scone.netobjects
Class CacheTable

java.lang.Object
  scone.netobjects.CacheTable

public class CacheTable
extends java.lang.Object

A CacheTable is used to cache the entries of the database.

Author:

Harald Weinreich, Volkert Buchmann

Field Summary

protected java.lang.String	cacheName
protected scone.netobjects.CacheTable.Cleaner	cleaner
static boolean	DEBUG
static int	EAGERGC
protected java.util.Hashtable[]	entities
protected int	gcType
static int	LAZYGC
protected java.lang.Object	lock
protected int	noOfKeys
protected int	timeTillCleanUp

Constructor Summary

CacheTable(java.lang.String cacheName, int noOfKeys, int timeTillCleanUp, int gcType)
Create a new CacheTable with noOfKeys HashTables to access Data.

CacheTable(java.lang.String cacheName, int noOfKeys, int timeTillCleanUp, int gcType, int capacity)
Create a new CacheTable with noOfKeys HashTables to access Data.

Method Summary

void	clean() Clean is called to store all elements of the cache to the database.
Cacheable	get(int keyNo, java.lang.Object key) get an Object from the Cache
void	put(Cacheable entity) Put an entity into CacheTable
void	shutdown()

Methods inherited from class java.lang.Object

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

Field Detail

LAZYGC

public static final int LAZYGC

See Also:

Constant Field Values

EAGERGC

public static final int EAGERGC

See Also:

Constant Field Values

DEBUG

public static final boolean DEBUG

See Also:

Constant Field Values

cacheName

protected java.lang.String cacheName

lock

protected java.lang.Object lock

entities

protected java.util.Hashtable[] entities

noOfKeys

protected int noOfKeys

gcType

protected int gcType

timeTillCleanUp

protected int timeTillCleanUp

cleaner

protected scone.netobjects.CacheTable.Cleaner cleaner

Constructor Detail

CacheTable

public CacheTable(java.lang.String cacheName,
                  int noOfKeys,
                  int timeTillCleanUp,
                  int gcType)

Create a new CacheTable with noOfKeys HashTables to access Data. Default capacity is 5000 Objects.

Parameters:

cacheName - name of the cache, i.e., cached objects.

noOfKeys - how many keys are

timeTillCleanUp - time between storing cache data

int - gcType this value is either LAZYGC: objects are removed if memory runs out or with EAGERGC as soon as possible

CacheTable

public CacheTable(java.lang.String cacheName,
                  int noOfKeys,
                  int timeTillCleanUp,
                  int gcType,
                  int capacity)

Create a new CacheTable with noOfKeys HashTables to access Data.

Parameters:

cacheName - name of the cache, i.e., cached objects.

noOfKeys - how many keys are

timeTillCleanUp - time between storing cache data

int - gcType this value is either LAZYGC: objects are removed if memory runs out or with EAGERGC as soon as possible

int - capacity initial capacity of cache for this type of objects...

Method Detail

shutdown

public void shutdown()

put

public void put(Cacheable entity)

Put an entity into CacheTable

Parameters:

entity - the object to be saved in cache.

get

public Cacheable get(int keyNo,
                     java.lang.Object key)

get an Object from the Cache

Parameters:

keyNo - the number of the key to acces the entry

key - the key associated with the object.

clean

public void clean()

Clean is called to store all elements of the cache to the database.