org.neodatis.odb.impl.core.btree

Class LazyODBBTreePersister

java.lang.Object

org.neodatis.odb.impl.core.btree.LazyODBBTreePersister

All Implemented Interfaces:

IBTreePersister, ICommitListener

public class LazyODBBTreePersister
extends java.lang.Object
implements IBTreePersister, ICommitListener

Class that persists the BTree and its node into the NeoDatis ODB Database.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	LOG_ID
static int	nbLoadNodes
static int	nbLoadNodesFromCache
static int	nbLoadTree
static int	nbSaveNodes
static int	nbSaveNodesInCache
static int	nbSaveTree

Constructor Summary

Constructors

Constructor and Description
LazyODBBTreePersister(IStorageEngine engine)
LazyODBBTreePersister(ODB odb)

Method Summary

Modifier and Type	Method and Description
void	afterCommit()
void	beforeCommit()
void	clear()
void	clearModified()
void	close()
static java.lang.StringBuffer	counters()
java.lang.Object	deleteNode(IBTreeNode o)
void	flush()
OID	getNextNodeId()
IBTree	loadBTree(java.lang.Object id)
IBTreeNode	loadNodeById(java.lang.Object id) Loads a node from its id.
void	persist()
static void	resetCounters()
OID	saveBTree(IBTree treeToSave)
java.lang.Object	saveNode(IBTreeNode node) saves the bree node Only puts the current node in an 'modified Node' map to be saved on commit
void	setBTree(IBTree tree)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LOG_ID

public static final java.lang.String LOG_ID

See Also:

Constant Field Values

nbSaveNodes

public static int nbSaveNodes

nbSaveNodesInCache

public static int nbSaveNodesInCache

nbSaveTree

public static int nbSaveTree

nbLoadNodes

public static int nbLoadNodes

nbLoadTree

public static int nbLoadTree

nbLoadNodesFromCache

public static int nbLoadNodesFromCache

Constructor Detail

LazyODBBTreePersister

public LazyODBBTreePersister(ODB odb)

LazyODBBTreePersister

public LazyODBBTreePersister(IStorageEngine engine)

Method Detail

loadNodeById

public IBTreeNode loadNodeById(java.lang.Object id)

Loads a node from its id. Tries to get if from memory, if not present then loads it from odb storage

Specified by:

loadNodeById in interface IBTreePersister

Parameters:

id - The id of the nod

Returns:

The node with the specific id

saveNode

public java.lang.Object saveNode(IBTreeNode node)

saves the bree node Only puts the current node in an 'modified Node' map to be saved on commit

Specified by:

saveNode in interface IBTreePersister

close

public void close()
           throws java.lang.Exception

Specified by:

close in interface IBTreePersister

Throws:

java.lang.Exception

loadBTree

public IBTree loadBTree(java.lang.Object id)

Specified by:

loadBTree in interface IBTreePersister

saveBTree

public OID saveBTree(IBTree treeToSave)

Specified by:

saveBTree in interface IBTreePersister

getNextNodeId

public OID getNextNodeId()
                  throws java.io.IOException

Throws:

java.io.IOException

persist

public void persist()

afterCommit

public void afterCommit()

Specified by:

afterCommit in interface ICommitListener

beforeCommit

public void beforeCommit()

Specified by:

beforeCommit in interface ICommitListener

deleteNode

public java.lang.Object deleteNode(IBTreeNode o)

Specified by:

deleteNode in interface IBTreePersister

setBTree

public void setBTree(IBTree tree)

Specified by:

setBTree in interface IBTreePersister

resetCounters

public static void resetCounters()

counters

public static java.lang.StringBuffer counters()

clear

public void clear()

Specified by:

clear in interface IBTreePersister

clearModified

public void clearModified()

flush

public void flush()

Specified by:

flush in interface IBTreePersister