com.sleepycat.je.tree

Class VersionedLN

java.lang.Object

com.sleepycat.je.tree.Node

com.sleepycat.je.tree.LN

com.sleepycat.je.tree.VersionedLN

All Implemented Interfaces:

Loggable, VersionedWriteLoggable

public class VersionedLN
extends LN

VersionedLN is used to provide an in-memory representation of an LN that makes its VLSN available through btree access. On disk, each log entry is composed of a header (je.log.LogEntryHeader) and a body (je.log.entry.LogEntry). When an LN is materialized in the Btree, it usually holds only the body, and does not have access to information in the log entry header, such as the VLSN. Since version based API operations need access to the VLSN, environments which are configured with je.rep.preserveRecordVersion=true instantiate VersionedLNs instead of LNs, in order to cache the VLSN with the LN, and make it cheaply available to Btree operations.

Field Summary

Fields inherited from class com.sleepycat.je.tree.Node

NULL_NODE_ID

Constructor Summary

Constructors

Constructor and Description
VersionedLN()
VersionedLN(SizeofMarker marker, DatabaseEntry dbt) For Sizeof.

Method Summary

Modifier and Type	Method and Description
long	getMemorySizeIncludedByParent() Add additional size taken by this LN subclass.
long	getVLSNSequence() Called by CursorImpl to get the record version.
void	setVLSNSequence(long seq) Called by LogManager after writing an LN with a newly assigned VLSN, and called by LNLogEntry after reading the LN with the VLSN from the log entry header.

Methods inherited from class com.sleepycat.je.tree.LN

addExtraMarshaledMemorySize, beginTag, clearDirty, copyEntryData, delete, dumpKey, dumpLog, dumpLogAdditional, dumpString, endTag, getData, getEmbeddedLoggables, getFetchedCold, getGenericLogType, getLastFormatChange, getLogSize, getLogSize, getLogType, hasReplicationFormat, isDeleted, isDirty, isLN, isReplicationFormatWorthwhile, log, logicalEquals, makeLN, makeLN, modify, optionalLog, postFetchInit, readFromLog, resolvePartialEntry, setDirty, setEmpty, setEntry, setEntry, setEntry, setFetchedCold, writeToLog, writeToLog

Methods inherited from class com.sleepycat.je.tree.Node

containsDuplicates, dump, getLevel, getTransactionId, getType, isBIN, isBINDelta, isBINDelta, isDBIN, isDIN, isIN, isUpperIN, latch, latchShared, latchShared, releaseLatch, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.sleepycat.je.log.Loggable

getTransactionId

Constructor Detail

VersionedLN

public VersionedLN()

VersionedLN

public VersionedLN(SizeofMarker marker,
                   DatabaseEntry dbt)

For Sizeof.

Method Detail

getVLSNSequence

public long getVLSNSequence()

Description copied from class: LN

Called by CursorImpl to get the record version. If VLSNs are not preserved for this environment, returns -1 which is the sequence for VLSN.NULL_VLSN. If VLSNs are preserved for this environment, this method is overridden by VersionedLN which returns the VLSN sequence.

Overrides:

getVLSNSequence in class LN

setVLSNSequence

public void setVLSNSequence(long seq)

Description copied from class: LN

Called by LogManager after writing an LN with a newly assigned VLSN, and called by LNLogEntry after reading the LN with the VLSN from the log entry header. If VLSNs are not preserved for this environment, does nothing. If VLSNs are preserved for this environment, this method is overridden by VersionedLN which stores the VLSN sequence.

Overrides:

setVLSNSequence in class LN

getMemorySizeIncludedByParent

public long getMemorySizeIncludedByParent()

Add additional size taken by this LN subclass.

Overrides:

getMemorySizeIncludedByParent in class LN