com.sleepycat.je.tree

Class Node

java.lang.Object

com.sleepycat.je.tree.Node

All Implemented Interfaces:

Loggable

Direct Known Subclasses:

IN, LN

public abstract class Node
extends Object
implements Loggable

A Node contains all the common base information for any JE B-Tree node.

Field Summary

Fields

Modifier and Type	Field and Description
static long	NULL_NODE_ID

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Node()

Method Summary

Modifier and Type	Method and Description
boolean	containsDuplicates() Since DIN/DBIN/DupCountLN are no longer used in the Btree, this method should normally only be used by dup conversion or entities that do not access records via the Btree.
void	dump(int nSpaces)
abstract LogEntryType	getGenericLogType() Returns the generic LogEntryType for this node.
int	getLevel() Cover for LN's and just return 0 since they'll always be at the bottom of the tree.
long	getMemorySizeIncludedByParent() Return the approximate size of this node in memory, if this size should be included in its parents memory accounting.
long	getTransactionId()
String	getType()
boolean	isBIN()
boolean	isBINDelta()
boolean	isBINDelta(boolean checkLatched)
boolean	isDBIN()
boolean	isDIN()
boolean	isIN()
boolean	isLN()
boolean	isUpperIN()
void	latch()
void	latchShared()
void	latchShared(CacheMode ignore)
void	postFetchInit(DatabaseImpl db, long sourceLsn) Initialize a node that has been faulted in from the log.
void	releaseLatch()
String	toString() Default toString method at the root of the tree.

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

dumpLog, getLogSize, logicalEquals, readFromLog, writeToLog

Field Detail

NULL_NODE_ID

public static final long NULL_NODE_ID

See Also:

Constant Field Values

Constructor Detail

Node

protected Node()

Method Detail

postFetchInit

public void postFetchInit(DatabaseImpl db,
                          long sourceLsn)
                   throws DatabaseException

Initialize a node that has been faulted in from the log.

Throws:

DatabaseException

latch

public void latch()

latchShared

public void latchShared()
                 throws DatabaseException

Throws:

DatabaseException

latchShared

public void latchShared(CacheMode ignore)
                 throws DatabaseException

Throws:

DatabaseException

releaseLatch

public void releaseLatch()

containsDuplicates

public boolean containsDuplicates()

Since DIN/DBIN/DupCountLN are no longer used in the Btree, this method should normally only be used by dup conversion or entities that do not access records via the Btree.

Returns:

true if this node is a duplicate-bearing node type, false if otherwise.

getLevel

public int getLevel()

Cover for LN's and just return 0 since they'll always be at the bottom of the tree.

isLN

public boolean isLN()

isIN

public boolean isIN()

isUpperIN

public boolean isUpperIN()

isBIN

public boolean isBIN()

isBINDelta

public boolean isBINDelta()

isBINDelta

public boolean isBINDelta(boolean checkLatched)

isDIN

public boolean isDIN()

isDBIN

public boolean isDBIN()

getMemorySizeIncludedByParent

public long getMemorySizeIncludedByParent()

Return the approximate size of this node in memory, if this size should be included in its parents memory accounting. For example, all INs return 0, because they are accounted for individually. LNs must return a count, they're not counted on the INList.

toString

public String toString()

Default toString method at the root of the tree.

Overrides:

toString in class Object

dump

public void dump(int nSpaces)

getType

public String getType()

getGenericLogType

public abstract LogEntryType getGenericLogType()

Returns the generic LogEntryType for this node. Returning the actual type used to log the node is not always possible. Specifically, for LN nodes the generic type is less specific than the actual type used to log the node: + A non-transactional type is always returned. + LOG_INS_LN is returned rather than LOG_UPD_LN. + LOG_DEL_LN is returned rather than LOG_DEL_DUPLN.

getTransactionId

public long getTransactionId()

Specified by:

getTransactionId in interface Loggable

Returns:

the transaction id embedded within this loggable object. Objects that have no transaction id should return 0.