org.apache.ignite.internal.pagemem.wal.record

Class PageSnapshot

java.lang.Object

org.apache.ignite.internal.pagemem.wal.record.WALRecord

org.apache.ignite.internal.pagemem.wal.record.PageSnapshot

All Implemented Interfaces:

WalRecordCacheGroupAware

public class PageSnapshot
extends WALRecord
implements WalRecordCacheGroupAware

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.ignite.internal.pagemem.wal.record.WALRecord

WALRecord.RecordPurpose, WALRecord.RecordType

Constructor Summary

Constructors

Constructor and Description
PageSnapshot(FullPageId fullId, byte[] arr, int realPageSize)
PageSnapshot(FullPageId fullPageId, long ptr, int pageSize, int realPageSize) This constructor doesn't actually create a page snapshot (copy), it creates a wrapper over page memory region.

Method Summary

Modifier and Type	Method and Description
FullPageId	fullPageId()
int	groupId()
byte[]	pageData()
ByteBuffer	pageDataBuffer()
int	pageDataSize()
int	realPageSize()
String	toString()
WALRecord.RecordType	type()

Methods inherited from class org.apache.ignite.internal.pagemem.wal.record.WALRecord

chainSize, chainSize, position, position, previous, previous, size, size

Methods inherited from class java.lang.Object

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

Constructor Detail

PageSnapshot

public PageSnapshot(FullPageId fullId,
                    byte[] arr,
                    int realPageSize)

Parameters:

fullId - Full page ID.

arr - Read array.

realPageSize - Page size without encryption overhead.

PageSnapshot

public PageSnapshot(FullPageId fullPageId,
                    long ptr,
                    int pageSize,
                    int realPageSize)

This constructor doesn't actually create a page snapshot (copy), it creates a wrapper over page memory region. A created record should not be used after WAL manager writes it to log, since page content can be modified.

Parameters:

fullPageId - Full page ID.

ptr - Pointer to wrap.

pageSize - Page size.

realPageSize - Page size without encryption overhead.

Method Detail

type

public WALRecord.RecordType type()

Specified by:

type in class WALRecord

Returns:

Entry type.

pageData

public byte[] pageData()

Returns:

Snapshot of page data.

pageDataSize

public int pageDataSize()

Returns:

Size of page data.

pageDataBuffer

public ByteBuffer pageDataBuffer()

Returns:

Page data byte buffer.

fullPageId

public FullPageId fullPageId()

Returns:

Full page ID.

groupId

public int groupId()

Specified by:

groupId in interface WalRecordCacheGroupAware

Returns:

Cache group ID.

realPageSize

public int realPageSize()

Returns:

PageSize without encryption overhead.

toString

public String toString()

Overrides:

toString in class WALRecord