field Detail

FLAG_DATA

static final byte FLAG_DATA

Flag for a Data page. Also used by partition meta and tracking pages. This type doesn't use the Page ID rotation mechanism.

See Also:

Constant Field Values

FLAG_IDX

static final byte FLAG_IDX

Flag for an index page. Also used by internal structure in in-memory caches. This type uses the Page ID rotation mechanism.

See Also:

Constant Field Values

FLAG_AUX

static final byte FLAG_AUX

Flag for an internal structure page. This type uses the Page ID rotation mechanism.

See Also:

Constant Field Values

MAX_PARTITION_ID

static final int MAX_PARTITION_ID

Max partition ID that can be used by affinity.

See Also:

Constant Field Values

INDEX_PARTITION

static final int INDEX_PARTITION

Special partition reserved for index space.

See Also:

Constant Field Values

META_PAGE_ID

static final long META_PAGE_ID

Cache group meta page id.

Method Detail

allocatePage

long allocatePage(int grpId,
                  int partId,
                  byte flags)
           throws IgniteCheckedException

Allocates a page from the space for the given partition ID and the given flags.

Parameters:

grpId - Cache Group ID.

partId - Partition ID.

Returns:

Allocated page ID.

Throws:

IgniteCheckedException

freePage

boolean freePage(int grpId,
                 long pageId)

The given page is free now.

Parameters:

grpId - Cache Group ID.

pageId - Page ID.