org.hsqldb

Class RowAVLDisk

java.lang.Object

org.hsqldb.Row

org.hsqldb.RowAVL

org.hsqldb.RowAVLDisk

All Implemented Interfaces:

CachedObject

Direct Known Subclasses:

RowAVLDiskLarge, RowDiskDataChange

public class RowAVLDisk
extends RowAVL

In-memory representation of a disk-based database row object with methods for serialization and de-serialization.

New class derived from Hypersonic SQL code and enhanced in HSQLDB.

Since:

Hypersonic SQL

Field Summary

Fields

Modifier and Type	Field and Description
static int	NO_POS

Fields inherited from class org.hsqldb.RowAVL

nPrimaryNode

Fields inherited from class org.hsqldb.Row

rowAction

Fields inherited from interface org.hsqldb.persist.CachedObject

emptyArray

Constructor Summary

Constructors

Constructor and Description
RowAVLDisk(TableBase t, java.lang.Object[] o, PersistentStore store) Constructor for new Rows.
RowAVLDisk(TableBase t, RowInputInterface in) Constructor when read from the disk into the Cache.

Method Summary

Modifier and Type	Method and Description
void	delete(PersistentStore store) Only unlinks nodes.
void	destroy() Helps GC, removing secondary node links.
int	getAccessCount()
int	getRealSize(RowOutputInterface out)
int	getStorageSize()
TableBase	getTable() Returns the Table to which this Row belongs.
boolean	hasChanged() Returns true if Node data has changed.
NodeAVL	insertNode(int index)
boolean	isInMemory()
boolean	isKeepInMemory() Returns true if any of the Nodes for this row is a root node.
boolean	isMemory()
boolean	isNew()
boolean	keepInMemory(boolean keep)
void	setChanged(boolean changed) Sets flag for row data change.
void	setInMemory(boolean in)
void	setNewNodes(PersistentStore store)
void	setNodesChanged() Sets flag for Node data change.
void	setPos(long pos) Sets the file position for the row
void	setStorageSize(int size)
void	updateAccessCount(int count)
void	write(RowOutputInterface out) Used exclusively by Cache to save the row to disk.
void	write(RowOutputInterface out, LongLookup lookup)

Methods inherited from class org.hsqldb.RowAVL

clearNonPrimaryNodes, getNode, restore

Methods inherited from class org.hsqldb.Row

equals, getAction, getData, getDefaultCapacity, getId, getPos, hashCode, isBlock, read

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

NO_POS

public static final int NO_POS

See Also:

Constant Field Values

Constructor Detail

RowAVLDisk

public RowAVLDisk(TableBase t,
                  java.lang.Object[] o,
                  PersistentStore store)

Constructor for new Rows. Variable hasDataChanged is set to true in order to indicate the data needs saving.

Parameters:

t - table

o - row data

RowAVLDisk

public RowAVLDisk(TableBase t,
                  RowInputInterface in)
           throws java.io.IOException

Constructor when read from the disk into the Cache.

Parameters:

t - table

in - data source

Throws:

java.io.IOException

Method Detail

insertNode

public NodeAVL insertNode(int index)

Overrides:

insertNode in class RowAVL

setNodesChanged

public void setNodesChanged()

Sets flag for Node data change.

updateAccessCount

public void updateAccessCount(int count)

Specified by:

updateAccessCount in interface CachedObject

Overrides:

updateAccessCount in class Row

getAccessCount

public int getAccessCount()

Specified by:

getAccessCount in interface CachedObject

Overrides:

getAccessCount in class Row

getStorageSize

public int getStorageSize()

Specified by:

getStorageSize in interface CachedObject

Overrides:

getStorageSize in class Row

isMemory

public boolean isMemory()

Specified by:

isMemory in interface CachedObject

Overrides:

isMemory in class Row

setPos

public void setPos(long pos)

Sets the file position for the row

Specified by:

setPos in interface CachedObject

Overrides:

setPos in class Row

Parameters:

pos - position in data file

setChanged

public void setChanged(boolean changed)

Sets flag for row data change.

Overrides:

setChanged in class Row

isNew

public boolean isNew()

Specified by:

isNew in interface CachedObject

Overrides:

isNew in class Row

hasChanged

public boolean hasChanged()

Returns true if Node data has changed.

Specified by:

hasChanged in interface CachedObject

Overrides:

hasChanged in class Row

Returns:

boolean

getTable

public TableBase getTable()

Returns the Table to which this Row belongs.

Overrides:

getTable in class Row

Returns:

Table

setStorageSize

public void setStorageSize(int size)

Specified by:

setStorageSize in interface CachedObject

Overrides:

setStorageSize in class Row

isKeepInMemory

public boolean isKeepInMemory()

Returns true if any of the Nodes for this row is a root node. Used only in Cache.java to avoid removing the row from the cache.

Specified by:

isKeepInMemory in interface CachedObject

Overrides:

isKeepInMemory in class Row

Returns:

boolean

delete

public void delete(PersistentStore store)

Only unlinks nodes. Is not a destroy() method

Overrides:

delete in class RowAVL

destroy

public void destroy()

Description copied from class: RowAVL

Helps GC, removing secondary node links. Keeps primary index links to allow iteration.

Specified by:

destroy in interface CachedObject

Overrides:

destroy in class RowAVL

keepInMemory

public boolean keepInMemory(boolean keep)

Specified by:

keepInMemory in interface CachedObject

Overrides:

keepInMemory in class Row

isInMemory

public boolean isInMemory()

Specified by:

isInMemory in interface CachedObject

Overrides:

isInMemory in class Row

setInMemory

public void setInMemory(boolean in)

Specified by:

setInMemory in interface CachedObject

Overrides:

setInMemory in class Row

setNewNodes

public void setNewNodes(PersistentStore store)

Overrides:

setNewNodes in class RowAVL

getRealSize

public int getRealSize(RowOutputInterface out)

Specified by:

getRealSize in interface CachedObject

Overrides:

getRealSize in class Row

write

public void write(RowOutputInterface out)

Used exclusively by Cache to save the row to disk. New implementation in 1.7.2 writes out only the Node data if the table row data has not changed. This situation accounts for the majority of invocations as for each row deleted or inserted, the Nodes for several other rows will change.

Specified by:

write in interface CachedObject

Overrides:

write in class Row

write

public void write(RowOutputInterface out,
                  LongLookup lookup)

Specified by:

write in interface CachedObject

Overrides:

write in class Row