info.aduna.gee.publication.servlets.util
Class ExpiringCache

java.lang.Object
  info.aduna.gee.publication.servlets.util.ExpiringCache

public class ExpiringCache
extends Object

A cache of key-value pairs in which a "put" value is valid only for maximum time-to-live (ttl). There is no "containsKey" method in order to avoid timing problems. Just "get" and check.

Nested Class Summary

class

ExpiringCache.TimedValue To store the original "value" plus its "time" in a Hashtable we have to combine these two.

Field Summary

protected Vector	_sequence
protected int	_size
protected Hashtable	_timedValues
protected int	_ttl

Constructor Summary

ExpiringCache(int size, int ttl)

Method Summary

Object	get(Object key)
void	put(Object key, Object value)
void	remove(Object key)

Methods inherited from class java.lang.Object

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

Field Detail

_sequence

protected Vector _sequence

_timedValues

protected Hashtable _timedValues

_size

protected int _size

_ttl

protected int _ttl

Constructor Detail

ExpiringCache

public ExpiringCache(int size,
                     int ttl)

Parameters:

size - The maximum amount of objects in the cache or infinit if less than or equal to 0.

ttl - The maximum time to live of objects in the cache or infinit if less than or equal to 0.

Method Detail

put

public void put(Object key,
                Object value)

get

public Object get(Object key)

remove

public void remove(Object key)