scone.netobjects
Class HtmlNodeCache

java.lang.Object
  java.util.Observable
      scone.netobjects.HtmlNodeCache

All Implemented Interfaces:

TableRecordCacheInterface

public class HtmlNodeCache
extends java.util.Observable
implements TableRecordCacheInterface

caches all HtmlNode objects.
use the static methods provided by this class to obtain HtmlNode objects.

Author:

Harald Weinreich, Volkert Buchmann

Field Summary

protected static CacheTable	cache
protected java.util.Vector	items
protected static java.lang.Object	lock
protected static HtmlNodeCache	observable
protected static int	observePeriod

Constructor Summary

HtmlNodeCache()

Method Summary

protected void	addItem(java.lang.Object o)
static HtmlNode	check(NetNode node) This method will return the required HtmlNode if it exists in the database, and null otherwise.
static HtmlNode	check(NetNode node, boolean persistent) This method will return the required HtmlNode if it exists in the database, and null otherwise.
static void	clean() Store objects to DB
static HtmlNode	get(NetNode node) This methid will return and potentially create the required HtmlNode.
static HtmlNode	get(NetNode node, boolean persistent) This method will return and potentially create the required HtmlNode.
static int	getHtmlNodeCount(java.lang.String sqlClause) This method returns a number of HtmoNodes to a given query string.
static int	getObservePeriod()
static void	init(int timeTillCleanUp, int gcType)
void	notifyObservers()
static void	putObserver(java.util.Observer o)
static void	removeObserver(java.util.Observer o)
static void	setObservePeriod(int period)

Methods inherited from class java.util.Observable

addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, setChanged

Methods inherited from class java.lang.Object

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

Field Detail

observable

protected static HtmlNodeCache observable

observePeriod

protected static int observePeriod

cache

protected static CacheTable cache

lock

protected static java.lang.Object lock

items

protected java.util.Vector items

Constructor Detail

HtmlNodeCache

public HtmlNodeCache()

Method Detail

init

public static void init(int timeTillCleanUp,
                        int gcType)

setObservePeriod

public static void setObservePeriod(int period)

getObservePeriod

public static int getObservePeriod()

putObserver

public static void putObserver(java.util.Observer o)

removeObserver

public static void removeObserver(java.util.Observer o)

check

public static HtmlNode check(NetNode node)

This method will return the required HtmlNode if it exists in the database, and null otherwise.

Parameters:

node - the NetNode

Returns:

the HtmlNode corresponding to node or null

check

public static HtmlNode check(NetNode node,
                             boolean persistent)

This method will return the required HtmlNode if it exists in the database, and null otherwise.

Parameters:

netNode - the NetNode

persistent - shall the NetNode be made persistent?
true: yes, now,
false: no never.
For deferred DB persistency call get-method without boolean parameter.

get

public static HtmlNode get(NetNode node)

This methid will return and potentially create the required HtmlNode.
If it exists in the database it will return the stored data. If not, it will create a new set in the database

Parameters:

node - the NetNode

Returns:

the HtmlNode corresponding to node

get

public static HtmlNode get(NetNode node,
                           boolean persistent)

This method will return and potentially create the required HtmlNode.

Parameters:

netNode - the NetNode

persistent - shall the NetNode be made persistent?
true: yes, now,
false: no never.
For deferred DB persistency call get-method without boolean parameter.

getHtmlNodeCount

public static int getHtmlNodeCount(java.lang.String sqlClause)

This method returns a number of HtmoNodes to a given query string.

Parameters:

sqlClause - The where clause for the query string.

Returns:

The number of HtmlNodes.

clean

public static void clean()

Store objects to DB

addItem

protected void addItem(java.lang.Object o)

notifyObservers

public void notifyObservers()

Overrides:

notifyObservers in class java.util.Observable