org.pentaho.di.core

Class DBCache

java.lang.Object

org.pentaho.di.core.DBCache

public class DBCache
extends Object

This class caches database queries so that the same query doesn't get called twice. Queries are often launched to the databases to get information on tables etc.

Since:

15-01-04

Author:

Matt

Method Summary

Methods

Modifier and Type	Method and Description
void	clear(String dbname) Clear out all entries of database with a certain name
RowMetaInterface	get(DBCacheEntry entry) Get the fields as a row generated by a database cache entry
String	getFilename()
static DBCache	getInstance() Create the database cache instance by loading it from disk
boolean	isActive()
void	put(DBCacheEntry entry, RowMetaInterface fields)
void	saveCache()
void	setActive()
void	setActive(boolean act)
void	setInactive()
int	size()

Methods inherited from class java.lang.Object

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

Method Detail

setActive

public void setActive()

setInactive

public void setInactive()

setActive

public void setActive(boolean act)

isActive

public boolean isActive()

put

public void put(DBCacheEntry entry,
       RowMetaInterface fields)

get

public RowMetaInterface get(DBCacheEntry entry)

Get the fields as a row generated by a database cache entry

Parameters:

entry - the entry to look for

Returns:

the fields as a row generated by a database cache entry

size

public int size()

clear

public void clear(String dbname)

Clear out all entries of database with a certain name

Parameters:

dbname - The name of the database for which we want to clear the cache or null if we want to clear it all.

getFilename

public String getFilename()

saveCache

public void saveCache()
               throws KettleFileException

Throws:

KettleFileException

getInstance

public static final DBCache getInstance()

Create the database cache instance by loading it from disk

Returns:

the database cache instance.

Throws:

KettleFileException