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org.hsqldb
Class ReverseTextCache  

java.lang.Object
  org.hsqldb.Cache
      org.hsqldb.TextCache
          org.hsqldb.ReverseTextCache

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class ReverseTextCache

extends TextCache

Cache class declaration

The cache class implements the handling of reversed text table caches.

Version:

1.7.0

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Field Summary
protected  int	iFreePos
protected  java.lang.String	ignoredFirst
protected  boolean	ignoreFirst
protected  TextDatabaseRowInput	in
static java.lang.String	NL
protected  boolean	readOnly
protected  DatabaseFile	rFile
protected  java.lang.String	sName

 

Constructor Summary
(package private)	ReverseTextCache(java.lang.String name, java.lang.String propPrefix, HsqlDatabaseProperties props)           The cache constructor sets up the initial parameters of the cache object, setting the name used for the file, etc.

 

Method Summary
(package private)  void	add(CachedRow r)           Adds a Row to the Cache.
(package private)  void	cleanUp()           Cleans up this Cache object.
(package private)  void	closeFile()           Closes this object's database file without flushing pending writes.
(package private)  void	flush()           The flush method saves all cached data to the file, saves the free position and closes the file.
(package private)  void	free(CachedRow r)           Marks space in this object's cache file as free.
(package private)  int	getFreePos()           Getter for iFreePos member
(package private)  CachedRow	getRow(int pos, Table t)           Reads a Row object from this Cache that corresponds to the (pos) file offset in .data file.
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.
(package private)  void	open(boolean readonly)           The open method creates or opens a database file.
(package private)  void	purge()
protected  void	remove(CachedRow r)           Removes a Row from this Cache object.
(package private)  void	reopen()
protected  void	saveAll()           Writes out all 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

NL

public static final java.lang.String NL

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readOnly

protected boolean readOnly

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in

protected TextDatabaseRowInput in

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ignoreFirst

protected boolean ignoreFirst

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ignoredFirst

protected java.lang.String ignoredFirst

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sName

protected java.lang.String sName

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iFreePos

protected int iFreePos

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rFile

protected DatabaseFile rFile

Constructor Detail

ReverseTextCache

ReverseTextCache(java.lang.String name,
                 java.lang.String propPrefix,
                 HsqlDatabaseProperties props)
           throws java.sql.SQLException

The cache constructor sets up the initial parameters of the cache object, setting the name used for the file, etc.

Method Detail

open

void open(boolean readonly)
    throws java.sql.SQLException

The open method creates or opens a database file.

Overrides:

open in class TextCache

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flush

void flush()
     throws java.sql.SQLException

The flush method saves all cached data to the file, saves the free position and closes the file.

Overrides:

flush in class TextCache

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purge

void purge()
     throws java.sql.SQLException

Overrides:

purge in class TextCache

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makeRow

protected CachedRow makeRow(int pos,
                            Table t)
                     throws java.sql.SQLException

Description copied from class: Cache

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

Overrides:

makeRow in class TextCache

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reopen

void reopen()
      throws java.sql.SQLException

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free

void free(CachedRow r)
    throws java.sql.SQLException

Description copied from class: Cache

Marks space in this object's cache file as free.

Note: If there exists more than MAX_FREE_COUNT free positions, then they are probably all too small, so we start a new list.

todo: This is wrong when deleting lots of records

Overrides:

free in class Cache

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setStorageSize

protected void setStorageSize(CachedRow r)
                       throws java.sql.SQLException

Description copied from class: Cache

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

Overrides:

setStorageSize in class Cache

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saveRow

protected void saveRow(CachedRow r)
                throws java.io.IOException,
                       java.sql.SQLException

Description copied from class: Cache

Writes out the specified Row.

Overrides:

saveRow in class Cache

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closeFile

void closeFile()
         throws java.sql.SQLException

Closes this object's database file without flushing pending writes.

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add

void add(CachedRow r)
   throws java.sql.SQLException

Adds a Row to the Cache.

A Row is added by walking the list of CacheFree objects to see if there is available space to store it, reusing space if it exists. Otherwise , this object's cache file is grown to accomadate it.

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getRow

CachedRow getRow(int pos,
                 Table t)
           throws java.sql.SQLException

Reads a Row object from this Cache that corresponds to the (pos) file offset in .data file.

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cleanUp

void cleanUp()
       throws java.sql.SQLException

Cleans up this Cache object.

This method is called when this Cache object grows too large.

Cleanup is done by checking the iLastAccess member of this object's in-memory Rows and removing those that have been least recently accessed (classic LRU algoritm).

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remove

protected void remove(CachedRow r)
               throws java.sql.SQLException

Removes a Row from this Cache object. Note: This method is called by the cleanUp method.

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saveAll

protected void saveAll()
                throws java.sql.SQLException

Writes out all cached Rows.

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getFreePos

int getFreePos()

Getter for iFreePos member

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Home >> All >> org >> [ hsqldb overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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