org.hsqldb
Class DataFileCache

java.lang.Object
  org.hsqldb.Cache
      org.hsqldb.DataFileCache

Direct Known Subclasses:

TextCache

public class DataFileCache

extends org.hsqldb.Cache

Field Summary

protected int	cachedRowPadding
protected org.hsqldb.HsqlDatabaseProperties	dbProps
protected Database	dDatabase
protected int	iFreePos
protected org.hsqldb.ScaledRAFile	rFile
protected RowOutputInterface	rowOut
protected int	rowStoreExtra
protected String	sName
protected boolean	storeOnInsert

Method Summary

protected void	init() Structural initialisations take place here.
protected void	initBuffers()
protected void	initParams() initial external parameters are set here.
protected CachedRow	makeRow(int pos, Table t) Constructs a new Row for the specified table, using row data read at the specified position (pos) in this object's database file.
protected CachedRow	remove(CachedRow r) Removes a Row from this Cache object.
protected void	remove(Table t) Removes all Row objects for a table from this Cache object.
protected void	saveAll() Writes out all modified cached Rows.
protected void	saveRow(CachedRow r) Writes out the specified Row.
protected void	setStorageSize(CachedRow r) Calculates the number of bytes required to store a Row in this object's database file.

Methods inherited from class java.lang.Object

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

Field Detail

dDatabase

protected Database dDatabase

dbProps

protected org.hsqldb.HsqlDatabaseProperties dbProps

sName

protected String sName

storeOnInsert

protected boolean storeOnInsert

cachedRowPadding

protected int cachedRowPadding

rowStoreExtra

protected int rowStoreExtra

rFile

protected org.hsqldb.ScaledRAFile rFile

iFreePos

protected int iFreePos

rowOut

protected RowOutputInterface rowOut

Method Detail

makeRow

protected CachedRow makeRow(int pos,
                            Table t)
                     throws HsqlException

Constructs a new Row for the specified table, using row data read at the specified position (pos) in this object's database file.

Throws:

HsqlException

saveRow

protected void saveRow(CachedRow r)
                throws IOException,
                       HsqlException

Writes out the specified Row. Will write only the Nodes or both Nodes and table row data depending on what is not already persisted to disk.

Throws:

IOException

HsqlException

setStorageSize

protected void setStorageSize(CachedRow r)
                       throws HsqlException

Calculates the number of bytes required to store a Row in this object's database file.

Throws:

HsqlException

initParams

protected void initParams()
                   throws HsqlException

initial external parameters are set here.

Throws:

HsqlException

init

protected void init()

Structural initialisations take place here. This allows the Cache to be resized while the database is in operation.

initBuffers

protected void initBuffers()
                    throws HsqlException

Throws:

HsqlException

remove

protected void remove(Table t)
               throws HsqlException

Removes all Row objects for a table from this Cache object. This is done when a table is dropped. Necessary because the Rows corresponding to index roots will never be removed otherwise. This doesn't add the Rows to the free list and does not by itself modify the *.data file.

Throws:

HsqlException

remove

protected CachedRow remove(CachedRow r)
                    throws HsqlException

Removes a Row from this Cache object. This is done when there is no room for extra rows to be read from the disk.

Throws:

HsqlException

saveAll

protected void saveAll()
                throws HsqlException

Writes out all modified cached Rows.

Throws:

HsqlException