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 java.lang.Object
implements Loggable

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

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Node() Only for subclasses.
protected	Node(EnvironmentImpl envImpl, boolean replicated) Create a new node, assigning it the next available node id.

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract boolean	canBeAncestor(boolean targetContainsDuplicates)
boolean	containsDuplicates()
void	dump(int nSpaces)
void	dumpLog(java.lang.StringBuffer sb, boolean verbose) Write the object into the string buffer for log dumping.
int	getLevel() Cover for LN's and just return 0 since they'll always be at the bottom of the tree.
int	getLogSize()
abstract LogEntryType	getLogType()
protected long	getMemorySizeIncludedByParent() Return the approximate size of this node in memory, if this size should be included in it's parents memory accounting.
long	getNodeId()
long	getTransactionId()
java.lang.String	getType()
protected abstract boolean	isSoughtNode(long nid, CacheMode cacheMode)
void	latchShared()
void	latchShared(CacheMode ignore)
void	postFetchInit(DatabaseImpl db, long sourceLsn) Initialize a node that has been faulted in from the log.
void	readFromLog(java.nio.ByteBuffer itemBuffer, byte entryVersion) Initialize this object from the data in itemBuf.
void	releaseLatch()
java.lang.String	shortDescription()
java.lang.String	toString() Default toString method at the root of the tree.
void	verify(byte[] maxKey)
void	writeToLog(java.nio.ByteBuffer logBuffer) Serialize this object into the buffer.

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

logicalEquals

Constructor Detail

Node

protected Node()

Only for subclasses.

Node

protected Node(EnvironmentImpl envImpl,
    boolean replicated)

Create a new node, assigning it the next available node id.

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

getNodeId

public long getNodeId()

latchShared

public void latchShared()
                 throws DatabaseException

Throws:

DatabaseException

latchShared

public void latchShared(CacheMode ignore)
                 throws DatabaseException

Throws:

DatabaseException

releaseLatch

public void releaseLatch()
                  throws LatchNotHeldException

Throws:

LatchNotHeldException

verify

public void verify(byte[] maxKey)
            throws DatabaseException

Throws:

DatabaseException

containsDuplicates

public boolean containsDuplicates()

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.

isSoughtNode

protected abstract boolean isSoughtNode(long nid,
                   CacheMode cacheMode)
                                 throws DatabaseException

Returns:

true if you're an IN in the search path

Throws:

DatabaseException

canBeAncestor

protected abstract boolean canBeAncestor(boolean targetContainsDuplicates)

Returns:

true if you can be the ancestor of the target IN. Currently the determining factor is whether the target IN contains duplicates.

getMemorySizeIncludedByParent

protected long getMemorySizeIncludedByParent()

Return the approximate size of this node in memory, if this size should be included in it's 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 java.lang.String toString()

Default toString method at the root of the tree.

Overrides:

toString in class java.lang.Object

dump

public void dump(int nSpaces)

shortDescription

public java.lang.String shortDescription()

getType

public java.lang.String getType()

getLogType

public abstract LogEntryType getLogType()

getLogSize

public int getLogSize()

Specified by:

getLogSize in interface Loggable

Returns:

number of bytes used to store this object.

See Also:

Loggable.getLogSize()

writeToLog

public void writeToLog(java.nio.ByteBuffer logBuffer)

Description copied from interface: Loggable

Serialize this object into the buffer.

Specified by:

writeToLog in interface Loggable

Parameters:

logBuffer - is the destination buffer

See Also:

Loggable.writeToLog(java.nio.ByteBuffer)

readFromLog

public void readFromLog(java.nio.ByteBuffer itemBuffer,
               byte entryVersion)
                 throws LogException

Description copied from interface: Loggable

Initialize this object from the data in itemBuf.

Specified by:

readFromLog in interface Loggable

Throws:

LogException

See Also:

Loggable.readFromLog(java.nio.ByteBuffer, byte)

dumpLog

public void dumpLog(java.lang.StringBuffer sb,
           boolean verbose)

Description copied from interface: Loggable

Write the object into the string buffer for log dumping. Each object should be dumped without indentation or new lines and should be valid XML.

Specified by:

dumpLog in interface Loggable

Parameters:

sb - destination string buffer

verbose - if true, dump the full, verbose version

See Also:

Loggable.dumpLog(java.lang.StringBuffer, boolean)

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.

See Also:

Loggable.getTransactionId()